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 = fcntl(i, F_DUPFD, 10)) < 0) 130 goto out; 131 } 132 if (ttyfd < 10) { 133 /* 134 * Keep our TTY file descriptor out of the way of 135 * the user's redirections. 136 */ 137 if ((i = fcntl(ttyfd, F_DUPFD, 10)) < 0) { 138 close(ttyfd); 139 ttyfd = -1; 140 goto out; 141 } 142 close(ttyfd); 143 ttyfd = i; 144 } 145 if (fcntl(ttyfd, F_SETFD, FD_CLOEXEC) < 0) { 146 close(ttyfd); 147 ttyfd = -1; 148 goto out; 149 } 150 do { /* while we are in the background */ 151 initialpgrp = tcgetpgrp(ttyfd); 152 if (initialpgrp < 0) { 153 out: out2str("sh: can't access tty; job control turned off\n"); 154 mflag = 0; 155 return; 156 } 157 if (initialpgrp == -1) 158 initialpgrp = getpgrp(); 159 else if (initialpgrp != getpgrp()) { 160 killpg(0, SIGTTIN); 161 continue; 162 } 163 } while (0); 164 setsignal(SIGTSTP); 165 setsignal(SIGTTOU); 166 setsignal(SIGTTIN); 167 setpgid(0, rootpid); 168 tcsetpgrp(ttyfd, rootpid); 169 } else { /* turning job control off */ 170 setpgid(0, initialpgrp); 171 tcsetpgrp(ttyfd, initialpgrp); 172 close(ttyfd); 173 ttyfd = -1; 174 setsignal(SIGTSTP); 175 setsignal(SIGTTOU); 176 setsignal(SIGTTIN); 177 } 178 jobctl = on; 179 } 180 #endif 181 182 183 #ifdef mkinit 184 INCLUDE <sys/types.h> 185 INCLUDE <stdlib.h> 186 187 SHELLPROC { 188 backgndpid = -1; 189 #if JOBS 190 jobctl = 0; 191 #endif 192 } 193 194 #endif 195 196 197 198 #if JOBS 199 int 200 fgcmd(int argc __unused, char **argv) 201 { 202 struct job *jp; 203 pid_t pgrp; 204 int status; 205 206 jp = getjob(argv[1]); 207 if (jp->jobctl == 0) 208 error("job not created under job control"); 209 out1str(jp->ps[0].cmd); 210 out1c('\n'); 211 flushout(&output); 212 pgrp = jp->ps[0].pid; 213 tcsetpgrp(ttyfd, pgrp); 214 restartjob(jp); 215 jp->foreground = 1; 216 INTOFF; 217 status = waitforjob(jp, (int *)NULL); 218 INTON; 219 return status; 220 } 221 222 223 int 224 bgcmd(int argc, char **argv) 225 { 226 char s[64]; 227 struct job *jp; 228 229 do { 230 jp = getjob(*++argv); 231 if (jp->jobctl == 0) 232 error("job not created under job control"); 233 if (jp->state == JOBDONE) 234 continue; 235 restartjob(jp); 236 jp->foreground = 0; 237 fmtstr(s, 64, "[%td] ", jp - jobtab + 1); 238 out1str(s); 239 out1str(jp->ps[0].cmd); 240 out1c('\n'); 241 } while (--argc > 1); 242 return 0; 243 } 244 245 246 STATIC void 247 restartjob(struct job *jp) 248 { 249 struct procstat *ps; 250 int i; 251 252 if (jp->state == JOBDONE) 253 return; 254 setcurjob(jp); 255 INTOFF; 256 killpg(jp->ps[0].pid, SIGCONT); 257 for (ps = jp->ps, i = jp->nprocs ; --i >= 0 ; ps++) { 258 if (WIFSTOPPED(ps->status)) { 259 ps->status = -1; 260 jp->state = 0; 261 } 262 } 263 INTON; 264 } 265 #endif 266 267 268 int 269 jobscmd(int argc, char *argv[]) 270 { 271 char *id; 272 int ch, sformat, lformat; 273 274 optind = optreset = 1; 275 opterr = 0; 276 sformat = lformat = 0; 277 while ((ch = getopt(argc, argv, "ls")) != -1) { 278 switch (ch) { 279 case 'l': 280 lformat = 1; 281 break; 282 case 's': 283 sformat = 1; 284 break; 285 case '?': 286 default: 287 error("unknown option: -%c", optopt); 288 } 289 } 290 argc -= optind; 291 argv += optind; 292 293 if (argc == 0) 294 showjobs(0, sformat, lformat); 295 else 296 while ((id = *argv++) != NULL) 297 showjob(getjob(id), 0, sformat, lformat); 298 299 return (0); 300 } 301 302 STATIC void 303 showjob(struct job *jp, pid_t pid, int sformat, int lformat) 304 { 305 char s[64]; 306 struct procstat *ps; 307 struct job *j; 308 int col, curr, i, jobno, prev, procno; 309 char c; 310 311 procno = jp->nprocs; 312 jobno = jp - jobtab + 1; 313 curr = prev = 0; 314 #if JOBS 315 if ((j = getcurjob(NULL)) != NULL) { 316 curr = j - jobtab + 1; 317 if ((j = getcurjob(j)) != NULL) 318 prev = j - jobtab + 1; 319 } 320 #endif 321 for (ps = jp->ps ; ; ps++) { /* for each process */ 322 if (sformat) { 323 out1fmt("%d\n", (int)ps->pid); 324 goto skip; 325 } 326 if (!lformat && ps != jp->ps && pid == 0) 327 goto skip; 328 if (pid != 0 && pid != ps->pid) 329 goto skip; 330 if (jobno == curr && ps == jp->ps) 331 c = '+'; 332 else if (jobno == prev && ps == jp->ps) 333 c = '-'; 334 else 335 c = ' '; 336 if (ps == jp->ps) 337 fmtstr(s, 64, "[%d] %c ", jobno, c); 338 else 339 fmtstr(s, 64, " %c ", c); 340 out1str(s); 341 col = strlen(s); 342 if (lformat) { 343 fmtstr(s, 64, "%d ", (int)ps->pid); 344 out1str(s); 345 col += strlen(s); 346 } 347 s[0] = '\0'; 348 if (ps != jp->ps) { 349 *s = '\0'; 350 } else if (ps->status == -1) { 351 strcpy(s, "Running"); 352 } else if (WIFEXITED(ps->status)) { 353 if (WEXITSTATUS(ps->status) == 0) 354 strcpy(s, "Done"); 355 else 356 fmtstr(s, 64, "Done (%d)", 357 WEXITSTATUS(ps->status)); 358 } else { 359 #if JOBS 360 if (WIFSTOPPED(ps->status)) 361 i = WSTOPSIG(ps->status); 362 else 363 #endif 364 i = WTERMSIG(ps->status); 365 if ((i & 0x7F) < NSIG && sys_siglist[i & 0x7F]) 366 scopy(sys_siglist[i & 0x7F], s); 367 else 368 fmtstr(s, 64, "Signal %d", i & 0x7F); 369 if (WCOREDUMP(ps->status)) 370 strcat(s, " (core dumped)"); 371 } 372 out1str(s); 373 col += strlen(s); 374 do { 375 out1c(' '); 376 col++; 377 } while (col < 30); 378 out1str(ps->cmd); 379 out1c('\n'); 380 skip: if (--procno <= 0) 381 break; 382 } 383 } 384 385 /* 386 * Print a list of jobs. If "change" is nonzero, only print jobs whose 387 * statuses have changed since the last call to showjobs. 388 * 389 * If the shell is interrupted in the process of creating a job, the 390 * result may be a job structure containing zero processes. Such structures 391 * will be freed here. 392 */ 393 394 void 395 showjobs(int change, int sformat, int lformat) 396 { 397 int jobno; 398 struct job *jp; 399 400 TRACE(("showjobs(%d) called\n", change)); 401 while (dowait(0, (struct job *)NULL) > 0); 402 for (jobno = 1, jp = jobtab ; jobno <= njobs ; jobno++, jp++) { 403 if (! jp->used) 404 continue; 405 if (jp->nprocs == 0) { 406 freejob(jp); 407 continue; 408 } 409 if (change && ! jp->changed) 410 continue; 411 showjob(jp, 0, sformat, lformat); 412 jp->changed = 0; 413 if (jp->state == JOBDONE) { 414 freejob(jp); 415 } 416 } 417 } 418 419 420 /* 421 * Mark a job structure as unused. 