1 /*- 2 * Copyright (c) 1991 The Regents of the University of California. 3 * 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 5.2 (Berkeley) 06/23/92"; 13 #endif /* not lint */ 14 15 #include "shell.h" 16 #if JOBS 17 #include "sgtty.h" 18 #undef CEOF /* syntax.h redefines this */ 19 #endif 20 #include "main.h" 21 #include "parser.h" 22 #include "nodes.h" 23 #include "jobs.h" 24 #include "options.h" 25 #include "trap.h" 26 #include "signames.h" 27 #include "syntax.h" 28 #include "input.h" 29 #include "output.h" 30 #include "memalloc.h" 31 #include "error.h" 32 #include "mystring.h" 33 #include <fcntl.h> 34 #include <signal.h> 35 #include <errno.h> 36 #ifdef BSD 37 #include <sys/types.h> 38 #include <sys/wait.h> 39 #include <sys/time.h> 40 #include <sys/resource.h> 41 #endif 42 43 44 45 struct job *jobtab; /* array of jobs */ 46 int njobs; /* size of array */ 47 MKINIT short backgndpid = -1; /* pid of last background process */ 48 #if JOBS 49 int initialpgrp; /* pgrp of shell on invocation */ 50 short curjob; /* current job */ 51 #endif 52 53 #ifdef __STDC__ 54 STATIC void restartjob(struct job *); 55 STATIC struct job *getjob(char *); 56 STATIC void freejob(struct job *); 57 STATIC int procrunning(int); 58 STATIC int dowait(int, struct job *); 59 STATIC int waitproc(int, int *); 60 STATIC char *commandtext(union node *); 61 #else 62 STATIC void restartjob(); 63 STATIC struct job *getjob(); 64 STATIC void freejob(); 65 STATIC int procrunning(); 66 STATIC int dowait(); 67 STATIC int waitproc(); 68 STATIC char *commandtext(); 69 #endif 70 71 72 73 #if JOBS 74 /* 75 * Turn job control on and off. 76 * 77 * Note: This code assumes that the third arg to ioctl is a character 78 * pointer, which is true on Berkeley systems but not System V. Since 79 * System V doesn't have job control yet, this isn't a problem now. 80 */ 81 82 MKINIT int jobctl; 83 84 void 85 setjobctl(on) { 86 int ldisc; 87 88 if (on == jobctl || rootshell == 0) 89 return; 90 if (on) { 91 do { /* while we are in the background */ 92 if (ioctl(2, TIOCGPGRP, (char *)&initialpgrp) < 0) { 93 out2str("ash: can't access tty; job control turned off\n"); 94 jflag = 0; 95 return; 96 } 97 if (initialpgrp == -1) 98 initialpgrp = getpgrp(0); 99 else if (initialpgrp != getpgrp(0)) { 100 killpg(initialpgrp, SIGTTIN); 101 continue; 102 } 103 } while (0); 104 if (ioctl(2, TIOCGETD, (char *)&ldisc) < 0 || ldisc != NTTYDISC) { 105 out2str("ash: need new tty driver to run job control; job control turned off\n"); 106 jflag = 0; 107 return; 108 } 109 setsignal(SIGTSTP); 110 setsignal(SIGTTOU); 111 setsignal(SIGTTIN); 112 setpgrp(0, rootpid); 113 ioctl(2, TIOCSPGRP, (char *)&rootpid); 114 } else { /* turning job control off */ 115 setpgrp(0, initialpgrp); 116 ioctl(2, TIOCSPGRP, (char *)&initialpgrp); 117 setsignal(SIGTSTP); 118 setsignal(SIGTTOU); 119 setsignal(SIGTTIN); 120 } 121 jobctl = on; 122 } 123 #endif 124 125 126 #ifdef mkinit 127 128 SHELLPROC { 129 backgndpid = -1; 130 #if JOBS 131 jobctl = 0; 132 #endif 133 } 134 135 #endif 136 137 138 139 #if JOBS 140 fgcmd(argc, argv) char **argv; { 141 struct job *jp; 142 int pgrp; 143 int status; 144 145 jp = getjob(argv[1]); 146 if (jp->jobctl == 0) 147 error("job not created under job control"); 148 