jobs.c revision 1.105
1 /* $NetBSD: jobs.c,v 1.105 2019/02/09 09:31:33 kre Exp $ */ 2 3 /*- 4 * Copyright (c) 1991, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * This code is derived from software contributed to Berkeley by 8 * Kenneth Almquist. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. Neither the name of the University nor the names of its contributors 19 * may be used to endorse or promote products derived from this software 20 * without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 */ 34 35 #include <sys/cdefs.h> 36 #ifndef lint 37 #if 0 38 static char sccsid[] = "@(#)jobs.c 8.5 (Berkeley) 5/4/95"; 39 #else 40 __RCSID("$NetBSD: jobs.c,v 1.105 2019/02/09 09:31:33 kre Exp $"); 41 #endif 42 #endif /* not lint */ 43 44 #include <stdio.h> 45 #include <fcntl.h> 46 #include <signal.h> 47 #include <errno.h> 48 #include <unistd.h> 49 #include <stdlib.h> 50 #include <paths.h> 51 #include <sys/types.h> 52 #include <sys/param.h> 53 #ifdef BSD 54 #include <sys/wait.h> 55 #include <sys/time.h> 56 #include <sys/resource.h> 57 #endif 58 #include <sys/ioctl.h> 59 60 #include "shell.h" 61 #if JOBS 62 #if OLD_TTY_DRIVER 63 #include "sgtty.h" 64 #else 65 #include <termios.h> 66 #endif 67 #undef CEOF /* syntax.h redefines this */ 68 #endif 69 #include "redir.h" 70 #include "show.h" 71 #include "main.h" 72 #include "parser.h" 73 #include "nodes.h" 74 #include "jobs.h" 75 #include "var.h" 76 #include "options.h" 77 #include "builtins.h" 78 #include "trap.h" 79 #include "syntax.h" 80 #include "input.h" 81 #include "output.h" 82 #include "memalloc.h" 83 #include "error.h" 84 #include "mystring.h" 85 86 87 #ifndef WCONTINUED 88 #define WCONTINUED 0 /* So we can compile on old systems */ 89 #endif 90 #ifndef WIFCONTINUED 91 #define WIFCONTINUED(x) (0) /* ditto */ 92 #endif 93 94 95 static struct job *jobtab; /* array of jobs */ 96 static int njobs; /* size of array */ 97 static int jobs_invalid; /* set in child */ 98 MKINIT pid_t backgndpid = -1; /* pid of last background process */ 99 #if JOBS 100 int initialpgrp; /* pgrp of shell on invocation */ 101 static int curjob = -1; /* current job */ 102 #endif 103 static int ttyfd = -1; 104 105 STATIC void restartjob(struct job *); 106 STATIC void freejob(struct job *); 107 STATIC struct job *getjob(const char *, int); 108 STATIC int dowait(int, struct job *, struct job **); 109 #define WBLOCK 1 110 #define WNOFREE 2 111 #define WSILENT 4 112 STATIC int jobstatus(const struct job *, int); 113 STATIC int waitproc(int, struct job *, int *); 114 STATIC void cmdtxt(union node *); 115 STATIC void cmdlist(union node *, int); 116 STATIC void cmdputs(const char *); 117 inline static void cmdputi(int); 118 119 #ifdef SYSV 120 STATIC int onsigchild(void); 121 #endif 122 123 #ifdef OLD_TTY_DRIVER 124 static pid_t tcgetpgrp(int fd); 125 static int tcsetpgrp(int fd, pid_t pgrp); 126 127 static pid_t 128 tcgetpgrp(int fd) 129 { 130 pid_t pgrp; 131 if (ioctl(fd, TIOCGPGRP, (char *)&pgrp) == -1) 132 return -1; 133 else 134 return pgrp; 135 } 136 137 static int 138 tcsetpgrp(int fd, pid_tpgrp) 139 { 140 return ioctl(fd, TIOCSPGRP, (char *)&pgrp); 141 } 142 #endif 143 144 static void 145 ttyfd_change(int from, int to) 146 { 147 if (ttyfd == from) 148 ttyfd = to; 149 } 150 151 /* 152 * Turn job control on and off. 153 * 154 * Note: This code assumes that the third arg to ioctl is a character 155 * pointer, which is true on Berkeley systems but not System V. Since 156 * System V doesn't have job control yet, this isn't a problem now. 157 */ 158 159 MKINIT int jobctl; 160 161 void 162 setjobctl(int on) 163 { 164 #ifdef OLD_TTY_DRIVER 165 int ldisc; 166 #endif 167 168 if (on == jobctl || rootshell == 0) 169 return; 170 if (on) { 171 #if defined(FIOCLEX) || defined(FD_CLOEXEC) 172 int i; 173 174 if (ttyfd != -1) 175 sh_close(ttyfd); 176 if ((ttyfd = open("/dev/tty", O_RDWR)) == -1) { 177 for (i = 0; i < 3; i++) { 178 if (isatty(i) && (ttyfd = dup(i)) != -1) 179 break; 180 } 181 if (i == 3) 182 goto out; 183 } 184 ttyfd = to_upper_fd(ttyfd); /* Move to a high fd */ 185 register_sh_fd(ttyfd, ttyfd_change); 186 #else 187 out2str("sh: Need FIOCLEX or FD_CLOEXEC to support job control"); 188 goto out; 189 #endif 190 do { /* while we are in the background */ 191 if ((initialpgrp = tcgetpgrp(ttyfd)) < 0) { 192 out: 193 out2str("sh: can't access tty; job control turned off\n"); 194 mflag = 0; 195 return; 196 } 197 if (initialpgrp == -1) 198 initialpgrp = getpgrp(); 199 else if (initialpgrp != getpgrp()) { 200 killpg(0, SIGTTIN); 201 continue; 202 } 203 } while (0); 204 205 #ifdef OLD_TTY_DRIVER 206 if (ioctl(ttyfd, TIOCGETD, (char *)&ldisc) < 0 207 || ldisc != NTTYDISC) { 208 out2str("sh: need new tty driver to run job control; job control turned off\n"); 209 mflag = 0; 210 return; 211 } 212 #endif 213 setsignal(SIGTSTP, 0); 214 setsignal(SIGTTOU, 0); 215 setsignal(SIGTTIN, 0); 216 if (getpgrp() != rootpid && setpgid(0, rootpid) == -1) 217 error("Cannot set process group (%s) at %d", 218 strerror(errno), __LINE__); 219 if (tcsetpgrp(ttyfd, rootpid) == -1) 220 error("Cannot set tty process group (%s) at %d", 221 strerror(errno), __LINE__); 222 } else { /* turning job control off */ 223 if (getpgrp() != initialpgrp && setpgid(0, initialpgrp) == -1) 224 error("Cannot set process group (%s) at %d", 225 strerror(errno), __LINE__); 226 if (tcsetpgrp(ttyfd, initialpgrp) == -1) 227 error("Cannot set tty process group (%s) at %d", 