1 /*********************************************************************** 2 * * 3 * This software is part of the ast package * 4 * Copyright (c) 1982-2008 AT&T Intellectual Property * 5 * and is licensed under the * 6 * Common Public License, Version 1.0 * 7 * by AT&T Intellectual Property * 8 * * 9 * A copy of the License is available at * 10 * http://www.opensource.org/licenses/cpl1.0.txt * 11 * (with md5 checksum 059e8cd6165cb4c31e351f2b69388fd9) * 12 * * 13 * Information and Software Systems Research * 14 * AT&T Research * 15 * Florham Park NJ * 16 * * 17 * David Korn <dgk@research.att.com> * 18 * * 19 ***********************************************************************/ 20 #pragma prototyped 21 /* 22 * UNIX shell parse tree executer 23 * 24 * David Korn 25 * AT&T Labs 26 * 27 */ 28 29 #include "defs.h" 30 #include <fcin.h> 31 #include "variables.h" 32 #include "path.h" 33 #include "name.h" 34 #include "io.h" 35 #include "shnodes.h" 36 #include "jobs.h" 37 #include "test.h" 38 #include "builtins.h" 39 #include "FEATURE/time" 40 #include "FEATURE/externs" 41 #include "FEATURE/locale" 42 #include "streval.h" 43 44 #if !_std_malloc 45 # include <vmalloc.h> 46 #endif 47 48 #if _lib_vfork 49 # include <ast_vfork.h> 50 #else 51 # define vfork() fork() 52 #endif 53 54 #define SH_NTFORK SH_TIMING 55 56 #if _lib_nice 57 extern int nice(int); 58 #endif /* _lib_nice */ 59 #if !_lib_spawnveg 60 # define spawnveg(a,b,c,d) spawnve(a,b,c) 61 #endif /* !_lib_spawnveg */ 62 #if SHOPT_SPAWN 63 static pid_t sh_ntfork(Shell_t*,const Shnode_t*,char*[],int*,int); 64 #endif /* SHOPT_SPAWN */ 65 66 static void sh_funct(Shell_t *,Namval_t*, int, char*[], struct argnod*,int); 67 static int trim_eq(const char*, const char*); 68 static void coproc_init(Shell_t*, int pipes[]); 69 70 static void *timeout; 71 static char pipejob; 72 73 struct funenv 74 { 75 Namval_t *node; 76 struct argnod *env; 77 }; 78 79 /* ======== command execution ========*/ 80 81 /* 82 * print time <t> in h:m:s format with precision <p> 83 */ 84 static void l_time(Sfio_t *outfile,register clock_t t,int p) 85 { 86 register int min, sec, frac; 87 register int hr; 88 if(p) 89 { 90 frac = t%sh.lim.clk_tck; 91 frac = (frac*100)/sh.lim.clk_tck; 92 } 93 t /= sh.lim.clk_tck; 94 sec = t%60; 95 t /= 60; 96 min = t%60; 97 if(hr=t/60) 98 sfprintf(outfile,"%dh",hr); 99 if(p) 100 sfprintf(outfile,"%dm%d%c%0*ds",min,sec,GETDECIMAL(0),p,frac); 101 else 102 sfprintf(outfile,"%dm%ds",min,sec); 103 } 104 105 static int p_time(Shell_t *shp, Sfio_t *out, const char *format, clock_t *tm) 106 { 107 int c,p,l,n,offset = staktell(); 108 const char *first; 109 double d; 110 Stk_t *stkp = shp->stk; 111 for(first=format ; c= *format; format++) 112 { 113 if(c!='%') 114 continue; 115 sfwrite(stkp, first, format-first); 116 n = l = 0; 117 p = 3; 118 if((c= *++format) == '%') 119 { 120 first = format; 121 continue; 122 } 123 if(c>='0' && c <='9') 124 { 125 p = (c>'3')?3:(c-'0'); 126 c = *++format; 127 } 128 else if(c=='P') 129 { 130 if(d=tm[0]) 131 d = 100.*(((double)(tm[1]+tm[2]))/d); 132 p = 2; 133 goto skip; 134 } 135 if(c=='l') 136 { 137 l = 1; 138 c = *++format; 139 } 140 if(c=='U') 141 n = 1; 142 else if(c=='S') 143 n = 2; 144 else if(c!='R') 145 { 146 stkseek(stkp,offset); 147 errormsg(SH_DICT,ERROR_exit(0),e_badtformat,c); 148 return(0); 149 } 150 d = (double)tm[n]/sh.lim.clk_tck; 151 skip: 152 if(l) 153 l_time(stkp, tm[n], p); 154 else 155 sfprintf(stkp,"%.*f",p, d); 156 first = format+1; 157 } 158 if(format>first) 159 sfwrite(stkp,first, format-first); 160 sfputc(stkp,'\n'); 161 n = stktell(stkp)-offset; 162 sfwrite(out,stkptr(stkp,offset),n); 163 stkseek(stkp,offset); 164 return(n); 165 } 166 167 #if SHOPT_OPTIMIZE 168 /* 169 * clear argument pointers that point into the stack 170 */ 171 static int p_arg(struct argnod*,int); 172 static int p_switch(struct regnod*); 173 static int p_comarg(register struct comnod *com) 174 { 175 Namval_t *np=com->comnamp; 176 int n = p_arg(com->comset,ARG_ASSIGN); 177 if(com->comarg && (com->comtyp&COMSCAN)) 178 n+= p_arg(com->comarg,0); 179 if(com->comstate && np) 180 { 181 /* call builtin to cleanup state */ 182 Shbltin_t *bp = &sh.bltindata; 183 void *save_ptr = bp->ptr; 184 void *save_data = bp->data; 185 bp->bnode = np; 186 bp->vnode = com->comnamq; 187 bp->ptr = nv_context(np); 188 bp->data = com->comstate; 189 bp->flags = SH_END_OPTIM; 190 (*funptr(np))(0,(char**)0, bp); 191 bp->ptr = save_ptr; 192 bp->data = save_data; 193 } 194 com->comstate = 0; 195 if(com->comarg && !np) 196 n++; 197 return(n); 198 } 199 200 extern void sh_optclear(Shell_t*, void*); 201 202 static int sh_tclear(register Shnode_t *t) 203 { 204 int n=0; 205 if(!t) 206 return(0); 207 switch(t->tre.tretyp&COMMSK) 208 { 209 case TTIME: 210 case TPAR: 211 return(sh_tclear(t->par.partre)); 212 case TCOM: 213 return(p_comarg((struct comnod*)t)); 214 case TSETIO: 215 case TFORK: 216 return(sh_tclear(t->fork.forktre)); 217 case TIF: 218 n=sh_tclear(t->if_.iftre); 219 n+=sh_tclear(t->if_.thtre); 220 n+=sh_tclear(t->if_.eltre); 221 return(n); 222 case TWH: 223 if(t->wh.whinc) 224 n=sh_tclear((Shnode_t*)(t->wh.whinc)); 225 n+=sh_tclear(t->wh.whtre); 226 n+=sh_tclear(t->wh.dotre); 227 return(n); 228 case TLST: 229 case TAND: 230 case TORF: 231 case TFIL: 232 n=sh_tclear(t->lst.lstlef); 233 return(n+sh_tclear(t->lst.lstrit)); 234 case TARITH: 235 return(p_arg(t->ar.arexpr,ARG_ARITH)); 236 case TFOR: 237 n=sh_tclear(t->for_.fortre); 238 return(n+sh_tclear((Shnode_t*)t->for_.forlst)); 239 case TSW: 240 n=p_arg(t->sw.swarg,0); 241 return(n+p_switch(t->sw.swlst)); 242 case TFUN: 243 n=sh_tclear(t->funct.functtre); 244 return(n+sh_tclear((Shnode_t*)t->funct.functargs)); 245 case TTST: 246 if((t->tre.tretyp&TPAREN)==TPAREN) 247 return(sh_tclear(t->lst.lstlef)); 248 else 249 { 250 n=p_arg(&(t->lst.lstlef->arg),0); 251 if(t->tre.tretyp&TBINARY) 252 n+=p_arg(&(t->lst.lstrit->arg),0); 253 } 254 } 255 return(n); 256 } 257 258 static int p_arg(register struct argnod *arg,int flag) 259 { 260 while(arg) 261 { 262 if(strlen(arg->argval) || (arg->argflag==ARG_RAW)) 263 arg->argchn.ap = 0; 264 else if(flag==0) 265 sh_tclear((Shnode_t*)arg->argchn.ap); 266 else 267 sh_tclear(((struct fornod*)arg->argchn.ap)->fortre); 268 arg = arg->argnxt.ap; 269 } 270 return(0); 271 } 272 273 static int p_switch(register struct regnod *reg) 274 { 275 int n=0; 276 while(reg) 277 { 278 n+=p_arg(reg->regptr,0); 279 n+=sh_tclear(reg->regcom); 280 reg = reg->regnxt; 281 } 282 return(n); 283 } 284 # define OPTIMIZE_FLAG (ARG_OPTIMIZE) 285 # define OPTIMIZE (flags&OPTIMIZE_FLAG) 286 #else 287 # define OPTIMIZE_FLAG (0) 288 # define OPTIMIZE (0) 289 # define sh_tclear(x) 290 #endif /* SHOPT_OPTIMIZE */ 291 292 static void out_pattern(Sfio_t *iop, register const char *cp, int n) 293 { 294 register int c; 295 do 296 { 297 switch(c= *cp) 298 { 299 case 0: 300 if(n<0) 301 return; 302 c = n; 303 break; 304 case '\n': 305 sfputr(iop,"$'\\n",'\''); 306 continue; 307 case '\\': 308 if (!(c = *++cp)) 309 c = '\\'; 310 /*FALLTHROUGH*/ 311 case ' ': 312 case '<': case '>': case ';': 313 case '$': case '`': case '\t': 314 sfputc(iop,'\\'); 315 break; 316 } 317 sfputc(iop,c); 318 } 319 while(*cp++); 320 } 321 322 static void out_string(Sfio_t *iop, register const char *cp, int c, int quoted) 323 { 324 if(quoted) 325 { 326 int n = stktell(stkstd); 327 cp = sh_fmtq(cp); 328 if(iop==stkstd && cp==stkptr(stkstd,n)) 329 { 330 *stkptr(stkstd,stktell(stkstd)-1) = c; 331 return; 332 } 333 } 334 sfputr(iop,cp,c); 335 } 336 337 struct Level 338 { 339 Namfun_t hdr; 340 short maxlevel; 341 }; 342 343 /* 344 * this is for a debugger but it hasn't been tested yet 345 * if a debug script sets .sh.level it should set up the scope 346 * as if you were executing in that level 347 */ 348 static void put_level(Namval_t* np,const char *val,int flags,Namfun_t *fp) 349 { 350 Shscope_t *sp; 351 struct Level *lp = (struct Level*)fp; 352 int16_t level, oldlevel = (int16_t)nv_getnum(np); 353 nv_putv(np,val,flags,fp); 354 if(!val) 355 return; 356 level = nv_getnum(np); 357 if(level<0 || level > lp->maxlevel) 358 { 359 nv_putv(np, (char*)&oldlevel, NV_INT16, fp); 360 /* perhaps this should be an error */ 361 return; 362 } 363 if(level==oldlevel) 364 return; 365 if(sp = sh_getscope(level,SEEK_SET)) 366 { 367 sh_setscope(sp); 368 error_info.id = sp->cmdname; 369 370 } 371 } 372 373 static const Namdisc_t level_disc = { sizeof(struct Level), put_level }; 374 375 static struct Level *init_level(int level) 376 { 377 struct Level *lp = newof(NiL,struct Level,1,0); 378 lp->maxlevel = level; 379 _nv_unset(SH_LEVELNOD,0); 380 nv_onattr(SH_LEVELNOD,NV_INT16|NV_NOFREE); 381 nv_putval(SH_LEVELNOD,(char*)&lp->maxlevel,NV_INT16); 382 lp->hdr.disc = &level_disc; 383 nv_disc(SH_LEVELNOD,&lp->hdr,NV_FIRST); 384 return(lp); 385 } 386 387 /* 388 * write the current common on the stack and make it available as .sh.command 389 */ 390 int sh_debug(Shell_t *shp, const char *trap, const char *name, const char *subscript, char *const argv[], int flags) 391 { 392 Stk_t *stkp=shp->stk; 393 struct sh_scoped savst; 394 Namval_t *np = SH_COMMANDNOD; 395 char *sav = stkptr(stkp,0); 396 int n=4, offset=stktell(stkp); 397 const char *cp = "+=( "; 398 Sfio_t *iop = stkstd; 399 short level; 400 if(shp->indebug) 401 return(0); 402 shp->indebug = 1; 403 if(name) 404 { 405 sfputr(iop,name,-1); 406 if(subscript) 407 { 408 sfputc(iop,'['); 409 out_string(iop,subscript,']',1); 410 } 411 if(!(flags&ARG_APPEND)) 412 cp+=1, n-=1; 413 if(!(flags&ARG_ASSIGN)) 414 n -= 2; 415 sfwrite(iop,cp,n); 416 } 417 if(!(flags&ARG_RAW)) 418 out_string(iop, *argv++,' ', 0); 419 n = (flags&ARG_ARITH); 420 while(cp = *argv++) 421 { 422 if((flags&ARG_EXP) && argv[1]==0) 423 out_pattern(iop, cp,' '); 424 else 425 out_string(iop, cp,' ',n?0: (flags&(ARG_RAW|ARG_NOGLOB))||*argv); 426 } 427 if(flags&ARG_ASSIGN) 428 sfputc(iop,')'); 429 else if(iop==stkstd) 430 *stkptr(stkp,stktell(stkp)-1) = 0; 431 np->nvalue.cp = stkfreeze(stkp,1); 432 /* now setup .sh.level variable */ 433 shp->st.lineno = error_info.line; 434 level = shp->fn_depth+shp->dot_depth; 435 if(!SH_LEVELNOD->nvfun || !SH_LEVELNOD->nvfun->disc || nv_isattr(SH_LEVELNOD,NV_INT16|NV_NOFREE)!