pgrp = jp->ps[0].pid; 149 ioctl(2, TIOCSPGRP, (char *)&pgrp); 150 restartjob(jp); 151 INTOFF; 152 status = waitforjob(jp); 153 INTON; 154 return status; 155 } 156 157 158 bgcmd(argc, argv) char **argv; { 159 struct job *jp; 160 161 do { 162 jp = getjob(*++argv); 163 if (jp->jobctl == 0) 164 error("job not created under job control"); 165 restartjob(jp); 166 } while (--argc > 1); 167 return 0; 168 } 169 170 171 STATIC void 172 restartjob(jp) 173 struct job *jp; 174 { 175 struct procstat *ps; 176 int i; 177 178 if (jp->state == JOBDONE) 179 return; 180 INTOFF; 181 killpg(jp->ps[0].pid, SIGCONT); 182 for (ps = jp->ps, i = jp->nprocs ; --i >= 0 ; ps++) { 183 if ((ps->status & 0377) == 0177) { 184 ps->status = -1; 185 jp->state = 0; 186 } 187 } 188 INTON; 189 } 190 #endif 191 192 193 int 194 jobscmd(argc, argv) char **argv; { 195 showjobs(0); 196 return 0; 197 } 198 199 200 /* 201 * Print a list of jobs. If "change" is nonzero, only print jobs whose 202 * statuses have changed since the last call to showjobs. 203 * 204 * If the shell is interrupted in the process of creating a job, the 205 * result may be a job structure containing zero processes. Such structures 206 * will be freed here. 207 */ 208 209 void 210 showjobs(change) { 211 int jobno; 212 int procno; 213 int i; 214 struct job *jp; 215 struct procstat *ps; 216 int col; 217 char s[64]; 218 219 TRACE(("showjobs(%d) called\n", change)); 220 while (dowait(0, (struct job *)NULL) > 0); 221 for (jobno = 1, jp = jobtab ; jobno <= njobs ; jobno++, jp++) { 222 if (! jp->used) 223 continue; 224 if (jp->nprocs == 0) { 225 freejob(jp); 226 continue; 227 } 228 if (change && ! jp->changed) 229 continue; 230 procno = jp->nprocs; 231 for (ps = jp->ps ; ; ps++) { /* for each process */ 232 if (ps == jp->ps) 233 fmtstr(s, 64, "[%d] %d ", jobno, ps->pid); 234 else 235 fmtstr(s, 64, " %d ", ps->pid); 236 out1str(s); 237 col = strlen(s); 238 s[0] = '\0'; 239 if (ps->status == -1) { 240 /* don't print anything */ 241 } else if ((ps->status & 0xFF) == 0) { 242 fmtstr(s, 64, "Exit %d", ps->status >> 8); 243 } else { 244 i = ps->status; 245 #if JOBS 246 if ((i & 0xFF) == 0177) 247 i >>= 8; 248 #endif 249 if ((i & 0x7F) <= MAXSIG && sigmesg[i & 0x7F]) 250 scopy(sigmesg[i & 0x7F], s); 251 else 252 fmtstr(s, 64, "Signal %d", i & 0x7F); 253 if (i & 0x80) 254 strcat(s, " (core dumped)"); 255 } 256 out1str(s); 257 col += strlen(s); 258 do { 259 out1c(' '); 260 col++; 261 } while (col < 30); 262 out1str(ps->cmd); 263 out1c('\n'); 264 if (--procno <= 0) 265 break; 266 } 267 jp->changed = 0; 268 if (jp->state == JOBDONE) { 269 freejob(jp); 270 } 271 } 272 } 273 274 275 /* 276 * Mark a job structure as unused. 277 */ 278 279 STATIC void 280 freejob(jp) 281 struct job *jp; 282 { 283 struct procstat *ps; 284 int i; 285 286 INTOFF; 287 for (i = jp->nprocs, ps = jp->ps ; --i >= 0 ; ps++) { 288 if (ps->cmd != nullstr) 289 ckfree(ps->cmd); 290 } 291 if (jp->ps != &jp->ps0) 292 ckfree(jp->ps); 293 jp->used = 0; 294 #if JOBS 295 if (curjob == jp - jobtab + 1) 296 curjob = 0; 297 #endif 298 INTON; 299 } 300 301 302 303 int 304 waitcmd(argc, argv) char **argv; { 305 struct job *job; 306 int status; 307 struct job *jp; 308 309 if (argc > 1) { 310 job = getjob(argv[1]); 311 } else { 312 