1 /* $NetBSD: job.c,v 1.133 2007/10/14 20:22:53 apb Exp $ */ 2 3 /* 4 * Copyright (c) 1988, 1989, 1990 The Regents of the University of California. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to Berkeley by 8 * Adam de Boor. 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 /* 36 * Copyright (c) 1988, 1989 by Adam de Boor 37 * Copyright (c) 1989 by Berkeley Softworks 38 * All rights reserved. 39 * 40 * This code is derived from software contributed to Berkeley by 41 * Adam de Boor. 42 * 43 * Redistribution and use in source and binary forms, with or without 44 * modification, are permitted provided that the following conditions 45 * are met: 46 * 1. Redistributions of source code must retain the above copyright 47 * notice, this list of conditions and the following disclaimer. 48 * 2. Redistributions in binary form must reproduce the above copyright 49 * notice, this list of conditions and the following disclaimer in the 50 * documentation and/or other materials provided with the distribution. 51 * 3. All advertising materials mentioning features or use of this software 52 * must display the following acknowledgement: 53 * This product includes software developed by the University of 54 * California, Berkeley and its contributors. 55 * 4. Neither the name of the University nor the names of its contributors 56 * may be used to endorse or promote products derived from this software 57 * without specific prior written permission. 58 * 59 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 60 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 61 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 62 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 63 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 64 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 65 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 66 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 67 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 68 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 69 * SUCH DAMAGE. 70 */ 71 72 #ifndef MAKE_NATIVE 73 static char rcsid[] = "$NetBSD: job.c,v 1.133 2007/10/14 20:22:53 apb Exp $"; 74 #else 75 #include <sys/cdefs.h> 76 #ifndef lint 77 #if 0 78 static char sccsid[] = "@(#)job.c 8.2 (Berkeley) 3/19/94"; 79 #else 80 __RCSID("$NetBSD: job.c,v 1.133 2007/10/14 20:22:53 apb Exp $"); 81 #endif 82 #endif /* not lint */ 83 #endif 84 85 /*- 86 * job.c -- 87 * handle the creation etc. of our child processes. 88 * 89 * Interface: 90 * Job_Make Start the creation of the given target. 91 * 92 * Job_CatchChildren Check for and handle the termination of any 93 * children. This must be called reasonably 94 * frequently to keep the whole make going at 95 * a decent clip, since job table entries aren't 96 * removed until their process is caught this way. 97 * 98 * Job_CatchOutput Print any output our children have produced. 99 * Should also be called fairly frequently to 100 * keep the user informed of what's going on. 101 * If no output is waiting, it will block for 102 * a time given by the SEL_* constants, below, 103 * or until output is ready. 104 * 105 * Job_Init Called to intialize this module. in addition, 106 * any commands attached to the .BEGIN target 107 * are executed before this function returns. 108 * Hence, the makefile must have been parsed 109 * before this function is called. 110 * 111 * Job_End Cleanup any memory used. 112 * 113 * Job_ParseShell Given the line following a .SHELL target, parse 114 * the line as a shell specification. Returns 115 * FAILURE if the spec was incorrect. 116 * 117 * Job_Finish Perform any final processing which needs doing. 118 * This includes the execution of any commands 119 * which have been/were attached to the .END 120 * target. It should only be called when the 121 * job table is empty. 