228 strerror(errno), __LINE__); 229 sh_close(ttyfd); 230 ttyfd = -1; 231 setsignal(SIGTSTP, 0); 232 setsignal(SIGTTOU, 0); 233 setsignal(SIGTTIN, 0); 234 } 235 jobctl = on; 236 } 237 238 239 #ifdef mkinit 240 INCLUDE <stdlib.h> 241 242 SHELLPROC { 243 backgndpid = -1; 244 #if JOBS 245 jobctl = 0; 246 #endif 247 } 248 249 #endif 250 251 252 253 #if JOBS 254 static int 255 do_fgcmd(const char *arg_ptr) 256 { 257 struct job *jp; 258 int i; 259 int status; 260 261 if (jobs_invalid) 262 error("No current jobs"); 263 jp = getjob(arg_ptr, 0); 264 if (jp->jobctl == 0) 265 error("job not created under job control"); 266 out1fmt("%s", jp->ps[0].cmd); 267 for (i = 1; i < jp->nprocs; i++) 268 out1fmt(" | %s", jp->ps[i].cmd ); 269 out1c('\n'); 270 flushall(); 271 272 for (i = 0; i < jp->nprocs; i++) 273 if (tcsetpgrp(ttyfd, jp->ps[i].pid) != -1) 274 break; 275 276 if (i >= jp->nprocs) { 277 error("Cannot set tty process group (%s) at %d", 278 strerror(errno), __LINE__); 279 } 280 INTOFF; 281 restartjob(jp); 282 status = waitforjob(jp); 283 INTON; 284 return status; 285 } 286 287 int 288 fgcmd(int argc, char **argv) 289 { 290 nextopt(""); 291 return do_fgcmd(*argptr); 292 } 293 294 int 295 fgcmd_percent(int argc, char **argv) 296 { 297 nextopt(""); 298 return do_fgcmd(*argv); 299 } 300 301 static void 302 set_curjob(struct job *jp, int mode) 303 { 304 struct job *jp1, *jp2; 305 int i, ji; 306 307 ji = jp - jobtab; 308 309 /* first remove from list */ 310 if (ji == curjob) 311 curjob = jp->prev_job; 312 else { 313 for (i = 0; i < njobs; i++) { 314 if (jobtab[i].prev_job != ji) 315 continue; 316 jobtab[i].prev_job = jp->prev_job; 317 break; 318 } 319 } 320 321 /* Then re-insert in correct position */ 322 switch (mode) { 323 case 0: /* job being deleted */ 324 jp->prev_job = -1; 325 break; 326 case 1: /* newly created job or backgrounded job, 327 put after all stopped jobs. */ 328 if (curjob != -1 && jobtab[curjob].state == JOBSTOPPED) { 329 for (jp1 = jobtab + curjob; ; jp1 = jp2) { 330 if (jp1->prev_job == -1) 331 break; 332 jp2 = jobtab + jp1->prev_job; 333 if (jp2->state != JOBSTOPPED) 334 break; 335 } 336 jp->prev_job = jp1->prev_job; 337 jp1->prev_job = ji; 338 break; 339 } 340 /* FALLTHROUGH */ 341 case 2: /* newly stopped job - becomes curjob */ 342 jp->prev_job = curjob; 343 curjob = ji; 344 break; 345 } 346 } 347 348 int 349 bgcmd(int argc, char **argv) 350 { 351 struct job *jp; 352 int i; 353 354 nextopt(""); 355 if (jobs_invalid) 356 error("No current jobs"); 357 do { 358 jp = getjob(*argptr, 0); 359 if (jp->jobctl == 0) 360 error("job not created under job control"); 361 set_curjob(jp, 1); 362 out1fmt("[%ld] %s", (long)(jp - jobtab + 1), jp->ps[0].cmd); 363 for (i = 1; i < jp->nprocs; i++) 364 out1fmt(" | %s", jp->ps[i].cmd ); 365 out1c('\n'); 366 flushall(); 367 restartjob(jp); 368 } while (*argptr && *++argptr); 369 return 0; 370 } 371 372 373 STATIC void 374 restartjob(struct job *jp) 375 { 376 struct procstat *ps; 377 int i, e; 378 379 if (jp->state == JOBDONE) 380 return; 381 INTOFF; 382 for (e = i = 0; i < jp->nprocs; i++) { 383 if (killpg(jp->ps[i].pid, SIGCONT) != -1) 384 break; 385 if (e == 0 && errno != ESRCH) 386 e = errno; 387 } 388 if (i >= jp->nprocs) 389 error("Cannot continue job (%s)", strerror(e ? e : ESRCH)); 390 for (ps = jp->ps, i = jp->nprocs ; --i >= 0 ; ps++) { 391 if (WIFSTOPPED(ps->status)) { 392 VTRACE(DBG_JOBS, ( 393 "restartjob: [%zu] pid %d status change" 394 " from %#x (stopped) to -1 (running)\n", 395 (size_t)(jp-jobtab+1), ps->pid, ps->status)); 396 ps->status = -1; 397 jp->state = JOBRUNNING; 398 } 399 } 400 INTON; 401 } 402 #endif 403 404 inline static void 405 cmdputi(int n) 406 { 407 char str[20]; 408 409 fmtstr(str, sizeof str, "%d", n); 410 cmdputs(str); 411 } 412 413 static void 414 showjob(struct output *out, struct job *jp, int mode) 415 { 416 int procno; 417 int st; 418 struct procstat *ps; 419 int col; 420 char s[64]; 421 422 #if JOBS 423 if (mode & SHOW_PGID) { 424 /* just output process (group) id of pipeline */ 425 outfmt(out, "%ld\n", (long)jp->ps->pid); 426 return; 427 } 428 #endif 429 430 procno = jp->nprocs; 431 if (!procno) 432 return; 433 434 if (mode & SHOW_PID) 435 mode |= SHOW_MULTILINE; 436 437 if ((procno > 1 && !(mode & SHOW_MULTILINE)) 438 || (mode & SHOW_SIGNALLED)) { 439 /* See if we have more than one status to report */ 440 ps = jp->ps; 441 st = ps->status; 442 do { 443 int st1 = ps->status; 444 if (st1 != st) 445 /* yes - need multi-line output */ 446 mode |= SHOW_MULTILINE; 447 if (st1 == -1 || !(mode & SHOW_SIGNALLED) || WIFEXITED(st1)) 448 continue; 449 if (WIFSTOPPED(st1) || ((st1 = WTERMSIG(st1) & 0x7f) 450 && st1 != SIGINT && st1 != SIGPIPE)) 451 mode |= SHOW_ISSIG; 452 453 } while (ps++, --procno); 454 procno = jp->nprocs; 455 } 456 457 if (mode & SHOW_SIGNALLED && !(mode & SHOW_ISSIG)) { 458 if (jp->state == JOBDONE && !(mode & SHOW_NO_FREE)) { 459 VTRACE(DBG_JOBS, ("showjob: freeing job %d\n", 460 jp - jobtab + 1)); 461 freejob(jp); 462 } 463 return; 464 } 465 466 for (ps = jp->ps; --procno >= 0; ps++) { /* for each process */ 467 if (ps == jp->ps) 468 fmtstr(s, 16, "[%ld] %c ", 469 (long)(jp - jobtab + 1), 470 #if JOBS 471 jp - jobtab == curjob ? 472 '+' : 473 curjob != -1 && 474 jp - jobtab == jobtab[curjob].prev_job ? 