| 1 | /* |
| 2 | * Copyright (c) 1980 Regents of the University of California. |
| 3 | * All rights reserved. The Berkeley Software License Agreement |
| 4 | * specifies the terms and conditions for redistribution. |
| 5 | */ |
| 6 | |
| 7 | #ifndef lint |
| 8 | static char *sccsid = "@(#)proc.c 5.10 (Berkeley) %G%"; |
| 9 | #endif |
| 10 | |
| 11 | #include "sh.h" |
| 12 | #include "sh.dir.h" |
| 13 | #include "sh.proc.h" |
| 14 | #include <sys/wait.h> |
| 15 | #include <sys/ioctl.h> |
| 16 | |
| 17 | /* |
| 18 | * C Shell - functions that manage processes, handling hanging, termination |
| 19 | */ |
| 20 | |
| 21 | #define BIGINDEX 9 /* largest desirable job index */ |
| 22 | |
| 23 | /* |
| 24 | * pchild - called at interrupt level by the SIGCHLD signal |
| 25 | * indicating that at least one child has terminated or stopped |
| 26 | * thus at least one wait system call will definitely return a |
| 27 | * childs status. Top level routines (like pwait) must be sure |
| 28 | * to mask interrupts when playing with the proclist data structures! |
| 29 | */ |
| 30 | pchild() |
| 31 | { |
| 32 | register struct process *pp; |
| 33 | register struct process *fp; |
| 34 | register int pid; |
| 35 | union wait w; |
| 36 | int jobflags; |
| 37 | struct rusage ru; |
| 38 | extern int insource; |
| 39 | |
| 40 | loop: |
| 41 | pid = wait3(&w, (setintr && (intty || insource) ? WNOHANG|WUNTRACED:WNOHANG), &ru); |
| 42 | if (pid <= 0) { |
| 43 | if (errno == EINTR) { |
| 44 | errno = 0; |
| 45 | goto loop; |
| 46 | } |
| 47 | pnoprocesses = pid == -1; |
| 48 | return; |
| 49 | } |
| 50 | for (pp = proclist.p_next; pp != PNULL; pp = pp->p_next) |
| 51 | if (pid == pp->p_pid) |
| 52 | goto found; |
| 53 | goto loop; |
| 54 | found: |
| 55 | if (pid == atoi(value("child"))) |
| 56 | unsetv("child"); |
| 57 | pp->p_flags &= ~(PRUNNING|PSTOPPED|PREPORTED); |
| 58 | if (WIFSTOPPED(w)) { |
| 59 | pp->p_flags |= PSTOPPED; |
| 60 | pp->p_reason = w.w_stopsig; |
| 61 | } else { |
| 62 | if (pp->p_flags & (PTIME|PPTIME) || adrof("time")) |
| 63 | (void) gettimeofday(&pp->p_etime, (struct timezone *)0); |
| 64 | pp->p_rusage = ru; |
| 65 | if (WIFSIGNALED(w)) { |
| 66 | if (w.w_termsig == SIGINT) |
| 67 | pp->p_flags |= PINTERRUPTED; |
| 68 | else |
| 69 | pp->p_flags |= PSIGNALED; |
| 70 | if (w.w_coredump) |
| 71 | pp->p_flags |= PDUMPED; |
| 72 | pp->p_reason = w.w_termsig; |
| 73 | } else { |
| 74 | pp->p_reason = w.w_retcode; |
| 75 | if (pp->p_reason != 0) |
| 76 | pp->p_flags |= PAEXITED; |
| 77 | else |
| 78 | pp->p_flags |= PNEXITED; |
| 79 | } |
| 80 | } |
| 81 | jobflags = 0; |
| 82 | fp = pp; |
| 83 | do { |
| 84 | if ((fp->p_flags & (PPTIME|PRUNNING|PSTOPPED)) == 0 && |
| 85 | !child && adrof("time") && |
| 86 | fp->p_rusage.ru_utime.tv_sec+fp->p_rusage.ru_stime.tv_sec >= |
| 87 | atoi(value("time"))) |
| 88 | fp->p_flags |= PTIME; |
| 89 | jobflags |= fp->p_flags; |
| 90 | } while ((fp = fp->p_friends) != pp); |
| 91 | pp->p_flags &= ~PFOREGND; |
| 92 | if (pp == pp->p_friends && (pp->p_flags & PPTIME)) { |
| 93 | pp->p_flags &= ~PPTIME; |
| 94 | pp->p_flags |= PTIME; |
| 95 | } |
| 96 | if ((jobflags & (PRUNNING|PREPORTED)) == 0) { |
| 97 | fp = pp; |
| 98 | do { |
| 99 | if (fp->p_flags&PSTOPPED) |
| 100 | fp->p_flags |= PREPORTED; |
| 101 | } while((fp = fp->p_friends) != pp); |
| 102 | while(fp->p_pid != fp->p_jobid) |
| 103 | fp = fp->p_friends; |
| 104 | if (jobflags&PSTOPPED) { |
| 105 | if (pcurrent && pcurrent != fp) |
| 106 | pprevious = pcurrent; |
| 107 | pcurrent = fp; |
| 108 | } else |
| 109 | pclrcurr(fp); |
| 110 | if (jobflags&PFOREGND) { |
| 111 | if (jobflags & (PSIGNALED|PSTOPPED|PPTIME) || |
| 112 | #ifdef IIASA |
| 113 | jobflags & PAEXITED || |
| 114 | #endif |
| 115 | !eq(dcwd->di_name, fp->p_cwd->di_name)) { |
| 116 | ; /* print in pjwait */ |
| 117 | } |
| 118 | /* |
| 119 | else if ((jobflags & (PTIME|PSTOPPED)) == PTIME) |
| 120 | ptprint(fp); |
| 121 | */ |
| 122 | } else { |
| 123 | if (jobflags&PNOTIFY || adrof("notify")) { |
| 124 | printf("\215\n"); |