122 * 123 * Job_AbortAll Abort all currently running jobs. It doesn't 124 * handle output or do anything for the jobs, 125 * just kills them. It should only be called in 126 * an emergency, as it were. 127 * 128 * Job_CheckCommands Verify that the commands for a target are 129 * ok. Provide them if necessary and possible. 130 * 131 * Job_Touch Update a target without really updating it. 132 * 133 * Job_Wait Wait for all currently-running jobs to finish. 134 */ 135 136 #include <sys/types.h> 137 #include <sys/stat.h> 138 #include <sys/file.h> 139 #include <sys/time.h> 140 #include <sys/wait.h> 141 142 #include <errno.h> 143 #include <fcntl.h> 144 #ifndef USE_SELECT 145 #include <poll.h> 146 #endif 147 #include <signal.h> 148 #include <stdio.h> 149 #include <string.h> 150 #include <utime.h> 151 152 #include "make.h" 153 #include "hash.h" 154 #include "dir.h" 155 #include "job.h" 156 #include "pathnames.h" 157 #include "trace.h" 158 # define STATIC static 159 160 /* 161 * error handling variables 162 */ 163 static int errors = 0; /* number of errors reported */ 164 static int aborting = 0; /* why is the make aborting? */ 165 #define ABORT_ERROR 1 /* Because of an error */ 166 #define ABORT_INTERRUPT 2 /* Because it was interrupted */ 167 #define ABORT_WAIT 3 /* Waiting for jobs to finish */ 168 #define JOB_TOKENS "+EI+" /* Token to requeue for each abort state */ 169 170 /* 171 * this tracks the number of tokens currently "out" to build jobs. 172 */ 173 int jobTokensRunning = 0; 174 int not_parallel = 0; /* set if .NOT_PARALLEL */ 175 176 /* 177 * XXX: Avoid SunOS bug... FILENO() is fp->_file, and file 178 * is a char! So when we go above 127 we turn negative! 179 */ 180 #define FILENO(a) ((unsigned) fileno(a)) 181 182 /* 183 * post-make command processing. The node postCommands is really just the 184 * .END target but we keep it around to avoid having to search for it 185 * all the time. 186 */ 187 static GNode *postCommands = NILGNODE; 188 /* node containing commands to execute when 189 * everything else is done */ 190 static int numCommands; /* The number of commands actually printed 191 * for a target. Should this number be 192 * 0, no shell will be executed. */ 193 194 /* 195 * Return values from JobStart. 196 */ 197 #define JOB_RUNNING 0 /* Job is running */ 198 #define JOB_ERROR 1 /* Error in starting the job */ 199 #define JOB_FINISHED 2 /* The job is already finished */ 200 201 /* 202 * Descriptions for various shells. 203 * 204 * The build environment may set DEFSHELL_INDEX to one of 205 * DEFSHELL_INDEX_SH, DEFSHELL_INDEX_KSH, or DEFSHELL_INDEX_CSH, to 206 * select one of the prefedined shells as the default shell. 207 * 208 * Alternatively, the build environment may set DEFSHELL_CUSTOM to the 209 * name or the full path of a sh-compatible shell, which will be used as 210 * the default shell. 211 * 212 * ".SHELL" lines in Makefiles can choose the default shell from the 213 # set defined here, or add additional shells. 214 */ 215 216 #ifdef DEFSHELL_CUSTOM 217 #define DEFSHELL_INDEX_CUSTOM 0 218 #define DEFSHELL_INDEX_SH 1 219 #define DEFSHELL_INDEX_KSH 2 220 #define DEFSHELL_INDEX_CSH 3 221 #else /* !DEFSHELL_CUSTOM */ 222 #define DEFSHELL_INDEX_SH 0 223 #define DEFSHELL_INDEX_KSH 1 224 #define DEFSHELL_INDEX_CSH 2 225 #endif /* !DEFSHELL_CUSTOM */ 226 227 #ifndef DEFSHELL_INDEX 228 #define DEFSHELL_INDEX 0 /* DEFSHELL_INDEX_CUSTOM or DEFSHELL_INDEX_SH */ 229 #endif /* !DEFSHELL_INDEX */ 230 231 static Shell shells[] = { 232 #ifdef DEFSHELL_CUSTOM 233 /* 234 * An sh-compatible shell with a non-standard name. 235 * 236 * Keep this in sync with the "sh" description below, but avoid 237 * non-portable features that might not be supplied by all 238 * sh-compatible shells. 239 */ 240 { 241 DEFSHELL_CUSTOM, 242 FALSE, "", "", "", 0, 243 FALSE, "echo \"%s\"\n", "%s\n", "{ %s \n} || exit $?