=(NV_INT16|NV_NOFREE)) 436 init_level(level); 437 else 438 nv_putval(SH_LEVELNOD,(char*)&level,NV_INT16); 439 savst = shp->st; 440 shp->st.trap[SH_DEBUGTRAP] = 0; 441 n = sh_trap(trap,0); 442 np->nvalue.cp = 0; 443 shp->indebug = 0; 444 if(shp->st.cmdname) 445 error_info.id = shp->st.cmdname; 446 nv_putval(SH_PATHNAMENOD,shp->st.filename,NV_NOFREE); 447 nv_putval(SH_FUNNAMENOD,shp->st.funname,NV_NOFREE); 448 shp->st = savst; 449 if(sav != stkptr(stkp,0)) 450 stkset(stkp,sav,0); 451 else 452 stkseek(stkp,offset); 453 return(n); 454 } 455 456 /* 457 * Given stream <iop> compile and execute 458 */ 459 int sh_eval(register Sfio_t *iop, int mode) 460 { 461 register Shnode_t *t; 462 Shell_t *shp = sh_getinterp(); 463 struct slnod *saveslp = shp->st.staklist; 464 int jmpval; 465 struct checkpt *pp = (struct checkpt*)shp->jmplist; 466 struct checkpt buff; 467 static Sfio_t *io_save; 468 volatile int traceon=0, lineno=0; 469 io_save = iop; /* preserve correct value across longjmp */ 470 #define SH_TOPFUN 0x8000 /* this is a temporary tksh hack */ 471 if (mode & SH_TOPFUN) 472 { 473 mode ^= SH_TOPFUN; 474 shp->fn_reset = 1; 475 } 476 sh_pushcontext(&buff,SH_JMPEVAL); 477 buff.olist = pp->olist; 478 jmpval = sigsetjmp(buff.buff,0); 479 if(jmpval==0) 480 { 481 if(mode&SH_READEVAL) 482 { 483 lineno = shp->inlineno; 484 if(traceon=sh_isoption(SH_XTRACE)) 485 sh_offoption(SH_XTRACE); 486 } 487 t = (Shnode_t*)sh_parse(shp,iop,(mode&SH_READEVAL)?0:SH_NL); 488 if(mode&SH_READEVAL) 489 mode &= SH_READEVAL; 490 else 491 sfclose(iop); 492 io_save = 0; 493 if(!sh_isoption(SH_VERBOSE)) 494 sh_offstate(SH_VERBOSE); 495 if(mode && shp->hist_ptr) 496 { 497 hist_flush(shp->hist_ptr); 498 mode = sh_state(SH_INTERACTIVE); 499 } 500 sh_exec(t,sh_isstate(SH_ERREXIT)|mode); 501 } 502 sh_popcontext(&buff); 503 if(traceon) 504 sh_onoption(SH_XTRACE); 505 if(lineno) 506 shp->inlineno = lineno; 507 if(io_save) 508 sfclose(io_save); 509 sh_freeup(shp); 510 shp->st.staklist = saveslp; 511 shp->fn_reset = 0; 512 if(jmpval>SH_JMPEVAL) 513 siglongjmp(*shp->jmplist,jmpval); 514 return(shp->exitval); 515 } 516 517 #if SHOPT_FASTPIPE 518 static int pipe_exec(Shell_t* shp,int pv[], Shnode_t *t, int errorflg) 519 { 520 struct checkpt buff; 521 register Shnode_t *tchild = t->fork.forktre; 522 Namval_t *np; 523 int jmpval; 524 volatile Sfio_t *iop; 525 volatile int r; 526 if((tchild->tre.tretyp&COMMSK)!=TCOM || !(np=(Namval_t*)(tchild->com.comnamp))) 527 { 528 sh_pipe(pv); 529 return(sh_exec(t,errorflg)); 530 } 531 pv[0] = shp->lim.open_max; 532 shp->fdstatus[pv[0]] = IOREAD|IODUP|IOSEEK; 533 pv[1] = shp->lim.open_max+1; 534 shp->fdstatus[pv[1]] = IOWRITE|IOSEEK; 535 iop = sftmp(IOBSIZE+1); 536 shp->sftable[shp->lim.open_max+1] = iop; 537 sh_pushcontext(&buff,SH_JMPIO); 538 if(t->tre.tretyp&FPIN) 539 sh_iosave(shp,0,shp->topfd,(char*)0); 540 sh_iosave(shp,1,shp->topfd,(char*)0); 541 jmpval = sigsetjmp(buff.buff,0); 542 if(jmpval==0) 543 { 544 if(t->tre.tretyp&FPIN) 545 sh_iorenumber(shp,shp->inpipe[0],0); 546 sh_iorenumber(shp,shp->lim.open_max+1,1); 547 r = sh_exec(tchild,errorflg); 548 if(sffileno(sfstdout)>=0) 549 pv[0] = sfsetfd(sfstdout,10); 550 iop = sfswap(sfstdout,0); 551 } 552 sh_popcontext(&buff); 553 shp->sftable[pv[0]] = iop; 554 shp->fdstatus[pv[0]] = IOREAD|IODUP|IOSEEK; 555 sfset(iop,SF_WRITE,0); 556 sfseek(iop,0L,SEEK_SET); 557 sh_iorestore(shp,buff.topfd,jmpval); 558 if(jmpval>SH_JMPIO) 559 siglongjmp(*shp->jmplist,jmpval); 560 return(r); 561 } 562 #endif /* SHOPT_FASTPIPE */ 563 564 /* 565 * returns 1 when option -<c> is specified 566 */ 567 static int checkopt(char *argv[], int c) 568 { 569 char *cp; 570 while(cp = *++argv) 571 { 572 if(*cp=='+') 573 continue; 574 if(*cp!='-' || cp[1]=='-') 575 break; 576 if(strchr(++cp,c)) 577 return(1); 578 if(*cp=='h' && cp[1]==0 && *++argv==0) 579 break; 580 } 581 return(0); 582 } 583 584 static void free_list(struct openlist *olist) 585 { 586 struct openlist *item,*next; 587 for(item=olist;item;item=next) 588 { 589 next = item->next; 590 free((void*)item); 591 } 592 } 593 594 /* 595 * set ${.sh.name} and ${.sh.subscript} 596 * set _ to reference for ${.sh.name}[$.sh.subscript] 597 */ 598 static int set_instance(Namval_t *nq, Namval_t *node, struct Namref *nr) 599 { 600 char *cp = nv_name(nq); 601 Namarr_t *ap; 602 memset(nr,0,sizeof(*nr)); 603 nr->np = nq; 604 nr->root = sh.var_tree; 605 nr->table = sh.last_table; 606 if(sh.var_tree!=sh.var_base && !nv_open(cp,nr->root,NV_VARNAME|NV_NOREF|NV_NOSCOPE|NV_NOADD|NV_NOFAIL)) 607 nr->root = sh.var_base; 608 nv_putval(SH_NAMENOD, cp, NV_NOFREE); 609 memcpy(node,L_ARGNOD,sizeof(*node)); 610 L_ARGNOD->nvalue.nrp = nr; 611 L_ARGNOD->nvflag = NV_REF|NV_NOFREE; 612 L_ARGNOD->nvfun = 0; 613 L_ARGNOD->nvenv = 0; 614 if((ap=nv_arrayptr(nq)) && (cp = nv_getsub(nq)) && (cp = strdup(cp))) 615 { 616 nv_putval(SH_SUBSCRNOD,nr->sub=cp,NV_NOFREE); 617 return(ap->nelem&ARRAY_SCAN); 618 } 619 return(0); 620 } 621 622 static void unset_instance(Namval_t *nq, Namval_t *node, struct Namref *nr,long mode) 623 { 624 L_ARGNOD->nvalue.nrp = node->nvalue.nrp; 625 L_ARGNOD->nvflag = node->nvflag; 626 L_ARGNOD->nvfun = node->nvfun; 627 if(nr->sub) 628 { 629 nv_putsub(nq, nr->sub, mode); 630 free((void*)nr->sub); 631 } 632 nv_unset(SH_NAMENOD); 633 nv_unset(SH_SUBSCRNOD); 634 } 635 636 int sh_exec(register const Shnode_t *t, int flags) 637 { 638 register Shell_t *shp = &sh; 639 Stk_t *stkp = shp->stk; 640 sh_sigcheck(); 641 if(t && !shp->st.execbrk && !sh_isoption(SH_NOEXEC)) 642 { 643 register int type = flags; 644 register char *com0 = 0; 645 int errorflg = (type&sh_state(SH_ERREXIT))|OPTIMIZE; 646 int execflg = (type&sh_state(SH_NOFORK)); 647 int mainloop = (type&sh_state(SH_INTERACTIVE)); 648 #if SHOPT_AMP || SHOPT_SPAWN 649 int ntflag = (type&sh_state(SH_NTFORK)); 650 #endif 651 int topfd = shp->topfd; 652 char *sav=stkptr(stkp,0); 653 char *cp=0, **com=0, *comn; 654 int argn; 655 int skipexitset = 0; 656 int was_interactive = 0; 657 int was_errexit = sh_isstate(SH_ERREXIT); 658 int was_monitor = sh_isstate(SH_MONITOR); 659 int echeck = 0; 660 if(flags&sh_state(SH_INTERACTIVE)) 661 { 662 pipejob = 0; 663 job.curpgid = 0; 664 flags &= ~sh_state(SH_INTERACTIVE); 665 } 666 sh_offstate(SH_ERREXIT); 667 sh_offstate(SH_DEFPATH); 668 if(was_errexit&flags) 669 sh_onstate(SH_ERREXIT); 670 if(was_monitor&flags) 671 sh_onstate(SH_MONITOR); 672 type = t->tre.tretyp; 673 if(!shp->intrap) 674 shp->oldexit=shp->exitval; 675 shp->exitval=0; 676 shp->lastsig = 0; 677 shp->lastpath = 0; 678 switch(type&COMMSK) 679 { 680 case TCOM: 681 { 682 register struct argnod *argp; 683 char *trap; 684 Namval_t *np, *nq, *last_table; 685 struct ionod *io; 686 int command=0, flgs=NV_ASSIGN; 687 shp->bltindata.invariant = type>>(COMBITS+2); 688 type &= (COMMSK|COMSCAN); 689 sh_stats(STAT_SCMDS); 690 error_info.line = t->com.comline-shp->st.firstline; 691 com = sh_argbuild(shp,&argn,&(t->com),OPTIMIZE); 692 echeck = 1; 693 if(t->tre.tretyp&COMSCAN) 694 { 695 argp = t->com.comarg; 696 if(argp && *com && !(argp->argflag&ARG_RAW)) 697 sh_sigcheck(); 698 } 699 np = (Namval_t*)(t->com.comnamp); 700 nq = (Namval_t*)(t->com.comnamq); 701 com0 = com[0]; 702 shp->xargexit = 0; 703 while(np==SYSCOMMAND) 704 { 705 register int n = b_command(0,com,&shp->bltindata); 706 if(n==0) 707 break; 708 command += n; 709 np = 0; 710 if(!(com0= *(com+=n))) 711 break; 712 np = nv_bfsearch(com0, shp->bltin_tree, &nq, &cp); 713 } 714 if(shp->xargexit) 715 { 716 shp->xargmin -= command; 717 shp->xargmax -= command; 718 } 719 else 720 shp->xargmin = 0; 721 argn -= command; 722 if(!command && np && is_abuiltin(np)) 723 np = dtsearch(shp->fun_tree,np); 724 if(com0) 725 { 726 if(!np && !strchr(com0,'/')) 727 { 728 Dt_t *root = command?shp->bltin_tree:shp->fun_tree; 729 np = nv_bfsearch(com0, root, &nq, &cp); 730 #if SHOPT_NAMESPACE 731 if(shp->namespace && !nq && !cp) 732 { 733 int offset = stktell(stkp); 734 sfputr(stkp,nv_name(shp->namespace),-1); 735 sfputc(stkp,'.'); 736 sfputr(stkp,com0,0); 737 stkseek(stkp,offset); 738 np = nv_bfsearch(stkptr(stkp,offset), root, &nq, &cp); 739 } 740 #endif /* SHOPT_NAMESPACE */ 741 } 742 comn = com[argn-1]; 743 } 744 io = t->tre.treio; 745 if(shp->envlist = argp = t->com.comset) 746 { 747 if(argn==0 || (np && nv_isattr(np,BLT_SPC))) 748 { 749 if(argn) 750 { 751 if(checkopt(com,'A')) 752 flgs |= NV_ARRAY; 753 else if(checkopt(com,'a')) 754 flgs |= NV_IARRAY; 755 } 756 #if SHOPT_BASH 757 if(np==SYSLOCAL) 758 { 759 if(!nv_getval(SH_FUNNAMENOD)) 760 errormsg(SH_DICT,ERROR_exit(1),"%s: can only be used in a function",com0); 761 if(!shp->st.var_local) 762 { 763 sh_scope(shp,(struct argnod*)0,0); 764 shp->st.var_local = shp->var_tree; 765 } 766 767 } 768 if(np==SYSTYPESET || np==SYSLOCAL) 769 #else 770 if(np==SYSTYPESET || (np && np->nvalue.bfp==SYSTYPESET->nvalue.bfp)) 771 #endif 772 { 773 if(np!=SYSTYPESET) 774 shp->typeinit = np; 775 if(checkopt(com,'C')) 776 flgs |= NV_COMVAR; 777 if(checkopt(com,'S')) 778 flgs |= NV_STATIC; 779 if(checkopt(com,'n')) 780 flgs |= NV_NOREF; 781 #if SHOPT_TYPEDEF 782 else if(argn>=3 && checkopt(com,'T')) 783 { 784 shp->prefix = NV_CLASS; 785 flgs |= NV_TYPE; 786 787 } 788 #endif /* SHOPT_TYPEDEF */ 789 if((shp->fn_depth && !shp->prefix) || np==SYSLOCAL) 790 flgs |= NV_NOSCOPE; 791 } 792 else if(np==SYSEXPORT) 793 flgs |= NV_EXPORT; 794 if(flgs&(NV_EXPORT|NV_NOREF)) 795 flgs |= NV_IDENT; 796 else 797 flgs |= NV_VARNAME; 798 #if 0 799 if(OPTIMIZE) 800 flgs |= NV_TAGGED; 801 #endif 802 nv_setlist(argp,flgs); 803 if(np==shp->typeinit) 804 shp->typeinit = 0; 805 shp->envlist = argp; 806 argp = NULL; 807 } 808 } 809 last_table = shp->last_table; 810 shp->last_table = 0; 811 if((io||argn)) 812 { 813 Shbltin_t *bp=0; 814 static char *argv[1]; 815 int tflags = 1; 816 if(np && nv_isattr(np,BLT_DCL)) 817 tflags |= 2; 818 if(argn==0) 819 { 820 /* fake 'true' built-in */ 821 np = SYSTRUE; 822 *argv = nv_name(np); 823 com = argv; 824 } 825 /* set +x doesn't echo */ 826 else if((np!