1 /*- 2 * Copyright (c) 1991, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * This code is derived from software contributed to Berkeley by 6 * Kenneth Almquist. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. All advertising materials mentioning features or use of this software 17 * must display the following acknowledgement: 18 * This product includes software developed by the University of 19 * California, Berkeley and its contributors. 20 * 4. Neither the name of the University nor the names of its contributors 21 * may be used to endorse or promote products derived from this software 22 * without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 * SUCH DAMAGE. 35 */ 36 37 #ifndef lint 38 #if 0 39 static char sccsid[] = "@(#)jobs.c 8.5 (Berkeley) 5/4/95"; 40 #endif 41 #endif /* not lint */ 42 #include <sys/cdefs.h> 43 __FBSDID("$FreeBSD$"); 44 45 #include <fcntl.h> 46 #include <signal.h> 47 #include <errno.h> 48 #include <paths.h> 49 #include <unistd.h> 50 #include <stdlib.h> 51 #include <sys/param.h> 52 #include <sys/wait.h> 53 #include <sys/time.h> 54 #include <sys/resource.h> 55 #include <paths.h> 56 #include <sys/ioctl.h> 57 58 #include "shell.h" 59 #if JOBS 60 #include <termios.h> 61 #undef CEOF /* syntax.h redefines this */ 62 #endif 63 #include "redir.h" 64 #include "show.h" 65 #include "main.h" 66 #include "parser.h" 67 #include "nodes.h" 68 #include "jobs.h" 69 #include "options.h" 70 #include "trap.h" 71 #include "syntax.h" 72 #include "input.h" 73 #include "output.h" 74 #include "memalloc.h" 75 #include "error.h" 76 #include "mystring.h" 77 78 79 struct job *jobtab; /* array of jobs */ 80 int njobs; /* size of array */ 81 MKINIT pid_t backgndpid = -1; /* pid of last background process */ 82 #if JOBS 83 struct job *jobmru; /* most recently used job list */ 84 pid_t initialpgrp; /* pgrp of shell on invocation */ 85 #endif 86 int in_waitcmd = 0; /* are we in waitcmd()? */ 87 int in_dowait = 0; /* are we in dowait()? */ 88 volatile sig_atomic_t breakwaitcmd = 0; /* should wait be terminated? */ 89 static int ttyfd = -1; 90 91 #if JOBS 92 STATIC void restartjob(struct job *); 93 #endif 94 STATIC void freejob(struct job *); 95 STATIC struct job *getjob(char *); 96 STATIC pid_t dowait(int, struct job *); 97 STATIC pid_t waitproc(int, int *); 98 STATIC void cmdtxt(union node *); 99 STATIC void cmdputs(char *); 100 #if JOBS 101 STATIC void setcurjob(struct job *); 102 STATIC void deljob(struct job *); 103 STATIC struct job *getcurjob(struct job *); 104 #endif 105 STATIC void showjob(struct job *, pid_t, int, int); 106 107 108 /* 109 * Turn job control on and off. 110 */ 111 112 MKINIT int jobctl; 113 114 #if JOBS 115 void 116 setjobctl(int on) 117 { 118 int i; 119 120 if (on == jobctl || rootshell == 0) 121 return; 122 if (on) { 123 if (ttyfd != -1) 124 close(ttyfd); 125 if ((ttyfd = open(_PATH_TTY, O_RDWR)) < 0) { 126 i = 0; 127 while (i <= 2 && !isatty(i)) 128 i++; 129 if (i > 2 || (ttyfd = dup(i)) < 0) 130 goto out; 131 } 132 if (fcntl(ttyfd, FD_CLOEXEC, 1) < 0) { 133 close(ttyfd); 134 ttyfd = -1; 135 goto out; 136 } 137 do { /* while we are in the background */ 138 initialpgrp = tcgetpgrp(ttyfd); 139 if (initialpgrp < 0) { 140 out: out2str("sh: can't access tty; job control turned off\n"); 141 mflag = 0; 142 return; 143 } 144 if (initialpgrp == -1) 145 initialpgrp = getpgrp(); 146 else if (initialpgrp != getpgrp()) { 147 killpg(0, SIGTTIN); 