| 125 | (void) pprint(pp, NUMBER|NAME|REASON); |
| 126 | if ((jobflags&PSTOPPED) == 0) |
| 127 | pflush(pp); |
| 128 | } else { |
| 129 | fp->p_flags |= PNEEDNOTE; |
| 130 | neednote++; |
| 131 | } |
| 132 | } |
| 133 | } |
| 134 | goto loop; |
| 135 | } |
| 136 | |
| 137 | pnote() |
| 138 | { |
| 139 | register struct process *pp; |
| 140 | int flags; |
| 141 | long omask; |
| 142 | |
| 143 | neednote = 0; |
| 144 | for (pp = proclist.p_next; pp != PNULL; pp = pp->p_next) { |
| 145 | if (pp->p_flags & PNEEDNOTE) { |
| 146 | omask = sigblock(sigmask(SIGCHLD)); |
| 147 | pp->p_flags &= ~PNEEDNOTE; |
| 148 | flags = pprint(pp, NUMBER|NAME|REASON); |
| 149 | if ((flags&(PRUNNING|PSTOPPED)) == 0) |
| 150 | pflush(pp); |
| 151 | (void) sigsetmask(omask); |
| 152 | } |
| 153 | } |
| 154 | } |
| 155 | |
| 156 | /* |
| 157 | * pwait - wait for current job to terminate, maintaining integrity |
| 158 | * of current and previous job indicators. |
| 159 | */ |
| 160 | pwait() |
| 161 | { |
| 162 | register struct process *fp, *pp; |
| 163 | long omask; |
| 164 | |
| 165 | /* |
| 166 | * Here's where dead procs get flushed. |
| 167 | */ |
| 168 | omask = sigblock(sigmask(SIGCHLD)); |
| 169 | for (pp = (fp = &proclist)->p_next; pp != PNULL; pp = (fp = pp)->p_next) |
| 170 | if (pp->p_pid == 0) { |
| 171 | fp->p_next = pp->p_next; |
| 172 | xfree(pp->p_command); |
| 173 | if (pp->p_cwd && --pp->p_cwd->di_count == 0) |
| 174 | if (pp->p_cwd->di_next == 0) |
| 175 | dfree(pp->p_cwd); |
| 176 | xfree((char *)pp); |
| 177 | pp = fp; |
| 178 | } |
| 179 | (void) sigsetmask(omask); |
| 180 | pjwait(pcurrjob); |
| 181 | } |
| 182 | |
| 183 | /* |
| 184 | * pjwait - wait for a job to finish or become stopped |
| 185 | * It is assumed to be in the foreground state (PFOREGND) |
| 186 | */ |
| 187 | pjwait(pp) |
| 188 | register struct process *pp; |
| 189 | { |
| 190 | register struct process *fp; |
| 191 | int jobflags, reason; |
| 192 | long omask; |
| 193 | |
| 194 | while (pp->p_pid != pp->p_jobid) |
| 195 | pp = pp->p_friends; |
| 196 | fp = pp; |
| 197 | do { |
| 198 | if ((fp->p_flags&(PFOREGND|PRUNNING)) == PRUNNING) |
| 199 | printf("BUG: waiting for background job!\n"); |
| 200 | } while ((fp = fp->p_friends) != pp); |
| 201 | /* |
| 202 | * Now keep pausing as long as we are not interrupted (SIGINT), |
| 203 | * and the target process, or any of its friends, are running |
| 204 | */ |
| 205 | fp = pp; |
| 206 | omask = sigblock(sigmask(SIGCHLD)); |
| 207 | for (;;) { |
| 208 | jobflags = 0; |
| 209 | do |
| 210 | jobflags |= fp->p_flags; |
| 211 | while ((fp = (fp->p_friends)) != pp); |
| 212 | if ((jobflags & PRUNNING) == 0) |
| 213 | break; |
| 214 | sigpause(sigblock(0L) &~ sigmask(SIGCHLD)); |
| 215 | } |
| 216 | (void) sigsetmask(omask); |
| 217 | if (tpgrp > 0) /* get tty back */ |
| 218 | (void) ioctl(FSHTTY, TIOCSPGRP, (char *)&tpgrp); |
| 219 | if ((jobflags&(PSIGNALED|PSTOPPED|PTIME)) || |
| 220 | !eq(dcwd->di_name, fp->p_cwd->di_name)) { |
| 221 | if (jobflags&PSTOPPED) |
| 222 | printf("\n"); |
| 223 | (void) pprint(pp, AREASON|SHELLDIR); |
| 224 | } |
| 225 | if ((jobflags&(PINTERRUPTED|PSTOPPED)) && setintr && |
| 226 | (!gointr || !eq(gointr, "-"))) { |
| 227 | if ((jobflags & PSTOPPED) == 0) |
| 228 | pflush(pp); |
| 229 | pintr1(0); |
| 230 | /*NOTREACHED*/ |
| 231 | } |
| 232 | reason = 0; |
| 233 | fp = pp; |
| 234 | do { |
| 235 | if (fp->p_reason) |
| 236 | reason = fp->p_flags & (PSIGNALED|PINTERRUPTED) ? |
| 237 | fp->p_reason | QUOTE : fp->p_reason; |
| 238 | } while ((fp = fp->p_friends) != pp); |
| 239 | set("status", putn(reason)); |
| 240 | if (reason && exiterr) |
| 241 | exitstat(); |
| 242 | pflush(pp); |
| 243 | } |
| 244 | |
| 245 | /* |
| 246 | * dowait - wait for all processes to finish |
| 247 | */ |
| 248 | dowait() |
| 249 | { |
| 250 | register struct process *pp; |
| 251 | long omask; |
| 252 | |
| 253 | pjobs++; |
| 254 | omask = sigblock(sigmask(SIGCHLD)); |
| 255 | loop: |
| 256 | for (pp = proclist.p_next; pp; pp = pp->p_next) |