422 */ 423 424 STATIC void 425 freejob(struct job *jp) 426 { 427 struct procstat *ps; 428 int i; 429 430 INTOFF; 431 for (i = jp->nprocs, ps = jp->ps ; --i >= 0 ; ps++) { 432 if (ps->cmd != nullstr) 433 ckfree(ps->cmd); 434 } 435 if (jp->ps != &jp->ps0) 436 ckfree(jp->ps); 437 jp->used = 0; 438 #if JOBS 439 deljob(jp); 440 #endif 441 INTON; 442 } 443 444 445 446 int 447 waitcmd(int argc, char **argv) 448 { 449 struct job *job; 450 int status, retval; 451 struct job *jp; 452 453 if (argc > 1) { 454 job = getjob(argv[1]); 455 } else { 456 job = NULL; 457 } 458 459 /* 460 * Loop until a process is terminated or stopped, or a SIGINT is 461 * received. 462 */ 463 464 in_waitcmd++; 465 do { 466 if (job != NULL) { 467 if (job->state) { 468 status = job->ps[job->nprocs - 1].status; 469 if (WIFEXITED(status)) 470 retval = WEXITSTATUS(status); 471 #if JOBS 472 else if (WIFSTOPPED(status)) 473 retval = WSTOPSIG(status) + 128; 474 #endif 475 else 476 retval = WTERMSIG(status) + 128; 477 if (! iflag) 478 freejob(job); 479 in_waitcmd--; 480 return retval; 481 } 482 } else { 483 for (jp = jobtab ; ; jp++) { 484 if (jp >= jobtab + njobs) { /* no running procs */ 485 in_waitcmd--; 486 return 0; 487 } 488 if (jp->used && jp->state == 0) 489 break; 490 } 491 } 492 } while (dowait(1, (struct job *)NULL) != -1); 493 in_waitcmd--; 494 495 return 0; 496 } 497 498 499 500 int 501 jobidcmd(int argc __unused, char **argv) 502 { 503 struct job *jp; 504 int i; 505 506 jp = getjob(argv[1]); 507 for (i = 0 ; i < jp->nprocs ; ) { 508 out1fmt("%d", (int)jp->ps[i].pid); 509 out1c(++i < jp->nprocs? ' ' : '\n'); 510 } 511 return 0; 512 } 513 514 515 516 /* 517 * Convert a job name to a job structure. 518 */ 519 520 STATIC struct job * 521 getjob(char *name) 522 { 523 int jobno; 524 struct job *found, *jp; 525 pid_t pid; 526 int i; 527 528 if (name == NULL) { 529 #if JOBS 530 currentjob: if ((jp = getcurjob(NULL)) == NULL) 531 error("No current job"); 532 return (jp); 533 #else 534 error("No current job"); 535 #endif 536 } else if (name[0] == '%') { 537 if (is_digit(name[1])) { 538 jobno = number(name + 1); 539 if (jobno > 0 && jobno <= njobs 540 && jobtab[jobno - 1].used != 0) 541 return &jobtab[jobno - 1]; 542 #if JOBS 543 } else if (name[1] == '%' && name[2] == '\0') { 544 goto currentjob; 545 } else if (name[1] == '+' && name[2] == '\0') { 546 goto currentjob; 547 } else if (name[1] == '-' && name[2] == '\0') { 548 if ((jp = getcurjob(NULL)) == NULL || 549 (jp = getcurjob(jp)) == NULL) 550 error("No previous job"); 551 return (jp); 552 #endif 553 } else if (name[1] == '?') { 554 found = NULL; 555 for (jp = jobtab, i = njobs ; --i >= 0 ; jp++) { 556 if (jp->used && jp->nprocs > 0 557 && strstr(jp->ps[0].cmd, name + 2) != NULL) { 558 if (found) 559 error("%s: ambiguous", name); 560 found = jp; 561 } 562 } 563 if (found != NULL) 564 return (found); 565 } else { 566 found = NULL; 567 for (jp = jobtab, i = njobs ; --i >= 0 ; jp++) { 568 if (jp->used && jp->nprocs > 0 569 && prefix(name + 1, jp->ps[0].cmd)) { 570 if (found) 571 error("%s: ambiguous", name); 572 found = jp; 573 } 574 } 575 if (found) 576 