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 * %sccs.include.redist.c% 9 */ 10 11 #ifndef lint 12 static char sccsid[] = "@(#)jobs.c 8.5 (Berkeley) 05/04/95"; 13 #endif /* not lint */ 14 15 #include <fcntl.h> 16 #include <signal.h> 17 #include <errno.h> 18 #include <unistd.h> 19 #include <stdlib.h> 20 #include <sys/types.h> 21 #include <sys/param.h> 22 #ifdef BSD 23 #include <sys/wait.h> 24 #include <sys/time.h> 25 #include <sys/resource.h> 26 #endif 27 28 #include "shell.h" 29 #if JOBS 30 #include "sgtty.h" 31 #undef CEOF /* syntax.h redefines this */ 32 #endif 33 #include "redir.h" 34 #include "show.h" 35 #include "main.h" 36 #include "parser.h" 37 #include "nodes.h" 38 #include "jobs.h" 39 #include "options.h" 40 #include "trap.h" 41 #include "syntax.h" 42 #include "input.h" 43 #include "output.h" 44 #include "memalloc.h" 45 #include "error.h" 46 #include "mystring.h" 47 48 49 struct job *jobtab; /* array of jobs */ 50 int njobs; /* size of array */ 51 MKINIT short backgndpid = -1; /* pid of last background process */ 52 #if JOBS 53 int initialpgrp; /* pgrp of shell on invocation */ 54 short curjob; /* current job */ 55 #endif 56 57 STATIC void restartjob __P((struct job *)); 58 STATIC void freejob __P((struct job *)); 59 STATIC struct job *getjob __P((char *)); 60 STATIC int dowait __P((int, struct job *)); 61 STATIC int onsigchild __P((void)); 62 STATIC int waitproc __P((int, int *)); 63 STATIC void cmdtxt __P((union node *)); 64 STATIC void cmdputs __P((char *)); 65 66 67 /* 68 * Turn job control on and off. 69 * 70 * Note: This code assumes that the third arg to ioctl is a character 71 * pointer, which is true on Berkeley systems but not System V. Since 72 * System V doesn't have job control yet, this isn't a problem now. 73 */ 74 75 MKINIT int jobctl; 76 77 void 78 setjobctl(on) 79 int on; 80 { 81 #ifdef OLD_TTY_DRIVER 82 int ldisc; 83 #endif 84 85 if (on == jobctl || rootshell == 0) 86 return; 87 if (on) { 88 do { /* while we are in the background */ 89 if (ioctl(2, TIOCGPGRP, (char *)&initialpgrp) < 0) { 90 out2str("sh: can't access tty; job control turned off\n"); 91 mflag = 0; 92 return; 93 } 94 if (initialpgrp == -1) 95 initialpgrp = getpgrp(); 96 else if (initialpgrp != getpgrp()) { 97 killpg(initialpgrp, SIGTTIN); 98 continue; 99 } 100 } while (0); 101 #ifdef OLD_TTY_DRIVER 102 if (ioctl(2, TIOCGETD, (char *)&ldisc) < 0 || ldisc != NTTYDISC) { 103 out2str("sh: need new tty driver to run job control; job control turned off\n"); 104 mflag = 0; 105 return; 106 } 107 #endif 108 setsignal(SIGTSTP); 109 setsignal(SIGTTOU); 110 setsignal(SIGTTIN); 111 setpgid(0, rootpid); 112 ioctl(2, TIOCSPGRP, (char *)&rootpid); 113 } else { /* turning job control off */ 114 setpgid(0, initialpgrp); 115 ioctl(2, TIOCSPGRP, (char *)&initialpgrp); 116 setsignal(SIGTSTP); 117 setsignal(SIGTTOU); 118 setsignal(SIGTTIN); 119 } 120 jobctl = on; 121 } 122 123 124 #ifdef mkinit 125 INCLUDE <stdlib.h> 126 127 SHELLPROC { 128 backgndpid = -1; 129 #if JOBS 130 jobctl = 0; 131 #endif 132 } 133 134 #endif 135 136 137 138 #if JOBS 139 int 140 fgcmd(argc, argv) 141 int argc; 142 char **argv; 143 { 144 struct job *jp; 145 int pgrp; 146 int status; 147 148 jp = getjob(argv[1]); 149 if (jp->jobctl == 0) 150 error("job not created under job control"); 151 pgrp = jp->ps[0].pid; 152 ioctl(2, TIOCSPGRP, (char *)&pgrp); 153 restartjob(jp); 154 INTOFF; 155 status = waitforjob(jp); 156 INTON; 157 return status; 158 } 159 160 161 int 162 bgcmd(argc, argv) 163 int argc; 164 char **argv; 165 { 166 struct job *jp; 167 168 do { 169 jp = getjob(*++argv); 170 if (jp->jobctl == 0) 171 error("job not created under job control"); 172 restartjob(jp); 173 } while (--argc > 1); 174 return 0; 175 } 176 177 178 STATIC void 179 restartjob(jp) 180 struct job *jp; 181 { 182 struct procstat *ps; 183 int i; 184 185 if (jp->state == JOBDONE) 186 return; 187 INTOFF; 188 killpg(jp->ps[0].pid, SIGCONT); 189 for (ps = jp->ps, i = jp->nprocs ; --i >= 0 ; ps++) { 190 if ((ps->status & 0377) == 0177) { 191 ps->status = -1; 192 jp->state = 0; 193 } 194 } 195 INTON; 196 } 197 #endif 198 199 200 int 201 jobscmd(argc, argv) 202 int argc; 203 char **argv; 204 { 205 showjobs(0); 206 return 0; 207 } 208 209 210 /* 211 * Print a list of jobs. If "change" is nonzero, only print jobs whose 212 * statuses have changed since the last call to showjobs. 213 * 214 * If the shell is interrupted in the process of creating a job, the 215 * result may be a job structure containing zero processes. Such structures 216 * will be freed here. 217 */ 218 219 void 220 showjobs(change) 221 int change; 222 { 223 int jobno; 224 int procno; 225 int i; 226 struct job *jp; 227 struct procstat *ps; 228 int col; 229 char s[64]; 230 231 TRACE(("showjobs(%d) called\n", change)); 232 while (dowait(0, (struct job *)NULL) > 0); 233 for (jobno = 1, jp = jobtab ; jobno <= njobs ; jobno++, jp++) { 234 if (! jp->used) 235 continue; 236 if (jp->nprocs == 0) { 237 freejob(jp); 238 continue; 239 } 240 if (change && ! jp->changed) 241 continue; 242 procno = jp->nprocs; 243 for (ps = jp->ps ; ; ps++) { /* for each process */ 244 if (ps == jp->ps) 245 fmtstr(s, 64, "[%d] %d ", jobno, ps->pid); 246 else 247 fmtstr(s, 64, " %d ", ps->pid); 248 out1str(s); 249 col = strlen(s); 250 s[0] = '\0'; 251 if (ps->status == -1) { 252 /* don't print anything */ 253 } else if ((ps->status & 0xFF) == 0) { 254 fmtstr(s, 64, "Exit %d", ps->status >> 8); 255 } else { 256 i = ps->status; 257 #if JOBS 258 if ((i & 0xFF) == 0177) 259 i >>= 8; 260 #endif 261 if ((i & 0x7F) < NSIG && sys_siglist[i & 0x7F]) 262 scopy(sys_siglist[i & 0x7F], s); 263 else 264 fmtstr(s, 64, "Signal %d", i & 0x7F); 265 if (i & 0x80) 266 strcat(s, " (core dumped)"); 267 } 268 out1str(s); 269 col += strlen(s); 270 do { 271 out1c(' '); 272 col++; 273 } while (col < 30); 274 out1str(ps->cmd); 275 out1c('\n'); 276 if (--procno <= 0) 277 break; 278 } 279 jp->changed = 0; 280 if (jp->state == JOBDONE) { 281 freejob(jp); 282 } 283 } 284 } 285 286 287 /* 288 * Mark a job structure as unused. 