475 '-' : 476 #endif 477 ' '); 478 else 479 fmtstr(s, 16, " " ); 480 col = strlen(s); 481 if (mode & SHOW_PID) { 482 fmtstr(s + col, 16, "%ld ", (long)ps->pid); 483 col += strlen(s + col); 484 } 485 if (ps->status == -1) { 486 scopy("Running", s + col); 487 } else if (WIFEXITED(ps->status)) { 488 st = WEXITSTATUS(ps->status); 489 if (st) 490 fmtstr(s + col, 16, "Done(%d)", st); 491 else 492 fmtstr(s + col, 16, "Done"); 493 } else { 494 #if JOBS 495 if (WIFSTOPPED(ps->status)) 496 st = WSTOPSIG(ps->status); 497 else /* WIFSIGNALED(ps->status) */ 498 #endif 499 st = WTERMSIG(ps->status); 500 scopyn(strsignal(st), s + col, 32); 501 if (WCOREDUMP(ps->status)) { 502 col += strlen(s + col); 503 scopyn(" (core dumped)", s + col, 64 - col); 504 } 505 } 506 col += strlen(s + col); 507 outstr(s, out); 508 do { 509 outc(' ', out); 510 col++; 511 } while (col < 30); 512 outstr(ps->cmd, out); 513 if (mode & SHOW_MULTILINE) { 514 if (procno > 0) { 515 outc(' ', out); 516 outc('|', out); 517 } 518 } else { 519 while (--procno >= 0) 520 outfmt(out, " | %s", (++ps)->cmd ); 521 } 522 outc('\n', out); 523 } 524 flushout(out); 525 jp->flags &= ~JOBCHANGED; 526 if (jp->state == JOBDONE && !(mode & SHOW_NO_FREE)) 527 freejob(jp); 528 } 529 530 int 531 jobscmd(int argc, char **argv) 532 { 533 int mode, m; 534 535 mode = 0; 536 while ((m = nextopt("lp"))) 537 if (m == 'l') 538 mode = SHOW_PID; 539 else 540 mode = SHOW_PGID; 541 542 if (!iflag && !posix) 543 mode |= SHOW_NO_FREE; 544 545 if (*argptr) { 546 do 547 showjob(out1, getjob(*argptr,0), mode); 548 while (*++argptr); 549 } else 550 showjobs(out1, mode); 551 return 0; 552 } 553 554 555 /* 556 * Print a list of jobs. If "change" is nonzero, only print jobs whose 557 * statuses have changed since the last call to showjobs. 558 * 559 * If the shell is interrupted in the process of creating a job, the 560 * result may be a job structure containing zero processes. Such structures 561 * will be freed here. 562 */ 563 564 void 565 showjobs(struct output *out, int mode) 566 { 567 int jobno; 568 struct job *jp; 569 int silent = 0, gotpid; 570 571 CTRACE(DBG_JOBS, ("showjobs(%x) called\n", mode)); 572 573 /* If not even one one job changed, there is nothing to do */ 574 gotpid = dowait(WSILENT, NULL, NULL); 575 while (dowait(WSILENT, NULL, NULL) > 0) 576 continue; 577 #ifdef JOBS 578 /* 579 * Check if we are not in our foreground group, and if not 580 * put us in it. 581 */ 582 if (mflag && gotpid != -1 && tcgetpgrp(ttyfd) != getpid()) { 583 if (tcsetpgrp(ttyfd, getpid()) == -1) 584 error("Cannot set tty process group (%s) at %d", 585 strerror(errno), __LINE__); 586 VTRACE(DBG_JOBS|DBG_INPUT, ("repaired tty process group\n")); 587 silent = 1; 588 } 589 #endif 590 591 for (jobno = 1, jp = jobtab ; jobno <= njobs ; jobno++, jp++) { 592 if (!jp->used) 593 continue; 594 if (jp->nprocs == 0) { 595 if (!jobs_invalid) 596 freejob(jp); 597 continue; 598 } 599 if ((mode & SHOW_CHANGED) && !(jp->flags & JOBCHANGED)) 600 continue; 601 if (silent && (jp->flags & JOBCHANGED)) { 602 jp->flags &= ~JOBCHANGED; 603 continue; 604 } 605 showjob(out, jp, mode); 606 } 607 } 608 609 /* 610 * Mark a job structure as unused. 611 */ 612 613 STATIC void 614 freejob(struct job *jp) 615 { 616 INTOFF; 617 if (jp->ps != &jp->ps0) { 618 ckfree(jp->ps); 619 jp->ps = &jp->ps0; 620 } 621 jp->nprocs = 0; 622 jp->used = 0; 623 #if JOBS 624 set_curjob(jp, 0); 625 #endif 626 INTON; 627 } 628 629 /* 630 * Extract the status of a completed job (for $?) 631 */ 632 STATIC int 633 jobstatus(const struct job *jp, int raw) 634 { 635 int status = 0; 636 int retval; 637 638 if ((jp->flags & JPIPEFAIL) && jp->nprocs) { 639 int i; 640 641 for (i = 0; i < jp->nprocs; i++) 642 if (jp->ps[i].status != 0) 643 status = jp->ps[i].status; 644 } else 645 status = jp->ps[jp->nprocs ? jp->nprocs - 1 : 0].status; 646 647 if (raw) 648 return status; 649 650 if (WIFEXITED(status)) 651 retval = WEXITSTATUS(status); 652 #if JOBS 653 else if (WIFSTOPPED(status)) 654 retval = WSTOPSIG(status) + 128; 655 #endif 656 else { 657 /* XXX: limits number of signals */ 658 retval = WTERMSIG(status) + 128; 659 } 660 661 return retval; 662 } 663 664 665 666 int 667 waitcmd(int argc, char **argv) 668 { 669 struct job *job, *last; 670 int retval; 671 struct job *jp; 672 int i; 673 int any = 0; 674 int found; 675 char *pid = NULL, *fpid; 676 char **arg; 677 char idstring[20]; 678 679 while ((i = nextopt("np:")) != '\0') { 680 switch (i) { 681 case 'n': 682 any = 1; 683 break; 684 case 'p': 685 if (pid) 686 error("more than one -p unsupported"); 687 pid = optionarg; 688 break; 689 } 690 } 691 692 if (pid != NULL) { 693 if (!validname(pid, '\0', NULL)) 694 error("invalid name: -p '%s'", pid); 695 if (unsetvar(pid, 0)) 696 error("%s readonly", pid); 697 } 698 699 /* 700 * If we have forked, and not yet created any new jobs, then 701 * we have no children, whatever jobtab claims, 702 * so simply return in that case. 703 * 704 * The return code is 127 if we had any pid args (none are found) 705 * or if we had -n (nothing exited), but 0 for plain old "wait". 706 */ 707 if (jobs_invalid) { 708 CTRACE(DBG_WAIT, ("builtin wait%s%s in child, invalid jobtab\n", 709 any ? " -n" : "", *argptr ? " pid..." : "")); 710 return (any || *argptr) ? 127 : 0; 711 } 712 713 /* clear stray flags left from previous waitcmd */ 714 for (jp = jobtab, i = njobs ; --i >= 0 ; jp++) { 715 jp->flags &= ~JOBWANTED; 716 jp->ref = NULL; 717 } 718 719 CTRACE(DBG_WAIT, 720 ("builtin wait%s%s\n", any ? " -n" : "", *argptr ? " pid..." : "")); 721 722 /* 723 * First, validate the jobnum args, count how many refer to 724 * (different) running jobs, and if we had -n, and found that one has 725 * already finished, we return that one. Otherwise remember 726 * which ones we are looking for (JOBWANTED). 