| 257 | if (pp->p_pid && /* pp->p_pid == pp->p_jobid && */ |
| 258 | pp->p_flags&PRUNNING) { |
| 259 | sigpause(0L); |
| 260 | goto loop; |
| 261 | } |
| 262 | (void) sigsetmask(omask); |
| 263 | pjobs = 0; |
| 264 | } |
| 265 | |
| 266 | /* |
| 267 | * pflushall - flush all jobs from list (e.g. at fork()) |
| 268 | */ |
| 269 | pflushall() |
| 270 | { |
| 271 | register struct process *pp; |
| 272 | |
| 273 | for (pp = proclist.p_next; pp != PNULL; pp = pp->p_next) |
| 274 | if (pp->p_pid) |
| 275 | pflush(pp); |
| 276 | } |
| 277 | |
| 278 | /* |
| 279 | * pflush - flag all process structures in the same job as the |
| 280 | * the argument process for deletion. The actual free of the |
| 281 | * space is not done here since pflush is called at interrupt level. |
| 282 | */ |
| 283 | pflush(pp) |
| 284 | register struct process *pp; |
| 285 | { |
| 286 | register struct process *np; |
| 287 | register int index; |
| 288 | |
| 289 | if (pp->p_pid == 0) { |
| 290 | printf("BUG: process flushed twice"); |
| 291 | return; |
| 292 | } |
| 293 | while (pp->p_pid != pp->p_jobid) |
| 294 | pp = pp->p_friends; |
| 295 | pclrcurr(pp); |
| 296 | if (pp == pcurrjob) |
| 297 | pcurrjob = 0; |
| 298 | index = pp->p_index; |
| 299 | np = pp; |
| 300 | do { |
| 301 | np->p_index = np->p_pid = 0; |
| 302 | np->p_flags &= ~PNEEDNOTE; |
| 303 | } while ((np = np->p_friends) != pp); |
| 304 | if (index == pmaxindex) { |
| 305 | for (np = proclist.p_next, index = 0; np; np = np->p_next) |
| 306 | if (np->p_index > index) |
| 307 | index = np->p_index; |
| 308 | pmaxindex = index; |
| 309 | } |
| 310 | } |
| 311 | |
| 312 | /* |
| 313 | * pclrcurr - make sure the given job is not the current or previous job; |
| 314 | * pp MUST be the job leader |
| 315 | */ |
| 316 | pclrcurr(pp) |
| 317 | register struct process *pp; |
| 318 | { |
| 319 | |
| 320 | if (pp == pcurrent) |
| 321 | if (pprevious != PNULL) { |
| 322 | pcurrent = pprevious; |
| 323 | pprevious = pgetcurr(pp); |
| 324 | } else { |
| 325 | pcurrent = pgetcurr(pp); |
| 326 | pprevious = pgetcurr(pp); |
| 327 | } |
| 328 | else if (pp == pprevious) |
| 329 | pprevious = pgetcurr(pp); |
| 330 | } |
| 331 | |
| 332 | /* +4 here is 1 for '\0', 1 ea for << >& >> */ |
| 333 | char command[PMAXLEN+4]; |
| 334 | int cmdlen; |
| 335 | char *cmdp; |
| 336 | /* |
| 337 | * palloc - allocate a process structure and fill it up. |
| 338 | * an important assumption is made that the process is running. |
| 339 | */ |
| 340 | palloc(pid, t) |
| 341 | int pid; |
| 342 | register struct command *t; |
| 343 | { |
| 344 | register struct process *pp; |
| 345 | int i; |
| 346 | |
| 347 | pp = (struct process *)calloc(1, sizeof(struct process)); |
| 348 | pp->p_pid = pid; |
| 349 | pp->p_flags = t->t_dflg & FAND ? PRUNNING : PRUNNING|PFOREGND; |
| 350 | if (t->t_dflg & FTIME) |
| 351 | pp->p_flags |= PPTIME; |
| 352 | cmdp = command; |
| 353 | cmdlen = 0; |
| 354 | padd(t); |
| 355 | *cmdp++ = 0; |
| 356 | if (t->t_dflg & FPOU) { |
| 357 | pp->p_flags |= PPOU; |
| 358 | if (t->t_dflg & FDIAG) |
| 359 | pp->p_flags |= PDIAG; |
| 360 | } |
| 361 | pp->p_command = savestr(command); |
| 362 | if (pcurrjob) { |
| 363 | struct process *fp; |
| 364 | /* careful here with interrupt level */ |
| 365 | pp->p_cwd = 0; |
| 366 | pp->p_index = pcurrjob->p_index; |
| 367 | pp->p_friends = pcurrjob; |
| 368 | pp->p_jobid = pcurrjob->p_pid; |
| 369 | for (fp = pcurrjob; fp->p_friends != pcurrjob; fp = fp->p_friends) |
| 370 | ; |
| 371 | fp->p_friends = pp; |
| 372 | } else { |
| 373 | pcurrjob = pp; |
| 374 | pp->p_jobid = pid; |
| 375 | pp->p_friends = pp; |
| 376 | pp->p_cwd = dcwd; |
| 377 | dcwd->di_count++; |
| 378 | if (pmaxindex < BIGINDEX) |
| 379 | pp->p_index = ++pmaxindex; |
| 380 | else { |
| 381 | struct process *np; |
| 382 | |
| 383 | for (i = 1; ; i++) { |
| 384 | for (np = proclist.p_next; np; np = np->p_next) |
| 385 | if (np->p_index == i) |
| 386 | goto tryagain; |
| 387 | pp->p_index = i; |
| 388 | if (i > pmaxindex) |
| 389 | pmaxindex = i; |
| 390 | break; |