job = NULL; 313 } 314 for (;;) { /* loop until process terminated or stopped */ 315 if (job != NULL) { 316 if (job->state) { 317 status = job->ps[job->nprocs - 1].status; 318 if ((status & 0xFF) == 0) 319 status = status >> 8 & 0xFF; 320 #if JOBS 321 else if ((status & 0xFF) == 0177) 322 status = (status >> 8 & 0x7F) + 128; 323 #endif 324 else 325 status = (status & 0x7F) + 128; 326 if (! iflag) 327 freejob(job); 328 return status; 329 } 330 } else { 331 for (jp = jobtab ; ; jp++) { 332 if (jp >= jobtab + njobs) { /* no running procs */ 333 return 0; 334 } 335 if (jp->used && jp->state == 0) 336 break; 337 } 338 } 339 dowait(1, (struct job *)NULL); 340 } 341 } 342 343 344 345 jobidcmd(argc, argv) char **argv; { 346 struct job *jp; 347 int i; 348 349 jp = getjob(argv[1]); 350 for (i = 0 ; i < jp->nprocs ; ) { 351 out1fmt("%d", jp->ps[i].pid); 352 out1c(++i < jp->nprocs? ' ' : '\n'); 353 } 354 return 0; 355 } 356 357 358 359 /* 360 * Convert a job name to a job structure. 361 */ 362 363 STATIC struct job * 364 getjob(name) 365 char *name; 366 { 367 int jobno; 368 register struct job *jp; 369 int pid; 370 int i; 371 372 if (name == NULL) { 373 #if JOBS 374 currentjob: 375 if ((jobno = curjob) == 0 || jobtab[jobno - 1].used == 0) 376 error("No current job"); 377 return &jobtab[jobno - 1]; 378 #else 379 error("No current job"); 380 #endif 381 } else if (name[0] == '%') { 382 if (is_digit(name[1])) { 383 jobno = number(name + 1); 384 if (jobno > 0 && jobno <= njobs 385 && jobtab[jobno - 1].used != 0) 386 return &jobtab[jobno - 1]; 387 #if JOBS 388 } else if (name[1] == '%' && name[2] == '\0') { 389 goto currentjob; 390 #endif 391 } else { 392 register struct job *found = NULL; 393 for (jp = jobtab, i = njobs ; --i >= 0 ; jp++) { 394 if (jp->used && jp->nprocs > 0 395 && prefix(name + 1, jp->ps[0].cmd)) { 396 if (found) 397 error("%s: ambiguous", name); 398 found = jp; 399 } 400 } 401 if (found) 402 return found; 403 } 404 } else if (is_number(name)) { 405 pid = number(name); 406 for (jp = jobtab, i = njobs ; --i >= 0 ; jp++) { 407 if (jp->used && jp->nprocs > 0 408 && jp->ps[jp->nprocs - 1].pid == pid) 409 return jp; 410 } 411 } 412 error("No such job: %s", name); 413 } 414 415 416 417 /* 418 * Return a new job structure, 419 */ 420 421 struct job * 422 makejob(node, nprocs) 423 union node *node; 424 { 425 int i; 426 struct job *jp; 427 428 for (i = njobs, jp = jobtab ; ; jp++) { 429 if (--i < 0) { 430 INTOFF; 431 if (njobs == 0) { 432 jobtab = ckmalloc(4 * sizeof jobtab[0]); 433 } else { 434 jp = ckmalloc((njobs + 4) * sizeof jobtab[0]); 435 bcopy(jobtab, jp, njobs * sizeof jp[0]); 436 ckfree(jobtab); 437 jobtab = jp; 438 } 439 jp = jobtab + njobs; 440 for (i = 4 ; --i >= 0 ; jobtab[njobs++].used = 0); 441 INTON; 442 break; 443 } 444 if (jp->used == 0) 445 break; 446 } 447 INTOFF; 448 jp->state = 0; 449 jp->used = 1; 450 jp->changed = 0; 451 jp->nprocs = 0; 452 #if JOBS 453 jp->jobctl = jobctl; 454 #endif 455 if (nprocs > 1) { 456 jp->ps = ckmalloc(nprocs * sizeof (struct procstat)); 457 } else { 458 jp->ps = &jp->ps0; 459 } 460 INTON; 461 TRACE(("makejob(0x%x, %d) returns %%%d\n", (int)node, nprocs, jp - jobtab + 1)); 462 return jp; 463 } 464 465 466 /* 467 * Fork of a subshell. If we are doing job control, give the subshell its 468 * own process group. Jp is a job structure that the job is to be added to. 469 * N is the command that will be evaluated by the child. Both jp and n may 470 * be NULL. The mode parameter can be one of the following: 471 * FORK_FG - Fork off a foreground process. 