return found; 577 } 578 } else if (is_number(name)) { 579 pid = (pid_t)number(name); 580 for (jp = jobtab, i = njobs ; --i >= 0 ; jp++) { 581 if (jp->used && jp->nprocs > 0 582 && jp->ps[jp->nprocs - 1].pid == pid) 583 return jp; 584 } 585 } 586 error("No such job: %s", name); 587 /*NOTREACHED*/ 588 return NULL; 589 } 590 591 592 593 /* 594 * Return a new job structure, 595 */ 596 597 struct job * 598 makejob(union node *node __unused, int nprocs) 599 { 600 int i; 601 struct job *jp; 602 603 for (i = njobs, jp = jobtab ; ; jp++) { 604 if (--i < 0) { 605 INTOFF; 606 if (njobs == 0) { 607 jobtab = ckmalloc(4 * sizeof jobtab[0]); 608 #if JOBS 609 jobmru = NULL; 610 #endif 611 } else { 612 jp = ckmalloc((njobs + 4) * sizeof jobtab[0]); 613 memcpy(jp, jobtab, njobs * sizeof jp[0]); 614 #if JOBS 615 /* Relocate `next' pointers and list head */ 616 if (jobmru != NULL) 617 jobmru = &jp[jobmru - jobtab]; 618 for (i = 0; i < njobs; i++) 619 if (jp[i].next != NULL) 620 jp[i].next = &jp[jp[i].next - 621 jobtab]; 622 #endif 623 /* Relocate `ps' pointers */ 624 for (i = 0; i < njobs; i++) 625 if (jp[i].ps == &jobtab[i].ps0) 626 jp[i].ps = &jp[i].ps0; 627 ckfree(jobtab); 628 jobtab = jp; 629 } 630 jp = jobtab + njobs; 631 for (i = 4 ; --i >= 0 ; jobtab[njobs++].used = 0); 632 INTON; 633 break; 634 } 635 if (jp->used == 0) 636 break; 637 } 638 INTOFF; 639 jp->state = 0; 640 jp->used = 1; 641 jp->changed = 0; 642 jp->nprocs = 0; 643 jp->foreground = 0; 644 #if JOBS 645 jp->jobctl = jobctl; 646 jp->next = NULL; 647 #endif 648 if (nprocs > 1) { 649 jp->ps = ckmalloc(nprocs * sizeof (struct procstat)); 650 } else { 651 jp->ps = &jp->ps0; 652 } 653 INTON; 654 TRACE(("makejob(0x%lx, %d) returns %%%d\n", (long)node, nprocs, 655 jp - jobtab + 1)); 656 return jp; 657 } 658 659 #if JOBS 660 STATIC void 661 setcurjob(struct job *cj) 662 { 663 struct job *jp, *prev; 664 665 for (prev = NULL, jp = jobmru; jp != NULL; prev = jp, jp = jp->next) { 666 if (jp == cj) { 667 if (prev != NULL) 668 prev->next = jp->next; 669 else 670 jobmru = jp->next; 671 jp->next = jobmru; 672 jobmru = cj; 673 return; 674 } 675 } 676 cj->next = jobmru; 677 jobmru = cj; 678 } 679 680 STATIC void 681 deljob(struct job *j) 682 { 683 struct job *jp, *prev; 684 685 for (prev = NULL, jp = jobmru; jp != NULL; prev = jp, jp = jp->next) { 686 if (jp == j) { 687 if (prev != NULL) 688 prev->next = jp->next; 689 else 690 jobmru = jp->next; 691 return; 692 } 693 } 694 } 695 696 /* 697 * Return the most recently used job that isn't `nj', and preferably one 698 * that is stopped. 699 */ 700 STATIC struct job * 701 getcurjob(struct job *nj) 702 { 703 struct job *jp; 704 705 /* Try to find a stopped one.. */ 706 for (jp = jobmru; jp != NULL; jp = jp->next) 707 if (jp->used && jp != nj && jp->state == JOBSTOPPED) 708 return (jp); 709 /* Otherwise the most recently used job that isn't `nj' */ 710 for (jp = jobmru; jp != NULL; jp = jp->next) 711 if (jp->used && jp != nj) 712 return (jp); 713 714 return (NULL); 715 } 716 717 #endif 718 719 /* 720 * Fork of a subshell. If we are doing job control, give the subshell its 721 * own process group. Jp is a job structure that the job is to be added to. 722 * N is the command that will be evaluated by the child. Both jp and n may 723 * be NULL. The mode parameter can be one of the following: 724 * FORK_FG - Fork off a foreground process. 