=SYSSET) && sh_isoption(SH_XTRACE)) 827 sh_trace(com-command,tflags); 828 else if((t->tre.tretyp&FSHOWME) && sh_isoption(SH_SHOWME)) 829 { 830 int ison = sh_isoption(SH_XTRACE); 831 if(!ison) 832 sh_onoption(SH_XTRACE); 833 sh_trace(com-command,tflags); 834 if(io) 835 sh_redirect(shp,io,SH_SHOWME); 836 if(!ison) 837 sh_offoption(SH_XTRACE); 838 break; 839 } 840 if(trap=shp->st.trap[SH_DEBUGTRAP]) 841 { 842 int n = sh_debug(shp,trap,(char*)0,(char*)0, com, ARG_RAW); 843 if(n==255 && shp->fn_depth+shp->dot_depth) 844 { 845 np = SYSRETURN; 846 argn = 1; 847 com[0] = np->nvname; 848 com[1] = 0; 849 io = 0; 850 argp = 0; 851 } 852 else if(n==2) 853 break; 854 } 855 if(io) 856 sfsync(shp->outpool); 857 shp->lastpath = 0; 858 if(!np && !strchr(com0,'/')) 859 { 860 if(path_search(com0,NIL(Pathcomp_t**),1)) 861 { 862 error_info.line = t->com.comline-shp->st.firstline; 863 if((np=nv_search(com0,shp->fun_tree,0)) && !np->nvalue.ip) 864 { 865 Namval_t *mp=nv_search(com0,shp->bltin_tree,0); 866 if(mp) 867 np = mp; 868 } 869 } 870 else 871 { 872 if((np=nv_search(com0,shp->track_tree,0)) && !nv_isattr(np,NV_NOALIAS) && np->nvalue.cp) 873 np=nv_search(nv_getval(np),shp->bltin_tree,0); 874 else 875 np = 0; 876 } 877 } 878 /* check for builtins */ 879 if(np && is_abuiltin(np)) 880 { 881 volatile int scope=0, share=0; 882 volatile void *save_ptr; 883 volatile void *save_data; 884 int jmpval, save_prompt; 885 struct checkpt buff; 886 unsigned long was_vi=0, was_emacs=0, was_gmacs=0; 887 struct stat statb; 888 bp = &shp->bltindata; 889 save_ptr = bp->ptr; 890 save_data = bp->data; 891 memset(&statb, 0, sizeof(struct stat)); 892 if(strchr(nv_name(np),'/')) 893 { 894 /* 895 * disable editors for built-in 896 * versions of commands on PATH 897 */ 898 was_vi = sh_isoption(SH_VI); 899 was_emacs = sh_isoption(SH_EMACS); 900 was_gmacs = sh_isoption(SH_GMACS); 901 sh_offoption(SH_VI); 902 sh_offoption(SH_EMACS); 903 sh_offoption(SH_GMACS); 904 } 905 sh_pushcontext(&buff,SH_JMPCMD); 906 jmpval = sigsetjmp(buff.buff,1); 907 if(jmpval == 0) 908 { 909 if(!(nv_isattr(np,BLT_ENV))) 910 error_info.flags |= ERROR_SILENT; 911 errorpush(&buff.err,0); 912 if(io) 913 { 914 struct openlist *item; 915 if(np==SYSLOGIN) 916 type=1; 917 else if(np==SYSEXEC) 918 type=1+!com[1]; 919 else 920 type = (execflg && !shp->subshell && !shp->st.trapcom[0]); 921 sh_redirect(shp,io,type); 922 for(item=buff.olist;item;item=item->next) 923 item->strm=0; 924 } 925 if(!(nv_isattr(np,BLT_ENV))) 926 { 927 if(bp->nosfio) 928 { 929 if(!shp->pwd) 930 path_pwd(0); 931 if(shp->pwd) 932 stat(".",&statb); 933 } 934 sfsync(NULL); 935 share = sfset(sfstdin,SF_SHARE,0); 936 sh_onstate(SH_STOPOK); 937 sfpool(sfstderr,NIL(Sfio_t*),SF_WRITE); 938 sfset(sfstderr,SF_LINE,1); 939 save_prompt = shp->nextprompt; 940 shp->nextprompt = 0; 941 } 942 if(argp) 943 { 944 scope++; 945 sh_scope(shp,argp,0); 946 } 947 opt_info.index = opt_info.offset = 0; 948 opt_info.disc = 0; 949 error_info.id = *com; 950 if(argn) 951 shp->exitval = 0; 952 shp->bltinfun = funptr(np); 953 bp->bnode = np; 954 bp->vnode = nq; 955 bp->ptr = nv_context(np); 956 bp->data = t->com.comstate; 957 bp->sigset = 0; 958 bp->notify = 0; 959 bp->flags = (OPTIMIZE!=0); 960 if(shp->subshell && nv_isattr(np,BLT_NOSFIO)) 961 sh_subtmpfile(0); 962 if(execflg && !shp->subshell && 963 !shp->st.trapcom[0] && !shp->st.trap[SH_ERRTRAP] && shp->fn_depth==0 && !nv_isattr(np,BLT_ENV)) 964 { 965 /* do close-on-exec */ 966 int fd; 967 for(fd=0; fd < shp->lim.open_max; fd++) 968 if((shp->fdstatus[fd]&IOCLEX)&&fd!=shp->infd) 969 sh_close(fd); 970 } 971 if(argn) 972 shp->exitval = (*shp->bltinfun)(argn,com,(void*)bp); 973 if(error_info.flags&ERROR_INTERACTIVE) 974 tty_check(ERRIO); 975 ((Shnode_t*)t)->com.comstate = shp->bltindata.data; 976 bp->data = (void*)save_data; 977 if(!nv_isattr(np,BLT_EXIT) && shp->exitval!=SH_RUNPROG) 978 shp->exitval &= SH_EXITMASK; 979 } 980 else 981 { 982 struct openlist *item; 983 for(item=buff.olist;item;item=item->next) 984 { 985 if(item->strm) 986 { 987 sfclrlock(item->strm); 988 if(shp->hist_ptr && item->strm == shp->hist_ptr->histfp) 989 hist_close(shp->hist_ptr); 990 else 991 sfclose(item->strm); 992 } 993 } 994 if(shp->bltinfun && (error_info.flags&ERROR_NOTIFY)) 995 (*shp->bltinfun)(-2,com,(void*)bp); 996 /* failure on special built-ins fatal */ 997 if(jmpval<=SH_JMPCMD && (!nv_isattr(np,BLT_SPC) || command)) 998 jmpval=0; 999 } 1000 if(bp && bp->ptr!= nv_context(np)) 1001 np->nvfun = (Namfun_t*)bp->ptr; 1002 if(!(nv_isattr(np,BLT_ENV))) 1003 { 1004 if(bp->nosfio && shp->pwd) 1005 { 1006 struct stat stata; 1007 stat(".",&stata); 1008 /* restore directory changed */ 1009 if(statb.st_ino!=stata.st_ino || statb.st_dev!=stata.st_dev) 1010 chdir(shp->pwd); 1011 } 1012 sh_offstate(SH_STOPOK); 1013 if(share&SF_SHARE) 1014 sfset(sfstdin,SF_PUBLIC|SF_SHARE,1); 1015 sfset(sfstderr,SF_LINE,0); 1016 sfpool(sfstderr,shp->outpool,SF_WRITE); 1017 sfpool(sfstdin,NIL(Sfio_t*),SF_WRITE); 1018 shp->nextprompt = save_prompt; 1019 } 1020 sh_popcontext(&buff); 1021 errorpop(&buff.err); 1022 error_info.flags &= ~ERROR_SILENT; 1023 shp->bltinfun = 0; 1024 if(buff.olist) 1025 free_list(buff.olist); 1026 if(was_vi) 1027 sh_onoption(SH_VI); 1028 else if(was_emacs) 1029 sh_onoption(SH_EMACS); 1030 else if(was_gmacs) 1031 sh_onoption(SH_GMACS); 1032 if(scope) 1033 sh_unscope(shp); 1034 bp->ptr = (void*)save_ptr; 1035 bp->data = (void*)save_data; 1036 /* don't restore for subshell exec */ 1037 if((shp->topfd>topfd) && !(shp->subshell && np==SYSEXEC)) 1038 sh_iorestore(shp,topfd,jmpval); 1039 if(jmpval) 1040 siglongjmp(*shp->jmplist,jmpval); 1041 #if 0 1042 if(flgs&NV_STATIC) 1043 ((Shnode_t*)t)->com.comset = 0; 1044 #endif 1045 if(shp->exitval >=0) 1046 goto setexit; 1047 np = 0; 1048 type=0; 1049 } 1050 /* check for functions */ 1051 if(!command && np && nv_isattr(np,NV_FUNCTION)) 1052 { 1053 volatile int indx; 1054 int jmpval=0; 1055 struct checkpt buff; 1056 Namval_t node; 1057 struct Namref nr; 1058 long mode; 1059 register struct slnod *slp; 1060 if(!np->nvalue.ip) 1061 { 1062 indx = path_search(com0,NIL(Pathcomp_t**),0); 1063 if(indx==1) 1064 np = nv_search(com0,shp->fun_tree,HASH_NOSCOPE); 1065 1066 if(!np->nvalue.ip) 1067 { 1068 if(indx==1) 1069 { 1070 errormsg(SH_DICT,ERROR_exit(0),e_defined,com0); 1071 shp->exitval = ERROR_NOEXEC; 1072 } 1073 else 1074 { 1075 errormsg(SH_DICT,ERROR_exit(0),e_found,"function"); 1076 shp->exitval = ERROR_NOENT; 1077 } 1078 goto setexit; 1079 } 1080 } 1081 /* increase refcnt for unset */ 1082 slp = (struct slnod*)np->nvenv; 1083 sh_funstaks(slp->slchild,1); 1084 staklink(slp->slptr); 1085 if(nq) 1086 { 1087 shp->last_table = last_table; 1088 mode = set_instance(nq,&node,&nr); 1089 } 1090 if(io) 1091 { 1092 indx = shp->topfd; 1093 sh_pushcontext(&buff,SH_JMPCMD); 1094 jmpval = sigsetjmp(buff.buff,0); 1095 } 1096 if(jmpval == 0) 1097 { 1098 if(io) 1099 indx = sh_redirect(shp,io,execflg); 1100 sh_funct(shp,np,argn,com,t->com.comset,(flags&~OPTIMIZE_FLAG)); 1101 } 1102 if(io) 1103 { 1104 if(buff.olist) 1105 free_list(buff.olist); 1106 sh_popcontext(&buff); 1107 sh_iorestore(shp,indx,jmpval); 1108 } 1109 if(nq) 1110 unset_instance(nq,&node,&nr,mode); 1111 sh_funstaks(slp->slchild,-1); 1112 stakdelete(slp->slptr); 1113 if(jmpval > SH_JMPFUN) 1114 siglongjmp(*shp->jmplist,jmpval); 1115 goto setexit; 1116 } 1117 } 1118 else if(!io) 1119 { 1120 setexit: 1121 exitset(); 1122 break; 1123 } 1124 } 1125 case TFORK: 1126 { 1127 register pid_t parent; 1128 int no_fork,jobid; 1129 int pipes[2]; 1130 no_fork = (execflg && !(type&(FAMP|FPOU)) && 1131 #if SHOPT_AMP || SHOPT_SPAWN 1132 !ntflag && 1133 #endif 1134 !shp->subshell && !shp->st.trapcom[0] && 1135 !shp->st.trap[SH_ERRTRAP] && shp->fn_depth==0 && 1136 !(pipejob && sh_isoption(SH_PIPEFAIL))); 1137 if(shp->subshell) 1138 sh_subtmpfile(1); 1139 if(sh_isstate(SH_PROFILE) || shp->dot_depth) 1140 { 1141 /* disable foreground job monitor */ 1142 if(!(type&FAMP)) 1143 sh_offstate(SH_MONITOR); 1144 #if SHOPT_DEVFD 1145 else if(!(type&FINT)) 1146 sh_offstate(SH_MONITOR); 1147 #endif /* SHOPT_DEVFD */ 1148 } 1149 if(no_fork) 1150 job.parent=parent=0; 1151 else 1152 { 1153 if(type&FCOOP) 1154 coproc_init(shp,pipes); 1155 nv_getval(RANDNOD); 1156 #if SHOPT_AMP 1157 if((type&(FAMP|FINT)) == (FAMP|FINT)) 1158 parent = sh_ntfork(shp,t,com,&jobid,ntflag); 1159 else 1160 parent = sh_fork(type,&jobid); 1161 if(parent<0) 1162 break; 1163 #else 1164 #if SHOPT_SPAWN 1165 # ifdef _lib_fork 1166 if(com) 1167 parent = sh_ntfork(shp,t,com,&jobid,ntflag); 1168 else 1169 parent = sh_fork(type,&jobid); 1170 # else 1171 if((parent = sh_ntfork(shp,t,com,&jobid,ntflag))<=0) 1172 break; 1173 # endif /* _lib_fork */ 1174 if(parent<0) 1175 break; 1176 #else 1177 parent = sh_fork(type,&jobid); 1178 #endif /* SHOPT_SPAWN */ 1179 #endif 1180 } 1181 if(job.parent=parent) 1182 /* This is the parent branch of fork 1183 * It may or may not wait for the child 1184 */ 1185 { 1186 if(type&FPCL) 1187 sh_close(shp->inpipe[0]); 1188 if(type&(FCOOP|FAMP)) 1189 shp->bckpid = parent; 1190 else if(!(type&(FAMP|FPOU))) 1191 { 1192 if(shp->topfd > topfd) 1193 sh_iorestore(shp,topfd,0); 1194 if(!sh_isoption(SH_MONITOR)) 1195 { 1196 if(!(shp->sigflag[SIGINT]&(SH_SIGFAULT|SH_SIGOFF))) 1197 sh_sigtrap(SIGINT); 1198 shp->trapnote |= SH_SIGIGNORE; 1199 } 1200 if(execflg && shp->subshell) 1201 { 1202 shp->spid = parent; 1203 job.pwlist->p_env--; 1204 } 1205 else 1206 job_wait(parent); 1207 if(!sh_isoption(SH_MONITOR)) 1208 { 1209 shp->trapnote &= ~SH_SIGIGNORE; 1210 if(shp->exitval == (SH_EXITSIG|SIGINT)) 1211 sh_fault(SIGINT); 1212 } 1213 } 1214 if(type&FAMP) 1215 { 1216 if(sh_isstate(SH_PROFILE) || sh_isstate(SH_INTERACTIVE)) 1217 { 1218 /* print job number */ 1219 #ifdef JOBS 1220 sfprintf(sfstderr,"[%d]\t%d\n",jobid,parent); 1221 #else 1222 sfprintf(sfstderr,"%d\n",parent); 1223 #endif /* JOBS */ 1224 } 1225 } 1226 break; 1227 } 1228 else 1229 /* 1230 * this is the FORKED branch (child) of execute 1231 */ 1232 { 1233 volatile int jmpval; 1234 struct checkpt buff; 1235 if(no_fork) 1236 sh_sigreset(2); 1237 sh_pushcontext(&buff,SH_JMPEXIT); 1238 jmpval = sigsetjmp(buff.buff,0); 1239 if(jmpval) 1240 goto done; 1241 if((type&FINT) && !sh_isstate(SH_MONITOR)) 1242 { 1243 /* default std input for & */ 1244 signal(SIGINT,SIG_IGN); 1245 signal(SIGQUIT,SIG_IGN); 1246 if(!shp->st.ioset) 1247 { 1248 if(sh_close(0)>=0) 1249 sh_chkopen(e_devnull); 1250 } 1251 } 1252 sh_offstate(SH_MONITOR); 1253 /* pipe in or out */ 1254 #ifdef _lib_nice 1255 if((type&FAMP) && sh_isoption(SH_BGNICE)) 1256 nice(4); 1257 #endif /* _lib_nice */ 1258 if(type&FPIN) 1259 { 1260 sh_iorenumber(shp,shp->inpipe[0],0); 1261 if(!