472 * FORK_BG - Fork off a background process. 473 * FORK_NOJOB - Like FORK_FG, but don't give the process its own 474 * process group even if job control is on. 475 * 476 * When job control is turned off, background processes have their standard 477 * input redirected to /dev/null (except for the second and later processes 478 * in a pipeline). 479 */ 480 481 int 482 forkshell(jp, n, mode) 483 union node *n; 484 struct job *jp; 485 { 486 int pid; 487 int pgrp; 488 489 TRACE(("forkshell(%%%d, 0x%x, %d) called\n", jp - jobtab, (int)n, mode)); 490 INTOFF; 491 pid = fork(); 492 if (pid == -1) { 493 TRACE(("Fork failed, errno=%d\n", errno)); 494 INTON; 495 error("Cannot fork"); 496 } 497 if (pid == 0) { 498 struct job *p; 499 int wasroot; 500 int i; 501 502 TRACE(("Child shell %d\n", getpid())); 503 wasroot = rootshell; 504 rootshell = 0; 505 for (i = njobs, p = jobtab ; --i >= 0 ; p++) 506 if (p->used) 507 freejob(p); 508 closescript(); 509 INTON; 510 clear_traps(); 511 #if JOBS 512 jobctl = 0; /* do job control only in root shell */ 513 if (wasroot && mode != FORK_NOJOB && jflag) { 514 if (jp == NULL || jp->nprocs == 0) 515 pgrp = getpid(); 516 else 517 pgrp = jp->ps[0].pid; 518 setpgrp(0, pgrp); 519 if (mode == FORK_FG) { 520 /*** this causes superfluous TIOCSPGRPS ***/ 521 if (ioctl(2, TIOCSPGRP, (char *)&pgrp) < 0) 522 error("TIOCSPGRP failed, errno=%d\n", errno); 523 } 524 setsignal(SIGTSTP); 525 setsignal(SIGTTOU); 526 } else if (mode == FORK_BG) { 527 ignoresig(SIGINT); 528 ignoresig(SIGQUIT); 529 if (jp == NULL || jp->nprocs == 0) { 530 close(0); 531 if (open("/dev/null", O_RDONLY) != 0) 532 error("Can't open /dev/null"); 533 } 534 } 535 #else 536 if (mode == FORK_BG) { 537 ignoresig(SIGINT); 538 ignoresig(SIGQUIT); 539 if (jp == NULL || jp->nprocs == 0) { 540 close(0); 541 if (open("/dev/null", O_RDONLY) != 0) 542 error("Can't open /dev/null"); 543 } 544 } 545 #endif 546 if (wasroot && iflag) { 547 setsignal(SIGINT); 548 setsignal(SIGQUIT); 549 setsignal(SIGTERM); 550 } 551 return pid; 552 } 553 if (rootshell && mode != FORK_NOJOB && jflag) { 554 if (jp == NULL || jp->nprocs == 0) 555 pgrp = pid; 556 else 557 pgrp = jp->ps[0].pid; 558 setpgrp(pid, pgrp); 559 } 560 if (mode == FORK_BG) 561 backgndpid = pid; /* set $! */ 562 if (jp) { 563 struct procstat *ps = &jp->ps[jp->nprocs++]; 564 ps->pid = pid; 565 ps->status = -1; 566 ps->cmd = nullstr; 567 if (iflag && rootshell && n) 568 ps->cmd = commandtext(n); 569 } 570 INTON; 571 TRACE(("In parent shell: child = %d\n", pid)); 572 return pid; 573 } 574 575 576 577 /* 578 * Wait for job to finish. 