\n", "'\n'", '#', 244 "", 245 "", 246 }, 247 #endif /* DEFSHELL_CUSTOM */ 248 /* 249 * SH description. Echo control is also possible and, under 250 * sun UNIX anyway, one can even control error checking. 251 */ 252 { 253 "sh", 254 FALSE, "", "", "", 0, 255 FALSE, "echo \"%s\"\n", "%s\n", "{ %s \n} || exit $?\n", "'\n'", '#', 256 #if defined(MAKE_NATIVE) && defined(__NetBSD__) 257 "q", 258 #else 259 "", 260 #endif 261 "", 262 }, 263 /* 264 * KSH description. 265 */ 266 { 267 "ksh", 268 TRUE, "set +v", "set -v", "set +v", 6, 269 FALSE, "echo \"%s\"\n", "%s\n", "{ %s \n} || exit $?\n", "'\n'", '#', 270 "v", 271 "", 272 }, 273 /* 274 * CSH description. The csh can do echo control by playing 275 * with the setting of the 'echo' shell variable. Sadly, 276 * however, it is unable to do error control nicely. 277 */ 278 { 279 "csh", 280 TRUE, "unset verbose", "set verbose", "unset verbose", 10, 281 FALSE, "echo \"%s\"\n", "csh -c \"%s || exit 0\"\n", "", "'\\\n'", '#', 282 "v", "e", 283 }, 284 /* 285 * UNKNOWN. 286 */ 287 { 288 NULL, 289 FALSE, NULL, NULL, NULL, 0, 290 FALSE, NULL, NULL, NULL, NULL, 0, 291 NULL, NULL, 292 } 293 }; 294 static Shell *commandShell = &shells[DEFSHELL_INDEX]; /* this is the shell to 295 * which we pass all 296 * commands in the Makefile. 297 * It is set by the 298 * Job_ParseShell function */ 299 const char *shellPath = NULL, /* full pathname of 300 * executable image */ 301 *shellName = NULL; /* last component of shell */ 302 static const char *shellArgv = NULL; /* Custom shell args */ 303 304 305 STATIC Job *job_table; /* The structures that describe them */ 306 STATIC Job *job_table_end; /* job_table + maxJobs */ 307 static int wantToken; /* we want a token */ 308 static int lurking_children = 0; 309 static int make_suspended = 0; /* non-zero if we've seen a SIGTSTP (etc) */ 310 311 /* 312 * Set of descriptors of pipes connected to 313 * the output channels of children 314 */ 315 static struct pollfd *fds = NULL; 316 static Job **jobfds = NULL; 317 static int nfds = 0; 318 static void watchfd(Job *); 319 static void clearfd(Job *); 320 static int readyfd(Job *); 321 322 STATIC GNode *lastNode; /* The node for which output was most recently 323 * produced. */ 324 STATIC const char *targFmt; /* Format string to use to head output from a 325 * job when it's not the most-recent job heard 326 * from */ 327 static char *targPrefix = NULL; /* What we print at the start of targFmt */ 328 static Job tokenWaitJob; /* token wait pseudo-job */ 329 330 static Job childExitJob; /* child exit pseudo-job */ 331 #define CHILD_EXIT "." 332 #define DO_JOB_RESUME "R" 333 334 #define TARG_FMT "%s %s ---\n" /* Default format */ 335 #define MESSAGE(fp, gn) \ 336 (void)fprintf(fp, targFmt, targPrefix, gn->name) 337 338 static sigset_t caught_signals; /* Set of signals we handle */ 339 #if defined(SYSV) 340 #define KILLPG(pid, sig) kill(-(pid), (sig)) 341 #else 342 #define KILLPG(pid, sig) killpg((pid), (sig)) 343 #endif 344 345 static void JobChildSig(int); 346 static void JobContinueSig(int); 347 static Job *JobFindPid(int, int); 348 static int JobPrintCommand(ClientData, ClientData); 349 static int JobSaveCommand(ClientData, ClientData); 350 static void JobClose(Job *); 351 static void JobExec(Job *, char **); 352 static void JobMakeArgv(Job *, char **); 353 static int JobStart(GNode *, int); 354 static char *JobOutput(Job *, char *, char *, int); 355 static void JobDoOutput(Job *, Boolean); 356 static Shell *JobMatchShell(const char *); 357 static void JobInterrupt(int, int); 358 static void JobRestartJobs(void); 359 static void JobTokenAdd(void); 360 static void JobSigLock(sigset_t *); 361 static void JobSigUnlock(sigset_t *); 362 static void JobSigReset(void); 363 364 const char *malloc_options="A"; 365 366 static void 367 job_table_dump(const char *where) 368 { 369 Job *job; 370 371 fprintf(debug_file, "job table @ %s\n", where); 372 for (job = job_table; job < job_table_end; job++) { 373 fprintf(debug_file, "job %d, status %d, flags %d, pid %d\n", 374 (int)(job - job_table), job->job_state, job->flags, job->pid); 375 } 376 } 377 378 /* 379 * JobSigLock/JobSigUnlock 380 * 381 * Signal lock routines to get exclusive access. Currently used to 382 * protect `jobs' and `stoppedJobs' list manipulations. 