148 continue; 149 } 150 } while (0); 151 setsignal(SIGTSTP); 152 setsignal(SIGTTOU); 153 setsignal(SIGTTIN); 154 setpgid(0, rootpid); 155 tcsetpgrp(ttyfd, rootpid); 156 } else { /* turning job control off */ 157 setpgid(0, initialpgrp); 158 tcsetpgrp(ttyfd, initialpgrp); 159 close(ttyfd); 160 ttyfd = -1; 161 setsignal(SIGTSTP); 162 setsignal(SIGTTOU); 163 setsignal(SIGTTIN); 164 } 165 jobctl = on; 166 } 167 #endif 168 169 170 #ifdef mkinit 171 INCLUDE <sys/types.h> 172 INCLUDE <stdlib.h> 173 174 SHELLPROC { 175 backgndpid = -1; 176 #if JOBS 177 jobctl = 0; 178 #endif 179 } 180 181 #endif 182 183 184 185 #if JOBS 186 int 187 fgcmd(int argc __unused, char **argv) 188 { 189 struct job *jp; 190 pid_t pgrp; 191 int status; 192 193 jp = getjob(argv[1]); 194 if (jp->jobctl == 0) 195 error("job not created under job control"); 196 out1str(jp->ps[0].cmd); 197 out1c('\n'); 198 flushout(&output); 199 pgrp = jp->ps[0].pid; 200 tcsetpgrp(ttyfd, pgrp); 201 restartjob(jp); 202 jp->foreground = 1; 203 INTOFF; 204 status = waitforjob(jp, (int *)NULL); 205 INTON; 206 return status; 207 } 208 209 210 int 211 bgcmd(int argc, char **argv) 212 { 213 char s[64]; 214 struct job *jp; 215 216 do { 217 jp = getjob(*++argv); 218 if (jp->jobctl == 0) 219 error("job not created under job control"); 220 if (jp->state == JOBDONE) 221 continue; 222 restartjob(jp); 223 jp->foreground = 0; 224 fmtstr(s, 64, "[%d] ", jp - jobtab + 1); 225 out1str(s); 226 out1str(jp->ps[0].cmd); 227 out1c('\n'); 228 } while (--argc > 1); 229 return 0; 230 } 231 232 233 STATIC void 234 restartjob(struct job *jp) 235 { 236 struct procstat *ps; 237 int i; 238 239 if (jp->state == JOBDONE) 240 return; 241 setcurjob(jp); 242 INTOFF; 243 killpg(jp->ps[0].pid, SIGCONT); 244 for (ps = jp->ps, i = jp->nprocs ; --i >= 0 ; ps++) { 245 if (WIFSTOPPED(ps->status)) { 246 ps->status = -1; 247 jp->state = 0; 248 } 249 } 250 INTON; 251 } 252 #endif 253 254 255 int 256 jobscmd(int argc, char *argv[]) 257 { 258 char *id; 259 int ch, sformat, lformat; 260 261 optind = optreset = 1; 262 opterr = 0; 263 sformat = lformat = 0; 264 while ((ch = getopt(argc, argv, "ls")) != -1) { 265 switch (ch) { 266 case 'l': 267 lformat = 1; 268 break; 269 case 's': 270 sformat = 1; 271 break; 272 case '?': 273 default: 274 error("unknown option: -%c", optopt); 275 } 276 } 277 argc -= optind; 278 argv += optind; 279 280 if (argc == 0) 281 showjobs(0, sformat, lformat); 282 else 283 while ((id = *argv++) != NULL) 284 showjob(getjob(id), 0, sformat, lformat); 285 286 return (0); 287 } 288 289 STATIC void 290 showjob(struct job *jp, pid_t pid, int sformat, int lformat) 291 { 292 char s[64]; 293 struct procstat *ps; 294 struct job *j; 295 int col, curr, i, jobno, prev, procno; 296 char c; 297 298 procno = jp->nprocs; 299 jobno = jp - jobtab + 1; 300 curr = prev = 0; 301 #if JOBS 302 if ((j = getcurjob(NULL)) != NULL) { 303 curr = j - jobtab + 1; 304 if ((j = getcurjob(j)) != NULL) 305 prev = j - jobtab + 1; 306 } 307 #endif 308 for (ps = jp->ps ; ; ps++) { /* for each process */ 309 if (sformat) { 310 out1fmt("%d\n", (int)ps->pid); 311 goto skip; 312 } 313 if (!lformat && ps != jp->ps && pid == 0) 314 goto skip; 315 if (pid != 0 && pid != ps->pid) 316 goto skip; 317 if (jobno == curr && ps == jp->ps) 318 c = '+'; 319 else if (jobno == prev && ps == jp->ps) 320 c = '-'; 321 else 322 c = ' '; 323 if (ps == jp->ps) 324 fmtstr(s, 64, "[%d] %c ", jobno, c); 325 else 326 fmtstr(s, 64, " %c ", c); 327 out1str(s); 328 col = strlen(s); 329 if (lformat) { 330 fmtstr(s, 64, "%d ", (int)ps->pid); 331 out1str(s); 332 col += strlen(s); 333 } 334 s[0] = '\0'; 335 if (ps != jp->ps) { 336 *s = '\0'; 337 } else if (ps->status == -1) { 338 strcpy(s, "Running"); 339 } else if (WIFEXITED(ps->status)) { 340 if (WEXITSTATUS(ps->status) == 0) 341 strcpy(s, "Done"); 342 else 343 fmtstr(s, 64, "Done (%d)", 344 WEXITSTATUS(ps->status)); 345 } else { 346 #if JOBS 347 if (WIFSTOPPED(ps->status)) 348 i = WSTOPSIG(ps->status); 349 else 350 #endif 351 i = WTERMSIG(ps->status); 352 if ((i & 0x7F) < NSIG && sys_siglist[i & 0x7F]) 353 scopy(sys_siglist[i & 0x7F], s); 354 else 355 fmtstr(s, 64, "Signal %d", i & 0x7F); 356 if (WCOREDUMP(ps->status)) 357 strcat(s, " (core dumped)"); 358 } 359 out1str(s); 360 col += strlen(s); 361 do { 362 out1c(' '); 363 col++; 364 } while (col < 30); 365 out1str(ps->cmd); 366 out1c('\n'); 367 skip: if (--procno <= 0) 368 break; 369 } 370 } 371 372 /* 373 * Print a list of jobs. If "change" is nonzero, only print jobs whose 374 * statuses have changed since the last call to showjobs. 375 * 376 * If the shell is interrupted in the process of creating a job, the 377 * result may be a job structure containing zero processes. Such structures 378 * will be freed here. 379 */ 380 381 void 382 showjobs(int change, int sformat, int lformat) 383 { 384 int jobno; 385 struct job *jp; 386 387 TRACE(("showjobs(%d) called\n", change)); 388 while (dowait(0, (struct job *)NULL) > 0); 389 for (jobno = 1, jp = jobtab ; jobno <= njobs ; jobno++, jp++) { 390 if (! jp->used) 391 continue; 392 if (jp->nprocs == 0) { 393 freejob(jp); 394 continue; 395 } 396 if (change && ! jp->changed) 397 continue; 398 showjob(jp, 0, sformat, lformat); 399 jp->changed = 0; 400 if (jp->state == JOBDONE) { 401 freejob(jp); 402 } 403 } 404 } 405 406 407 /* 408 * Mark a job structure as unused. 409 */ 410 411 STATIC void 412 freejob(struct job *jp) 413 { 414 struct procstat *ps; 415 int i; 416 417 INTOFF; 418 for (i = jp->nprocs, ps = jp->ps ; --i >= 0 ; ps++) { 419 if (ps->cmd != nullstr) 420 ckfree(ps->cmd); 421 } 422 if (jp->ps != &jp->ps0) 423 ckfree(jp->ps); 424 jp->used = 0; 425 #if JOBS 426 deljob(jp); 427 #endif 428 INTON; 429 } 430 431 432 433 int 434 waitcmd(int argc, char **argv) 435 { 436 struct job *job; 437 int status, retval; 438 struct job *jp; 439 440 if (argc > 1) { 441 job = getjob(argv[1]); 442 } else { 443 job = NULL; 444 } 445 446 /* 447 * Loop until a process is terminated or stopped, or a SIGINT is 448 * received. 449 */ 450 451 in_waitcmd++; 452 do { 453 if (job != NULL) { 454 if (job->state) { 455 status = job->ps[job->nprocs - 1].status; 456 if (WIFEXITED(status)) 457 retval = WEXITSTATUS(status); 458 #if JOBS 459 else if (WIFSTOPPED(status)) 460 retval = WSTOPSIG(status) + 128; 461 #endif 462 else 463 retval = WTERMSIG(status) + 128; 464 if (! iflag) 465 freejob(job); 466 in_waitcmd--; 467 return retval; 468 } 469 } else { 470 for (jp = jobtab ; ; jp++) { 471 if (jp >= jobtab + njobs) { /* no running procs */ 472 in_waitcmd--; 473 return 0; 474 } 475 if (jp->used && jp->state == 0) 476 break; 477 } 478 } 479 } while (dowait(1, (struct job *)NULL) != -1); 480 in_waitcmd--; 481 482 return 0; 483 } 484 485 486 487 int 488 jobidcmd(int argc __unused, char **argv) 489 { 490 struct job *jp; 491 int i; 492 493 jp = getjob(argv[1]); 494 for (i = 0 ; i < jp->nprocs ; ) { 495 out1fmt("%d", (int)jp->ps[i].pid); 496 out1c(++i < jp->nprocs? ' ' : '\n'); 497 } 498 return 0; 499 } 500 501 502 503 /* 504 * Convert a job name to a job structure. 