| 391 | tryagain:; |
| 392 | } |
| 393 | } |
| 394 | if (pcurrent == PNULL) |
| 395 | pcurrent = pp; |
| 396 | else if (pprevious == PNULL) |
| 397 | pprevious = pp; |
| 398 | } |
| 399 | pp->p_next = proclist.p_next; |
| 400 | proclist.p_next = pp; |
| 401 | (void) gettimeofday(&pp->p_btime, (struct timezone *)0); |
| 402 | } |
| 403 | |
| 404 | padd(t) |
| 405 | register struct command *t; |
| 406 | { |
| 407 | char **argp; |
| 408 | |
| 409 | if (t == 0) |
| 410 | return; |
| 411 | switch (t->t_dtyp) { |
| 412 | |
| 413 | case TPAR: |
| 414 | pads("( "); |
| 415 | padd(t->t_dspr); |
| 416 | pads(" )"); |
| 417 | break; |
| 418 | |
| 419 | case TCOM: |
| 420 | for (argp = t->t_dcom; *argp; argp++) { |
| 421 | pads(*argp); |
| 422 | if (argp[1]) |
| 423 | pads(" "); |
| 424 | } |
| 425 | break; |
| 426 | |
| 427 | case TOR: |
| 428 | case TAND: |
| 429 | case TFIL: |
| 430 | case TLST: |
| 431 | padd(t->t_dcar); |
| 432 | switch (t->t_dtyp) { |
| 433 | case TOR: |
| 434 | pads(" || "); |
| 435 | break; |
| 436 | case TAND: |
| 437 | pads(" && "); |
| 438 | break; |
| 439 | case TFIL: |
| 440 | pads(" | "); |
| 441 | break; |
| 442 | case TLST: |
| 443 | pads("; "); |
| 444 | break; |
| 445 | } |
| 446 | padd(t->t_dcdr); |
| 447 | return; |
| 448 | } |
| 449 | if ((t->t_dflg & FPIN) == 0 && t->t_dlef) { |
| 450 | pads((t->t_dflg & FHERE) ? " << " : " < "); |
| 451 | pads(t->t_dlef); |
| 452 | } |
| 453 | if ((t->t_dflg & FPOU) == 0 && t->t_drit) { |
| 454 | pads((t->t_dflg & FCAT) ? " >>" : " >"); |
| 455 | if (t->t_dflg & FDIAG) |
| 456 | pads("&"); |
| 457 | pads(" "); |
| 458 | pads(t->t_drit); |
| 459 | } |
| 460 | } |
| 461 | |
| 462 | pads(cp) |
| 463 | char *cp; |
| 464 | { |
| 465 | register int i = strlen(cp); |
| 466 | |
| 467 | if (cmdlen >= PMAXLEN) |
| 468 | return; |
| 469 | if (cmdlen + i >= PMAXLEN) { |
| 470 | (void) strcpy(cmdp, " ..."); |
| 471 | cmdlen = PMAXLEN; |
| 472 | cmdp += 4; |
| 473 | return; |
| 474 | } |
| 475 | (void) strcpy(cmdp, cp); |
| 476 | cmdp += i; |
| 477 | cmdlen += i; |
| 478 | } |
| 479 | |
| 480 | /* |
| 481 | * psavejob - temporarily save the current job on a one level stack |
| 482 | * so another job can be created. Used for { } in exp6 |
| 483 | * and `` in globbing. |
| 484 | */ |
| 485 | psavejob() |
| 486 | { |
| 487 | |
| 488 | pholdjob = pcurrjob; |
| 489 | pcurrjob = PNULL; |
| 490 | } |
| 491 | |
| 492 | /* |
| 493 | * prestjob - opposite of psavejob. This may be missed if we are interrupted |
| 494 | * somewhere, but pendjob cleans up anyway. |
| 495 | */ |
| 496 | prestjob() |
| 497 | { |
| 498 | |
| 499 | pcurrjob = pholdjob; |
| 500 | pholdjob = PNULL; |
| 501 | } |
| 502 | |
| 503 | /* |
| 504 | * pendjob - indicate that a job (set of commands) has been completed |
| 505 | * or is about to begin. |
| 506 | */ |
| 507 | pendjob() |
| 508 | { |
| 509 | register struct process *pp, *tp; |
| 510 | |
| 511 | if (pcurrjob && (pcurrjob->p_flags&(PFOREGND|PSTOPPED)) == 0) { |
| 512 | pp = pcurrjob; |
| 513 | while (pp->p_pid != pp->p_jobid) |
| 514 | pp = pp->p_friends; |
| 515 | printf("[%d]", pp->p_index); |
| 516 | tp = pp; |
| 517 | do { |
| 518 | printf(" %d", pp->p_pid); |
| 519 | pp = pp->p_friends; |
| 520 | } while (pp != tp); |
| 521 | printf("\n"); |
| 522 | } |
| 523 | pholdjob = pcurrjob = 0; |
| 524 | } |
| 525 | |
| 526 | /* |
| 527 | * pprint - print a job |
| 528 | */ |
| 529 | pprint(pp, flag) |
| 530 | register struct process *pp; |
| 531 | { |
| 532 | register status, reason; |
| 533 | struct process *tp; |
| 534 | extern char *linp, linbuf[]; |
| 535 | int jobflags, pstatus; |
| 536 | char *format; |
| 537 | |
| 538 | while (pp->p_pid != pp->p_jobid) |
| 539 | pp = pp->p_friends; |
| 540 | if (pp == pp->p_friends && (pp->p_flags & PPTIME)) { |
| 541 | pp->p_flags &= ~PPTIME; |
| 542 | pp->p_flags |= PTIME; |
| 543 | } |
| 544 | tp = pp; |
| 545 | status = reason = -1; |
| 546 | jobflags = 0; |
| 547 | do { |
| 548 | jobflags |= pp->p_flags; |
| 549 | pstatus = pp->p_flags & PALLSTATES; |