727 */ 728 found = 0; 729 last = NULL; 730 for (arg = argptr; *arg; arg++) { 731 last = jp = getjob(*arg, 1); 732 if (!jp) 733 continue; 734 if (jp->ref == NULL) 735 jp->ref = *arg; 736 if (any && jp->state == JOBDONE) { 737 /* 738 * We just want any of them, and this one is 739 * ready for consumption, bon apetit ... 740 */ 741 retval = jobstatus(jp, 0); 742 if (pid) 743 setvar(pid, *arg, 0); 744 if (!iflag) 745 freejob(jp); 746 CTRACE(DBG_WAIT, ("wait -n found %s already done: %d\n", *arg, retval)); 747 return retval; 748 } 749 if (!(jp->flags & JOBWANTED)) { 750 /* 751 * It is possible to list the same job several 752 * times - the obvious "wait 1 1 1" or 753 * "wait %% %2 102" where job 2 is current and pid 102 754 * However many times it is requested, it is found once. 755 */ 756 found++; 757 jp->flags |= JOBWANTED; 758 } 759 job = jp; 760 } 761 762 VTRACE(DBG_WAIT, ("wait %s%s%sfound %d candidates (last %s)\n", 763 any ? "-n " : "", *argptr ? *argptr : "", 764 argptr[0] && argptr[1] ? "... " : " ", found, 765 job ? (job->ref ? job->ref : "<no-arg>") : "none")); 766 767 /* 768 * If we were given a list of jobnums: 769 * and none of those exist, then we're done. 770 */ 771 if (*argptr && found == 0) 772 return 127; 773 774 /* 775 * Otherwise we need to wait for something to complete 776 * When it does, we check and see if it is one of the 777 * jobs we're waiting on, and if so, we clean it up. 778 * If we had -n, then we're done, otherwise we do it all again 779 * until all we had listed are done, of if there were no 780 * jobnum args, all are done. 781 */ 782 783 retval = any || *argptr ? 127 : 0; 784 fpid = NULL; 785 for (;;) { 786 VTRACE(DBG_WAIT, ("wait waiting (%d remain): ", found)); 787 for (jp = jobtab, i = njobs; --i >= 0; jp++) { 788 if (jp->used && jp->flags & JOBWANTED && 789 jp->state == JOBDONE) 790 break; 791 if (jp->used && jp->state == JOBRUNNING) 792 break; 793 } 794 if (i < 0) { 795 CTRACE(DBG_WAIT, ("nothing running (ret: %d) fpid %s\n", 796 retval, fpid ? fpid : "unset")); 797 if (pid && fpid) 798 setvar(pid, fpid, 0); 799 return retval; 800 } 801 VTRACE(DBG_WAIT, ("found @%d/%d state: %d\n", njobs-i, njobs, 802 jp->state)); 803 804 /* 805 * There is at least 1 job running, so we can 806 * safely wait() for something to exit. 807 */ 808 if (jp->state == JOBRUNNING) { 809 job = NULL; 810 if ((i = dowait(WBLOCK|WNOFREE, NULL, &job)) == -1) 811 return 128 + lastsig(); 812 813 /* 814 * one of the job's processes exited, 815 * but there are more 816 */ 817 if (job->state == JOBRUNNING) 818 continue; 819 } else 820 job = jp; /* we want this, and it is done */ 821 822 if (job->flags & JOBWANTED || (*argptr == 0 && any)) { 823 int rv; 824 825 job->flags &= ~JOBWANTED; /* got it */ 826 rv = jobstatus(job, 0); 827 VTRACE(DBG_WAIT, ( 828 "wanted %d (%s) done: st=%d", i, 829 job->ref ? job->ref : "", rv)); 830 if (any || job == last) { 831 retval = rv; 832 fpid = job->ref; 833 834 VTRACE(DBG_WAIT, (" save")); 835 if (pid) { 836 /* 837 * don't need fpid unless we are going 838 * to return it. 839 */ 840 if (fpid == NULL) { 841 /* 842 * this only happens with "wait -n" 843 * (that is, no pid args) 844 */ 845 snprintf(idstring, sizeof idstring, 846 "%d", job->ps[ job->nprocs ? 847 job->nprocs-1 : 848 0 ].pid); 849 fpid = idstring; 850 } 851 VTRACE(DBG_WAIT, (" (for %s)", fpid)); 852 } 853 } 854 855 if (job->state == JOBDONE) { 856 VTRACE(DBG_WAIT, (" free")); 857 freejob(job); 858 } 859 860 if (any || (found > 0 && --found == 0)) { 861 if (pid && fpid) 862 setvar(pid, fpid, 0); 863 VTRACE(DBG_WAIT, (" return %d\n", retval)); 864 return retval; 865 } 866 VTRACE(DBG_WAIT, ("\n")); 867 continue; 868 } 869 870 /* this is to handle "wait" (no args) */ 871 if (found == 0 && job->state == JOBDONE) { 872 VTRACE(DBG_JOBS|DBG_WAIT, ("Cleanup: %d\n", i)); 873 freejob(job); 874 } 875 } 876 } 877 878 879 int 880 jobidcmd(int argc, char **argv) 881 { 882 struct job *jp; 883 int i; 884 int pg = 0, onep = 0, job = 0; 885 886 while ((i = nextopt("gjp"))) { 887 switch (i) { 888 case 'g': pg = 1; break; 889 case 'j': job = 1; break; 890 case 'p': onep = 1; break; 891 } 892 } 893 CTRACE(DBG_JOBS, ("jobidcmd%s%s%s%s %s\n", pg ? " -g" : "", 894 onep ? " -p" : "", job ? " -j" : "", jobs_invalid ? " [inv]" : "", 895 *argptr ? *argptr : "<implicit %%>")); 896 if (pg + onep + job > 1) 897 error("-g -j and -p options cannot be combined"); 898 899 if (argptr[0] && argptr[1]) 900 error("usage: jobid [-g|-p|-r] jobid"); 901 902 jp = getjob(*argptr, 0); 903 if (job) { 904 out1fmt("%%%zu\n", (size_t)(jp - jobtab + 1)); 905 return 0; 906 } 907 if (pg) { 908 if (jp->pgrp != 0) { 909 out1fmt("%ld\n", (long)jp->pgrp); 910 return 0; 911 } 912 return 1; 913 } 914 if (onep) { 915 i = jp->nprocs - 1; 916 if (i < 0) 917 return 1; 918 out1fmt("%ld\n", (long)jp->ps[i].pid); 919 return 0; 920 } 921 for (i = 0 ; i < jp->nprocs ; ) { 922 out1fmt("%ld", (long)jp->ps[i].pid); 923 out1c(++i < jp->nprocs ? ' ' : '\n'); 924 } 925 return 0; 926 } 927 928 int 929 getjobpgrp(const char *name) 930 { 931 struct job *jp; 932 933 if (jobs_invalid) 934 error("No such job: %s", name); 935 jp = getjob(name, 1); 936 if (jp == 0) 937 return 0; 938 return -jp->ps[0].pid; 939 } 940 941 /* 942 * Convert a job name to a job structure. 