725 * FORK_BG - Fork off a background process. 726 * FORK_NOJOB - Like FORK_FG, but don't give the process its own 727 * process group even if job control is on. 728 * 729 * When job control is turned off, background processes have their standard 730 * input redirected to /dev/null (except for the second and later processes 731 * in a pipeline). 732 */ 733 734 pid_t 735 forkshell(struct job *jp, union node *n, int mode) 736 { 737 pid_t pid; 738 pid_t pgrp; 739 740 TRACE(("forkshell(%%%d, 0x%lx, %d) called\n", jp - jobtab, (long)n, 741 mode)); 742 INTOFF; 743 flushall(); 744 pid = fork(); 745 if (pid == -1) { 746 TRACE(("Fork failed, errno=%d\n", errno)); 747 INTON; 748 error("Cannot fork: %s", strerror(errno)); 749 } 750 if (pid == 0) { 751 struct job *p; 752 int wasroot; 753 int i; 754 755 TRACE(("Child shell %d\n", (int)getpid())); 756 wasroot = rootshell; 757 rootshell = 0; 758 closescript(); 759 INTON; 760 clear_traps(); 761 #if JOBS 762 jobctl = 0; /* do job control only in root shell */ 763 if (wasroot && mode != FORK_NOJOB && mflag) { 764 if (jp == NULL || jp->nprocs == 0) 765 pgrp = getpid(); 766 else 767 pgrp = jp->ps[0].pid; 768 if (setpgid(0, pgrp) == 0 && mode == FORK_FG) { 769 /*** this causes superfluous TIOCSPGRPS ***/ 770 if (tcsetpgrp(ttyfd, pgrp) < 0) 771 error("tcsetpgrp failed, errno=%d", errno); 772 } 773 setsignal(SIGTSTP); 774 setsignal(SIGTTOU); 775 } else if (mode == FORK_BG) { 776 ignoresig(SIGINT); 777 ignoresig(SIGQUIT); 778 if ((jp == NULL || jp->nprocs == 0) && 779 ! fd0_redirected_p ()) { 780 close(0); 781 if (open(_PATH_DEVNULL, O_RDONLY) != 0) 782 error("Can't open %s: %s", 783 _PATH_DEVNULL, strerror(errno)); 784 } 785 } 786 #else 787 if (mode == FORK_BG) { 788 ignoresig(SIGINT); 789 ignoresig(SIGQUIT); 790 if ((jp == NULL || jp->nprocs == 0) && 791 ! fd0_redirected_p ()) { 792 close(0); 793 if (open(_PATH_DEVNULL, O_RDONLY) != 0) 794 error("Can't open %s: %s", 795 _PATH_DEVNULL, strerror(errno)); 796 } 797 } 798 #endif 799 INTOFF; 800 for (i = njobs, p = jobtab ; --i >= 0 ; p++) 801 if (p->used) 802 freejob(p); 803 INTON; 804 if (wasroot && iflag) { 805 setsignal(SIGINT); 806 setsignal(SIGQUIT); 807 setsignal(SIGTERM); 808 } 809 return pid; 810 } 811 if (rootshell && mode != FORK_NOJOB && mflag) { 812 if (jp == NULL || jp->nprocs == 0) 813 pgrp = pid; 814 else 815 pgrp = jp->ps[0].pid; 816 setpgid(pid, pgrp); 817 } 818 if (mode == FORK_BG) 819 backgndpid = pid; /* set $! */ 820 if (jp) { 821 struct procstat *ps = &jp->ps[jp->nprocs++]; 822 ps->pid = pid; 823 ps->status = -1; 824 ps->cmd = nullstr; 825 if (iflag && rootshell && n) 826 ps->cmd = commandtext(n); 827 jp->foreground = mode == FORK_FG; 828 #if JOBS 829 setcurjob(jp); 830 #endif 831 } 832 INTON; 833 TRACE(("In parent shell: child = %d\n", (int)pid)); 834 return pid; 835 } 836 837 838 839 /* 840 * Wait for job to finish. 