383 */ 384 static void JobSigLock(sigset_t *omaskp) 385 { 386 if (sigprocmask(SIG_BLOCK, &caught_signals, omaskp) != 0) { 387 Punt("JobSigLock: sigprocmask: %s", strerror(errno)); 388 sigemptyset(omaskp); 389 } 390 } 391 392 static void JobSigUnlock(sigset_t *omaskp) 393 { 394 (void)sigprocmask(SIG_SETMASK, omaskp, NULL); 395 } 396 397 static void 398 JobCreatePipe(Job *job, int minfd) 399 { 400 int i, fd; 401 402 if (pipe(job->jobPipe) == -1) 403 Punt("Cannot create pipe: %s", strerror(errno)); 404 405 /* Set close-on-exec flag for both */ 406 (void)fcntl(job->jobPipe[0], F_SETFD, 1); 407 (void)fcntl(job->jobPipe[1], F_SETFD, 1); 408 409 /* 410 * We mark the input side of the pipe non-blocking; we poll(2) the 411 * pipe when we're waiting for a job token, but we might lose the 412 * race for the token when a new one becomes available, so the read 413 * from the pipe should not block. 414 */ 415 fcntl(job->jobPipe[0], F_SETFL, 416 fcntl(job->jobPipe[0], F_GETFL, 0) | O_NONBLOCK); 417 418 for (i = 0; i < 2; i++) { 419 /* Avoid using low numbered fds */ 420 fd = fcntl(job->jobPipe[i], F_DUPFD, minfd); 421 if (fd != -1) { 422 close(job->jobPipe[i]); 423 job->jobPipe[i] = fd; 424 } 425 } 426 } 427 428 /*- 429 *----------------------------------------------------------------------- 430 * JobCondPassSig -- 431 * Pass a signal to a job 432 * 433 * Input: 434 * signop Signal to send it 435 * 436 * Side Effects: 437 * None, except the job may bite it. 438 * 439 *----------------------------------------------------------------------- 440 */ 441 static void 442 JobCondPassSig(int signo) 443 { 444 Job *job; 445 446 if (DEBUG(JOB)) { 447 (void)fprintf(debug_file, "JobCondPassSig(%d) called.\n", signo); 448 } 449 450 for (job = job_table; job < job_table_end; job++) { 451 if (job->job_state != JOB_ST_RUNNING) 452 continue; 453 if (DEBUG(JOB)) { 454 (void)fprintf(debug_file, 455 "JobCondPassSig passing signal %d to child %d.\n", 456 signo, job->pid); 457 } 458 KILLPG(job->pid, signo); 459 } 460 } 461 462 /*- 463 *----------------------------------------------------------------------- 464 * JobChldSig -- 465 * SIGCHLD handler. 466 * 467 * Input: 468 * signo The signal number we've received 469 * 470 * Results: 471 * None. 472 * 473 * Side Effects: 474 * Sends a token on the child exit pipe to wake us up from 475 * select()/poll(). 476 * 477 *----------------------------------------------------------------------- 478 */ 479 static void 480 JobChildSig(int signo __unused) 481 { 482 write(childExitJob.outPipe, CHILD_EXIT, 1); 483 } 484 485 486 /*- 487 *----------------------------------------------------------------------- 488 * JobContinueSig -- 489 * Resume all stopped jobs. 490 * 491 * Input: 492 * signo The signal number we've received 493 * 494 * Results: 495 * None. 496 * 497 * Side Effects: 498 * Jobs start running again. 499 * 500 *----------------------------------------------------------------------- 501 */ 502 static void 503 JobContinueSig(int signo __unused) 504 { 505 /* 506 * Defer sending to SIGCONT to our stopped children until we return 507 * from the signal handler. 508 */ 509 write(childExitJob.outPipe, DO_JOB_RESUME, 1); 510 } 511 512 /*- 513 *----------------------------------------------------------------------- 514 * JobPassSig -- 515 * Pass a signal on to all jobs, then resend to ourselves. 516 * 517 * Input: 518 * signo The signal number we've received 519 * 520 * Results: 521 * None. 522 * 523 * Side Effects: 524 * We die by the same signal. 