943 */ 944 945 STATIC struct job * 946 getjob(const char *name, int noerror) 947 { 948 int jobno = -1; 949 struct job *jp; 950 int pid; 951 int i; 952 const char *err_msg = "No such job: %s"; 953 954 if (name == NULL) { 955 #if JOBS 956 jobno = curjob; 957 #endif 958 err_msg = "No current job"; 959 } else if (name[0] == '%') { 960 if (is_number(name + 1)) { 961 jobno = number(name + 1) - 1; 962 } else if (!name[1] || !name[2]) { 963 switch (name[1]) { 964 #if JOBS 965 case 0: 966 case '+': 967 case '%': 968 jobno = curjob; 969 err_msg = "No current job"; 970 break; 971 case '-': 972 jobno = curjob; 973 if (jobno != -1) 974 jobno = jobtab[jobno].prev_job; 975 err_msg = "No previous job"; 976 break; 977 #endif 978 default: 979 goto check_pattern; 980 } 981 } else { 982 struct job *found; 983 check_pattern: 984 found = NULL; 985 for (jp = jobtab, i = njobs ; --i >= 0 ; jp++) { 986 if (!jp->used || jp->nprocs <= 0) 987 continue; 988 if ((name[1] == '?' 989 && strstr(jp->ps[0].cmd, name + 2)) 990 || prefix(name + 1, jp->ps[0].cmd)) { 991 if (found) { 992 err_msg = "%s: ambiguous"; 993 found = 0; 994 break; 995 } 996 found = jp; 997 } 998 } 999 if (found) 1000 return found; 1001 } 1002 1003 } else if (is_number(name)) { 1004 pid = number(name); 1005 for (jp = jobtab, i = njobs ; --i >= 0 ; jp++) { 1006 if (jp->used && jp->nprocs > 0 1007 && jp->ps[jp->nprocs - 1].pid == pid) 1008 return jp; 1009 } 1010 } 1011 1012 if (jobno >= 0 && jobno < njobs) { 1013 jp = jobtab + jobno; 1014 if (jp->used) 1015 return jp; 1016 } 1017 if (!noerror) 1018 error(err_msg, name); 1019 return 0; 1020 } 1021 1022 1023 1024 /* 1025 * Return a new job structure, 1026 */ 1027 1028 struct job * 1029 makejob(union node *node, int nprocs) 1030 { 1031 int i; 1032 struct job *jp; 1033 1034 if (jobs_invalid) { 1035 for (i = njobs, jp = jobtab ; --i >= 0 ; jp++) { 1036 if (jp->used) 1037 freejob(jp); 1038 } 1039 jobs_invalid = 0; 1040 } 1041 1042 for (i = njobs, jp = jobtab ; ; jp++) { 1043 if (--i < 0) { 1044 INTOFF; 1045 if (njobs == 0) { 1046 jobtab = ckmalloc(4 * sizeof jobtab[0]); 1047 } else { 1048 jp = ckmalloc((njobs + 4) * sizeof jobtab[0]); 1049 memcpy(jp, jobtab, njobs * sizeof jp[0]); 1050 /* Relocate `ps' pointers */ 1051 for (i = 0; i < njobs; i++) 1052 if (jp[i].ps == &jobtab[i].ps0) 1053 jp[i].ps = &jp[i].ps0; 1054 ckfree(jobtab); 1055 jobtab = jp; 1056 } 1057 jp = jobtab + njobs; 1058 for (i = 4 ; --i >= 0 ; njobs++) { 1059 jobtab[njobs].used = 0; 1060 jobtab[njobs].prev_job = -1; 1061 } 1062 INTON; 1063 break; 1064 } 1065 if (jp->used == 0) 1066 break; 1067 } 1068 INTOFF; 1069 jp->state = JOBRUNNING; 1070 jp->used = 1; 1071 jp->flags = pipefail ? JPIPEFAIL : 0; 1072 jp->nprocs = 0; 1073 jp->pgrp = 0; 1074 #if JOBS 1075 jp->jobctl = jobctl; 1076 set_curjob(jp, 1); 1077 #endif 1078 if (nprocs > 1) { 1079 jp->ps = ckmalloc(nprocs * sizeof (struct procstat)); 1080 } else { 1081 jp->ps = &jp->ps0; 1082 } 1083 INTON; 1084 VTRACE(DBG_JOBS, ("makejob(%p, %d)%s returns %%%d\n", (void *)node, 1085 nprocs, (jp->flags&JPIPEFAIL)?" PF":"", jp - jobtab + 1)); 1086 return jp; 1087 } 1088 1089 1090 /* 1091 * Fork off a subshell. If we are doing job control, give the subshell its 1092 * own process group. Jp is a job structure that the job is to be added to. 1093 * N is the command that will be evaluated by the child. Both jp and n may 1094 * be NULL. The mode parameter can be one of the following: 1095 * FORK_FG - Fork off a foreground process. 1096 * FORK_BG - Fork off a background process. 1097 * FORK_NOJOB - Like FORK_FG, but don't give the process its own 1098 * process group even if job control is on. 1099 * 1100 * When job control is turned off, background processes have their standard 1101 * input redirected to /dev/null (except for the second and later processes 1102 * in a pipeline). 1103 */ 1104 1105 int 1106 forkshell(struct job *jp, union node *n, int mode) 1107 { 1108 pid_t pid; 1109 int serrno; 1110 1111 CTRACE(DBG_JOBS, ("forkshell(%%%d, %p, %d) called\n", 1112 jp - jobtab, n, mode)); 1113 1114 switch ((pid = fork())) { 1115 case -1: 1116 serrno = errno; 1117 VTRACE(DBG_JOBS, ("Fork failed, errno=%d\n", serrno)); 1118 error("Cannot fork (%s)", strerror(serrno)); 1119 break; 1120 case 0: 1121 SHELL_FORKED(); 1122 forkchild(jp, n, mode, 0); 1123 return 0; 1124 default: 1125 return forkparent(jp, n, mode, pid); 1126 } 1127 } 1128 1129 int 1130 forkparent(struct job *jp, union node *n, int mode, pid_t pid) 1131 { 1132 int pgrp; 1133 1134 if (rootshell && mode != FORK_NOJOB && mflag) { 1135 if (jp == NULL || jp->nprocs == 0) 1136 pgrp = pid; 1137 else 1138 pgrp = jp->ps[0].pid; 1139 jp->pgrp = pgrp; 1140 /* This can fail because we are doing it in the child also */ 1141 (void)setpgid(pid, pgrp); 1142 } 1143 if (mode == FORK_BG) 1144 backgndpid = pid; /* set $! */ 1145 if (jp) { 1146 struct procstat *ps = &jp->ps[jp->nprocs++]; 1147 ps->pid = pid; 1148 ps->status = -1; 1149 ps->cmd[0] = 0; 1150 if (/* iflag && rootshell && */ n) 1151 commandtext(ps, n); 1152 } 1153 CTRACE(DBG_JOBS, ("In parent shell: child = %d (mode %d)\n",pid,mode)); 1154 return pid; 1155 } 1156 1157 void 1158 forkchild(struct job *jp, union node *n, int mode, int vforked) 1159 { 1160 int wasroot; 1161 int pgrp; 1162 const char *devnull = _PATH_DEVNULL; 1163 const char *nullerr = "Can't open %s"; 1164 1165 wasroot = rootshell; 1166 