| 550 | if (tp != pp && linp != linbuf && !(flag&FANCY) && |
| 551 | (pstatus == status && pp->p_reason == reason || |
| 552 | !(flag&REASON))) |
| 553 | printf(" "); |
| 554 | else { |
| 555 | if (tp != pp && linp != linbuf) |
| 556 | printf("\n"); |
| 557 | if(flag&NUMBER) |
| 558 | if (pp == tp) |
| 559 | printf("[%d]%s %c ", pp->p_index, |
| 560 | pp->p_index < 10 ? " " : "", |
| 561 | pp==pcurrent ? '+' : |
| 562 | (pp == pprevious ? '-' : ' ')); |
| 563 | else |
| 564 | printf(" "); |
| 565 | if (flag&FANCY) |
| 566 | printf("%5d ", pp->p_pid); |
| 567 | if (flag&(REASON|AREASON)) { |
| 568 | if (flag&NAME) |
| 569 | format = "%-23s"; |
| 570 | else |
| 571 | format = "%s"; |
| 572 | if (pstatus == status) |
| 573 | if (pp->p_reason == reason) { |
| 574 | printf(format, ""); |
| 575 | goto prcomd; |
| 576 | } else |
| 577 | reason = pp->p_reason; |
| 578 | else { |
| 579 | status = pstatus; |
| 580 | reason = pp->p_reason; |
| 581 | } |
| 582 | switch (status) { |
| 583 | |
| 584 | case PRUNNING: |
| 585 | printf(format, "Running "); |
| 586 | break; |
| 587 | |
| 588 | case PINTERRUPTED: |
| 589 | case PSTOPPED: |
| 590 | case PSIGNALED: |
| 591 | if ((flag&(REASON|AREASON)) |
| 592 | && reason != SIGINT |
| 593 | && reason != SIGPIPE) |
| 594 | printf(format, mesg[pp->p_reason].pname); |
| 595 | break; |
| 596 | |
| 597 | case PNEXITED: |
| 598 | case PAEXITED: |
| 599 | if (flag & REASON) |
| 600 | if (pp->p_reason) |
| 601 | printf("Exit %-16d", pp->p_reason); |
| 602 | else |
| 603 | printf(format, "Done"); |
| 604 | break; |
| 605 | |
| 606 | default: |
| 607 | printf("BUG: status=%-9o", status); |
| 608 | } |
| 609 | } |
| 610 | } |
| 611 | prcomd: |
| 612 | if (flag&NAME) { |
| 613 | printf("%s", pp->p_command); |
| 614 | if (pp->p_flags & PPOU) |
| 615 | printf(" |"); |
| 616 | if (pp->p_flags & PDIAG) |
| 617 | printf("&"); |
| 618 | } |
| 619 | if (flag&(REASON|AREASON) && pp->p_flags&PDUMPED) |
| 620 | printf(" (core dumped)"); |
| 621 | if (tp == pp->p_friends) { |
| 622 | if (flag&ERSAND) |
| 623 | printf(" &"); |
| 624 | if (flag&JOBDIR && |
| 625 | !eq(tp->p_cwd->di_name, dcwd->di_name)) { |
| 626 | printf(" (wd: "); |
| 627 | dtildepr(value("home"), tp->p_cwd->di_name); |
| 628 | printf(")"); |
| 629 | } |
| 630 | } |
| 631 | if (pp->p_flags&PPTIME && !(status&(PSTOPPED|PRUNNING))) { |
| 632 | if (linp != linbuf) |
| 633 | printf("\n\t"); |
| 634 | { static struct rusage zru; |
| 635 | prusage(&zru, &pp->p_rusage, &pp->p_etime, |
| 636 | &pp->p_btime); |
| 637 | } |
| 638 | } |
| 639 | if (tp == pp->p_friends) { |
| 640 | if (linp != linbuf) |
| 641 | printf("\n"); |
| 642 | if (flag&SHELLDIR && !eq(tp->p_cwd->di_name, dcwd->di_name)) { |
| 643 | printf("(wd now: "); |
| 644 | dtildepr(value("home"), dcwd->di_name); |
| 645 | printf(")\n"); |
| 646 | } |
| 647 | } |
| 648 | } while ((pp = pp->p_friends) != tp); |
| 649 | if (jobflags&PTIME && (jobflags&(PSTOPPED|PRUNNING)) == 0) { |
| 650 | if (jobflags & NUMBER) |
| 651 | printf(" "); |
| 652 | ptprint(tp); |
| 653 | } |
| 654 | return (jobflags); |
| 655 | } |
| 656 | |
| 657 | ptprint(tp) |
| 658 | register struct process *tp; |
| 659 | { |
| 660 | struct timeval tetime, diff; |
| 661 | static struct timeval ztime; |
| 662 | struct rusage ru; |
| 663 | static struct rusage zru; |
| 664 | register struct process *pp = tp; |
| 665 | |
| 666 | ru = zru; |
| 667 | tetime = ztime; |
| 668 | do { |
| 669 | ruadd(&ru, &pp->p_rusage); |
| 670 | tvsub(&diff, &pp->p_etime, &pp->p_btime); |
| 671 | if (timercmp(&diff, &tetime, >)) |
| 672 | tetime = diff; |
| 673 | } while ((pp = pp->p_friends) != tp); |
| 674 | prusage(&zru, &ru, &tetime, &ztime); |
| 675 | } |
| 676 | |
| 677 | /* |
| 678 | * dojobs - print all jobs |
| 679 | */ |
| 680 | dojobs(v) |
| 681 | char **v; |
| 682 | { |
| 683 | register struct process *pp; |
| 684 | register int flag = NUMBER|NAME|REASON; |
| 685 | int i; |
| 686 | |
| 687 | if (chkstop) |
| 688 | chkstop = 2; |
| 689 | if (*++v) { |
| 690 | if (v[1] || !eq(*v, "-l")) |