579 * 580 * Under job control we have the problem that while a child process is 581 * running interrupts generated by the user are sent to the child but not 582 * to the shell. This means that an infinite loop started by an inter- 583 * active user may be hard to kill. With job control turned off, an 584 * interactive user may place an interactive program inside a loop. If 585 * the interactive program catches interrupts, the user doesn't want 586 * these interrupts to also abort the loop. The approach we take here 587 * is to have the shell ignore interrupt signals while waiting for a 588 * forground process to terminate, and then send itself an interrupt 589 * signal if the child process was terminated by an interrupt signal. 590 * Unfortunately, some programs want to do a bit of cleanup and then 591 * exit on interrupt; unless these processes terminate themselves by 592 * sending a signal to themselves (instead of calling exit) they will 593 * confuse this approach. 594 */ 595 596 int 597 waitforjob(jp) 598 register struct job *jp; 599 { 600 #if JOBS 601 int mypgrp = getpgrp(0); 602 #endif 603 int status; 604 int st; 605 606 INTOFF; 607 TRACE(("waitforjob(%%%d) called\n", jp - jobtab + 1)); 608 while (jp->state == 0) { 609 dowait(1, jp); 610 } 611 #if JOBS 612 if (jp->jobctl) { 613 if (ioctl(2, TIOCSPGRP, (char *)&mypgrp) < 0) 614 error("TIOCSPGRP failed, errno=%d\n", errno); 615 } 616 if (jp->state == JOBSTOPPED) 617 curjob = jp - jobtab + 1; 618 #endif 619 status = jp->ps[jp->nprocs - 1].status; 620 /* convert to 8 bits */ 621 if ((status & 0xFF) == 0) 622 st = status >> 8 & 0xFF; 623 #if JOBS 624 else if ((status & 0xFF) == 0177) 625 st = (status >> 8 & 0x7F) + 128; 626 #endif 627 else 628 st = (status & 0x7F) + 128; 629 if (! JOBS || jp->state == JOBDONE) 630 freejob(jp); 631 CLEAR_PENDING_INT; 632 if ((status & 0x7F) == SIGINT) 633 kill(getpid(), SIGINT); 634 INTON; 635 return st; 636 } 637 638 639 640 /* 641 * Wait for a process to terminate. 642 */ 643 644 STATIC int 645 dowait(block, job) 646 struct job *job; 647 { 648 int pid; 649 int status; 650 struct procstat *sp; 651 struct job *jp; 652 struct job *thisjob; 653 int done; 654 int stopped; 655 int core; 656 657 TRACE(("dowait(%d) called\n", block)); 658 do { 659 pid = waitproc(block, &status); 660 TRACE(("wait returns %d, status=%d\n", pid, status)); 661 } while (pid == -1 && errno == EINTR); 662 if (pid <= 0) 663 return pid; 664 INTOFF; 665 thisjob = NULL; 666 for (jp = jobtab ; jp < jobtab + njobs ; jp++) { 667 if (jp->used) { 668 done = 1; 669 stopped = 1; 670 for (sp = jp->ps ; sp < jp->ps + jp->nprocs ; sp++) { 671 if (sp->pid == -1) 672 continue; 673 if (sp->pid == pid) { 674 TRACE(("Changin status of proc %d from 0x%x to 0x%x\n", pid, sp->status, status)); 675 sp->status = status; 676 thisjob = jp; 677 } 678 if (sp->status == -1) 679 stopped = 0; 680 else if ((sp->status & 0377) == 0177) 681 done = 0; 682 } 683 if (stopped) { /* stopped or done */ 684 int state = done? JOBDONE : JOBSTOPPED; 685 if (jp->state != state) { 686 TRACE(("Job %d: changing state from %d to %d\n", jp - jobtab + 1, jp->state, state)); 687 jp->state = state; 688 #if JOBS 689 if (done && curjob == jp - jobtab + 1) 690 curjob = 0; /* no current job */ 691 #endif 692 } 693 } 694 } 695 } 696 INTON; 697 if (! rootshell || ! iflag || (job && thisjob == job)) { 698 #if JOBS 699 if ((status & 0xFF) == 0177) 700 status >>= 8; 701 #endif 702 core = status & 0x80; 703 status &= 0x7F; 704 if (status != 0 && status != SIGINT && status != SIGPIPE) { 705 if (thisjob != job) 706 outfmt(out2, "%d: ", pid); 707 #if JOBS 708 if (status == SIGTSTP && rootshell && iflag) 709 outfmt(out2, "%%%d ", job - jobtab + 1); 710 #endif 711 if (status <= MAXSIG && sigmesg[status]) 712 out2str(sigmesg[status]); 713 else 714 outfmt(out2, "Signal %d", status); 715 if (core) 716 out2str(" - core dumped"); 717 out2c('\n'); 718 flushout(&errout); 719 } else { 720 TRACE(("Not printing status: status=%d\n", status)); 721 } 722 } else { 723 TRACE(("Not printing status, rootshell=%d, job=0x%x\n", rootshell, job)); 724 if (thisjob) 725 thisjob->changed = 1; 726 } 727 return pid; 728 } 729 730 731 732 /* 733 * Do a wait system call. If job control is compiled in, we accept 734 * stopped processes. If block is zero, we return a value of zero 735 * rather than blocking. 736 * 737 * System V doesn't have a non-blocking wait system call. It does 738 * have a SIGCLD signal that is sent to a process when one of it's 739 * children dies. The obvious way to use SIGCLD would be to install 740 * a handler for SIGCLD which simply bumped a counter when a SIGCLD 741 * was received, and have waitproc bump another counter when it got 742 * the status of a process. Waitproc would then know that a wait 743 * system call would not block if the two counters were different. 744 * This approach doesn't work because if a process has children that 745 * have not been waited for, System V will send it a SIGCLD when it 746 * installs a signal handler for SIGCLD. What this means is that when 747 * a child exits, the shell will be sent SIGCLD signals continuously 748 * until is runs out of stack space, unless it does a wait call before 749 * restoring the signal handler. The code below takes advantage of 750 * this (mis)feature by installing a signal handler for SIGCLD and 751 * then checking to see whether it was called. If there are any 752 * children to be waited for, it will be. 753 * 754 * If neither SYSV nor BSD is defined, we don't implement nonblocking 755 * waits at all. In this case, the user will not be informed when 756 * a background process until the next time she runs a real program 757 * (as opposed to running a builtin command or just typing return), 758 * and the jobs command may give out of date information. 759 */ 760 761 #ifdef SYSV 762 STATIC int gotsigchild; 763 764 STATIC int onsigchild() { 765 gotsigchild = 1; 766 } 767 #endif 768 769 770 STATIC int 771 waitproc(block, status) 772 int *status; 773 { 774 #ifdef BSD 775 int flags; 776 777 #if JOBS 778 flags = WUNTRACED; 779 #else 780 flags = 0; 781 #endif 782 if (block == 0) 783 flags |= WNOHANG; 784 return wait3((union wait *)status, flags, (struct rusage *)NULL); 785 #else 786 #ifdef SYSV 787 int (*save)(); 788 789 if (block == 0) { 790 gotsigchild = 0; 791 save = signal(SIGCLD, onsigchild); 792 signal(SIGCLD, save); 793 if (gotsigchild == 0) 794 return 0; 795 } 796 return wait(status); 797 #else 798 if (block == 0) 799 return 0; 800 return wait(status); 801 #endif 802 #endif 803 } 804 805 806 807 /* 808 * Return a string identifying a command (to be printed by the 809 * jobs command. 