CTRACE(DBG_JOBS, ("Child shell %d %sforked from %d (mode %d)\n", 1167 getpid(), vforked?"v":"", getppid(), mode)); 1168 1169 if (!vforked) { 1170 rootshell = 0; 1171 handler = &main_handler; 1172 } 1173 1174 closescript(vforked); 1175 clear_traps(vforked); 1176 #if JOBS 1177 if (!vforked) 1178 jobctl = 0; /* do job control only in root shell */ 1179 if (wasroot && mode != FORK_NOJOB && mflag) { 1180 if (jp == NULL || jp->nprocs == 0) 1181 pgrp = getpid(); 1182 else 1183 pgrp = jp->ps[0].pid; 1184 /* This can fail because we are doing it in the parent also */ 1185 (void)setpgid(0, pgrp); 1186 if (mode == FORK_FG) { 1187 if (tcsetpgrp(ttyfd, pgrp) == -1) 1188 error("Cannot set tty process group (%s) at %d", 1189 strerror(errno), __LINE__); 1190 } 1191 setsignal(SIGTSTP, vforked); 1192 setsignal(SIGTTOU, vforked); 1193 } else if (mode == FORK_BG) { 1194 ignoresig(SIGINT, vforked); 1195 ignoresig(SIGQUIT, vforked); 1196 if ((jp == NULL || jp->nprocs == 0) && 1197 ! fd0_redirected_p ()) { 1198 close(0); 1199 if (open(devnull, O_RDONLY) != 0) 1200 error(nullerr, devnull); 1201 } 1202 } 1203 #else 1204 if (mode == FORK_BG) { 1205 ignoresig(SIGINT, vforked); 1206 ignoresig(SIGQUIT, vforked); 1207 if ((jp == NULL || jp->nprocs == 0) && 1208 ! fd0_redirected_p ()) { 1209 close(0); 1210 if (open(devnull, O_RDONLY) != 0) 1211 error(nullerr, devnull); 1212 } 1213 } 1214 #endif 1215 if (wasroot && iflag) { 1216 setsignal(SIGINT, vforked); 1217 setsignal(SIGQUIT, vforked); 1218 setsignal(SIGTERM, vforked); 1219 } 1220 1221 if (!vforked) 1222 jobs_invalid = 1; 1223 } 1224 1225 /* 1226 * Wait for job to finish. 1227 * 1228 * Under job control we have the problem that while a child process is 1229 * running interrupts generated by the user are sent to the child but not 1230 * to the shell. This means that an infinite loop started by an inter- 1231 * active user may be hard to kill. With job control turned off, an 1232 * interactive user may place an interactive program inside a loop. If 1233 * the interactive program catches interrupts, the user doesn't want 1234 * these interrupts to also abort the loop. The approach we take here 1235 * is to have the shell ignore interrupt signals while waiting for a 1236 * forground process to terminate, and then send itself an interrupt 1237 * signal if the child process was terminated by an interrupt signal. 1238 * Unfortunately, some programs want to do a bit of cleanup and then 1239 * exit on interrupt; unless these processes terminate themselves by 1240 * sending a signal to themselves (instead of calling exit) they will 1241 * confuse this approach. 1242 */ 1243 1244 int 1245 waitforjob(struct job *jp) 1246 { 1247 #if JOBS 1248 int mypgrp = getpgrp(); 1249 #endif 1250 int status; 1251 int st; 1252 1253 INTOFF; 1254 VTRACE(DBG_JOBS, ("waitforjob(%%%d) called\n", jp - jobtab + 1)); 1255 while (jp->state == JOBRUNNING) { 1256 dowait(WBLOCK, jp, NULL); 1257 } 1258 #if JOBS 1259 if (jp->jobctl) { 1260 if (tcsetpgrp(ttyfd, mypgrp) == -1) 1261 error("Cannot set tty process group (%s) at %d", 1262 strerror(errno), __LINE__); 1263 } 1264 if (jp->state == JOBSTOPPED && curjob != jp - jobtab) 1265 set_curjob(jp, 2); 1266 #endif 1267 status = jobstatus(jp, 1); 1268 1269 /* convert to 8 bits */ 1270 if (WIFEXITED(status)) 1271 st = WEXITSTATUS(status); 1272 #if JOBS 1273 else if (WIFSTOPPED(status)) 1274 st = WSTOPSIG(status) + 128; 1275 #endif 1276 else 1277 st = WTERMSIG(status) + 128; 1278 1279 VTRACE(DBG_JOBS, ("waitforjob: job %d, nproc %d, status %d, st %x\n", 1280 jp - jobtab + 1, jp->nprocs, status, st)); 1281 #if JOBS 1282 if (jp->jobctl) { 1283 /* 1284 * This is truly gross. 1285 * If we're doing job control, then we did a TIOCSPGRP which 1286 * caused us (the shell) to no longer be in the controlling 1287 * session -- so we wouldn't have seen any ^C/SIGINT. So, we 1288 * intuit from the subprocess exit status whether a SIGINT 1289 * occurred, and if so interrupt ourselves. Yuck. - mycroft 1290 */ 1291 if (WIFSIGNALED(status) && WTERMSIG(status) == SIGINT) 1292 raise(SIGINT); 1293 } 1294 #endif 1295 if (! JOBS || jp->state == JOBDONE) 1296 freejob(jp); 1297 INTON; 1298 return st; 1299 } 1300 1301 1302 1303 /* 1304 * Wait for a process to terminate. 1305 */ 1306 1307 STATIC int 1308 dowait(int flags, struct job *job, struct job **changed) 1309 { 1310 int pid; 1311 int status; 1312 struct procstat *sp; 1313 struct job *jp; 1314 struct job *thisjob; 1315 int done; 1316 int stopped; 1317 1318 VTRACE(DBG_JOBS|DBG_PROCS, ("dowait(%x) called\n", flags)); 1319 1320 if (changed != NULL) 1321 *changed = NULL; 1322 1323 do { 1324 pid = waitproc(flags & WBLOCK, job, &status); 1325 VTRACE(DBG_JOBS|DBG_PROCS, ("wait returns pid %d, status %#x\n", 1326 pid, status)); 1327 } while (pid == -1 && errno == EINTR && pendingsigs == 0); 1328 if (pid <= 0) 1329 return pid; 1330 INTOFF; 1331 thisjob = NULL; 1332 for (jp = jobtab ; jp < jobtab + njobs ; jp++) { 1333 if (jp->used) { 1334 done = 1; 1335 stopped = 1; 1336 for (sp = jp->ps ; sp < jp->ps + jp->nprocs ; sp++) { 1337 if (sp->pid == -1) 1338 continue; 1339 if (sp->pid == pid && 1340 (sp->status==-1 || WIFSTOPPED(sp->status))) { 1341 VTRACE(DBG_JOBS | DBG_PROCS, 1342 ("Job %d: changing status of proc %d from %#x to %#x\n", 1343 jp - jobtab + 1, pid, 1344 sp->status, status)); 1345 if (WIFCONTINUED(status)) { 1346 if (sp->status != -1) 1347 jp->flags |= JOBCHANGED; 1348 sp->status = -1; 