505 */ 506 507 STATIC struct job * 508 getjob(char *name) 509 { 510 int jobno; 511 struct job *found, *jp; 512 pid_t pid; 513 int i; 514 515 if (name == NULL) { 516 #if JOBS 517 currentjob: if ((jp = getcurjob(NULL)) == NULL) 518 error("No current job"); 519 return (jp); 520 #else 521 error("No current job"); 522 #endif 523 } else if (name[0] == '%') { 524 if (is_digit(name[1])) { 525 jobno = number(name + 1); 526 if (jobno > 0 && jobno <= njobs 527 && jobtab[jobno - 1].used != 0) 528 return &jobtab[jobno - 1]; 529 #if JOBS 530 } else if (name[1] == '%' && name[2] == '\0') { 531 goto currentjob; 532 } else if (name[1] == '+' && name[2] == '\0') { 533 goto currentjob; 534 } else if (name[1] == '-' && name[2] == '\0') { 535 if ((jp = getcurjob(NULL)) == NULL || 536 (jp = getcurjob(jp)) == NULL) 537 error("No previous job"); 538 return (jp); 539 #endif 540 } else if (name[1] == '?') { 541 found = NULL; 542 for (jp = jobtab, i = njobs ; --i >= 0 ; jp++) { 543 if (jp->used && jp->nprocs > 0 544 && strstr(jp->ps[0].cmd, name + 2) != NULL) { 545 if (found) 546 error("%s: ambiguous", name); 547 found = jp; 548 } 549 } 550 if (found != NULL) 551 return (found); 552 } else { 553 found = NULL; 554 for (jp = jobtab, i = njobs ; --i >= 0 ; jp++) { 555 if (jp->used && jp->nprocs > 0 556 && prefix(name + 1, jp->ps[0].cmd)) { 557 if (found) 558 error("%s: ambiguous", name); 559 found = jp; 560 } 561 } 562 if (found) 563 return found; 564 } 565 } else if (is_number(name)) { 566 pid = (pid_t)number(name); 567 for (jp = jobtab, i = njobs ; --i >= 0 ; jp++) { 568 if (jp->used && jp->nprocs > 0 569 && jp->ps[jp->nprocs - 1].pid == pid) 570 return jp; 571 } 572 } 573 error("No such job: %s", name); 574 /*NOTREACHED*/ 575 return NULL; 576 } 577 578 579 580 /* 581 * Return a new job structure, 582 */ 583 584 struct job * 585 makejob(union node *node __unused, int nprocs) 586 { 587 int i; 588 struct job *jp; 589 590 for (i = njobs, jp = jobtab ; ; jp++) { 591 if (--i < 0) { 592 INTOFF; 593 if (njobs == 0) { 594 jobtab = ckmalloc(4 * sizeof jobtab[0]); 595 #if JOBS 596 jobmru = NULL; 597 #endif 598 } else { 599 jp = ckmalloc((njobs + 4) * sizeof jobtab[0]); 600 memcpy(jp, jobtab, njobs * sizeof jp[0]); 601 #if JOBS 602 /* Relocate `next' pointers and list head */ 603 if (jobmru != NULL) 604 jobmru = &jp[jobmru - jobtab]; 605 for (i = 0; i < njobs; i++) 606 if (jp[i].next != NULL) 607 jp[i].next = &jp[jp[i].next - 608 jobtab]; 609 #endif 610 /* Relocate `ps' pointers */ 611 for (i = 0; i < njobs; i++) 612 if (jp[i].ps == &jobtab[i].ps0) 613 jp[i].ps = &jp[i].ps0; 614 ckfree(jobtab); 615 jobtab = jp; 616 } 617 jp = jobtab + njobs; 618 for (i = 4 ; --i >= 0 ; jobtab[njobs++].used = 0); 619 INTON; 620 break; 621 } 622 if (jp->used == 0) 623 break; 624 } 625 INTOFF; 626 jp->state = 0; 627 jp->used = 1; 628 jp->changed = 0; 629 jp->nprocs = 0; 630 jp->foreground = 0; 631 #if JOBS 632 jp->jobctl = jobctl; 633 jp->next = NULL; 634 #endif 635 if (nprocs > 1) { 636 jp->ps = ckmalloc(nprocs * sizeof (struct procstat)); 637 } else { 638 jp->ps = &jp->ps0; 639 } 640 INTON; 641 TRACE(("makejob(0x%lx, %d) returns %%%d\n", (long)node, nprocs, 642 jp - jobtab + 1)); 643 return jp; 644 } 645 646 #if JOBS 647 STATIC void 648 setcurjob(struct job *cj) 649 { 650 struct job *jp, *prev; 651 652 for (prev = NULL, jp = jobmru; jp != NULL; prev = jp, jp = jp->next) { 653 if (jp == cj) { 654 if (prev != NULL) 655 prev->next = jp->next; 656 else 657 jobmru = jp->next; 658 jp->next = jobmru; 659 jobmru = cj; 660 return; 661 } 662 } 663 cj->next = jobmru; 664 jobmru = cj; 665 } 666 667 STATIC void 668 deljob(struct job *j) 669 { 670 struct job *jp, *prev; 671 672 for (prev = NULL, jp = jobmru; jp != NULL; prev = jp, jp = jp->next) { 673 if (jp == j) { 674 if (prev != NULL) 675 prev->next = jp->next; 676 else 677 jobmru = jp->next; 678 return; 679 } 680 } 681 } 682 683 /* 684 * Return the most recently used job that isn't `nj', and preferably one 685 * that is stopped. 686 */ 687 STATIC struct job * 688 getcurjob(struct job *nj) 689 { 690 struct job *jp; 691 692 /* Try to find a stopped one.. */ 693 for (jp = jobmru; jp != NULL; jp = jp->next) 694 if (jp->used && jp != nj && jp->state == JOBSTOPPED) 695 return (jp); 696 /* Otherwise the most recently used job that isn't `nj' */ 697 for (jp = jobmru; jp != NULL; jp = jp->next) 698 if (jp->used && jp != nj) 699 return (jp); 700 701 return (NULL); 702 } 703 704 #endif 705 706 /* 707 * Fork of a subshell. If we are doing job control, give the subshell its 708 * own process group. Jp is a job structure that the job is to be added to. 709 * N is the command that will be evaluated by the child. Both jp and n may 710 * be NULL. The mode parameter can be one of the following: 711 * FORK_FG - Fork off a foreground process. 712 * FORK_BG - Fork off a background process. 713 * FORK_NOJOB - Like FORK_FG, but don't give the process its own 714 * process group even if job control is on. 715 * 716 * When job control is turned off, background processes have their standard 717 * input redirected to /dev/null (except for the second and later processes 718 * in a pipeline). 719 */ 720 721 pid_t 722 forkshell(struct job *jp, union node *n, int mode) 723 { 724 pid_t pid; 725 pid_t pgrp; 726 727 TRACE(("forkshell(%%%d, 0x%lx, %d) called\n", jp - jobtab, (long)n, 728 mode)); 729 INTOFF; 730 pid = fork(); 731 if (pid == -1) { 732 TRACE(("Fork failed, errno=%d\n", errno)); 733 INTON; 734 error("Cannot fork: %s", strerror(errno)); 735 } 736 if (pid == 0) { 737 struct job *p; 738 int wasroot; 739 int i; 740 741 TRACE(("Child shell %d\n", (int)getpid())); 742 wasroot = rootshell; 743 rootshell = 0; 744 for (i = njobs, p = jobtab ; --i >= 0 ; p++) 745 if (p->used) 746 freejob(p); 747 closescript(); 748 INTON; 749 clear_traps(); 750 #if JOBS 751 jobctl = 0; /* do job control only in root shell */ 752 if (wasroot && mode != FORK_NOJOB && mflag) { 753 if (jp == NULL || jp->nprocs == 0) 754 pgrp = getpid(); 755 else 756 pgrp = jp->ps[0].pid; 757 if (setpgid(0, pgrp) == 0 && mode == FORK_FG) { 758 /*** this causes superfluous TIOCSPGRPS ***/ 759 if (tcsetpgrp(ttyfd, pgrp) < 0) 760 error("tcsetpgrp failed, errno=%d", errno); 761 } 762 setsignal(SIGTSTP); 763 setsignal(SIGTTOU); 764 } else if (mode == FORK_BG) { 765 ignoresig(SIGINT); 766 ignoresig(SIGQUIT); 767 if ((jp == NULL || jp->nprocs == 0) && 768 ! fd0_redirected_p ()) { 769 close(0); 770 if (open(_PATH_DEVNULL, O_RDONLY) != 0) 771 error("Can't open %s: %s", 772 _PATH_DEVNULL, strerror(errno)); 773 } 774 } 775 #else 776 if (mode == FORK_BG) { 777 ignoresig(SIGINT); 778 ignoresig(SIGQUIT); 