841 * 842 * Under job control we have the problem that while a child process is 843 * running interrupts generated by the user are sent to the child but not 844 * to the shell. This means that an infinite loop started by an inter- 845 * active user may be hard to kill. With job control turned off, an 846 * interactive user may place an interactive program inside a loop. If 847 * the interactive program catches interrupts, the user doesn't want 848 * these interrupts to also abort the loop. The approach we take here 849 * is to have the shell ignore interrupt signals while waiting for a 850 * foreground process to terminate, and then send itself an interrupt 851 * signal if the child process was terminated by an interrupt signal. 852 * Unfortunately, some programs want to do a bit of cleanup and then 853 * exit on interrupt; unless these processes terminate themselves by 854 * sending a signal to themselves (instead of calling exit) they will 855 * confuse this approach. 856 */ 857 858 int 859 waitforjob(struct job *jp, int *origstatus) 860 { 861 #if JOBS 862 pid_t mypgrp = getpgrp(); 863 #endif 864 int status; 865 int st; 866 867 INTOFF; 868 TRACE(("waitforjob(%%%d) called\n", jp - jobtab + 1)); 869 while (jp->state == 0) 870 if (dowait(1, jp) == -1) 871 dotrap(); 872 #if JOBS 873 if (jp->jobctl) { 874 if (tcsetpgrp(ttyfd, mypgrp) < 0) 875 error("tcsetpgrp failed, errno=%d\n", errno); 876 } 877 if (jp->state == JOBSTOPPED) 878 setcurjob(jp); 879 #endif 880 status = jp->ps[jp->nprocs - 1].status; 881 if (origstatus != NULL) 882 *origstatus = status; 883 /* convert to 8 bits */ 884 if (WIFEXITED(status)) 885 st = WEXITSTATUS(status); 886 #if JOBS 887 else if (WIFSTOPPED(status)) 888 st = WSTOPSIG(status) + 128; 889 #endif 890 else 891 st = WTERMSIG(status) + 128; 892 if (! JOBS || jp->state == JOBDONE) 893 freejob(jp); 894 if (int_pending()) { 895 if (WIFSIGNALED(status) && WTERMSIG(status) == SIGINT) 896 kill(getpid(), SIGINT); 897 else 898 CLEAR_PENDING_INT; 899 } 900 INTON; 901 return st; 902 } 903 904 905 906 /* 907 * Wait for a process to terminate. 908 */ 909 910 STATIC pid_t 911 dowait(int block, struct job *job) 912 { 913 pid_t pid; 914 int status; 915 struct procstat *sp; 916 struct job *jp; 917 struct job *thisjob; 918 int done; 919 int stopped; 920 int sig; 921 int i; 922 923 in_dowait++; 924 TRACE(("dowait(%d) called\n", block)); 925 do { 926 pid = waitproc(block, &status); 927 TRACE(("wait returns %d, status=%d\n", (int)pid, status)); 928 } while ((pid == -1 && errno == EINTR && breakwaitcmd == 0) || 929 (WIFSTOPPED(status) && !iflag)); 930 in_dowait--; 931 if (breakwaitcmd != 0) { 932 breakwaitcmd = 0; 933 return -1; 934 } 935 if (pid <= 0) 936 return pid; 937 INTOFF; 938 thisjob = NULL; 939 for (jp = jobtab ; jp < jobtab + njobs ; jp++) { 940 if (jp->used) { 941 done = 1; 942 stopped = 1; 943 for (sp = jp->ps ; sp < jp->ps + jp->nprocs ; sp++) { 944 if (sp->pid == -1) 945 continue; 946 if (sp->pid == pid) { 947 TRACE(("Changing status of proc %d from 0x%x to 0x%x\n", 948 (int)pid, sp->status, 949 status)); 950 sp->status = status; 951 thisjob = jp; 952 } 953 if (sp->status == -1) 954 stopped = 0; 955 else if (WIFSTOPPED(sp->status)) 956 done = 0; 957 } 958 if (stopped) { /* stopped or done */ 959 int state = done? JOBDONE : JOBSTOPPED; 960 if (jp->state != state) { 961 TRACE(("Job %d: changing state from %d to %d\n", jp - jobtab + 1, jp->state, state)); 962 jp->state = state; 963 #if JOBS 964 if (done) 965 deljob(jp); 966 #endif 967 } 968 } 969 } 970 } 971 INTON; 972 if (! rootshell || ! iflag || (job && thisjob == job)) { 973 #if JOBS 974 if (WIFSTOPPED(status)) 975 sig = WSTOPSIG(status); 976 else 977 #endif 978 { 979 if (WIFEXITED(status)) 980 sig = 0; 981 else 982 sig = WTERMSIG(status); 983 } 984 if (sig != 0 && sig != SIGINT && sig != SIGPIPE) { 985 if (!mflag || 986 (thisjob->foreground && !WIFSTOPPED(status))) { 987 i = WTERMSIG(status); 988 if ((i & 0x7F) < NSIG && sys_siglist[i & 0x7F]) 989 out1str(sys_siglist[i & 0x7F]); 990 else 991 out1fmt("Signal %d", i & 0x7F); 992 if (WCOREDUMP(status)) 993 out1str(" (core dumped)"); 994 out1c('\n'); 995 } else 996 showjob(thisjob, pid, 0, 0); 997 } 998 } else { 999 TRACE(("Not printing status, rootshell=%d, job=%p\n", rootshell, job)); 1000 if (thisjob) 1001 thisjob->changed = 1; 1002 } 1003 return pid; 1004 } 1005 1006 1007 1008 /* 1009 * Do a wait system call. If job control is compiled in, we accept 1010 * stopped processes. If block is zero, we return a value of zero 1011 * rather than blocking. 1012 */ 1013 STATIC pid_t 1014 waitproc(int block, int *status) 1015 { 1016 int flags; 1017 1018 #if JOBS 1019 flags = WUNTRACED; 1020 #else 1021 flags = 0; 1022 #endif 1023 if (block == 0) 1024 flags |= WNOHANG; 1025 return wait3(status, flags, (struct rusage *)NULL); 1026 } 1027 1028 /* 1029 * return 1 if there are stopped jobs, otherwise 0 1030 */ 1031 int job_warning = 0; 1032 int 1033 stoppedjobs(void) 1034 { 1035 int jobno; 1036 struct job *jp; 1037 1038 if (job_warning) 1039 return (0); 1040 for (jobno = 1, jp = jobtab; jobno <= njobs; jobno++, jp++) { 1041 if (jp->used == 0) 1042 continue; 1043 if (jp->state == JOBSTOPPED) { 1044 out2str("You have stopped jobs.\n"); 1045 job_warning = 2; 1046 return (1); 1047 } 1048 } 1049 1050 return (0); 1051 } 1052 1053 /* 1054 * Return a string identifying a command (to be printed by the 1055 * jobs command. 1056 */ 1057 1058 STATIC char *cmdnextc; 1059 STATIC int cmdnleft; 1060 #define MAXCMDTEXT 200 1061 1062 char * 1063 commandtext(union node *n) 1064 { 1065 char *name; 1066 1067 cmdnextc = name = ckmalloc(MAXCMDTEXT); 1068 cmdnleft = MAXCMDTEXT - 4; 1069 cmdtxt(n); 1070 *cmdnextc = '\0'; 1071 return name; 1072 } 1073 1074 1075 STATIC void 1076 cmdtxt(union node *n) 1077 { 1078 union node *np; 1079 struct nodelist *lp; 1080 char *p; 1081 int i; 1082 char s[2]; 1083 1084 if (n == NULL) 1085 return; 1086 switch (n->type) { 1087 case NSEMI: 1088 cmdtxt(n->nbinary.ch1); 1089 cmdputs("; "); 1090 cmdtxt(n->nbinary.ch2); 1091 break; 1092 case NAND: 1093 cmdtxt(n->nbinary.ch1); 1094 cmdputs(" && "); 1095 cmdtxt(n->nbinary.ch2); 