(type&FPOU) || (type&FCOOP)) 1262 sh_close(shp->inpipe[1]); 1263 } 1264 if(type&FPOU) 1265 { 1266 sh_iorenumber(shp,shp->outpipe[1],1); 1267 sh_pclose(shp->outpipe); 1268 } 1269 if((type&COMMSK)!=TCOM) 1270 error_info.line = t->fork.forkline-shp->st.firstline; 1271 if(shp->topfd) 1272 sh_iounsave(shp); 1273 topfd = shp->topfd; 1274 sh_redirect(shp,t->tre.treio,1); 1275 if(shp->topfd > topfd) 1276 { 1277 while((parent = vfork()) < 0) 1278 _sh_fork(parent, 0, (int*)0); 1279 if(parent) 1280 { 1281 job_clear(); 1282 job_post(parent,0); 1283 job_wait(parent); 1284 sh_iorestore(shp,topfd,SH_JMPCMD); 1285 sh_done(shp,(shp->exitval&SH_EXITSIG)?(shp->exitval&SH_EXITMASK):0); 1286 1287 } 1288 } 1289 if((type&COMMSK)!=TCOM) 1290 { 1291 /* don't clear job table for out 1292 pipes so that jobs comand can 1293 be used in a pipeline 1294 */ 1295 if(!no_fork && !(type&FPOU)) 1296 job_clear(); 1297 sh_exec(t->fork.forktre,flags|sh_state(SH_NOFORK)); 1298 } 1299 else if(com0) 1300 { 1301 sh_offoption(SH_ERREXIT); 1302 sh_freeup(shp); 1303 path_exec(com0,com,t->com.comset); 1304 } 1305 done: 1306 sh_popcontext(&buff); 1307 if(jmpval>SH_JMPEXIT) 1308 siglongjmp(*shp->jmplist,jmpval); 1309 sh_done(shp,0); 1310 } 1311 } 1312 1313 case TSETIO: 1314 { 1315 /* 1316 * don't create a new process, just 1317 * save and restore io-streams 1318 */ 1319 pid_t pid; 1320 int jmpval, waitall; 1321 struct checkpt buff; 1322 if(shp->subshell) 1323 execflg = 0; 1324 sh_pushcontext(&buff,SH_JMPIO); 1325 if(type&FPIN) 1326 { 1327 was_interactive = sh_isstate(SH_INTERACTIVE); 1328 sh_offstate(SH_INTERACTIVE); 1329 if(!execflg) 1330 sh_iosave(shp,0,shp->topfd,(char*)0); 1331 sh_iorenumber(shp,shp->inpipe[0],0); 1332 /* 1333 * if read end of pipe is a simple command 1334 * treat as non-sharable to improve performance 1335 */ 1336 if((t->fork.forktre->tre.tretyp&COMMSK)==TCOM) 1337 sfset(sfstdin,SF_PUBLIC|SF_SHARE,0); 1338 waitall = job.waitall; 1339 job.waitall = 0; 1340 pid = job.parent; 1341 } 1342 else 1343 error_info.line = t->fork.forkline-shp->st.firstline; 1344 jmpval = sigsetjmp(buff.buff,0); 1345 if(jmpval==0) 1346 { 1347 sh_redirect(shp,t->fork.forkio,execflg); 1348 (t->fork.forktre)->tre.tretyp |= t->tre.tretyp&FSHOWME; 1349 sh_exec(t->fork.forktre,flags); 1350 } 1351 else 1352 sfsync(shp->outpool); 1353 sh_popcontext(&buff); 1354 sh_iorestore(shp,buff.topfd,jmpval); 1355 if(buff.olist) 1356 free_list(buff.olist); 1357 if(type&FPIN) 1358 { 1359 job.waitall = waitall; 1360 type = shp->exitval; 1361 if(!(type&SH_EXITSIG)) 1362 { 1363 /* wait for remainder of pipline */ 1364 job_wait(waitall?pid:0); 1365 if(type || !sh_isoption(SH_PIPEFAIL)) 1366 shp->exitval = type; 1367 } 1368 shp->st.ioset = 0; 1369 } 1370 if(jmpval>SH_JMPIO) 1371 siglongjmp(*shp->jmplist,jmpval); 1372 break; 1373 } 1374 1375 case TPAR: 1376 echeck = 1; 1377 flags &= ~OPTIMIZE_FLAG; 1378 if(!shp->subshell && !shp->st.trapcom[0] && !shp->st.trap[SH_ERRTRAP] && (flags&sh_state(SH_NOFORK))) 1379 { 1380 int jmpval; 1381 struct checkpt buff; 1382 sh_pushcontext(&buff,SH_JMPEXIT); 1383 jmpval = sigsetjmp(buff.buff,0); 1384 if(jmpval==0) 1385 sh_exec(t->par.partre,flags); 1386 sh_popcontext(&buff); 1387 if(jmpval > SH_JMPEXIT) 1388 siglongjmp(*shp->jmplist,jmpval); 1389 sh_done(shp,0); 1390 } 1391 else 1392 sh_subshell(t->par.partre,flags,0); 1393 break; 1394 1395 case TFIL: 1396 { 1397 /* 1398 * This code sets up a pipe. 1399 * All elements of the pipe are started by the parent. 1400 * The last element executes in current environment 1401 */ 1402 int pvo[2]; /* old pipe for multi-stage */ 1403 int pvn[2]; /* current set up pipe */ 1404 int savepipe = pipejob; 1405 int showme = t->tre.tretyp&FSHOWME; 1406 pid_t savepgid = job.curpgid; 1407 job.curpgid = 0; 1408 if(shp->subshell) 1409 sh_subtmpfile(1); 1410 shp->inpipe = pvo; 1411 shp->outpipe = pvn; 1412 pvo[1] = -1; 1413 if(sh_isoption(SH_PIPEFAIL)) 1414 job.waitall = 1; 1415 else 1416 job.waitall |= !pipejob && sh_isstate(SH_MONITOR); 1417 do 1418 { 1419 #if SHOPT_FASTPIPE 1420 type = pipe_exec(shp,pvn,t->lst.lstlef, errorflg); 1421 #else 1422 /* create the pipe */ 1423 sh_pipe(pvn); 1424 /* execute out part of pipe no wait */ 1425 (t->lst.lstlef)->tre.tretyp |= showme; 1426 type = sh_exec(t->lst.lstlef, errorflg); 1427 #endif /* SHOPT_FASTPIPE */ 1428 pipejob=1; 1429 /* save the pipe stream-ids */ 1430 pvo[0] = pvn[0]; 1431 /* close out-part of pipe */ 1432 sh_close(pvn[1]); 1433 /* pipeline all in one process group */ 1434 t = t->lst.lstrit; 1435 } 1436 /* repeat until end of pipeline */ 1437 while(!type && t->tre.tretyp==TFIL); 1438 shp->inpipe = pvn; 1439 shp->outpipe = 0; 1440 if(type == 0) 1441 { 1442 /* 1443 * execute last element of pipeline 1444 * in the current process 1445 */ 1446 ((Shnode_t*)t)->tre.tretyp |= showme; 1447 sh_exec(t,flags); 1448 } 1449 else 1450 /* execution failure, close pipe */ 1451 sh_pclose(pvn); 1452 pipejob = savepipe; 1453 #ifdef SIGTSTP 1454 if(!pipejob && sh_isstate(SH_MONITOR)) 1455 tcsetpgrp(JOBTTY,shp->pid); 1456 #endif /*SIGTSTP */ 1457 job.curpgid = savepgid; 1458 break; 1459 } 1460 1461 case TLST: 1462 { 1463 /* a list of commands are executed here */ 1464 do 1465 { 1466 sh_exec(t->lst.lstlef,errorflg|OPTIMIZE); 1467 t = t->lst.lstrit; 1468 } 1469 while(t->tre.tretyp == TLST); 1470 sh_exec(t,flags); 1471 break; 1472 } 1473 1474 case TAND: 1475 if(type&TTEST) 1476 skipexitset++; 1477 if(sh_exec(t->lst.lstlef,OPTIMIZE)==0) 1478 sh_exec(t->lst.lstrit,flags); 1479 break; 1480 1481 case TORF: 1482 if(type&TTEST) 1483 skipexitset++; 1484 if(sh_exec(t->lst.lstlef,OPTIMIZE)!=0) 1485 sh_exec(t->lst.lstrit,flags); 1486 break; 1487 1488 case TFOR: /* for and select */ 1489 { 1490 register char **args; 1491 register int nargs; 1492 register Namval_t *np; 1493 int flag = errorflg|OPTIMIZE_FLAG; 1494 struct dolnod *argsav=0; 1495 struct comnod *tp; 1496 char *cp, *trap, *nullptr = 0; 1497 int nameref, refresh=1; 1498 char *av[5]; 1499 #if SHOPT_OPTIMIZE 1500 int jmpval = ((struct checkpt*)shp->jmplist)->mode; 1501 struct checkpt buff; 1502 void *optlist = shp->optlist; 1503 shp->optlist = 0; 1504 sh_tclear(t->for_.fortre); 1505 sh_pushcontext(&buff,jmpval); 1506 jmpval = sigsetjmp(buff.buff,0); 1507 if(jmpval) 1508 goto endfor; 1509 #endif /* SHOPT_OPTIMIZE */ 1510 error_info.line = t->for_.forline-shp->st.firstline; 1511 if(!(tp=t->for_.forlst)) 1512 { 1513 args=shp->st.dolv+1; 1514 nargs = shp->st.dolc; 1515 argsav=sh_arguse(shp); 1516 } 1517 else 1518 { 1519 args=sh_argbuild(shp,&argn,tp,0); 1520 nargs = argn; 1521 } 1522 np = nv_open(t->for_.fornam, shp->var_tree,NV_NOASSIGN|NV_NOARRAY|NV_VARNAME|NV_NOREF); 1523 nameref = nv_isref(np)!=0; 1524 shp->st.loopcnt++; 1525 cp = *args; 1526 while(cp && shp->st.execbrk==0) 1527 { 1528 if(t->tre.tretyp&COMSCAN) 1529 { 1530 char *val; 1531 int save_prompt; 1532 /* reuse register */ 1533 if(refresh) 1534 { 1535 sh_menu(sfstderr,nargs,args); 1536 refresh = 0; 1537 } 1538 save_prompt = shp->nextprompt; 1539 shp->nextprompt = 3; 1540 shp->timeout = 0; 1541 shp->exitval=sh_readline(shp,&nullptr,0,1,1000*shp->st.tmout); 1542 shp->nextprompt = save_prompt; 1543 if(shp->exitval||sfeof(sfstdin)||sferror(sfstdin)) 1544 { 1545 shp->exitval = 1; 1546 break; 1547 } 1548 if(!(val=nv_getval(sh_scoped(shp,REPLYNOD)))) 1549 continue; 1550 else 1551 { 1552 if(*(cp=val) == 0) 1553 { 1554 refresh++; 1555 goto check; 1556 } 1557 while(type = *cp++) 1558 if(type < '0' && type > '9') 1559 break; 1560 if(type!=0) 1561 type = nargs; 1562 else 1563 type = (int)strtol(val, (char**)0, 10)-1; 1564 if(type<0 || type >= nargs) 1565 cp = ""; 1566 else 1567 cp = args[type]; 1568 } 1569 } 1570 if(nameref) 1571 nv_offattr(np,NV_REF); 1572 else if(nv_isattr(np, NV_ARRAY)) 1573 nv_putsub(np,NIL(char*),0L); 1574 nv_putval(np,cp,0); 1575 if(nameref) 1576 nv_setref(np,(Dt_t*)0,NV_VARNAME); 1577 if(trap=shp->st.trap[SH_DEBUGTRAP]) 1578 { 1579 av[0] = (t->tre.tretyp&COMSCAN)?"select":"for"; 1580 av[1] = t->for_.fornam; 1581 av[2] = "in"; 1582 av[3] = cp; 1583 av[4] = 0; 1584 sh_debug(shp,trap,(char*)0,(char*)0,av,0); 1585 } 1586 sh_exec(t->for_.fortre,flag); 1587 flag &= ~OPTIMIZE_FLAG; 1588 if(t->tre.tretyp&COMSCAN) 1589 { 1590 if((cp=nv_getval(sh_scoped(shp,REPLYNOD))) && *cp==0) 1591 refresh++; 1592 } 1593 else 1594 cp = *++args; 1595 check: 1596 if(shp->st.breakcnt<0) 1597 shp->st.execbrk = (++shp->st.breakcnt !=0); 1598 } 1599 #if SHOPT_OPTIMIZE 1600 endfor: 1601 sh_popcontext(&buff); 1602 sh_tclear(t->for_.fortre); 1603 sh_optclear(shp,optlist); 1604 if(jmpval) 1605 siglongjmp(*shp->jmplist,jmpval); 1606 #endif /*SHOPT_OPTIMIZE */ 1607 if(shp->st.breakcnt>0) 1608 shp->st.execbrk = (--shp->st.breakcnt !=0); 1609 shp->st.loopcnt--; 1610 sh_argfree(shp,argsav,0); 1611 nv_close(np); 1612 break; 1613 } 1614 1615 case TWH: /* while and until */ 1616 { 1617 volatile int r=0; 1618 int first = OPTIMIZE_FLAG; 1619 Shnode_t *tt = t->wh.whtre; 1620 #if SHOPT_FILESCAN 1621 Sfio_t *iop=0; 1622 int savein,fd; 1623 #endif /*SHOPT_FILESCAN*/ 1624 #if SHOPT_OPTIMIZE 1625 int jmpval = ((struct checkpt*)shp->jmplist)->mode; 1626 struct checkpt buff; 1627 void *optlist = shp->optlist; 1628 shp->optlist = 0; 1629 sh_tclear(t->wh.whtre); 1630 sh_tclear(t->wh.dotre); 1631 sh_pushcontext(&buff,jmpval); 1632 jmpval = sigsetjmp(buff.buff,0); 1633 if(jmpval) 1634 goto endwhile; 1635 #endif /* SHOPT_OPTIMIZE */ 1636 #if SHOPT_FILESCAN 1637 if(type==TWH && tt->tre.tretyp==TCOM && !tt->com.comarg && tt->com.comio) 1638 { 1639 fd = sh_redirect(shp,tt->com.comio,3); 1640 savein = dup(0); 1641 if(fd==0) 1642 fd = savein; 1643 iop = sfnew(NULL,NULL,SF_UNBOUND,fd,SF_READ); 1644 close(0); 1645 open("/dev/null",O_RDONLY); 1646 shp->offsets[0] = -1; 1647 shp->offsets[1] = 0; 1648 if(tt->com.comset) 1649 nv_setlist(tt->com.comset,NV_IDENT|NV_ASSIGN); 1650 } 1651 #endif /*SHOPT_FILESCAN */ 1652 shp->st.loopcnt++; 1653 while(shp->st.execbrk==0) 1654 { 1655 #if SHOPT_FILESCAN 1656 if(iop) 1657 { 1658 if(!