| 691 | error("Usage: jobs [ -l ]"); |
| 692 | flag |= FANCY|JOBDIR; |
| 693 | } |
| 694 | for (i = 1; i <= pmaxindex; i++) |
| 695 | for (pp = proclist.p_next; pp; pp = pp->p_next) |
| 696 | if (pp->p_index == i && pp->p_pid == pp->p_jobid) { |
| 697 | pp->p_flags &= ~PNEEDNOTE; |
| 698 | if (!(pprint(pp, flag) & (PRUNNING|PSTOPPED))) |
| 699 | pflush(pp); |
| 700 | break; |
| 701 | } |
| 702 | } |
| 703 | |
| 704 | /* |
| 705 | * dofg - builtin - put the job into the foreground |
| 706 | */ |
| 707 | dofg(v) |
| 708 | char **v; |
| 709 | { |
| 710 | register struct process *pp; |
| 711 | |
| 712 | okpcntl(); |
| 713 | ++v; |
| 714 | do { |
| 715 | pp = pfind(*v); |
| 716 | pstart(pp, 1); |
| 717 | pjwait(pp); |
| 718 | } while (*v && *++v); |
| 719 | } |
| 720 | |
| 721 | /* |
| 722 | * %... - builtin - put the job into the foreground |
| 723 | */ |
| 724 | dofg1(v) |
| 725 | char **v; |
| 726 | { |
| 727 | register struct process *pp; |
| 728 | |
| 729 | okpcntl(); |
| 730 | pp = pfind(v[0]); |
| 731 | pstart(pp, 1); |
| 732 | pjwait(pp); |
| 733 | } |
| 734 | |
| 735 | /* |
| 736 | * dobg - builtin - put the job into the background |
| 737 | */ |
| 738 | dobg(v) |
| 739 | char **v; |
| 740 | { |
| 741 | register struct process *pp; |
| 742 | |
| 743 | okpcntl(); |
| 744 | ++v; |
| 745 | do { |
| 746 | pp = pfind(*v); |
| 747 | pstart(pp, 0); |
| 748 | } while (*v && *++v); |
| 749 | } |
| 750 | |
| 751 | /* |
| 752 | * %... & - builtin - put the job into the background |
| 753 | */ |
| 754 | dobg1(v) |
| 755 | char **v; |
| 756 | { |
| 757 | register struct process *pp; |
| 758 | |
| 759 | pp = pfind(v[0]); |
| 760 | pstart(pp, 0); |
| 761 | } |
| 762 | |
| 763 | /* |
| 764 | * dostop - builtin - stop the job |
| 765 | */ |
| 766 | dostop(v) |
| 767 | char **v; |
| 768 | { |
| 769 | |
| 770 | pkill(++v, SIGSTOP); |
| 771 | } |
| 772 | |
| 773 | /* |
| 774 | * dokill - builtin - superset of kill (1) |
| 775 | */ |
| 776 | dokill(v) |
| 777 | char **v; |
| 778 | { |
| 779 | register int signum; |
| 780 | register char *name; |
| 781 | |
| 782 | v++; |
| 783 | if (v[0] && v[0][0] == '-') { |
| 784 | if (v[0][1] == 'l') { |
| 785 | for (signum = 1; signum <= NSIG; signum++) { |
| 786 | if (name = mesg[signum].iname) |
| 787 | printf("%s ", name); |
| 788 | if (signum == 16) |
| 789 | cshputchar('\n'); |
| 790 | } |
| 791 | cshputchar('\n'); |
| 792 | return; |
| 793 | } |
| 794 | if (digit(v[0][1])) { |
| 795 | signum = atoi(v[0]+1); |
| 796 | if (signum < 0 || signum > NSIG) |
| 797 | bferr("Bad signal number"); |
| 798 | } else { |
| 799 | name = &v[0][1]; |
| 800 | for (signum = 1; signum <= NSIG; signum++) |
| 801 | if (mesg[signum].iname && |
| 802 | eq(name, mesg[signum].iname)) |
| 803 | goto gotsig; |
| 804 | setname(name); |
| 805 | bferr("Unknown signal; kill -l lists signals"); |
| 806 | } |
| 807 | gotsig: |
| 808 | v++; |
| 809 | } else |
| 810 | signum = SIGTERM; |
| 811 | pkill(v, signum); |
| 812 | } |
| 813 | |
| 814 | pkill(v, signum) |
| 815 | char **v; |
| 816 | int signum; |
| 817 | { |
| 818 | register struct process *pp, *np; |
| 819 | register int jobflags = 0; |
| 820 | int pid, err = 0; |
| 821 | long omask; |
| 822 | char *cp; |
| 823 | extern char *sys_errlist[]; |
| 824 | |
| 825 | omask = sigmask(SIGCHLD); |
| 826 | if (setintr) |
| 827 | omask |= sigmask(SIGINT); |
| 828 | omask = sigblock(omask) & ~omask; |
| 829 | while (*v) { |
| 830 | cp = globone(*v); |
| 831 | if (*cp == '%') { |
| 832 | np = pp = pfind(cp); |
| 833 | do |
| 834 | jobflags |= np->p_flags; |
| 835 | while ((np = np->p_friends) != pp); |
| 836 | switch (signum) { |
| 837 | |
| 838 | case SIGSTOP: |
| 839 | case SIGTSTP: |
| 840 | case SIGTTIN: |
| 841 | case SIGTTOU: |
| 842 | if ((jobflags & PRUNNING) == 0) { |
| 843 | printf("%s: Already suspended\n", cp); |
| 844 | err++; |
| 845 | goto cont; |
| 846 | } |
| 847 | } |
| 848 | if (killpg(pp->p_jobid, signum) < 0) { |
| 849 | printf("%s: ", cp); |
| 850 | printf("%s\n", sys_errlist[errno]); |
| 851 | err++; |
| 852 | } |