1349 jp->state = 0; 1350 } else 1351 sp->status = status; 1352 thisjob = jp; 1353 if (changed != NULL) 1354 *changed = jp; 1355 } 1356 if (sp->status == -1) 1357 stopped = 0; 1358 else if (WIFSTOPPED(sp->status)) 1359 done = 0; 1360 } 1361 if (stopped) { /* stopped or done */ 1362 int state = done ? JOBDONE : JOBSTOPPED; 1363 1364 if (jp->state != state) { 1365 VTRACE(DBG_JOBS, 1366 ("Job %d: changing state from %d to %d\n", 1367 jp - jobtab + 1, jp->state, state)); 1368 jp->state = state; 1369 #if JOBS 1370 if (done) 1371 set_curjob(jp, 0); 1372 #endif 1373 } 1374 } 1375 } 1376 } 1377 1378 if (thisjob && 1379 (thisjob->state != JOBRUNNING || thisjob->flags & JOBCHANGED)) { 1380 int mode = 0; 1381 1382 if (!rootshell || !iflag) 1383 mode = SHOW_SIGNALLED; 1384 if ((job == thisjob && (flags & WNOFREE) == 0) || 1385 job != thisjob) 1386 mode = SHOW_SIGNALLED | SHOW_NO_FREE; 1387 if (mode && (flags & WSILENT) == 0) 1388 showjob(out2, thisjob, mode); 1389 else { 1390 VTRACE(DBG_JOBS, 1391 ("Not printing status, rootshell=%d, job=%p\n", 1392 rootshell, job)); 1393 thisjob->flags |= JOBCHANGED; 1394 } 1395 } 1396 1397 INTON; 1398 return pid; 1399 } 1400 1401 1402 1403 /* 1404 * Do a wait system call. If job control is compiled in, we accept 1405 * stopped processes. If block is zero, we return a value of zero 1406 * rather than blocking. 1407 * 1408 * System V doesn't have a non-blocking wait system call. It does 1409 * have a SIGCLD signal that is sent to a process when one of its 1410 * children dies. The obvious way to use SIGCLD would be to install 1411 * a handler for SIGCLD which simply bumped a counter when a SIGCLD 1412 * was received, and have waitproc bump another counter when it got 1413 * the status of a process. Waitproc would then know that a wait 1414 * system call would not block if the two counters were different. 1415 * This approach doesn't work because if a process has children that 1416 * have not been waited for, System V will send it a SIGCLD when it 1417 * installs a signal handler for SIGCLD. What this means is that when 1418 * a child exits, the shell will be sent SIGCLD signals continuously 1419 * until is runs out of stack space, unless it does a wait call before 1420 * restoring the signal handler. The code below takes advantage of 1421 * this (mis)feature by installing a signal handler for SIGCLD and 1422 * then checking to see whether it was called. If there are any 1423 * children to be waited for, it will be. 1424 * 1425 * If neither SYSV nor BSD is defined, we don't implement nonblocking 1426 * waits at all. In this case, the user will not be informed when 1427 * a background process until the next time she runs a real program 1428 * (as opposed to running a builtin command or just typing return), 1429 * and the jobs command may give out of date information. 1430 */ 1431 1432 #ifdef SYSV 1433 STATIC int gotsigchild; 1434 1435 STATIC int onsigchild() { 1436 gotsigchild = 1; 1437 } 1438 #endif 1439 1440 1441 STATIC int 1442 waitproc(int block, struct job *jp, int *status) 1443 { 1444 #ifdef BSD 1445 int flags = 0; 1446 1447 #if JOBS 1448 if (mflag || (jp != NULL && jp->jobctl)) 1449 flags |= WUNTRACED | WCONTINUED; 1450 #endif 1451 if (block == 0) 1452 flags |= WNOHANG; 1453 VTRACE(DBG_WAIT, ("waitproc: doing waitpid(flags=%#x)\n", flags)); 1454 return waitpid(-1, status, flags); 1455 #else 1456 #ifdef SYSV 1457 int (*save)(); 1458 1459 if (block == 0) { 1460 gotsigchild = 0; 1461 save = signal(SIGCLD, onsigchild); 1462 signal(SIGCLD, save); 1463 if (gotsigchild == 0) 1464 return 0; 1465 } 1466 return wait(status); 1467 #else 1468 if (block == 0) 1469 return 0; 1470 return wait(status); 1471 #endif 1472 #endif 1473 } 1474 1475 /* 1476 * return 1 if there are stopped jobs, otherwise 0 1477 */ 1478 int job_warning = 0; 1479 int 1480 stoppedjobs(void) 1481 { 1482 int jobno; 1483 struct job *jp; 1484 1485 if (job_warning || jobs_invalid) 1486 return (0); 1487 for (jobno = 1, jp = jobtab; jobno <= njobs; jobno++, jp++) { 1488 if (jp->used == 0) 1489 continue; 1490 if (jp->state == JOBSTOPPED) { 1491 out2str("You have stopped jobs.\n"); 1492 job_warning = 2; 1493 return (1); 1494 } 1495 } 1496 1497 return (0); 1498 } 1499 1500 /* 1501 * Return a string identifying a command (to be printed by the 1502 * jobs command). 1503 */ 1504 1505 STATIC char *cmdnextc; 1506 STATIC int cmdnleft; 1507 1508 void 1509 commandtext(struct procstat *ps, union node *n) 1510 { 1511 int len; 1512 1513 cmdnextc = ps->cmd; 1514 if (iflag || mflag || sizeof(ps->cmd) <= 60) 1515 len = sizeof(ps->cmd); 1516 else if (sizeof ps->cmd <= 400) 1517 len = 50; 1518 else if (sizeof ps->cmd <= 800) 1519 len = 80; 1520 else 1521 len = sizeof(ps->cmd) / 10; 1522 cmdnleft = len; 1523 cmdtxt(n); 1524 if (cmdnleft <= 0) { 1525 char *p = ps->cmd + len - 4; 1526 p[0] = '.'; 1527 p[1] = '.'; 1528 p[2] = '.'; 1529 p[3] = 0; 1530 } else 1531 *cmdnextc = '\0'; 1532 1533 VTRACE(DBG_JOBS, 1534 ("commandtext: ps->cmd %p, end %p, left %d\n\t\"%s\"\n", 1535 ps->cmd, cmdnextc, cmdnleft, ps->cmd)); 1536 } 1537 1538 1539 STATIC void 1540 cmdtxt(union node *n) 1541 { 1542 union node *np; 1543 struct nodelist *lp; 1544 const char *p; 1545 int i; 1546 1547 if (n == NULL || cmdnleft <= 0) 1548 return; 1549 switch (n->type) { 1550 case NSEMI: 1551 cmdtxt(n->nbinary.ch1); 1552 cmdputs("; "); 1553 cmdtxt(n->nbinary.ch2); 1554 break; 1555 case NAND: 1556 cmdtxt(n->nbinary.ch1); 1557 