810 */ 811 812 STATIC char *cmdnextc; 813 STATIC int cmdnleft; 814 STATIC void cmdtxt(), cmdputs(); 815 816 STATIC char * 817 commandtext(n) 818 union node *n; 819 { 820 char *name; 821 822 cmdnextc = name = ckmalloc(50); 823 cmdnleft = 50 - 4; 824 cmdtxt(n); 825 *cmdnextc = '\0'; 826 return name; 827 } 828 829 830 STATIC void 831 cmdtxt(n) 832 union node *n; 833 { 834 union node *np; 835 struct nodelist *lp; 836 char *p; 837 int i; 838 char s[2]; 839 840 switch (n->type) { 841 case NSEMI: 842 cmdtxt(n->nbinary.ch1); 843 cmdputs("; "); 844 cmdtxt(n->nbinary.ch2); 845 break; 846 case NAND: 847 cmdtxt(n->nbinary.ch1); 848 cmdputs(" && "); 849 cmdtxt(n->nbinary.ch2); 850 break; 851 case NOR: 852 cmdtxt(n->nbinary.ch1); 853 cmdputs(" || "); 854 cmdtxt(n->nbinary.ch2); 855 break; 856 case NPIPE: 857 for (lp = n->npipe.cmdlist ; lp ; lp = lp->next) { 858 cmdtxt(lp->n); 859 if (lp->next) 860 cmdputs(" | "); 861 } 862 break; 863 case NSUBSHELL: 864 cmdputs("("); 865 cmdtxt(n->nredir.n); 866 cmdputs(")"); 867 break; 868 case NREDIR: 869 case NBACKGND: 870 cmdtxt(n->nredir.n); 871 break; 872 case NIF: 873 cmdputs("if "); 874 cmdtxt(n->nif.test); 875 cmdputs("; then "); 876 cmdtxt(n->nif.ifpart); 877 cmdputs("..."); 878 break; 879 case NWHILE: 880 cmdputs("while "); 881 goto until; 882 case NUNTIL: 883 cmdputs("until "); 884 until: 885 cmdtxt(n->nbinary.ch1); 886 cmdputs("; do "); 887 cmdtxt(n->nbinary.ch2); 888 cmdputs("; done"); 889 break; 890 case NFOR: 891 cmdputs("for "); 892 cmdputs(n->nfor.var); 893 cmdputs(" in ..."); 894 break; 895 case NCASE: 896 cmdputs("case "); 897 cmdputs(n->ncase.expr->narg.text); 898 cmdputs(" in ..."); 899 break; 900 case NDEFUN: 901 cmdputs(n->narg.text); 902 cmdputs("() ..."); 903 break; 904 case NCMD: 905 for (np = n->ncmd.args ; np ; np = np->narg.next) { 906 cmdtxt(np); 907 if (np->narg.next) 908 cmdputs(" "); 909 } 910 for (np = n->ncmd.redirect ; np ; np = np->nfile.next) { 911 cmdputs(" "); 912 cmdtxt(np); 913 } 914 break; 915 case NARG: 916 cmdputs(n->narg.text); 917 break; 918 case NTO: 919 p = ">"; i = 1; goto redir; 920 case NAPPEND: 921 p = ">>"; i = 1; goto redir; 922 case NTOFD: 923 p = ">&"; i = 1; goto redir; 924 case NFROM: 925 p = "<"; i = 0; goto redir; 926 case NFROMFD: 927 p = "<&"; i = 0; goto redir; 928 redir: 929 if (n->nfile.fd != i) { 930 s[0] = n->nfile.fd + '0'; 931 s[1] = '\0'; 932 cmdputs(s); 933 } 934 cmdputs(p); 935 if (n->type == NTOFD || n->type == NFROMFD) { 936 s[0] = n->ndup.dupfd + '0'; 937 s[1] = '\0'; 938 cmdputs(s); 939 } else { 940 cmdtxt(n->nfile.fname); 941 } 942 break; 943 case NHERE: 944 case NXHERE: 945 cmdputs("<<..."); 946 break; 947 default: 948 cmdputs("???"); 949 break; 950 } 951 } 952 953 954 955 STATIC void 956 cmdputs(s) 957 char *s; 958 { 959 register char *p, *q; 960 register char c; 961 int subtype = 0; 962 963 if (cmdnleft <= 0) 964 return; 965 p = s; 966 q = cmdnextc; 967 while ((c = *p++) != '\0') { 968 if (c == CTLESC) 969 *q++ = *p++; 970 else if (c == CTLVAR) { 971 *q++ = '$'; 972 if (--cmdnleft > 0) 973 *q++ = '{'; 974 subtype = *p++; 975 } else if (c == '=' && subtype != 0) { 976 *q++ = "}-+?="[(subtype & VSTYPE) - VSNORMAL]; 977 subtype = 0; 978 } else if (c == CTLENDVAR) { 979 *q++ = '}'; 980 } else if (c == CTLBACKQ | c == CTLBACKQ+CTLQUOTE) 981 cmdnleft++; /* ignore it */ 982 else 983 *q++ = c; 984 if (--cmdnleft <= 0) { 985 *q++ = '.'; 986 *q++ = '.'; 987 *q++ = '.'; 988 break; 989 } 990 } 991 cmdnextc = q; 992 } 993