| 853 | if (signum == SIGTERM || signum == SIGHUP) |
| 854 | (void) killpg(pp->p_jobid, SIGCONT); |
| 855 | } else if (!(digit(*cp) || *cp == '-')) |
| 856 | bferr("Arguments should be jobs or process id's"); |
| 857 | else { |
| 858 | pid = atoi(cp); |
| 859 | if (kill(pid, signum) < 0) { |
| 860 | printf("%d: ", pid); |
| 861 | printf("%s\n", sys_errlist[errno]); |
| 862 | err++; |
| 863 | goto cont; |
| 864 | } |
| 865 | if (signum == SIGTERM || signum == SIGHUP) |
| 866 | (void) kill(pid, SIGCONT); |
| 867 | } |
| 868 | cont: |
| 869 | xfree(cp); |
| 870 | v++; |
| 871 | } |
| 872 | (void) sigsetmask(omask); |
| 873 | if (err) |
| 874 | error(NOSTR); |
| 875 | } |
| 876 | |
| 877 | /* |
| 878 | * pstart - start the job in foreground/background |
| 879 | */ |
| 880 | pstart(pp, foregnd) |
| 881 | register struct process *pp; |
| 882 | int foregnd; |
| 883 | { |
| 884 | register struct process *np; |
| 885 | int jobflags = 0; |
| 886 | long omask; |
| 887 | |
| 888 | omask = sigblock(sigmask(SIGCHLD)); |
| 889 | np = pp; |
| 890 | do { |
| 891 | jobflags |= np->p_flags; |
| 892 | if (np->p_flags&(PRUNNING|PSTOPPED)) { |
| 893 | np->p_flags |= PRUNNING; |
| 894 | np->p_flags &= ~PSTOPPED; |
| 895 | if (foregnd) |
| 896 | np->p_flags |= PFOREGND; |
| 897 | else |
| 898 | np->p_flags &= ~PFOREGND; |
| 899 | } |
| 900 | } while((np = np->p_friends) != pp); |
| 901 | if (!foregnd) |
| 902 | pclrcurr(pp); |
| 903 | (void) pprint(pp, foregnd ? NAME|JOBDIR : NUMBER|NAME|AMPERSAND); |
| 904 | if (foregnd) |
| 905 | (void) ioctl(FSHTTY, TIOCSPGRP, (char *)&pp->p_jobid); |
| 906 | if (jobflags&PSTOPPED) |
| 907 | (void) killpg(pp->p_jobid, SIGCONT); |
| 908 | (void) sigsetmask(omask); |
| 909 | } |
| 910 | |
| 911 | panystop(neednl) |
| 912 | { |
| 913 | register struct process *pp; |
| 914 | |
| 915 | chkstop = 2; |
| 916 | for (pp = proclist.p_next; pp; pp = pp->p_next) |
| 917 | if (pp->p_flags & PSTOPPED) |
| 918 | error("\nThere are suspended jobs" + 1 - neednl); |
| 919 | } |
| 920 | |
| 921 | struct process * |
| 922 | pfind(cp) |
| 923 | char *cp; |
| 924 | { |
| 925 | register struct process *pp, *np; |
| 926 | |
| 927 | if (cp == 0 || cp[1] == 0 || eq(cp, "%%") || eq(cp, "%+")) { |
| 928 | if (pcurrent == PNULL) |
| 929 | bferr("No current job"); |
| 930 | return (pcurrent); |
| 931 | } |
| 932 | if (eq(cp, "%-") || eq(cp, "%#")) { |
| 933 | if (pprevious == PNULL) |
| 934 | bferr("No previous job"); |
| 935 | return (pprevious); |
| 936 | } |
| 937 | if (digit(cp[1])) { |
| 938 | int index = atoi(cp+1); |
| 939 | for (pp = proclist.p_next; pp; pp = pp->p_next) |
| 940 | if (pp->p_index == index && pp->p_pid == pp->p_jobid) |
| 941 | return (pp); |
| 942 | bferr("No such job"); |
| 943 | } |
| 944 | np = PNULL; |
| 945 | for (pp = proclist.p_next; pp; pp = pp->p_next) |
| 946 | if (pp->p_pid == pp->p_jobid) { |
| 947 | if (cp[1] == '?') { |
| 948 | register char *dp; |
| 949 | for (dp = pp->p_command; *dp; dp++) { |
| 950 | if (*dp != cp[2]) |
| 951 | continue; |
| 952 | if (prefix(cp+2, dp)) |
| 953 | goto match; |
| 954 | } |
| 955 | } else if (prefix(cp+1, pp->p_command)) { |
| 956 | match: |
| 957 | if (np) |
| 958 | bferr("Ambiguous"); |
| 959 | np = pp; |
| 960 | } |
| 961 | } |
| 962 | if (np) |
| 963 | return (np); |
| 964 | if (cp[1] == '?') |
| 965 | bferr("No job matches pattern"); |
| 966 | else |
| 967 | bferr("No such job"); |
| 968 | /*NOTREACHED*/ |
| 969 | } |
| 970 | |
| 971 | /* |
| 972 | * pgetcurr - find most recent job that is not pp, preferably stopped |
| 973 | */ |
| 974 | struct process * |
| 975 | pgetcurr(pp) |
| 976 | register struct process *pp; |
| 977 | { |
| 978 | register struct process *np; |
| 979 | register struct process *xp = PNULL; |
| 980 | |
| 981 | for (np = proclist.p_next; np; np = np->p_next) |
| 982 | if (np != pcurrent && np != pp && np->p_pid && |
| 983 | np->p_pid == np->p_jobid) { |
| 984 | if (np->p_flags & PSTOPPED) |
| 985 | return (np); |
| 986 | if (xp == PNULL) |
| 987 | xp = np; |
| 988 | } |
| 989 | return (xp); |
| 990 | } |