1096 break; 1097 case NOR: 1098 cmdtxt(n->nbinary.ch1); 1099 cmdputs(" || "); 1100 cmdtxt(n->nbinary.ch2); 1101 break; 1102 case NPIPE: 1103 for (lp = n->npipe.cmdlist ; lp ; lp = lp->next) { 1104 cmdtxt(lp->n); 1105 if (lp->next) 1106 cmdputs(" | "); 1107 } 1108 break; 1109 case NSUBSHELL: 1110 cmdputs("("); 1111 cmdtxt(n->nredir.n); 1112 cmdputs(")"); 1113 break; 1114 case NREDIR: 1115 case NBACKGND: 1116 cmdtxt(n->nredir.n); 1117 break; 1118 case NIF: 1119 cmdputs("if "); 1120 cmdtxt(n->nif.test); 1121 cmdputs("; then "); 1122 cmdtxt(n->nif.ifpart); 1123 cmdputs("..."); 1124 break; 1125 case NWHILE: 1126 cmdputs("while "); 1127 goto until; 1128 case NUNTIL: 1129 cmdputs("until "); 1130 until: 1131 cmdtxt(n->nbinary.ch1); 1132 cmdputs("; do "); 1133 cmdtxt(n->nbinary.ch2); 1134 cmdputs("; done"); 1135 break; 1136 case NFOR: 1137 cmdputs("for "); 1138 cmdputs(n->nfor.var); 1139 cmdputs(" in ..."); 1140 break; 1141 case NCASE: 1142 cmdputs("case "); 1143 cmdputs(n->ncase.expr->narg.text); 1144 cmdputs(" in ..."); 1145 break; 1146 case NDEFUN: 1147 cmdputs(n->narg.text); 1148 cmdputs("() ..."); 1149 break; 1150 case NCMD: 1151 for (np = n->ncmd.args ; np ; np = np->narg.next) { 1152 cmdtxt(np); 1153 if (np->narg.next) 1154 cmdputs(" "); 1155 } 1156 for (np = n->ncmd.redirect ; np ; np = np->nfile.next) { 1157 cmdputs(" "); 1158 cmdtxt(np); 1159 } 1160 break; 1161 case NARG: 1162 cmdputs(n->narg.text); 1163 break; 1164 case NTO: 1165 p = ">"; i = 1; goto redir; 1166 case NAPPEND: 1167 p = ">>"; i = 1; goto redir; 1168 case NTOFD: 1169 p = ">&"; i = 1; goto redir; 1170 case NCLOBBER: 1171 p = ">|"; i = 1; goto redir; 1172 case NFROM: 1173 p = "<"; i = 0; goto redir; 1174 case NFROMTO: 1175 p = "<>"; i = 0; goto redir; 1176 case NFROMFD: 1177 p = "<&"; i = 0; goto redir; 1178 redir: 1179 if (n->nfile.fd != i) { 1180 s[0] = n->nfile.fd + '0'; 1181 s[1] = '\0'; 1182 cmdputs(s); 1183 } 1184 cmdputs(p); 1185 if (n->type == NTOFD || n->type == NFROMFD) { 1186 if (n->ndup.dupfd >= 0) 1187 s[0] = n->ndup.dupfd + '0'; 1188 else 1189 s[0] = '-'; 1190 s[1] = '\0'; 1191 cmdputs(s); 1192 } else { 1193 cmdtxt(n->nfile.fname); 1194 } 1195 break; 1196 case NHERE: 1197 case NXHERE: 1198 cmdputs("<<..."); 1199 break; 1200 default: 1201 cmdputs("???"); 1202 break; 1203 } 1204 } 1205 1206 1207 1208 STATIC void 1209 cmdputs(char *s) 1210 { 1211 char *p, *q; 1212 char c; 1213 int subtype = 0; 1214 1215 if (cmdnleft <= 0) 1216 return; 1217 p = s; 1218 q = cmdnextc; 1219 while ((c = *p++) != '\0') { 1220 if (c == CTLESC) 1221 *q++ = *p++; 1222 else if (c == CTLVAR) { 1223 *q++ = '$'; 1224 if (--cmdnleft > 0) 1225 *q++ = '{'; 1226 subtype = *p++; 1227 } else if (c == '=' && subtype != 0) { 1228 *q++ = "}-+?="[(subtype & VSTYPE) - VSNORMAL]; 1229 subtype = 0; 1230 } else if (c == CTLENDVAR) { 1231 *q++ = '}'; 1232 } else if (c == CTLBACKQ || c == CTLBACKQ+CTLQUOTE) 1233 cmdnleft++; /* ignore it */ 1234 else 1235 *q++ = c; 1236 if (--cmdnleft <= 0) { 1237 *q++ = '.'; 1238 *q++ = '.'; 1239 *q++ = '.'; 1240 break; 1241 } 1242 } 1243 cmdnextc = q; 1244 } 1245