779 if ((jp == NULL || jp->nprocs == 0) && 780 ! fd0_redirected_p ()) { 781 close(0); 782 if (open(_PATH_DEVNULL, O_RDONLY) != 0) 783 error("Can't open %s: %s", 784 _PATH_DEVNULL, strerror(errno)); 785 } 786 } 787 #endif 788 if (wasroot && iflag) { 789 setsignal(SIGINT); 790 setsignal(SIGQUIT); 791 setsignal(SIGTERM); 792 } 793 return pid; 794 } 795 if (rootshell && mode != FORK_NOJOB && mflag) { 796 if (jp == NULL || jp->nprocs == 0) 797 pgrp = pid; 798 else 799 pgrp = jp->ps[0].pid; 800 setpgid(pid, pgrp); 801 } 802 if (mode == FORK_BG) 803 backgndpid = pid; /* set $! */ 804 if (jp) { 805 struct procstat *ps = &jp->ps[jp->nprocs++]; 806 ps->pid = pid; 807 ps->status = -1; 808 ps->cmd = nullstr; 809 if (iflag && rootshell && n) 810 ps->cmd = commandtext(n); 811 jp->foreground = mode == FORK_FG; 812 #if JOBS 813 setcurjob(jp); 814 #endif 815 } 816 INTON; 817 TRACE(("In parent shell: child = %d\n", (int)pid)); 818 return pid; 819 } 820 821 822 823 /* 824 * Wait for job to finish. 825 * 826 * Under job control we have the problem that while a child process is 827 * running interrupts generated by the user are sent to the child but not 828 * to the shell. This means that an infinite loop started by an inter- 829 * active user may be hard to kill. With job control turned off, an 830 * interactive user may place an interactive program inside a loop. If 831 * the interactive program catches interrupts, the user doesn't want 832 * these interrupts to also abort the loop. The approach we take here 833 * is to have the shell ignore interrupt signals while waiting for a 834 * foreground process to terminate, and then send itself an interrupt 835 * signal if the child process was terminated by an interrupt signal. 836 * Unfortunately, some programs want to do a bit of cleanup and then 837 * exit on interrupt; unless these processes terminate themselves by 838 * sending a signal to themselves (instead of calling exit) they will 839 * confuse this approach. 840 */ 841 842 int 843 waitforjob(struct job *jp, int *origstatus) 844 { 845 #if JOBS 846 pid_t mypgrp = getpgrp(); 847 #endif 848 int status; 849 int st; 850 851 INTOFF; 852 TRACE(("waitforjob(%%%d) called\n", jp - jobtab + 1)); 853 while (jp->state == 0) 854 if (dowait(1, jp) == -1) 855 dotrap(); 856 #if JOBS 857 if (jp->jobctl) { 858 if (tcsetpgrp(ttyfd, mypgrp) < 0) 859 error("tcsetpgrp failed, errno=%d\n", errno); 860 } 861 if (jp->state == JOBSTOPPED) 862 setcurjob(jp); 863 #endif 864 status = jp->ps[jp->nprocs - 1].status; 865 if (origstatus != NULL) 866 *origstatus = status; 867 /* convert to 8 bits */ 868 if (WIFEXITED(status)) 869 st = WEXITSTATUS(status); 870 #if JOBS 871 else if (WIFSTOPPED(status)) 872 st = WSTOPSIG(status) + 128; 873 #endif 874 else 875 st = WTERMSIG(status) + 128; 876 if (! JOBS || jp->state == JOBDONE) 877 freejob(jp); 878 if (int_pending()) { 879 if (WIFSIGNALED(status) && WTERMSIG(status) == SIGINT) 880 kill(getpid(), SIGINT); 881 else 882 CLEAR_PENDING_INT; 883 } 884 INTON; 885 return st; 886 } 887 888 889 890 /* 891 * Wait for a process to terminate. 