| 991 | |
| 992 | /* |
| 993 | * donotify - flag the job so as to report termination asynchronously |
| 994 | */ |
| 995 | donotify(v) |
| 996 | char **v; |
| 997 | { |
| 998 | register struct process *pp; |
| 999 | |
| 1000 | pp = pfind(*++v); |
| 1001 | pp->p_flags |= PNOTIFY; |
| 1002 | } |
| 1003 | |
| 1004 | /* |
| 1005 | * Do the fork and whatever should be done in the child side that |
| 1006 | * should not be done if we are not forking at all (like for simple builtin's) |
| 1007 | * Also do everything that needs any signals fiddled with in the parent side |
| 1008 | * |
| 1009 | * Wanttty tells whether process and/or tty pgrps are to be manipulated: |
| 1010 | * -1: leave tty alone; inherit pgrp from parent |
| 1011 | * 0: already have tty; manipulate process pgrps only |
| 1012 | * 1: want to claim tty; manipulate process and tty pgrps |
| 1013 | * It is usually just the value of tpgrp. |
| 1014 | */ |
| 1015 | pfork(t, wanttty) |
| 1016 | struct command *t; /* command we are forking for */ |
| 1017 | int wanttty; |
| 1018 | { |
| 1019 | register int pid; |
| 1020 | bool ignint = 0; |
| 1021 | int pgrp; |
| 1022 | long omask; |
| 1023 | |
| 1024 | /* |
| 1025 | * A child will be uninterruptible only under very special |
| 1026 | * conditions. Remember that the semantics of '&' is |
| 1027 | * implemented by disconnecting the process from the tty so |
| 1028 | * signals do not need to ignored just for '&'. |
| 1029 | * Thus signals are set to default action for children unless: |
| 1030 | * we have had an "onintr -" (then specifically ignored) |
| 1031 | * we are not playing with signals (inherit action) |
| 1032 | */ |
| 1033 | if (setintr) |
| 1034 | ignint = (tpgrp == -1 && (t->t_dflg&FINT)) |
| 1035 | || (gointr && eq(gointr, "-")); |
| 1036 | /* |
| 1037 | * Hold SIGCHLD until we have the process installed in our table. |
| 1038 | */ |
| 1039 | omask = sigblock(sigmask(SIGCHLD)); |
| 1040 | while ((pid = fork()) < 0) |
| 1041 | if (setintr == 0) |
| 1042 | sleep(FORKSLEEP); |
| 1043 | else { |
| 1044 | (void) sigsetmask(omask); |
| 1045 | error("No more processes"); |
| 1046 | } |
| 1047 | if (pid == 0) { |
| 1048 | settimes(); |
| 1049 | pgrp = pcurrjob ? pcurrjob->p_jobid : getpid(); |
| 1050 | pflushall(); |
| 1051 | pcurrjob = PNULL; |
| 1052 | child++; |
| 1053 | if (setintr) { |
| 1054 | setintr = 0; /* until I think otherwise */ |
| 1055 | /* |
| 1056 | * Children just get blown away on SIGINT, SIGQUIT |
| 1057 | * unless "onintr -" seen. |
| 1058 | */ |
| 1059 | (void) signal(SIGINT, ignint ? SIG_IGN : SIG_DFL); |
| 1060 | (void) signal(SIGQUIT, ignint ? SIG_IGN : SIG_DFL); |
| 1061 | if (wanttty >= 0) { |
| 1062 | /* make stoppable */ |
| 1063 | (void) signal(SIGTSTP, SIG_DFL); |
| 1064 | (void) signal(SIGTTIN, SIG_DFL); |
| 1065 | (void) signal(SIGTTOU, SIG_DFL); |
| 1066 | } |
| 1067 | (void) signal(SIGTERM, parterm); |
| 1068 | } else if (tpgrp == -1 && (t->t_dflg&FINT)) { |
| 1069 | (void) signal(SIGINT, SIG_IGN); |
| 1070 | (void) signal(SIGQUIT, SIG_IGN); |
| 1071 | } |
| 1072 | if (wanttty > 0) |
| 1073 | (void) ioctl(FSHTTY, TIOCSPGRP, (char *)&pgrp); |
| 1074 | if (wanttty >= 0 && tpgrp >= 0) |
| 1075 | (void) setpgrp(0, pgrp); |
| 1076 | if (tpgrp > 0) |
| 1077 | tpgrp = 0; /* gave tty away */ |
| 1078 | /* |
| 1079 | * Nohup and nice apply only to TCOM's but it would be |
| 1080 | * nice (?!?) if you could say "nohup (foo;bar)" |
| 1081 | * Then the parser would have to know about nice/nohup/time |
| 1082 | */ |
| 1083 | if (t->t_dflg & FNOHUP) |
| 1084 | (void) signal(SIGHUP, SIG_IGN); |
| 1085 | if (t->t_dflg & FNICE) |
| 1086 | (void) setpriority(PRIO_PROCESS, 0, t->t_nice); |
| 1087 | } else { |
| 1088 | palloc(pid, t); |
| 1089 | (void) sigsetmask(omask); |
| 1090 | } |
| 1091 | |
| 1092 | return (pid); |
| 1093 | } |
| 1094 | |
| 1095 | okpcntl() |
| 1096 | { |
| 1097 | |
| 1098 | if (tpgrp == -1) |
| 1099 | error("No job control in this shell"); |
| 1100 | if (tpgrp == 0) |
| 1101 | error("No job control in subshells"); |
| 1102 | } |