(shp->cur_line=sfgetr(iop,'\n',SF_STRING))) 1659 break; 1660 } 1661 else 1662 #endif /*SHOPT_FILESCAN */ 1663 if((sh_exec(tt,first)==0)!=(type==TWH)) 1664 break; 1665 r = sh_exec(t->wh.dotre,first|errorflg); 1666 if(shp->st.breakcnt<0) 1667 shp->st.execbrk = (++shp->st.breakcnt !=0); 1668 /* This is for the arithmetic for */ 1669 if(shp->st.execbrk==0 && t->wh.whinc) 1670 sh_exec((Shnode_t*)t->wh.whinc,first); 1671 first = 0; 1672 errorflg &= ~OPTIMIZE_FLAG; 1673 #if SHOPT_FILESCAN 1674 shp->offsets[0] = -1; 1675 shp->offsets[1] = 0; 1676 #endif /*SHOPT_FILESCAN */ 1677 } 1678 #if SHOPT_OPTIMIZE 1679 endwhile: 1680 sh_popcontext(&buff); 1681 sh_tclear(t->wh.whtre); 1682 sh_tclear(t->wh.dotre); 1683 sh_optclear(shp,optlist); 1684 if(jmpval) 1685 siglongjmp(*shp->jmplist,jmpval); 1686 #endif /*SHOPT_OPTIMIZE */ 1687 if(shp->st.breakcnt>0) 1688 shp->st.execbrk = (--shp->st.breakcnt !=0); 1689 shp->st.loopcnt--; 1690 shp->exitval= r; 1691 #if SHOPT_FILESCAN 1692 if(iop) 1693 { 1694 sfclose(iop); 1695 close(0); 1696 dup(savein); 1697 shp->cur_line = 0; 1698 } 1699 #endif /*SHOPT_FILESCAN */ 1700 break; 1701 } 1702 case TARITH: /* (( expression )) */ 1703 { 1704 register char *trap; 1705 char *arg[4]; 1706 error_info.line = t->ar.arline-shp->st.firstline; 1707 arg[0] = "(("; 1708 if(!(t->ar.arexpr->argflag&ARG_RAW)) 1709 arg[1] = sh_macpat(shp,t->ar.arexpr,OPTIMIZE|ARG_ARITH); 1710 else 1711 arg[1] = t->ar.arexpr->argval; 1712 arg[2] = "))"; 1713 arg[3] = 0; 1714 if(trap=shp->st.trap[SH_DEBUGTRAP]) 1715 sh_debug(shp,trap,(char*)0, (char*)0, arg, ARG_ARITH); 1716 if(sh_isoption(SH_XTRACE)) 1717 { 1718 sh_trace(NIL(char**),0); 1719 sfprintf(sfstderr,"((%s))\n",arg[1]); 1720 } 1721 if(t->ar.arcomp) 1722 shp->exitval = !arith_exec((Arith_t*)t->ar.arcomp); 1723 else 1724 shp->exitval = !sh_arith(arg[1]); 1725 break; 1726 } 1727 1728 case TIF: 1729 if(sh_exec(t->if_.iftre,OPTIMIZE)==0) 1730 sh_exec(t->if_.thtre,flags); 1731 else if(t->if_.eltre) 1732 sh_exec(t->if_.eltre, flags); 1733 else 1734 shp->exitval=0; /* force zero exit for if-then-fi */ 1735 break; 1736 1737 case TSW: 1738 { 1739 Shnode_t *tt = (Shnode_t*)t; 1740 char *trap, *r = sh_macpat(shp,tt->sw.swarg,OPTIMIZE); 1741 error_info.line = t->sw.swline-shp->st.firstline; 1742 t= (Shnode_t*)(tt->sw.swlst); 1743 if(trap=shp->st.trap[SH_DEBUGTRAP]) 1744 { 1745 char *av[4]; 1746 av[0] = "case"; 1747 av[1] = r; 1748 av[2] = "in"; 1749 av[3] = 0; 1750 sh_debug(shp,trap, (char*)0, (char*)0, av, 0); 1751 } 1752 while(t) 1753 { 1754 register struct argnod *rex=(struct argnod*)t->reg.regptr; 1755 while(rex) 1756 { 1757 register char *s; 1758 if(rex->argflag&ARG_MAC) 1759 { 1760 s = sh_macpat(shp,rex,OPTIMIZE|ARG_EXP); 1761 while(*s=='\\' && s[1]==0) 1762 s+=2; 1763 } 1764 else 1765 s = rex->argval; 1766 type = (rex->argflag&ARG_RAW); 1767 if((type && strcmp(r,s)==0) || 1768 (!type && (strmatch(r,s) 1769 || trim_eq(r,s)))) 1770 { 1771 do sh_exec(t->reg.regcom,(t->reg.regflag?0:flags)); 1772 while(t->reg.regflag && 1773 (t=(Shnode_t*)t->reg.regnxt)); 1774 t=0; 1775 break; 1776 } 1777 else 1778 rex=rex->argnxt.ap; 1779 } 1780 if(t) 1781 t=(Shnode_t*)t->reg.regnxt; 1782 } 1783 break; 1784 } 1785 1786 case TTIME: 1787 { 1788 /* time the command */ 1789 struct tms before,after; 1790 const char *format = e_timeformat; 1791 clock_t at, tm[3]; 1792 #ifdef timeofday 1793 struct timeval tb,ta; 1794 #else 1795 clock_t bt; 1796 #endif /* timeofday */ 1797 if(type!=TTIME) 1798 { 1799 sh_exec(t->par.partre,OPTIMIZE); 1800 shp->exitval = !shp->exitval; 1801 break; 1802 } 1803 if(t->par.partre) 1804 { 1805 long timer_on; 1806 timer_on = sh_isstate(SH_TIMING); 1807 #ifdef timeofday 1808 timeofday(&tb); 1809 times(&before); 1810 #else 1811 bt = times(&before); 1812 #endif /* timeofday */ 1813 job.waitall = 1; 1814 sh_onstate(SH_TIMING); 1815 sh_exec(t->par.partre,OPTIMIZE); 1816 if(!timer_on) 1817 sh_offstate(SH_TIMING); 1818 job.waitall = 0; 1819 } 1820 else 1821 { 1822 #ifndef timeofday 1823 bt = 0; 1824 #endif /* timeofday */ 1825 before.tms_utime = before.tms_cutime = 0; 1826 before.tms_stime = before.tms_cstime = 0; 1827 } 1828 #ifdef timeofday 1829 times(&after); 1830 timeofday(&ta); 1831 at = shp->lim.clk_tck*(ta.tv_sec-tb.tv_sec); 1832 at += ((shp->lim.clk_tck*(((1000000L/2)/shp->lim.clk_tck)+(ta.tv_usec-tb.tv_usec)))/1000000L); 1833 #else 1834 at = times(&after) - bt; 1835 #endif /* timeofday */ 1836 tm[0] = at; 1837 if(t->par.partre) 1838 { 1839 Namval_t *np = nv_open("TIMEFORMAT",shp->var_tree,NV_NOADD); 1840 if(np) 1841 { 1842 format = nv_getval(np); 1843 nv_close(np); 1844 } 1845 if(!format) 1846 format = e_timeformat; 1847 } 1848 else 1849 format = strchr(format+1,'\n')+1; 1850 tm[1] = after.tms_utime - before.tms_utime; 1851 tm[1] += after.tms_cutime - before.tms_cutime; 1852 tm[2] = after.tms_stime - before.tms_stime; 1853 tm[2] += after.tms_cstime - before.tms_cstime; 1854 if(format && *format) 1855 p_time(shp,sfstderr,sh_translate(format),tm); 1856 break; 1857 } 1858 case TFUN: 1859 { 1860 register Namval_t *np; 1861 register struct slnod *slp; 1862 register char *fname = ((struct functnod*)t)->functnam; 1863 register char *cp = strrchr(fname,'.'); 1864 register Namval_t *npv=0; 1865 #if SHOPT_NAMESPACE 1866 if(t->tre.tretyp==TNSPACE) 1867 { 1868 Dt_t *root,*oldroot, *top=0; 1869 Namval_t *oldnspace = shp->namespace; 1870 int offset = stktell(stkp); 1871 long optindex = shp->st.optindex; 1872 if(cp) 1873 errormsg(SH_DICT,ERROR_exit(1),e_ident,fname); 1874 sfputc(stkp,'.'); 1875 sfputr(stkp,fname,0); 1876 np = nv_open(stkptr(stkp,offset),shp->var_base,NV_NOASSIGN|NV_NOARRAY|NV_VARNAME); 1877 offset = stktell(stkp); 1878 shp->namespace = np; 1879 if(!(root=nv_dict(np))) 1880 { 1881 root = dtopen(&_Nvdisc,Dtoset); 1882 nv_putval(np,(char*)root,NV_TABLE|NV_NOFREE); 1883 shp->st.optindex = 1; 1884 } 1885 if(oldnspace && dtvnext(dtvnext(shp->var_tree))) 1886 top = dtview(shp->var_tree,0); 1887 else if(dtvnext(shp->var_tree)) 1888 top = dtview(shp->var_tree,0); 1889 oldroot = shp->var_tree; 1890 dtview(root,shp->var_base); 1891 shp->var_tree = root; 1892 if(top) 1893 dtview(shp->var_tree,top); 1894 sh_exec(t->for_.fortre,flags); 1895 if(dtvnext(shp->var_tree)) 1896 top = dtview(shp->var_tree,0); 1897 shp->var_tree = oldroot; 1898 if(top) 1899 dtview(top,shp->var_tree); 1900 shp->namespace = oldnspace; 1901 shp->st.optindex = optindex; 1902 break; 1903 } 1904 #endif /* SHOPT_NAMESPACE */ 1905 /* look for discipline functions */ 1906 error_info.line = t->funct.functline-shp->st.firstline; 1907 /* Function names cannot be special builtin */ 1908 if(cp || shp->prefix) 1909 { 1910 int offset = stktell(stkp); 1911 if(shp->prefix) 1912 { 1913 cp = shp->prefix; 1914 shp->prefix = 0; 1915 npv = nv_open(cp,shp->var_tree,NV_NOASSIGN|NV_NOARRAY|NV_VARNAME); 1916 shp->prefix = cp; 1917 cp = fname; 1918 } 1919 else 1920 { 1921 sfwrite(stkp,fname,cp++-fname); 1922 sfputc(stkp,0); 1923 npv = nv_open(stkptr(stkp,offset),shp->var_tree,NV_NOASSIGN|NV_NOARRAY|NV_VARNAME); 1924 } 1925 offset = stktell(stkp); 1926 sfprintf(stkp,"%s.%s%c",nv_name(npv),cp,0); 1927 fname = stkptr(stkp,offset); 1928 } 1929 else if((np=nv_search(fname,shp->bltin_tree,0)) && nv_isattr(np,BLT_SPC)) 1930 errormsg(SH_DICT,ERROR_exit(1),e_badfun,fname); 1931 #if SHOPT_NAMESPACE 1932 else if(shp->namespace) 1933 { 1934 int offset = stktell(stkp); 1935 sfputr(stkp,nv_name(shp->namespace),-1); 1936 sfputc(stkp,'.'); 1937 sfputr(stkp,fname,0); 1938 fname = stkptr(stkp,offset); 1939 } 1940 #endif /* SHOPT_NAMESPACE */ 1941 np = nv_open(fname,sh_subfuntree(1),NV_NOASSIGN|NV_NOARRAY|NV_VARNAME|NV_NOSCOPE); 1942 if(npv) 1943 { 1944 Namval_t *tp = npv; 1945 if(!shp->mktype) 1946 { 1947 if(shp->typeinit) 1948 { 1949 if(tp=nv_open(shp->typeinit->nvname,shp->typedict,NV_IDENT|NV_NOFAIL)) 1950 nv_close(npv); 1951 else 1952 tp = npv; 1953 } 1954 cp = nv_setdisc(tp,cp,np,(Namfun_t*)tp); 1955 } 1956 nv_close(tp); 1957 if(!cp) 1958 errormsg(SH_DICT,ERROR_exit(1),e_baddisc,fname); 1959 } 1960 if(np->nvalue.rp) 1961 { 1962 slp = (struct slnod*)np->nvenv; 1963 sh_funstaks(slp->slchild,-1); 1964 stakdelete(slp->slptr); 1965 if(shp->funload) 1966 { 1967 free((void*)np->nvalue.rp); 1968 np->nvalue.rp = 0; 1969 } 1970 1971 } 1972 if(!np->nvalue.rp) 1973 { 1974 np->nvalue.rp = new_of(struct Ufunction,shp->funload?sizeof(Dtlink_t):0); 1975 memset((void*)np->nvalue.rp,0,sizeof(struct Ufunction)); 1976 } 1977 if(t->funct.functstak) 1978 { 1979 static Dtdisc_t _Rpdisc = 1980 { 1981 offsetof(struct Ufunction,fname), -1, sizeof(struct Ufunction) 1982 }; 1983 struct functnod *fp; 1984 slp = t->funct.functstak; 1985 sh_funstaks(slp->slchild,1); 1986 staklink(slp->slptr); 1987 np->nvenv = (char*)slp; 1988 nv_funtree(np) = (int*)(t->funct.functtre); 1989 np->nvalue.rp->hoffset = t->funct.functloc; 1990 np->nvalue.rp->lineno = t->funct.functline; 1991 np->nvalue.rp->nspace = shp->namespace; 1992 np->nvalue.rp->fname = 0; 1993 np->nvalue.rp->fdict = shp->fun_tree; 1994 fp = (struct functnod*)(slp+1); 1995 if(fp->functtyp==(TFUN|FAMP)) 1996 np->nvalue.rp->fname = fp->functnam; 1997 nv_setsize(np,fp->functline); 1998 nv_offattr(np,NV_FPOSIX); 1999 if(shp->funload) 2000 { 2001 struct Ufunction *rp = np->nvalue.rp; 2002 rp->np = np; 2003 if(!shp->fpathdict) 2004 shp->fpathdict = dtopen(&_Rpdisc,Dtbag); 2005 if(shp->fpathdict) 2006 dtinsert(shp->fpathdict,rp); 2007 } 2008 } 2009 else 2010 nv_unset(np); 2011 if(type&FPOSIX) 2012 nv_onattr(np,NV_FUNCTION|NV_FPOSIX); 2013 else 2014 nv_onattr(np,NV_FUNCTION); 2015 if(type&FPIN) 2016 nv_onattr(np,NV_FTMP); 2017 if(type&FOPTGET) 2018 nv_onattr(np,NV_OPTGET); 2019 break; 2020 } 2021 2022 /* new test compound command */ 2023 case TTST: 2024 { 2025 register int n; 2026 register char *left; 2027 int negate = (type&TNEGATE)!