892 */ 893 894 STATIC pid_t 895 dowait(int block, struct job *job) 896 { 897 pid_t pid; 898 int status; 899 struct procstat *sp; 900 struct job *jp; 901 struct job *thisjob; 902 int done; 903 int stopped; 904 int sig; 905 int i; 906 907 in_dowait++; 908 TRACE(("dowait(%d) called\n", block)); 909 do { 910 pid = waitproc(block, &status); 911 TRACE(("wait returns %d, status=%d\n", (int)pid, status)); 912 } while ((pid == -1 && errno == EINTR && breakwaitcmd == 0) || 913 (WIFSTOPPED(status) && !iflag)); 914 in_dowait--; 915 if (breakwaitcmd != 0) { 916 breakwaitcmd = 0; 917 return -1; 918 } 919 if (pid <= 0) 920 return pid; 921 INTOFF; 922 thisjob = NULL; 923 for (jp = jobtab ; jp < jobtab + njobs ; jp++) { 924 if (jp->used) { 925 done = 1; 926 stopped = 1; 927 for (sp = jp->ps ; sp < jp->ps + jp->nprocs ; sp++) { 928 if (sp->pid == -1) 929 continue; 930 if (sp->pid == pid) { 931 TRACE(("Changing status of proc %d from 0x%x to 0x%x\n", 932 (int)pid, sp->status, 933 status)); 934 sp->status = status; 935 thisjob = jp; 936 } 937 if (sp->status == -1) 938 stopped = 0; 939 else if (WIFSTOPPED(sp->status)) 940 done = 0; 941 } 942 if (stopped) { /* stopped or done */ 943 int state = done? JOBDONE : JOBSTOPPED; 944 if (jp->state != state) { 945 TRACE(("Job %d: changing state from %d to %d\n", jp - jobtab + 1, jp->state, state)); 946 jp->state = state; 947 #if JOBS 948 if (done) 949 deljob(jp); 950 #endif 951 } 952 } 953 } 954 } 955 INTON; 956 if (! rootshell || ! iflag || (job && thisjob == job)) { 957 #if JOBS 958 if (WIFSTOPPED(status)) 959 sig = WSTOPSIG(status); 960 else 961 #endif 962 { 963 if (WIFEXITED(status)) 964 sig = 0; 965 else 966 sig = WTERMSIG(status); 967 } 968 if (sig != 0 && sig != SIGINT && sig != SIGPIPE) { 969 if (jp->foreground) { 970 #if JOBS 971 if (WIFSTOPPED(status)) 972 i = WSTOPSIG(status); 973 else 974 #endif 975 i = WTERMSIG(status); 976 if ((i & 0x7F) < NSIG && sys_siglist[i & 0x7F]) 977 out1str(sys_siglist[i & 0x7F]); 978 else 979 out1fmt("Signal %d", i & 0x7F); 980 if (WCOREDUMP(status)) 981 out1str(" (core dumped)"); 982 out1c('\n'); 983 } else 984 showjob(thisjob, pid, 0, 1); 985 } 986 } else { 987 TRACE(("Not printing status, rootshell=%d, job=0x%x\n", rootshell, job)); 988 if (thisjob) 989 thisjob->changed = 1; 990 } 991 return pid; 992 } 993 994 995 996 /* 997 * Do a wait system call. If job control is compiled in, we accept 998 * stopped processes. If block is zero, we return a value of zero 999 * rather than blocking. 1000 */ 1001 STATIC pid_t 1002 waitproc(int block, int *status) 1003 { 1004 int flags; 1005 1006 #if JOBS 1007 flags = WUNTRACED; 1008 #else 1009 flags = 0; 1010 #endif 1011 if (block == 0) 1012 flags |= WNOHANG; 1013 return wait3(status, flags, (struct rusage *)NULL); 1014 } 1015 1016 /* 1017 * return 1 if there are stopped jobs, otherwise 0 1018 */ 1019 int job_warning = 0; 1020 int 1021 stoppedjobs(void) 1022 { 1023 int jobno; 1024 struct job *jp; 1025 1026 if (job_warning) 1027 return (0); 1028 for (jobno = 1, jp = jobtab; jobno <= njobs; jobno++, jp++) { 1029 if (jp->used == 0) 1030 continue; 1031 if (jp->state == JOBSTOPPED) { 1032 out2str("You have stopped jobs.\n"); 1033 job_warning = 2; 1034 return (1); 1035 } 1036 } 1037 1038 return (0); 1039 } 1040 1041 /* 1042 * Return a string identifying a command (to be printed by the 1043 * jobs command. 