cmdputs(" && "); 1558 cmdtxt(n->nbinary.ch2); 1559 break; 1560 case NOR: 1561 cmdtxt(n->nbinary.ch1); 1562 cmdputs(" || "); 1563 cmdtxt(n->nbinary.ch2); 1564 break; 1565 case NDNOT: 1566 cmdputs("! "); 1567 /* FALLTHROUGH */ 1568 case NNOT: 1569 cmdputs("! "); 1570 cmdtxt(n->nnot.com); 1571 break; 1572 case NPIPE: 1573 for (lp = n->npipe.cmdlist ; lp ; lp = lp->next) { 1574 cmdtxt(lp->n); 1575 if (lp->next) 1576 cmdputs(" | "); 1577 } 1578 if (n->npipe.backgnd) 1579 cmdputs(" &"); 1580 break; 1581 case NSUBSHELL: 1582 cmdputs("("); 1583 cmdtxt(n->nredir.n); 1584 cmdputs(")"); 1585 break; 1586 case NREDIR: 1587 case NBACKGND: 1588 cmdtxt(n->nredir.n); 1589 break; 1590 case NIF: 1591 cmdputs("if "); 1592 cmdtxt(n->nif.test); 1593 cmdputs("; then "); 1594 cmdtxt(n->nif.ifpart); 1595 if (n->nif.elsepart) { 1596 cmdputs("; else "); 1597 cmdtxt(n->nif.elsepart); 1598 } 1599 cmdputs("; fi"); 1600 break; 1601 case NWHILE: 1602 cmdputs("while "); 1603 goto until; 1604 case NUNTIL: 1605 cmdputs("until "); 1606 until: 1607 cmdtxt(n->nbinary.ch1); 1608 cmdputs("; do "); 1609 cmdtxt(n->nbinary.ch2); 1610 cmdputs("; done"); 1611 break; 1612 case NFOR: 1613 cmdputs("for "); 1614 cmdputs(n->nfor.var); 1615 cmdputs(" in "); 1616 cmdlist(n->nfor.args, 1); 1617 cmdputs("; do "); 1618 cmdtxt(n->nfor.body); 1619 cmdputs("; done"); 1620 break; 1621 case NCASE: 1622 cmdputs("case "); 1623 cmdputs(n->ncase.expr->narg.text); 1624 cmdputs(" in "); 1625 for (np = n->ncase.cases; np; np = np->nclist.next) { 1626 cmdtxt(np->nclist.pattern); 1627 cmdputs(") "); 1628 cmdtxt(np->nclist.body); 1629 switch (n->type) { /* switch (not if) for later */ 1630 case NCLISTCONT: 1631 cmdputs(";& "); 1632 break; 1633 default: 1634 cmdputs(";; "); 1635 break; 1636 } 1637 } 1638 cmdputs("esac"); 1639 break; 1640 case NDEFUN: 1641 cmdputs(n->narg.text); 1642 cmdputs("() { ... }"); 1643 break; 1644 case NCMD: 1645 cmdlist(n->ncmd.args, 1); 1646 cmdlist(n->ncmd.redirect, 0); 1647 if (n->ncmd.backgnd) 1648 cmdputs(" &"); 1649 break; 1650 case NARG: 1651 cmdputs(n->narg.text); 1652 break; 1653 case NTO: 1654 p = ">"; i = 1; goto redir; 1655 case NCLOBBER: 1656 p = ">|"; i = 1; goto redir; 1657 case NAPPEND: 1658 p = ">>"; i = 1; goto redir; 1659 case NTOFD: 1660 p = ">&"; i = 1; goto redir; 1661 case NFROM: 1662 p = "<"; i = 0; goto redir; 1663 case NFROMFD: 1664 p = "<&"; i = 0; goto redir; 1665 case NFROMTO: 1666 p = "<>"; i = 0; goto redir; 1667 redir: 1668 if (n->nfile.fd != i) 1669 cmdputi(n->nfile.fd); 1670 cmdputs(p); 1671 if (n->type == NTOFD || n->type == NFROMFD) { 1672 if (n->ndup.dupfd < 0) 1673 cmdputs("-"); 1674 else 1675 cmdputi(n->ndup.dupfd); 1676 } else { 1677 cmdtxt(n->nfile.fname); 1678 } 1679 break; 1680 case NHERE: 1681 case NXHERE: 1682 cmdputs("<<..."); 1683 break; 1684 default: 1685 cmdputs("???"); 1686 break; 1687 } 1688 } 1689 1690 STATIC void 1691 cmdlist(union node *np, int sep) 1692 { 1693 for (; np; np = np->narg.next) { 1694 if (!sep) 1695 cmdputs(" "); 1696 cmdtxt(np); 1697 if (sep && np->narg.next) 1698 cmdputs(" "); 1699 } 1700 } 1701 1702 1703 STATIC void 1704 cmdputs(const char *s) 1705 { 1706 const char *p, *str = 0; 1707 char c, cc[2] = " "; 1708 char *nextc; 1709 int nleft; 1710 int subtype = 0; 1711 int quoted = 0; 1712 static char vstype[16][4] = { "", "}", "-", "+", "?", "=", 1713 "#", "##", "%", "%%", "}" }; 1714 1715 p = s; 1716 nextc = cmdnextc; 1717 nleft = cmdnleft; 1718 while (nleft > 0 && (c = *p++) != 0) { 1719 switch (c) { 1720 case CTLNONL: 1721 c = '\0'; 1722 break; 1723 case CTLESC: 1724 c = *p++; 1725 break; 1726 case CTLVAR: 1727 subtype = *p++; 1728 if (subtype & VSLINENO) { /* undo LINENO hack */ 1729 if ((subtype & VSTYPE) == VSLENGTH) 1730 str = "${#LINENO"; /*}*/ 1731 else 1732 str = "${LINENO"; /*}*/ 1733 while (is_digit(*p)) 1734 p++; 1735 } else if ((subtype & VSTYPE) == VSLENGTH) 1736 str = "${#"; /*}*/ 1737 else 1738 str = "${"; /*}*/ 1739 if (!(subtype & VSQUOTE) != !(quoted & 1)) { 1740 quoted ^= 1; 1741 c = '"'; 1742 } else { 1743 c = *str++; 1744 } 1745 break; 1746 case CTLENDVAR: /*{*/ 1747 c = '}'; 1748 if (quoted & 1) 1749 str = "\""; 1750 quoted >>= 1; 1751 subtype = 0; 1752 break; 1753 case CTLBACKQ: 1754 c = '$'; 1755 str = "(...)"; 1756 break; 1757 case CTLBACKQ+CTLQUOTE: 1758 c = '"'; 1759 str = "$(...)\""; 1760 break; 1761 case CTLARI: 1762 c = '$'; 1763 if (*p == ' ') 1764 p++; 1765 str = "(("; /*))*/ 1766 break; 1767 case CTLENDARI: /*((*/ 1768 c = ')'; 1769 str = ")"; 1770 break; 1771 case CTLQUOTEMARK: 1772 quoted ^= 1; 1773 c = '"'; 1774 break; 1775 case CTLQUOTEEND: 1776 quoted >>= 1; 1777 c = '"'; 1778 break; 1779 case '=': 1780 if (subtype == 0) 1781 break; 1782 str = vstype[subtype & VSTYPE]; 1783 if (subtype & VSNUL) 1784 c = ':'; 1785 else 1786 c = *str++; /*{*/ 1787 if (c != '}') 1788 quoted <<= 1; 1789 else if (*p == CTLENDVAR) 1790 c = *str++; 1791 subtype = 0; 1792 break; 1793 case '\'': 1794 case '\\': 1795 case '"': 1796 case '$': 1797 /* These can only happen inside quotes */ 1798 cc[0] = c; 1799 str = cc; 1800 c = '\\'; 1801 break; 1802 default: 1803 break; 1804 } 1805 if (c != '\0') do { /* c == 0 implies nothing in str */ 1806 *nextc++ = c; 1807 } while (--nleft > 0 && str && (c = *str++)); 1808 str = 0; 1809 } 1810 if ((quoted & 1) && nleft) { 1811 *nextc++ = '"'; 1812 nleft--; 1813 } 1814 cmdnleft = nleft; 1815 cmdnextc = nextc; 1816 } 1817
Indexes created Thu Oct 02 07:10:07 GMT 2025