289 */ 290 291 STATIC void 292 freejob(jp) 293 struct job *jp; 294 { 295 struct procstat *ps; 296 int i; 297 298 INTOFF; 299 for (i = jp->nprocs, ps = jp->ps ; --i >= 0 ; ps++) { 300 if (ps->cmd != nullstr) 301 ckfree(ps->cmd); 302 } 303 if (jp->ps != &jp->ps0) 304 ckfree(jp->ps); 305 jp->used = 0; 306 #if JOBS 307 if (curjob == jp - jobtab + 1) 308 curjob = 0; 309 #endif 310 INTON; 311 } 312 313 314 315 int 316 waitcmd(argc, argv) 317 int argc; 318 char **argv; 319 { 320 struct job *job; 321 int status; 322 struct job *jp; 323 324 if (argc > 1) { 325 job = getjob(argv[1]); 326 } else { 327 job = NULL; 328 } 329 for (;;) { /* loop until process terminated or stopped */ 330 if (job != NULL) { 331 if (job->state) { 332 status = job->ps[job->nprocs - 1].status; 333 if ((status & 0xFF) == 0) 334 status = status >> 8 & 0xFF; 335 #if JOBS 336 else if ((status & 0xFF) == 0177) 337 status = (status >> 8 & 0x7F) + 128; 338 #endif 339 else 340 status = (status & 0x7F) + 128; 341 if (! iflag) 342 freejob(job); 343 return status; 344 } 345 } else { 346 for (jp = jobtab ; ; jp++) { 347 if (jp >= jobtab + njobs) { /* no running procs */ 348 return 0; 349 } 350 if (jp->used && jp->state == 0) 351 break; 352 } 353 } 354 dowait(1, (struct job *)NULL); 355 } 356 } 357 358 359 360 int 361 jobidcmd(argc, argv) 362 int argc; 363 char **argv; 364 { 365 struct job *jp; 366 int i; 367 368 jp = getjob(argv[1]); 369 for (i = 0 ; i < jp->nprocs ; ) { 370 out1fmt("%d", jp->ps[i].pid); 371 out1c(++i < jp->nprocs? ' ' : '\n'); 372 } 373 return 0; 374 } 375 376 377 378 /* 379 * Convert a job name to a job structure. 380 */ 381 382 STATIC struct job * 383 getjob(name) 384 char *name; 385 { 386 int jobno; 387 register struct job *jp; 388 int pid; 389 int i; 390 391 if (name == NULL) { 392 #if JOBS 393 currentjob: 394 if ((jobno = curjob) == 0 || jobtab[jobno - 1].used == 0) 395 error("No current job"); 396 return &jobtab[jobno - 1]; 397 #else 398 error("No current job"); 399 #endif 400 } else if (name[0] == '%') { 401 if (is_digit(name[1])) { 402 jobno = number(name + 1); 403 if (jobno > 0 && jobno <= njobs 404 && jobtab[jobno - 1].used != 0) 405 return &jobtab[jobno - 1]; 406 #if JOBS 407 } else if (name[1] == '%' && name[2] == '\0') { 408 goto currentjob; 409 #endif 410 } else { 411 register struct job *found = NULL; 412 for (jp = jobtab, i = njobs ; --i >= 0 ; jp++) { 413 if (jp->used && jp->nprocs > 0 414 && prefix(name + 1, jp->ps[0].cmd)) { 415 if (found) 416 error("%s: ambiguous", name); 417 found = jp; 418 } 419 } 420 if (found) 421 return found; 422 } 423 } else if (is_number(name)) { 424 pid = number(name); 425 for (jp = jobtab, i = njobs ; --i >= 0 ; jp++) { 426 if (jp->used && jp->nprocs > 0 427 && jp->ps[jp->nprocs - 1].pid == pid) 428 return jp; 429 } 430 } 431 error("No such job: %s", name); 432 /*NOTREACHED*/ 433 return NULL; 434 } 435 436 437 438 /* 439 * Return a new job structure, 440 */ 441 442 struct job * 443 makejob(node, nprocs) 444 union node *node; 445 int nprocs; 446 { 447 int i; 448 struct job *jp; 449 450 for (i = njobs, jp = jobtab ; ; jp++) { 451 if (--i < 0) { 452 INTOFF; 453 if (njobs == 0) { 454 jobtab = ckmalloc(4 * sizeof jobtab[0]); 455 } else { 456 jp = ckmalloc((njobs + 4) * sizeof jobtab[0]); 457 memcpy(jp, jobtab, njobs * sizeof jp[0]); 458 ckfree(jobtab); 459 jobtab = jp; 460 } 461 jp = jobtab + njobs; 462 for (i = 4 ; --i >= 0 ; jobtab[njobs++].used = 0); 463 INTON; 464 break; 465 } 466 if (jp->used == 0) 467 break; 468 } 469 INTOFF; 470 jp->state = 0; 471 jp->used = 1; 472 jp->changed = 0; 473 jp->nprocs = 0; 474 #if JOBS 475 jp->jobctl = jobctl; 476 #endif 477 if (nprocs > 1) { 478 jp->ps = ckmalloc(nprocs * sizeof (struct procstat)); 479 } else { 480 jp->ps = &jp->ps0; 481 } 482 INTON; 483 TRACE(("makejob(0x%lx, %d) returns %%%d\n", (long)node, nprocs, 484 jp - jobtab + 1)); 485 return jp; 486 } 487 488 489 /* 490 * Fork of a subshell. If we are doing job control, give the subshell its 491 * own process group. Jp is a job structure that the job is to be added to. 492 * N is the command that will be evaluated by the child. Both jp and n may 493 * be NULL. The mode parameter can be one of the following: 494 * FORK_FG - Fork off a foreground process. 495 * FORK_BG - Fork off a background process. 496 * FORK_NOJOB - Like FORK_FG, but don't give the process its own 497 * process group even if job control is on. 498 * 499 * When job control is turned off, background processes have their standard 500 * input redirected to /dev/null (except for the second and later processes 501 * in a pipeline). 502 */ 503 504 int 505 forkshell(jp, n, mode) 506 union node *n; 507 struct job *jp; 508 int mode; 509 { 510 int pid; 511 int pgrp; 512 513 TRACE(("forkshell(%%%d, 0x%lx, %d) called\n", jp - jobtab, (long)n, 514 mode)); 515 INTOFF; 516 pid = fork(); 517 if (pid == -1) { 518 TRACE(("Fork failed, errno=%d\n", errno)); 519 INTON; 520 error("Cannot fork"); 521 } 522 if (pid == 0) { 523 struct job *p; 524 int wasroot; 525 int i; 526 527 TRACE(("Child shell %d\n", getpid())); 528 wasroot = rootshell; 529 rootshell = 0; 530 for (i = njobs, p = jobtab ; --i >= 0 ; p++) 531 if (p->used) 532 freejob(p); 533 closescript(); 534 INTON; 535 clear_traps(); 536 #if JOBS 537 jobctl = 0; /* do job control only in root shell */ 538 if (wasroot && mode != FORK_NOJOB && mflag) { 539 if (jp == NULL || jp->nprocs == 0) 540 pgrp = getpid(); 541 else 542 pgrp = jp->ps[0].pid; 543 setpgid(0, pgrp); 544 if (mode == FORK_FG) { 545 /*** this causes superfluous TIOCSPGRPS ***/ 546 if (ioctl(2, TIOCSPGRP, (char *)&pgrp) < 0) 547 error("TIOCSPGRP failed, errno=%d\n", errno); 548 } 549 setsignal(SIGTSTP); 550 setsignal(SIGTTOU); 551 } else if (mode == FORK_BG) { 552 ignoresig(SIGINT); 553 ignoresig(SIGQUIT); 554 if ((jp == NULL || jp->nprocs == 0) && 555 ! fd0_redirected_p ()) { 556 close(0); 557 if (open("/dev/null", O_RDONLY) != 0) 558 error("Can't open /dev/null"); 559 } 560 } 561 #else 562 if (mode == FORK_BG) { 563 ignoresig(SIGINT); 564 ignoresig(SIGQUIT); 565 if ((jp == NULL || jp->nprocs == 0) && 566 ! fd0_redirected_p ()) { 567 close(0); 568 if (open("/dev/null", O_RDONLY) != 0) 569 error("Can't open /dev/null"); 570 } 571 } 572 #endif 573 if (wasroot && iflag) { 574 setsignal(SIGINT); 575 setsignal(SIGQUIT); 576 setsignal(SIGTERM); 577 } 578 return pid; 579 } 580 if (rootshell && mode != FORK_NOJOB && mflag) { 581 if (jp == NULL || jp->nprocs == 0) 582 pgrp = pid; 583 else 584 pgrp = jp->ps[0].pid; 585 setpgid(pid, pgrp); 586 } 587 if (mode == FORK_BG) 588 backgndpid = pid; /* set $! */ 589 if (jp) { 590 struct procstat *ps = &jp->ps[jp->nprocs++]; 591 ps->pid = pid; 592 ps->status = -1; 593 ps->cmd = nullstr; 594 if (iflag && rootshell && n) 595 ps->cmd = commandtext(n); 596 } 597 INTON; 598 TRACE(("In parent shell: child = %d\n", pid)); 599 return pid; 600 } 601 602 603 604 /* 605 * Wait for job to finish. 606 * 607 * Under job control we have the problem that while a child process is 608 * running interrupts generated by the user are sent to the child but not 609 * to the shell. This means that an infinite loop started by an inter- 610 * active user may be hard to kill. With job control turned off, an 611 * interactive user may place an interactive program inside a loop. If 612 * the interactive program catches interrupts, the user doesn't want 613 * these interrupts to also abort the loop. The approach we take here 614 * is to have the shell ignore interrupt signals while waiting for a 615 * forground process to terminate, and then send itself an interrupt 616 * signal if the child process was terminated by an interrupt signal. 617 * Unfortunately, some programs want to do a bit of cleanup and then 618 * exit on interrupt; unless these processes terminate themselves by 619 * sending a signal to themselves (instead of calling exit) they will 620 * confuse this approach. 621 */ 622 623 int 624 waitforjob(jp) 625 register struct job *jp; 626 { 627 #if JOBS 628 int mypgrp = getpgrp(); 629 #endif 630 int status; 631 int st; 632 633 INTOFF; 634 TRACE(("waitforjob(%%%d) called\n", jp - jobtab + 1)); 635 while (jp->state == 0) { 636 dowait(1, jp); 637 } 638 #if JOBS 639 if (jp->jobctl) { 640 if (ioctl(2, TIOCSPGRP, (char *)&mypgrp) < 0) 641 error("TIOCSPGRP failed, errno=%d\n", errno); 642 } 643 if (jp->state == JOBSTOPPED) 644 curjob = jp - jobtab + 1; 645 #endif 646 status = jp->ps[jp->nprocs - 1].status; 647 /* convert to 8 bits */ 648 if ((status & 0xFF) == 0) 649 st = status >> 8 & 0xFF; 650 #if JOBS 651 else if ((status & 0xFF) == 0177) 652 st = (status >> 8 & 0x7F) + 128; 653 #endif 654 else 655 st = (status & 0x7F) + 128; 656 if (! JOBS || jp->state == JOBDONE) 657 freejob(jp); 658 CLEAR_PENDING_INT; 659 if ((status & 0x7F) == SIGINT) 660 kill(getpid(), SIGINT); 661 INTON; 662 return st; 663 } 664 665 666 667 /* 668 * Wait for a process to terminate. 