1044 */ 1045 1046 STATIC char *cmdnextc; 1047 STATIC int cmdnleft; 1048 #define MAXCMDTEXT 200 1049 1050 char * 1051 commandtext(union node *n) 1052 { 1053 char *name; 1054 1055 cmdnextc = name = ckmalloc(MAXCMDTEXT); 1056 cmdnleft = MAXCMDTEXT - 4; 1057 cmdtxt(n); 1058 *cmdnextc = '\0'; 1059 return name; 1060 } 1061 1062 1063 STATIC void 1064 cmdtxt(union node *n) 1065 { 1066 union node *np; 1067 struct nodelist *lp; 1068 char *p; 1069 int i; 1070 char s[2]; 1071 1072 if (n == NULL) 1073 return; 1074 switch (n->type) { 1075 case NSEMI: 1076 cmdtxt(n->nbinary.ch1); 1077 cmdputs("; "); 1078 cmdtxt(n->nbinary.ch2); 1079 break; 1080 case NAND: 1081 cmdtxt(n->nbinary.ch1); 1082 cmdputs(" && "); 1083 cmdtxt(n->nbinary.ch2); 1084 break; 1085 case NOR: 1086 cmdtxt(n->nbinary.ch1); 1087 cmdputs(" || "); 1088 cmdtxt(n->nbinary.ch2); 1089 break; 1090 case NPIPE: 1091 for (lp = n->npipe.cmdlist ; lp ; lp = lp->next) { 1092 cmdtxt(lp->n); 1093 if (lp->next) 1094 cmdputs(" | "); 1095 } 1096 break; 1097 case NSUBSHELL: 1098 cmdputs("("); 1099 cmdtxt(n->nredir.n); 1100 cmdputs(")"); 1101 break; 1102 case NREDIR: 1103 case NBACKGND: 1104 cmdtxt(n->nredir.n); 1105 break; 1106 case NIF: 1107 cmdputs("if "); 1108 cmdtxt(n->nif.test); 1109 cmdputs("; then "); 1110 cmdtxt(n->nif.ifpart); 1111 cmdputs("..."); 1112 break; 1113 case NWHILE: 1114 cmdputs("while "); 1115 goto until; 1116 case NUNTIL: 1117 cmdputs("until "); 1118 until: 1119 cmdtxt(n->nbinary.ch1); 1120 cmdputs("; do "); 1121 cmdtxt(n->nbinary.ch2); 1122 cmdputs("; done"); 1123 break; 1124 case NFOR: 1125 cmdputs("for "); 1126 cmdputs(n->nfor.var); 1127 cmdputs(" in ..."); 1128 break; 1129 case NCASE: 1130 cmdputs("case "); 1131 cmdputs(n->ncase.expr->narg.text); 1132 cmdputs(" in ..."); 1133 break; 1134 case NDEFUN: 1135 cmdputs(n->narg.text); 1136 cmdputs("() ..."); 1137 break; 1138 case NCMD: 1139 for (np = n->ncmd.args ; np ; np = np->narg.next) { 1140 cmdtxt(np); 1141 if (np->narg.next) 1142 cmdputs(" "); 1143 } 1144 for (np = n->ncmd.redirect ; np ; np = np->nfile.next) { 1145 cmdputs(" "); 1146 cmdtxt(np); 1147 } 1148 break; 1149 case NARG: 1150 cmdputs(n->narg.text); 1151 break; 1152 case NTO: 1153 p = ">"; i = 1; goto redir; 1154 case NAPPEND: 1155 p = ">>"; i = 1; goto redir; 1156 case NTOFD: 1157 p = ">&"; i = 1; goto redir; 1158 case NCLOBBER: 1159 p = ">|"; i = 1; goto redir; 1160 case NFROM: 1161 p = "<"; i = 0; goto redir; 1162 case NFROMTO: 1163 p = "<>"; i = 0; goto redir; 1164 case NFROMFD: 1165 p = "<&"; i = 0; goto redir; 1166 redir: 1167 if (n->nfile.fd != i) { 1168 s[0] = n->nfile.fd + '0'; 1169 s[1] = '\0'; 1170 cmdputs(s); 1171 } 1172 cmdputs(p); 1173 if (n->type == NTOFD || n->type == NFROMFD) { 1174 if (n->ndup.dupfd >= 0) 1175 s[0] = n->ndup.dupfd + '0'; 1176 else 1177 s[0] = '-'; 1178 s[1] = '\0'; 1179 cmdputs(s); 1180 } else { 1181 cmdtxt(n->nfile.fname); 1182 } 1183 break; 1184 case NHERE: 1185 case NXHERE: 1186 cmdputs("<<..."); 1187 break; 1188 default: 1189 cmdputs("???"); 1190 break; 1191 } 1192 } 1193 1194 1195 1196 STATIC void 1197 cmdputs(char *s) 1198 { 1199 char *p, *q; 1200 char c; 1201 int subtype = 0; 1202 1203 if (cmdnleft <= 0) 1204 return; 1205 p = s; 1206 q = cmdnextc; 1207 while ((c = *p++) != '\0') { 1208 if (c == CTLESC) 1209 *q++ = *p++; 1210 else if (c == CTLVAR) { 1211 *q++ = '$'; 1212 if (--cmdnleft > 0) 1213 *q++ = '{'; 1214 subtype = *p++; 1215 } else if (c == '=' && subtype != 0) { 1216 *q++ = "}-+?="[(subtype & VSTYPE) - VSNORMAL]; 1217 subtype = 0; 1218 } else if (c == CTLENDVAR) { 1219 *q++ = '}'; 1220 } else if (c == CTLBACKQ || c == CTLBACKQ+CTLQUOTE) 1221 cmdnleft++; /* ignore it */ 1222 else 1223 *q++ = c; 1224 if (--cmdnleft <= 0) { 1225 *q++ = '.'; 1226 *q++ = '.'; 1227 *q++ = '.'; 1228 break; 1229 } 1230 } 1231 cmdnextc = q; 1232 } 1233