=0; 2028 if(type&TTEST) 2029 skipexitset++; 2030 error_info.line = t->tst.tstline-shp->st.firstline; 2031 echeck = 1; 2032 if((type&TPAREN)==TPAREN) 2033 { 2034 sh_exec(t->lst.lstlef,OPTIMIZE); 2035 n = !shp->exitval; 2036 } 2037 else 2038 { 2039 register int traceon=0; 2040 register char *right; 2041 register char *trap; 2042 char *argv[6]; 2043 n = type>>TSHIFT; 2044 left = sh_macpat(shp,&(t->lst.lstlef->arg),OPTIMIZE); 2045 if(type&TBINARY) 2046 right = sh_macpat(shp,&(t->lst.lstrit->arg),((n==TEST_PEQ||n==TEST_PNE)?ARG_EXP:0)|OPTIMIZE); 2047 if(trap=shp->st.trap[SH_DEBUGTRAP]) 2048 argv[0] = (type&TNEGATE)?((char*)e_tstbegin):"[["; 2049 if(sh_isoption(SH_XTRACE)) 2050 { 2051 traceon = sh_trace(NIL(char**),0); 2052 sfwrite(sfstderr,e_tstbegin,(type&TNEGATE?5:3)); 2053 } 2054 if(type&TUNARY) 2055 { 2056 if(traceon) 2057 sfprintf(sfstderr,"-%c %s",n,sh_fmtq(left)); 2058 if(trap) 2059 { 2060 char unop[3]; 2061 unop[0] = '-'; 2062 unop[1] = n; 2063 unop[2] = 0; 2064 argv[1] = unop; 2065 argv[2] = left; 2066 argv[3] = "]]"; 2067 argv[4] = 0; 2068 sh_debug(shp,trap,(char*)0,(char*)0,argv, 0); 2069 } 2070 n = test_unop(n,left); 2071 } 2072 else if(type&TBINARY) 2073 { 2074 char *op; 2075 int pattern = 0; 2076 if(trap || traceon) 2077 op = (char*)(shtab_testops+(n&037)-1)->sh_name; 2078 type >>= TSHIFT; 2079 if(type==TEST_PEQ || type==TEST_PNE) 2080 pattern=ARG_EXP; 2081 if(trap) 2082 { 2083 argv[1] = left; 2084 argv[2] = op; 2085 argv[3] = right; 2086 argv[4] = "]]"; 2087 argv[5] = 0; 2088 sh_debug(shp,trap,(char*)0,(char*)0,argv, pattern); 2089 } 2090 n = test_binop(n,left,right); 2091 if(traceon) 2092 { 2093 sfprintf(sfstderr,"%s %s ",sh_fmtq(left),op); 2094 if(pattern) 2095 out_pattern(sfstderr,right,-1); 2096 else 2097 sfputr(sfstderr,sh_fmtq(right),-1); 2098 } 2099 } 2100 if(traceon) 2101 sfwrite(sfstderr,e_tstend,4); 2102 } 2103 shp->exitval = ((!n)^negate); 2104 if(!skipexitset) 2105 exitset(); 2106 break; 2107 } 2108 } 2109 if(shp->trapnote || (shp->exitval && sh_isstate(SH_ERREXIT)) && 2110 t && echeck) 2111 sh_chktrap(); 2112 /* set $_ */ 2113 if(mainloop && com0) 2114 { 2115 /* store last argument here if it fits */ 2116 static char lastarg[32]; 2117 if(sh_isstate(SH_FORKED)) 2118 sh_done(shp,0); 2119 if(shp->lastarg!= lastarg && shp->lastarg) 2120 free(shp->lastarg); 2121 if(strlen(comn) < sizeof(lastarg)) 2122 { 2123 nv_onattr(L_ARGNOD,NV_NOFREE); 2124 shp->lastarg = strcpy(lastarg,comn); 2125 } 2126 else 2127 { 2128 nv_offattr(L_ARGNOD,NV_NOFREE); 2129 shp->lastarg = strdup(comn); 2130 } 2131 } 2132 if(!skipexitset) 2133 exitset(); 2134 if(!(OPTIMIZE)) 2135 { 2136 if(sav != stkptr(stkp,0)) 2137 stkset(stkp,sav,0); 2138 else if(stktell(stkp)) 2139 stkseek(stkp,0); 2140 } 2141 if(shp->trapnote&SH_SIGSET) 2142 sh_exit(SH_EXITSIG|shp->lastsig); 2143 if(was_interactive) 2144 sh_onstate(SH_INTERACTIVE); 2145 if(was_monitor && sh_isoption(SH_MONITOR)) 2146 sh_onstate(SH_MONITOR); 2147 if(was_errexit) 2148 sh_onstate(SH_ERREXIT); 2149 } 2150 return(shp->exitval); 2151 } 2152 2153 int sh_run(int argn, char *argv[]) 2154 { 2155 register struct dolnod *dp; 2156 register struct comnod *t = (struct comnod*)stakalloc(sizeof(struct comnod)); 2157 int savtop = staktell(); 2158 char *savptr = stakfreeze(0); 2159 Opt_t *op, *np = optctx(0, 0); 2160 Shbltin_t bltindata; 2161 bltindata = sh.bltindata; 2162 op = optctx(np, 0); 2163 memset(t, 0, sizeof(struct comnod)); 2164 dp = (struct dolnod*)stakalloc((unsigned)sizeof(struct dolnod) + ARG_SPARE*sizeof(char*) + argn*sizeof(char*)); 2165 dp->dolnum = argn; 2166 dp->dolbot = ARG_SPARE; 2167 memcpy(dp->dolval+ARG_SPARE, argv, (argn+1)*sizeof(char*)); 2168 t->comarg = (struct argnod*)dp; 2169 if(!strchr(argv[0],'/')) 2170 t->comnamp = (void*)nv_bfsearch(argv[0],sh.fun_tree,(Namval_t**)&t->comnamq,(char**)0); 2171 argn=sh_exec((Shnode_t*)t,sh_isstate(SH_ERREXIT)); 2172 optctx(op,np); 2173 sh.bltindata = bltindata; 2174 if(savptr!=stakptr(0)) 2175 stakset(savptr,savtop); 2176 else 2177 stakseek(savtop); 2178 return(argn); 2179 } 2180 2181 /* 2182 * test for equality with second argument trimmed 2183 * returns 1 if r == trim(s) otherwise 0 2184 */ 2185 2186 static int trim_eq(register const char *r,register const char *s) 2187 { 2188 register char c; 2189 while(c = *s++) 2190 { 2191 if(c=='\\') 2192 c = *s++; 2193 if(c && c != *r++) 2194 return(0); 2195 } 2196 return(*r==0); 2197 } 2198 2199 /* 2200 * print out the command line if set -x is on 2201 */ 2202 2203 int sh_trace(register char *argv[], register int nl) 2204 { 2205 Shell_t *shp = &sh; 2206 register char *cp; 2207 register int bracket = 0; 2208 int decl = (nl&2); 2209 nl &= ~2; 2210 if(sh_isoption(SH_XTRACE)) 2211 { 2212 /* make this trace atomic */ 2213 sfset(sfstderr,SF_SHARE|SF_PUBLIC,0); 2214 if(!(cp=nv_getval(sh_scoped(shp,PS4NOD)))) 2215 cp = "+ "; 2216 else 2217 { 2218 sh_offoption(SH_XTRACE); 2219 cp = sh_mactry(shp,cp); 2220 sh_onoption(SH_XTRACE); 2221 } 2222 if(*cp) 2223 sfputr(sfstderr,cp,-1); 2224 if(argv) 2225 { 2226 char *argv0 = *argv; 2227 nl = (nl?'\n':-1); 2228 /* don't quote [ and [[ */ 2229 if(*(cp=argv[0])=='[' && (!cp[1] || !cp[2]&&cp[1]=='[')) 2230 { 2231 sfputr(sfstderr,cp,*++argv?' ':nl); 2232 bracket = 1; 2233 } 2234 while(cp = *argv++) 2235 { 2236 if(bracket==0 || *argv || *cp!=']') 2237 cp = sh_fmtq(cp); 2238 if(decl && shp->prefix && cp!=argv0 && *cp!='-') 2239 { 2240 if(*cp=='.' && cp[1]==0) 2241 cp = shp->prefix; 2242 else 2243 sfputr(sfstderr,shp->prefix,'.'); 2244 } 2245 sfputr(sfstderr,cp,*argv?' ':nl); 2246 } 2247 sfset(sfstderr,SF_SHARE|SF_PUBLIC,1); 2248 } 2249 return(1); 2250 } 2251 return(0); 2252 } 2253 2254 /* 2255 * This routine creates a subshell by calling fork() or vfork() 2256 * If ((flags&COMASK)==TCOM), then vfork() is permitted 2257 * If fork fails, the shell sleeps for exponentially longer periods 2258 * and tries again until a limit is reached. 2259 * SH_FORKLIM is the max period between forks - power of 2 usually. 2260 * Currently shell tries after 2,4,8,16, and 32 seconds and then quits 2261 * Failures cause the routine to error exit. 2262 * Parent links to here-documents are removed by the child 2263 * Traps are reset by the child 2264 * The process-id of the child is returned to the parent, 0 to the child. 2265 */ 2266 2267 static void timed_out(void *handle) 2268 { 2269 NOT_USED(handle); 2270 timeout = 0; 2271 } 2272 2273 2274 /* 2275 * called by parent and child after fork by sh_fork() 2276 */ 2277 pid_t _sh_fork(register pid_t parent,int flags,int *jobid) 2278 { 2279 static long forkcnt = 1000L; 2280 Shell_t *shp = &sh; 2281 pid_t curpgid = job.curpgid; 2282 pid_t postid = (flags&FAMP)?0:curpgid; 2283 int sig,nochild; 2284 if(parent<0) 2285 { 2286 sh_sigcheck(); 2287 if((forkcnt *= 2) > 1000L*SH_FORKLIM) 2288 { 2289 forkcnt=1000L; 2290 errormsg(SH_DICT,ERROR_system(ERROR_NOEXEC),e_nofork); 2291 } 2292 timeout = (void*)sh_timeradd(forkcnt, 0, timed_out, NIL(void*)); 2293 nochild = job_wait((pid_t)1); 2294 if(timeout) 2295 { 2296 if(nochild) 2297 pause(); 2298 else if(forkcnt>1000L) 2299 forkcnt /= 2; 2300 timerdel(timeout); 2301 timeout = 0; 2302 } 2303 return(-1); 2304 } 2305 forkcnt = 1000L; 2306 if(parent) 2307 { 2308 int myjob,waitall=job.waitall; 2309 shp->nforks++; 2310 if(job.toclear) 2311 job_clear(); 2312 job.waitall = waitall; 2313 #ifdef JOBS 2314 /* first process defines process group */ 2315 if(sh_isstate(SH_MONITOR)) 2316 { 2317 /* 2318 * errno==EPERM means that an earlier processes 2319 * completed. Make parent the job group id. 2320 */ 2321 if(postid==0) 2322 job.curpgid = parent; 2323 if(job.jobcontrol || (flags&FAMP)) 2324 { 2325 if(setpgid(parent,job.curpgid)<0 && errno==EPERM) 2326 setpgid(parent,parent); 2327 } 2328 } 2329 #endif /* JOBS */ 2330 if(!sh_isstate(SH_MONITOR) && job.waitall && postid==0) 2331 job.curpgid = parent; 2332 if(flags&FCOOP) 2333 shp->cpid = parent; 2334 myjob = job_post(parent,postid); 2335 if(flags&FAMP) 2336 job.curpgid = curpgid; 2337 if(jobid) 2338 *jobid = myjob; 2339 return(parent); 2340 } 2341 #if !_std_malloc 2342 vmtrace(-1); 2343 #endif 2344 /* This is the child process */ 2345 if(shp->trapnote&SH_SIGTERM) 2346 sh_exit(SH_EXITSIG|SIGTERM); 2347 shp->nforks=0; 2348 timerdel(NIL(void*)); 2349 #ifdef JOBS 2350 if(!job.jobcontrol && !(flags&FAMP)) 2351 sh_offstate(SH_MONITOR); 2352 if(sh_isstate(SH_MONITOR)) 2353 { 2354 parent = getpid(); 2355 if(postid==0) 2356 job.curpgid = parent; 2357 while(setpgid(0,job.curpgid)<0 && job.curpgid!=parent) 2358 job.curpgid = parent; 2359 # ifdef SIGTSTP 2360 if(job.curpgid==parent && !(flags&FAMP)) 2361 tcsetpgrp(job.fd,job.curpgid); 2362 # endif /* SIGTSTP */ 2363 } 2364 # ifdef SIGTSTP 2365 if(job.jobcontrol) 2366 { 2367 signal(SIGTTIN,SIG_DFL); 2368 signal(SIGTTOU,SIG_DFL); 2369 signal(SIGTSTP,SIG_DFL); 2370 } 2371 # endif /* SIGTSTP */ 2372 job.jobcontrol = 0; 2373 #endif /* JOBS */ 2374 job.toclear = 1; 2375 shp->login_sh = 0; 2376 sh_offoption(SH_LOGIN_SHELL); 2377 sh_onstate(SH_FORKED); 2378 sh_onstate(SH_NOLOG); 2379 if (shp->fn_reset) 2380 shp->fn_depth = shp->fn_reset = 0; 2381 #if SHOPT_ACCT 2382 sh_accsusp(); 2383 #endif /* SHOPT_ACCT */ 2384 /* Reset remaining signals to parent */ 2385 /* except for those `lost' by trap */ 2386 sh_sigreset(2); 2387 shp->subshell = 0; 2388 if((flags&FAMP) && shp->coutpipe>1) 2389 sh_close(shp->coutpipe); 2390 sig = shp->savesig; 2391 shp->savesig = 0; 2392 if(sig>0) 2393 sh_fault(sig); 2394 sh_sigcheck(); 2395 return(0); 2396 } 2397 2398 pid_t sh_fork(int flags, int *jobid) 2399 { 2400 register pid_t parent; 2401 register int sig; 2402 #if SHOPT_FASTPIPE 2403 if(sffileno(sfstdin)<0) 2404 { 2405 off_t current = sfseek(sfstdin,(off_t)0,SEEK_CUR); 2406 sfseek(sfstdin,(off_t)0,SEEK_END); 2407 sfdisc(sfstdin,SF_POPDISC); 2408 fcntl(sffileno(sfstdin),F_SETFD,0); 2409 sh_iostream(0); 2410 sfseek(sfstdin,current,SEEK_SET); 2411 } 2412 #endif /* SHOPT_FASTPIPE */ 2413 if(!sh.pathlist) 2414 path_get(""); 2415 sfsync(NIL(Sfio_t*)); 2416 sh.trapnote &= ~SH_SIGTERM; 2417 job_fork(-1); 2418 sh.savesig = -1; 2419 while(_sh_fork(parent=fork(),flags,jobid) < 0); 2420 sh_stats(STAT_FORKS); 2421 sig = sh.savesig; 2422 sh.savesig = 0; 2423 if(sig>0) 2424 sh_fault(sig); 2425 job_fork(parent); 2426 return(parent); 2427 } 2428 2429 /* 2430 * add exports from previous scope to the new scope 2431 */ 2432 static void local_exports(register Namval_t *np, void *data) 2433 { 2434 register Namval_t *mp; 2435 register char *cp; 2436 if(nv_isarray(np)) 2437 nv_putsub(np,NIL(char*),0); 2438 if((cp = nv_getval(np)) && (mp = nv_search(nv_name(np), sh.var_tree, NV_ADD|HASH_NOSCOPE)) && nv_isnull(mp)) 2439 nv_putval(mp, cp, 0); 2440 } 2441 2442 /* 2443 * This routine is used to execute the given function <fun> in a new scope 2444 * If <fun> is NULL, then arg points to a structure containing a pointer 2445 * to a function that will be executed in the current environment. 