669 */ 670 671 STATIC int 672 dowait(block, job) 673 int block; 674 struct job *job; 675 { 676 int pid; 677 int status; 678 struct procstat *sp; 679 struct job *jp; 680 struct job *thisjob; 681 int done; 682 int stopped; 683 int core; 684 685 TRACE(("dowait(%d) called\n", block)); 686 do { 687 pid = waitproc(block, &status); 688 TRACE(("wait returns %d, status=%d\n", pid, status)); 689 } while (pid == -1 && errno == EINTR); 690 if (pid <= 0) 691 return pid; 692 INTOFF; 693 thisjob = NULL; 694 for (jp = jobtab ; jp < jobtab + njobs ; jp++) { 695 if (jp->used) { 696 done = 1; 697 stopped = 1; 698 for (sp = jp->ps ; sp < jp->ps + jp->nprocs ; sp++) { 699 if (sp->pid == -1) 700 continue; 701 if (sp->pid == pid) { 702 TRACE(("Changin status of proc %d from 0x%x to 0x%x\n", pid, sp->status, status)); 703 sp->status = status; 704 thisjob = jp; 705 } 706 if (sp->status == -1) 707 stopped = 0; 708 else if ((sp->status & 0377) == 0177) 709 done = 0; 710 } 711 if (stopped) { /* stopped or done */ 712 int state = done? JOBDONE : JOBSTOPPED; 713 if (jp->state != state) { 714 TRACE(("Job %d: changing state from %d to %d\n", jp - jobtab + 1, jp->state, state)); 715 jp->state = state; 716 #if JOBS 717 if (done && curjob == jp - jobtab + 1) 718 curjob = 0; /* no current job */ 719 #endif 720 } 721 } 722 } 723 } 724 INTON; 725 if (! rootshell || ! iflag || (job && thisjob == job)) { 726 #if JOBS 727 if ((status & 0xFF) == 0177) 728 status >>= 8; 729 #endif 730 core = status & 0x80; 731 status &= 0x7F; 732 if (status != 0 && status != SIGINT && status != SIGPIPE) { 733 if (thisjob != job) 734 outfmt(out2, "%d: ", pid); 735 #if JOBS 736 if (status == SIGTSTP && rootshell && iflag) 737 outfmt(out2, "%%%d ", job - jobtab + 1); 738 #endif 739 if (status < NSIG && sys_siglist[status]) 740 out2str(sys_siglist[status]); 741 else 742 outfmt(out2, "Signal %d", status); 743 if (core) 744 out2str(" - core dumped"); 745 out2c('\n'); 746 flushout(&errout); 747 } else { 748 TRACE(("Not printing status: status=%d\n", status)); 749 } 750 } else { 751 TRACE(("Not printing status, rootshell=%d, job=0x%x\n", rootshell, job)); 752 if (thisjob) 753 thisjob->changed = 1; 754 } 755 return pid; 756 } 757 758 759 760 /* 761 * Do a wait system call. If job control is compiled in, we accept 762 * stopped processes. If block is zero, we return a value of zero 763 * rather than blocking. 764 * 765 * System V doesn't have a non-blocking wait system call. It does 766 * have a SIGCLD signal that is sent to a process when one of it's 767 * children dies. The obvious way to use SIGCLD would be to install 768 * a handler for SIGCLD which simply bumped a counter when a SIGCLD 769 * was received, and have waitproc bump another counter when it got 770 * the status of a process. Waitproc would then know that a wait 771 * system call would not block if the two counters were different. 772 * This approach doesn't work because if a process has children that 773 * have not been waited for, System V will send it a SIGCLD when it 774 * installs a signal handler for SIGCLD. What this means is that when 775 * a child exits, the shell will be sent SIGCLD signals continuously 776 * until is runs out of stack space, unless it does a wait call before 777 * restoring the signal handler. The code below takes advantage of 778 * this (mis)feature by installing a signal handler for SIGCLD and 779 * then checking to see whether it was called. If there are any 780 * children to be waited for, it will be. 781 * 782 * If neither SYSV nor BSD is defined, we don't implement nonblocking 783 * waits at all. In this case, the user will not be informed when 784 * a background process until the next time she runs a real program 785 * (as opposed to running a builtin command or just typing return), 786 * and the jobs command may give out of date information. 787 */ 788 789 #ifdef SYSV 790 STATIC int gotsigchild; 791 792 STATIC int onsigchild() { 793 gotsigchild = 1; 794 } 795 #endif 796 797 798 STATIC int 799 waitproc(block, status) 800 int block; 801 int *status; 802 { 803 #ifdef BSD 804 int flags; 805 806 #if JOBS 807 flags = WUNTRACED; 808 #else 809 flags = 0; 810 #endif 811 if (block == 0) 812 flags |= WNOHANG; 813 return wait3(status, flags, (struct rusage *)NULL); 814 #else 815 #ifdef SYSV 816 int (*save)(); 817 818 if (block == 0) { 819 gotsigchild = 0; 820 save = signal(SIGCLD, onsigchild); 821 signal(SIGCLD, save); 822 if (gotsigchild == 0) 823 return 0; 824 } 825 return wait(status); 826 #else 827 if (block == 0) 828 return 0; 829 return wait(status); 830 #endif 831 #endif 832 } 833 834 /* 835 * return 1 if there are stopped jobs, otherwise 0 836 */ 837 int job_warning = 0; 838 int 839 stoppedjobs() 840 { 841 register int jobno; 842 register struct job *jp; 843 844 if (job_warning) 845 return (0); 846 for (jobno = 1, jp = jobtab; jobno <= njobs; jobno++, jp++) { 847 if (jp->used == 0) 848 continue; 849 if (jp->state == JOBSTOPPED) { 850 out2str("You have stopped jobs.\n"); 851 job_warning = 2; 852 return (1); 853 } 854 } 855 856 return (0); 857 } 858 859 /* 860 * Return a string identifying a command (to be printed by the 861 * jobs command. 862 */ 863 864 STATIC char *cmdnextc; 865 STATIC int cmdnleft; 866 STATIC void cmdtxt(), cmdputs(); 867 #define MAXCMDTEXT 200 868 869 char * 870 commandtext(n) 871 union node *n; 872 { 873 char *name; 874 875 cmdnextc = name = ckmalloc(MAXCMDTEXT); 876 cmdnleft = MAXCMDTEXT - 4; 877 cmdtxt(n); 878 *cmdnextc = '\0'; 879 return name; 880 } 881 882 883 STATIC void 884 cmdtxt(n) 885 union node *n; 886 { 887 union node *np; 888 struct nodelist *lp; 889 char *p; 890 int i; 891 char s[2]; 892 893 if (n == NULL) 894 return; 895 switch (n->type) { 896 case NSEMI: 897 cmdtxt(n->nbinary.ch1); 898 cmdputs("; "); 899 cmdtxt(n->nbinary.ch2); 