2446 */ 2447 int sh_funscope(int argn, char *argv[],int(*fun)(void*),void *arg,int execflg) 2448 { 2449 register char *trap; 2450 register int nsig; 2451 register Shell_t *shp = &sh; 2452 struct dolnod *argsav=0,*saveargfor; 2453 struct sh_scoped savst, *prevscope = shp->st.self; 2454 struct argnod *envlist=0; 2455 int jmpval; 2456 volatile int r = 0; 2457 char *savstak; 2458 struct funenv *fp; 2459 struct checkpt buff; 2460 Namval_t *nspace = shp->namespace; 2461 if(shp->fn_depth==0) 2462 shp->glob_options = shp->options; 2463 else 2464 shp->options = shp->glob_options; 2465 #if 0 2466 shp->st.lineno = error_info.line; 2467 #endif 2468 *prevscope = shp->st; 2469 sh_offoption(SH_ERREXIT); 2470 shp->st.prevst = prevscope; 2471 shp->st.self = &savst; 2472 shp->topscope = (Shscope_t*)shp->st.self; 2473 shp->st.opterror = shp->st.optchar = 0; 2474 shp->st.optindex = 1; 2475 shp->st.loopcnt = 0; 2476 if(!fun) 2477 { 2478 fp = (struct funenv*)arg; 2479 shp->st.real_fun = (fp->node)->nvalue.rp; 2480 envlist = fp->env; 2481 } 2482 prevscope->save_tree = shp->var_tree; 2483 sh_scope(shp,envlist,1); 2484 if(dtvnext(prevscope->save_tree)!= (shp->namespace?shp->var_base:0)) 2485 { 2486 /* eliminate parent scope */ 2487 nv_scan(prevscope->save_tree, local_exports,(void*)0, NV_EXPORT, NV_EXPORT|NV_NOSCOPE); 2488 } 2489 shp->st.save_tree = shp->var_tree; 2490 if(!fun) 2491 { 2492 Namval_t *np; 2493 if(nv_isattr(fp->node,NV_TAGGED)) 2494 sh_onoption(SH_XTRACE); 2495 else 2496 sh_offoption(SH_XTRACE); 2497 #if SHOPT_NAMESPACE 2498 if((np=(fp->node)->nvalue.rp->nspace) && np!=shp->namespace) 2499 { 2500 Dt_t *dt = shp->var_tree; 2501 dtview(dt,0); 2502 dtview(dt,nv_dict(np)); 2503 shp->var_tree = nv_dict(np); 2504 shp->namespace = np; 2505 } 2506 #endif /* SHOPT_NAMESPACE */ 2507 } 2508 shp->st.cmdname = argv[0]; 2509 /* save trap table */ 2510 if((nsig=shp->st.trapmax*sizeof(char*))>0 || shp->st.trapcom[0]) 2511 { 2512 nsig += sizeof(char*); 2513 memcpy(savstak=stakalloc(nsig),(char*)&shp->st.trapcom[0],nsig); 2514 } 2515 sh_sigreset(0); 2516 argsav = sh_argnew(shp,argv,&saveargfor); 2517 sh_pushcontext(&buff,SH_JMPFUN); 2518 errorpush(&buff.err,0); 2519 error_info.id = argv[0]; 2520 shp->st.var_local = shp->var_tree; 2521 jmpval = sigsetjmp(buff.buff,0); 2522 if(!fun) 2523 { 2524 shp->st.filename = fp->node->nvalue.rp->fname; 2525 shp->st.funname = nv_name(fp->node); 2526 nv_putval(SH_PATHNAMENOD,shp->st.filename,NV_NOFREE); 2527 nv_putval(SH_FUNNAMENOD,shp->st.funname,NV_NOFREE); 2528 } 2529 if(jmpval == 0) 2530 { 2531 if(shp->fn_depth++ > MAXDEPTH) 2532 siglongjmp(*shp->jmplist,SH_JMPERRFN); 2533 else if(fun) 2534 r= (*fun)(arg); 2535 else 2536 { 2537 sh_exec((Shnode_t*)(nv_funtree((fp->node))),execflg|SH_ERREXIT); 2538 r = shp->exitval; 2539 } 2540 } 2541 if(--shp->fn_depth==1 && jmpval==SH_JMPERRFN) 2542 errormsg(SH_DICT,ERROR_exit(1),e_toodeep,argv[0]); 2543 sh_popcontext(&buff); 2544 if (shp->st.self != &savst) 2545 shp->var_tree = (Dt_t*)savst.save_tree; 2546 sh_unscope(shp); 2547 shp->namespace = nspace; 2548 shp->var_tree = (Dt_t*)prevscope->save_tree; 2549 if(shp->topscope != (Shscope_t*)shp->st.self) 2550 sh_setscope(shp->topscope); 2551 sh_argreset(shp,argsav,saveargfor); 2552 trap = shp->st.trapcom[0]; 2553 shp->st.trapcom[0] = 0; 2554 sh_sigreset(1); 2555 if (shp->st.self != &savst) 2556 *shp->st.self = shp->st; 2557 shp->st = *prevscope; 2558 shp->topscope = (Shscope_t*)prevscope; 2559 nv_getval(sh_scoped(shp,IFSNOD)); 2560 if(nsig) 2561 memcpy((char*)&shp->st.trapcom[0],savstak,nsig); 2562 shp->trapnote=0; 2563 if(nsig) 2564 stakset(savstak,0); 2565 shp->options = shp->glob_options; 2566 if(trap) 2567 { 2568 sh_trap(trap,0); 2569 free(trap); 2570 } 2571 if(shp->exitval > SH_EXITSIG) 2572 sh_fault(shp->exitval&SH_EXITMASK); 2573 if(jmpval > SH_JMPFUN) 2574 { 2575 sh_chktrap(); 2576 siglongjmp(*shp->jmplist,jmpval); 2577 } 2578 return(r); 2579 } 2580 2581 static void sh_funct(Shell_t *shp,Namval_t *np,int argn, char *argv[],struct argnod *envlist,int execflg) 2582 { 2583 struct funenv fun; 2584 char *fname = nv_getval(SH_FUNNAMENOD); 2585 struct Level *lp =(struct Level*)(SH_LEVELNOD->nvfun); 2586 int level; 2587 sh_stats(STAT_FUNCT); 2588 if(!lp->hdr.disc) 2589 lp = init_level(0); 2590 if((struct sh_scoped*)shp->topscope != shp->st.self) 2591 sh_setscope(shp->topscope); 2592 level = lp->maxlevel = shp->dot_depth + shp->fn_depth+1; 2593 SH_LEVELNOD->nvalue.s = lp->maxlevel; 2594 shp->st.lineno = error_info.line; 2595 if(nv_isattr(np,NV_FPOSIX)) 2596 { 2597 char *save; 2598 int loopcnt = shp->st.loopcnt; 2599 shp->posix_fun = np; 2600 save = argv[-1]; 2601 argv[-1] = 0; 2602 shp->st.funname = nv_name(np); 2603 nv_putval(SH_FUNNAMENOD, nv_name(np),NV_NOFREE); 2604 opt_info.index = opt_info.offset = 0; 2605 error_info.errors = 0; 2606 shp->st.loopcnt = 0; 2607 b_dot_cmd(argn+1,argv-1,&shp->bltindata); 2608 shp->st.loopcnt = loopcnt; 2609 argv[-1] = save; 2610 } 2611 else 2612 { 2613 fun.env = envlist; 2614 fun.node = np; 2615 sh_funscope(argn,argv,0,&fun,execflg); 2616 } 2617 if(level-- != nv_getnum(SH_LEVELNOD)) 2618 { 2619 Shscope_t *sp = sh_getscope(0,SEEK_END); 2620 sh_setscope(sp); 2621 } 2622 lp->maxlevel = level; 2623 SH_LEVELNOD->nvalue.s = lp->maxlevel; 2624 #if 0 2625 nv_putval(SH_FUNNAMENOD,shp->st.funname,NV_NOFREE); 2626 #else 2627 nv_putval(SH_FUNNAMENOD,fname,NV_NOFREE); 2628 #endif 2629 nv_putval(SH_PATHNAMENOD,shp->st.filename,NV_NOFREE); 2630 } 2631 2632 /* 2633 * external interface to execute a function without arguments 2634 * <np> is the function node 2635 * If <nq> is not-null, then sh.name and sh.subscript will be set 2636 */ 2637 int sh_fun(Namval_t *np, Namval_t *nq, char *argv[]) 2638 { 2639 Shell_t *shp = &sh; 2640 register int offset; 2641 register char *base; 2642 Namval_t node; 2643 struct Namref nr; 2644 long mode; 2645 char *prefix = shp->prefix; 2646 int n=0; 2647 char *av[2]; 2648 Fcin_t save; 2649 fcsave(&save); 2650 if((offset=staktell())>0) 2651 base=stakfreeze(0); 2652 shp->prefix = 0; 2653 if(!argv) 2654 { 2655 argv = av; 2656 argv[1]=0; 2657 } 2658 argv[0] = nv_name(np); 2659 while(argv[n]) 2660 n++; 2661 if(nq) 2662 mode = set_instance(nq,&node, &nr); 2663 if(is_abuiltin(np)) 2664 { 2665 int jmpval; 2666 struct checkpt buff; 2667 Shbltin_t *bp = &sh.bltindata; 2668 sh_pushcontext(&buff,SH_JMPCMD); 2669 jmpval = sigsetjmp(buff.buff,1); 2670 if(jmpval == 0) 2671 { 2672 bp->bnode = np; 2673 bp->ptr = nv_context(np); 2674 errorpush(&buff.err,0); 2675 error_info.id = argv[0]; 2676 opt_info.index = opt_info.offset = 0; 2677 opt_info.disc = 0; 2678 sh.exitval = 0; 2679 sh.exitval = (*funptr(np))(n,argv,(void*)bp); 2680 } 2681 sh_popcontext(&buff); 2682 if(jmpval>SH_JMPCMD) 2683 siglongjmp(*sh.jmplist,jmpval); 2684 } 2685 else 2686 sh_funct(shp,np,n,argv,(struct argnod*)0,sh_isstate(SH_ERREXIT)); 2687 if(nq) 2688 unset_instance(nq, &node, &nr, mode); 2689 fcrestore(&save); 2690 if(offset>0) 2691 stakset(base,offset); 2692 shp->prefix = prefix; 2693 return(sh.exitval); 2694 } 2695 2696 /* 2697 * This dummy routine is called by built-ins that do recursion 2698 * on the file system (chmod, chgrp, chown). It causes 2699 * the shell to invoke the non-builtin version in this case 2700 */ 2701 int cmdrecurse(int argc, char* argv[], int ac, char* av[]) 2702 { 2703 NOT_USED(argc); 2704 NOT_USED(argv[0]); 2705 NOT_USED(ac); 2706 NOT_USED(av[0]); 2707 return(SH_RUNPROG); 2708 } 2709 2710 /* 2711 * set up pipe for cooperating process 2712 */ 2713 static void coproc_init(Shell_t *shp, int pipes[]) 2714 { 2715 int outfd; 2716 if(shp->coutpipe>=0 && shp->cpid) 2717 errormsg(SH_DICT,ERROR_exit(1),e_pexists); 2718 shp->cpid = 0; 2719 if(shp->cpipe[0]<=0 || shp->cpipe[1]<=0) 2720 { 2721 /* first co-process */ 2722 sh_pclose(shp->cpipe); 2723 sh_pipe(shp->cpipe); 2724 if((outfd=shp->cpipe[1]) < 10) 2725 { 2726 int fd=fcntl(shp->cpipe[1],F_DUPFD,10); 2727 if(fd>=10) 2728 { 2729 shp->fdstatus[fd] = (shp->fdstatus[outfd]&~IOCLEX); 2730 close(outfd); 2731 shp->fdstatus[outfd] = IOCLOSE; 2732 shp->cpipe[1] = fd; 2733 } 2734 } 2735 if(fcntl(*shp->cpipe,F_SETFD,FD_CLOEXEC)>=0) 2736 shp->fdstatus[shp->cpipe[0]] |= IOCLEX; 2737 shp->fdptrs[shp->cpipe[0]] = shp->cpipe; 2738 2739 if(fcntl(shp->cpipe[1],F_SETFD,FD_CLOEXEC) >=0) 2740 shp->fdstatus[shp->cpipe[1]] |= IOCLEX; 2741 } 2742 shp->outpipe = shp->cpipe; 2743 sh_pipe(shp->inpipe=pipes); 2744 shp->coutpipe = shp->inpipe[1]; 2745 shp->fdptrs[shp->coutpipe] = &shp->coutpipe; 2746 if(fcntl(shp->outpipe[0],F_SETFD,FD_CLOEXEC)>=0) 2747 shp->fdstatus[shp->outpipe[0]] |= IOCLEX; 2748 } 2749 2750 #if SHOPT_SPAWN 2751 2752 2753 #if SHOPT_AMP || !defined(_lib_fork) 2754 /* 2755 * print out function definition 2756 */ 2757 static void print_fun(register Namval_t* np, void *data) 2758 { 2759 register char *format; 2760 NOT_USED(data); 2761 if(!is_afunction(np) || !np->nvalue.ip) 2762 return; 2763 if(nv_isattr(np,NV_FPOSIX)) 2764 format="%s()\n{ "; 2765 else 2766 format="function %s\n{ "; 2767 sfprintf(sfstdout,format,nv_name(np)); 2768 sh_deparse(sfstdout,(Shnode_t*)(nv_funtree(np)),0); 2769 sfwrite(sfstdout,"}\n",2); 2770 } 2771 2772 /* 2773 * create a shell script consisting of t->fork.forktre and execute it 2774 */ 2775 static int run_subshell(const Shnode_t *t,pid_t grp) 2776 { 2777 static const char prolog[] = "(print $(typeset +A);set; typeset -p; print .sh.dollar=$$;set +o)"; 2778 register int i, fd, trace = sh_isoption(SH_XTRACE); 2779 int pin,pout; 2780 pid_t pid; 2781 char *arglist[2], *envlist[2], devfd[12], *cp; 2782 Sfio_t *sp = sftmp(0); 2783 envlist[0] = "_=" SH_ID; 2784 envlist[1] = 0; 2785 arglist[0] = error_info.id?error_info.id:sh.shname; 2786 if(*arglist[0]=='-') 2787 arglist[0]++; 2788 arglist[1] = devfd; 2789 strncpy(devfd,e_devfdNN,sizeof(devfd)); 2790 arglist[2] = 0; 2791 sfstack(sfstdout,sp); 2792 if(trace) 2793 sh_offoption(SH_XTRACE); 2794 sfwrite(sfstdout,"typeset -A -- ",14); 2795 sh_trap(prolog,0); 2796 nv_scan(sh.fun_tree, print_fun, (void*)0,0, 0); 2797 if(sh.st.dolc>0) 2798 { 2799 /* pass the positional parameters */ 2800 char **argv = sh.st.dolv+1; 2801 sfwrite(sfstdout,"set --",6); 2802 while(*argv) 2803 sfprintf(sfstdout," %s",sh_fmtq(*argv++)); 2804 sfputc(sfstdout,'\n'); 2805 } 2806 pin = (sh.inpipe?sh.inpipe[1]:0); 2807 pout = (sh.outpipe?sh.outpipe[0]:0); 2808 for(i=3; i < 10; i++) 2809 { 2810 if(sh.fdstatus[i]&IOCLEX && i!