900 break; 901 case NAND: 902 cmdtxt(n->nbinary.ch1); 903 cmdputs(" && "); 904 cmdtxt(n->nbinary.ch2); 905 break; 906 case NOR: 907 cmdtxt(n->nbinary.ch1); 908 cmdputs(" || "); 909 cmdtxt(n->nbinary.ch2); 910 break; 911 case NPIPE: 912 for (lp = n->npipe.cmdlist ; lp ; lp = lp->next) { 913 cmdtxt(lp->n); 914 if (lp->next) 915 cmdputs(" | "); 916 } 917 break; 918 case NSUBSHELL: 919 cmdputs("("); 920 cmdtxt(n->nredir.n); 921 cmdputs(")"); 922 break; 923 case NREDIR: 924 case NBACKGND: 925 cmdtxt(n->nredir.n); 926 break; 927 case NIF: 928 cmdputs("if "); 929 cmdtxt(n->nif.test); 930 cmdputs("; then "); 931 cmdtxt(n->nif.ifpart); 932 cmdputs("..."); 933 break; 934 case NWHILE: 935 cmdputs("while "); 936 goto until; 937 case NUNTIL: 938 cmdputs("until "); 939 until: 940 cmdtxt(n->nbinary.ch1); 941 cmdputs("; do "); 942 cmdtxt(n->nbinary.ch2); 943 cmdputs("; done"); 944 break; 945 case NFOR: 946 cmdputs("for "); 947 cmdputs(n->nfor.var); 948 cmdputs(" in ..."); 949 break; 950 case NCASE: 951 cmdputs("case "); 952 cmdputs(n->ncase.expr->narg.text); 953 cmdputs(" in ..."); 954 break; 955 case NDEFUN: 956 cmdputs(n->narg.text); 957 cmdputs("() ..."); 958 break; 959 case NCMD: 960 for (np = n->ncmd.args ; np ; np = np->narg.next) { 961 cmdtxt(np); 962 if (np->narg.next) 963 cmdputs(" "); 964 } 965 for (np = n->ncmd.redirect ; np ; np = np->nfile.next) { 966 cmdputs(" "); 967 cmdtxt(np); 968 } 969 break; 970 case NARG: 971 cmdputs(n->narg.text); 972 break; 973 case NTO: 974 p = ">"; i = 1; goto redir; 975 case NAPPEND: 976 p = ">>"; i = 1; goto redir; 977 case NTOFD: 978 p = ">&"; i = 1; goto redir; 979 case NFROM: 980 p = "<"; i = 0; goto redir; 981 case NFROMFD: 982 p = "<&"; i = 0; goto redir; 983 redir: 984 if (n->nfile.fd != i) { 985 s[0] = n->nfile.fd + '0'; 986 s[1] = '\0'; 987 cmdputs(s); 988 } 989 cmdputs(p); 990 if (n->type == NTOFD || n->type == NFROMFD) { 991 s[0] = n->ndup.dupfd + '0'; 992 s[1] = '\0'; 993 cmdputs(s); 994 } else { 995 cmdtxt(n->nfile.fname); 996 } 997 break; 998 case NHERE: 999 case NXHERE: 1000 cmdputs("<<..."); 1001 break; 1002 default: 1003 cmdputs("???"); 1004 break; 1005 } 1006 } 1007 1008 1009 1010 STATIC void 1011 cmdputs(s) 1012 char *s; 1013 { 1014 register char *p, *q; 1015 register char c; 1016 int subtype = 0; 1017 1018 if (cmdnleft <= 0) 1019 return; 1020 p = s; 1021 q = cmdnextc; 1022 while ((c = *p++) != '\0') { 1023 if (c == CTLESC) 1024 *q++ = *p++; 1025 else if (c == CTLVAR) { 1026 *q++ = '$'; 1027 if (--cmdnleft > 0) 1028 *q++ = '{'; 1029 subtype = *p++; 1030 } else if (c == '=' && subtype != 0) { 1031 *q++ = "}-+?="[(subtype & VSTYPE) - VSNORMAL]; 1032 subtype = 0; 1033 } else if (c == CTLENDVAR) { 1034 *q++ = '}'; 1035 } else if (c == CTLBACKQ | c == CTLBACKQ+CTLQUOTE) 1036 cmdnleft++; /* ignore it */ 1037 else 1038 *q++ = c; 1039 if (--cmdnleft <= 0) { 1040 *q++ = '.'; 1041 *q++ = '.'; 1042 *q++ = '.'; 1043 break; 1044 } 1045 } 1046 cmdnextc = q; 1047 } 1048