=pin && i!=pout) 2811 { 2812 sfprintf(sfstdout,"exec %d<&%d\n",i,i); 2813 fcntl(i,F_SETFD,0); 2814 } 2815 } 2816 sfprintf(sfstdout,"LINENO=%d\n",t->fork.forkline); 2817 if(trace) 2818 { 2819 sfwrite(sfstdout,"set -x\n",7); 2820 sh_onoption(SH_XTRACE); 2821 } 2822 sfstack(sfstdout,NIL(Sfio_t*)); 2823 sh_deparse(sp,t->fork.forktre,0); 2824 sfseek(sp,(Sfoff_t)0,SEEK_SET); 2825 fd = sh_dup(sffileno(sp)); 2826 cp = devfd+8; 2827 if(fd>9) 2828 *cp++ = '0' + (fd/10); 2829 *cp++ = '0' + fd%10; 2830 *cp = 0; 2831 sfclose(sp); 2832 sfsync(NIL(Sfio_t*)); 2833 if(!sh.shpath) 2834 sh.shpath = pathshell(); 2835 pid = spawnveg(sh.shpath,arglist,envlist,grp); 2836 close(fd); 2837 for(i=3; i < 10; i++) 2838 { 2839 if(sh.fdstatus[i]&IOCLEX && i!=pin && i!=pout) 2840 fcntl(i,F_SETFD,FD_CLOEXEC); 2841 } 2842 if(pid <=0) 2843 errormsg(SH_DICT,ERROR_system(ERROR_NOEXEC),e_exec,arglist[0]); 2844 return(pid); 2845 } 2846 #endif /* !_lib_fork */ 2847 2848 static void sigreset(int mode) 2849 { 2850 register char *trap; 2851 register int sig=sh.st.trapmax; 2852 while(sig-- > 0) 2853 { 2854 if((trap=sh.st.trapcom[sig]) && *trap==0) 2855 signal(sig,mode?sh_fault:SIG_IGN); 2856 } 2857 } 2858 2859 /* 2860 * A combined fork/exec for systems with slow or non-existent fork() 2861 */ 2862 static pid_t sh_ntfork(Shell_t *shp,const Shnode_t *t,char *argv[],int *jobid,int flag) 2863 { 2864 static pid_t spawnpid; 2865 static int savetype; 2866 static int savejobid; 2867 struct checkpt buff; 2868 int otype=0, jmpval; 2869 volatile int jobwasset=0, scope=0, sigwasset=0; 2870 char **arge, *path; 2871 volatile pid_t grp = 0; 2872 Pathcomp_t *pp; 2873 if(flag) 2874 { 2875 otype = savetype; 2876 savetype=0; 2877 } 2878 # if SHOPT_AMP || !defined(_lib_fork) 2879 if(!argv) 2880 { 2881 register Shnode_t *tchild = t->fork.forktre; 2882 int optimize=0; 2883 otype = t->tre.tretyp; 2884 savetype = otype; 2885 spawnpid = 0; 2886 # ifndef _lib_fork 2887 if((tchild->tre.tretyp&COMMSK)==TCOM) 2888 { 2889 Namval_t *np = (Namval_t*)(tchild->com.comnamp); 2890 if(np) 2891 { 2892 path = nv_name(np); 2893 if(!nv_isattr(np,BLT_ENV)) 2894 np=0; 2895 else if(strcmp(path,"echo")==0 || memcmp(path,"print",5)==0) 2896 np=0; 2897 } 2898 else if(!tchild->com.comarg) 2899 optimize=1; 2900 else if(tchild->com.comtyp&COMSCAN) 2901 { 2902 if(tchild->com.comarg->argflag&ARG_RAW) 2903 path = tchild->com.comarg->argval; 2904 else 2905 path = 0; 2906 } 2907 else 2908 path = ((struct dolnod*)tchild->com.comarg)->dolval[ARG_SPARE]; 2909 if(!np && path && !nv_search(path,shp->fun_tree,0)) 2910 optimize=1; 2911 } 2912 # endif 2913 sh_pushcontext(&buff,SH_JMPIO); 2914 jmpval = sigsetjmp(buff.buff,0); 2915 { 2916 if((otype&FINT) && !sh_isstate(SH_MONITOR)) 2917 { 2918 signal(SIGQUIT,SIG_IGN); 2919 signal(SIGINT,SIG_IGN); 2920 if(!shp->st.ioset) 2921 { 2922 sh_iosave(shp,0,buff.topfd,(char*)0); 2923 sh_iorenumber(shp,sh_chkopen(e_devnull),0); 2924 } 2925 } 2926 if(otype&FPIN) 2927 { 2928 int fd = shp->inpipe[1]; 2929 sh_iosave(shp,0,buff.topfd,(char*)0); 2930 sh_iorenumber(shp,shp->inpipe[0],0); 2931 if(fd>=0 && (!(otype&FPOU) || (otype&FCOOP)) && fcntl(fd,F_SETFD,FD_CLOEXEC)>=0) 2932 shp->fdstatus[fd] |= IOCLEX; 2933 } 2934 if(otype&FPOU) 2935 { 2936 sh_iosave(shp,1,buff.topfd,(char*)0); 2937 sh_iorenumber(shp,sh_dup(shp->outpipe[1]),1); 2938 if(fcntl(shp->outpipe[0],F_SETFD,FD_CLOEXEC)>=0) 2939 shp->fdstatus[shp->outpipe[0]] |= IOCLEX; 2940 } 2941 2942 if(t->fork.forkio) 2943 sh_redirect(shp,t->fork.forkio,0); 2944 if(optimize==0) 2945 { 2946 #ifdef SIGTSTP 2947 if(job.jobcontrol) 2948 { 2949 signal(SIGTTIN,SIG_DFL); 2950 signal(SIGTTOU,SIG_DFL); 2951 } 2952 #endif /* SIGTSTP */ 2953 #ifdef JOBS 2954 if(sh_isstate(SH_MONITOR) && (job.jobcontrol || (otype&FAMP))) 2955 { 2956 if((otype&FAMP) || job.curpgid==0) 2957 grp = 1; 2958 else 2959 grp = job.curpgid; 2960 } 2961 #endif /* JOBS */ 2962 spawnpid = run_subshell(t,grp); 2963 } 2964 else 2965 { 2966 sh_exec(tchild,SH_NTFORK); 2967 if(jobid) 2968 *jobid = savejobid; 2969 } 2970 } 2971 sh_popcontext(&buff); 2972 if((otype&FINT) && !sh_isstate(SH_MONITOR)) 2973 { 2974 signal(SIGQUIT,sh_fault); 2975 signal(SIGINT,sh_fault); 2976 } 2977 if((otype&FPIN) && (!(otype&FPOU) || (otype&FCOOP)) && fcntl(shp->inpipe[1],F_SETFD,FD_CLOEXEC)>=0) 2978 shp->fdstatus[shp->inpipe[1]] &= ~IOCLEX; 2979 if(t->fork.forkio || otype) 2980 sh_iorestore(shp,buff.topfd,jmpval); 2981 if(optimize==0) 2982 { 2983 #ifdef SIGTSTP 2984 if(job.jobcontrol) 2985 { 2986 signal(SIGTTIN,SIG_IGN); 2987 signal(SIGTTOU,SIG_IGN); 2988 } 2989 #endif /* SIGTSTP */ 2990 if(spawnpid>0) 2991 _sh_fork(spawnpid,otype,jobid); 2992 if(grp>0 && !(otype&FAMP)) 2993 { 2994 while(tcsetpgrp(job.fd,job.curpgid)<0 && job.curpgid!=spawnpid) 2995 job.curpgid = spawnpid; 2996 } 2997 } 2998 savetype=0; 2999 if(jmpval>SH_JMPIO) 3000 siglongjmp(*shp->jmplist,jmpval); 3001 if(spawnpid<0 && (otype&FCOOP)) 3002 { 3003 sh_close(shp->coutpipe); 3004 sh_close(shp->cpipe[1]); 3005 shp->cpipe[1] = -1; 3006 shp->coutpipe = -1; 3007 } 3008 shp->exitval = 0; 3009 return(spawnpid); 3010 } 3011 # endif /* !_lib_fork */ 3012 sh_pushcontext(&buff,SH_JMPCMD); 3013 errorpush(&buff.err,ERROR_SILENT); 3014 jmpval = sigsetjmp(buff.buff,0); 3015 if(jmpval == 0) 3016 { 3017 if((otype&FINT) && !sh_isstate(SH_MONITOR)) 3018 { 3019 signal(SIGQUIT,SIG_IGN); 3020 signal(SIGINT,SIG_IGN); 3021 } 3022 spawnpid = -1; 3023 if(t->com.comio) 3024 sh_redirect(shp,t->com.comio,0); 3025 error_info.id = *argv; 3026 if(t->com.comset) 3027 { 3028 scope++; 3029 sh_scope(shp,t->com.comset,0); 3030 } 3031 if(!strchr(path=argv[0],'/')) 3032 { 3033 Namval_t *np; 3034 if((np=nv_search(path,shp->track_tree,0)) && !nv_isattr(np,NV_NOALIAS) && np->nvalue.cp) 3035 path = nv_getval(np); 3036 else if(path_absolute(path,NIL(Pathcomp_t*))) 3037 { 3038 path = stkptr(shp->stk,PATH_OFFSET); 3039 stkfreeze(shp->stk,0); 3040 } 3041 else 3042 { 3043 pp=path_get(path); 3044 while(pp) 3045 { 3046 if(pp->len==1 && *pp->name=='.') 3047 break; 3048 pp = pp->next; 3049 } 3050 if(!pp) 3051 path = 0; 3052 } 3053 } 3054 else if(sh_isoption(SH_RESTRICTED)) 3055 errormsg(SH_DICT,ERROR_exit(1),e_restricted,path); 3056 if(!path) 3057 { 3058 spawnpid = -1; 3059 goto fail; 3060 } 3061 arge = sh_envgen(); 3062 shp->exitval = 0; 3063 #ifdef SIGTSTP 3064 if(job.jobcontrol) 3065 { 3066 signal(SIGTTIN,SIG_DFL); 3067 signal(SIGTTOU,SIG_DFL); 3068 jobwasset++; 3069 } 3070 #endif /* SIGTSTP */ 3071 #ifdef JOBS 3072 if(sh_isstate(SH_MONITOR) && (job.jobcontrol || (otype&FAMP))) 3073 { 3074 if((otype&FAMP) || job.curpgid==0) 3075 grp = 1; 3076 else 3077 grp = job.curpgid; 3078 } 3079 #endif /* JOBS */ 3080 3081 sfsync(NIL(Sfio_t*)); 3082 sigreset(0); /* set signals to ignore */ 3083 sigwasset++; 3084 /* find first path that has a library component */ 3085 for(pp=path_get(argv[0]); pp && !pp->lib ; pp=pp->next); 3086 spawnpid = path_spawn(path,argv,arge,pp,(grp<<1)|1); 3087 if(spawnpid < 0 && errno==ENOEXEC) 3088 { 3089 char *devfd; 3090 int fd = open(path,O_RDONLY); 3091 argv[-1] = argv[0]; 3092 argv[0] = path; 3093 if(fd>=0) 3094 { 3095 struct stat statb; 3096 sfprintf(sh.strbuf,"/dev/fd/%d",fd); 3097 if(stat(devfd=sfstruse(sh.strbuf),&statb)>=0) 3098 argv[0] = devfd; 3099 } 3100 if(!shp->shpath) 3101 shp->shpath = pathshell(); 3102 spawnpid = path_spawn(shp->shpath,&argv[-1],arge,pp,(grp<<1)|1); 3103 if(fd>=0) 3104 close(fd); 3105 argv[0] = argv[-1]; 3106 } 3107 fail: 3108 if(spawnpid < 0) switch(errno=shp->path_err) 3109 { 3110 case ENOENT: 3111 errormsg(SH_DICT,ERROR_system(ERROR_NOENT),e_found+4); 3112 default: 3113 errormsg(SH_DICT,ERROR_system(ERROR_NOEXEC),e_exec+4); 3114 } 3115 } 3116 else 3117 exitset(); 3118 sh_popcontext(&buff); 3119 if(buff.olist) 3120 free_list(buff.olist); 3121 #ifdef SIGTSTP 3122 if(jobwasset) 3123 { 3124 signal(SIGTTIN,SIG_IGN); 3125 signal(SIGTTOU,SIG_IGN); 3126 } 3127 #endif /* SIGTSTP */ 3128 if(sigwasset) 3129 sigreset(1); /* restore ignored signals */ 3130 if(scope) 3131 { 3132 sh_unscope(shp); 3133 if(jmpval==SH_JMPSCRIPT) 3134 nv_setlist(t->com.comset,NV_EXPORT|NV_IDENT|NV_ASSIGN); 3135 } 3136 if(t->com.comio) 3137 sh_iorestore(shp,buff.topfd,jmpval); 3138 if(jmpval>SH_JMPCMD) 3139 siglongjmp(*shp->jmplist,jmpval); 3140 if(spawnpid>0) 3141 { 3142 _sh_fork(spawnpid,otype,jobid); 3143 #ifdef JOBS 3144 if(grp==1) 3145 job.curpgid = spawnpid; 3146 # ifdef SIGTSTP 3147 if(grp>0 && !(otype&FAMP)) 3148 { 3149 while(tcsetpgrp(job.fd,job.curpgid)<0 && job.curpgid!=spawnpid) 3150 job.curpgid = spawnpid; 3151 } 3152 # endif /* SIGTSTP */ 3153 #endif /* JOBS */ 3154 savejobid = *jobid; 3155 if(otype) 3156 return(0); 3157 } 3158 return(spawnpid); 3159 } 3160 3161 # ifdef _was_lib_fork 3162 # define _lib_fork 1 3163 # endif 3164 # ifndef _lib_fork 3165 pid_t fork(void) 3166 { 3167 errormsg(SH_DICT,ERROR_exit(3),e_notimp,"fork"); 3168 return(-1); 3169 } 3170 # endif /* _lib_fork */ 3171 #endif /* SHOPT_SPAWN */ 3172