525 * 526 *----------------------------------------------------------------------- 527 */ 528 static void 529 JobPassSig_int(int signo) 530 { 531 /* Run .INTERRUPT target then exit */ 532 JobInterrupt(TRUE, signo); 533 } 534 535 static void 536 JobPassSig_term(int signo) 537 { 538 /* Dont run .INTERRUPT target then exit */ 539 JobInterrupt(FALSE, signo); 540 } 541 542 static void 543 JobPassSig_suspend(int signo) 544 { 545 sigset_t nmask, omask; 546 struct sigaction act; 547 548 /* Suppress job started/continued messages */ 549 make_suspended = 1; 550 551 /* Pass the signal onto every job */ 552 JobCondPassSig(signo); 553 554 /* 555 * Send ourselves the signal now we've given the message to everyone else. 556 * Note we block everything else possible while we're getting the signal. 557 * This ensures that all our jobs get continued when we wake up before 558 * we take any other signal. 559 */ 560 sigfillset(&nmask); 561 sigdelset(&nmask, signo); 562 (void)sigprocmask(SIG_SETMASK, &nmask, &omask); 563 564 act.sa_handler = SIG_DFL; 565 sigemptyset(&act.sa_mask); 566 act.sa_flags = 0; 567 (void)sigaction(signo, &act, NULL); 568 569 if (DEBUG(JOB)) { 570 (void)fprintf(debug_file, 571 "JobPassSig passing signal %d to self.\n", signo); 572 } 573 574 (void)kill(getpid(), signo); 575 576 /* 577 * We've been continued. 578 * 579 * A whole host of signals continue to happen! 580 * SIGCHLD for any processes that actually suspended themselves. 581 * SIGCHLD for any processes that exited while we were alseep. 582 * The SIGCONT that actually caused us to wakeup. 583 * 584 * Since we defer passing the SIGCONT on to our children until 585 * the main processing loop, we can be sure that all the SIGCHLD 586 * events will have happened by then - and that the waitpid() will 587 * collect the child 'suspended' events. 588 * For correct sequencing we just need to ensure we process the 589 * waitpid() before passign on the SIGCONT. 590 * 591 * In any case nothing else is needed here. 592 */ 593 594 /* Restore handler and signal mask */ 595 act.sa_handler = JobPassSig_suspend; 596 (void)sigaction(signo, &act, NULL); 597 (void)sigprocmask(SIG_SETMASK, &omask, NULL); 598 } 599 600 /*- 601 *----------------------------------------------------------------------- 602 * JobFindPid -- 603 * Compare the pid of the job with the given pid and return 0 if they 604 * are equal. This function is called from Job_CatchChildren 605 * to find the job descriptor of the finished job. 606 * 607 * Input: 608 * job job to examine 609 * pid process id desired 610 * 611 * Results: 612 * Job with matching pid 613 * 614 * Side Effects: 615 * None 616 *----------------------------------------------------------------------- 617 */ 618 static Job * 619 JobFindPid(int pid, int status) 620 { 621 Job *job; 622 623 for (job = job_table; job < job_table_end; job++) { 624 if ((job->job_state == status) && job->pid == pid) 625 return job; 626 } 627 if (DEBUG(JOB)) 628 job_table_dump("no pid"); 629 return NULL; 630 } 631 632 /*- 633 *----------------------------------------------------------------------- 634 * JobPrintCommand -- 635 * Put out another command for the given job. If the command starts 636 * with an @ or a - we process it specially. In the former case, 637 * so long as the -s and -n flags weren't given to make, we stick 638 * a shell-specific echoOff command in the script. In the latter, 639 * we ignore errors for the entire job, unless the shell has error 640 * control. 641 * If the command is just "..." we take all future commands for this 642 * job to be commands to be executed once the entire graph has been 643 * made and return non-zero to signal that the end of the commands 644 * was reached. These commands are later attached to the postCommands 645 * node and executed by Job_End when all things are done. 646 * This function is called from JobStart via Lst_ForEach. 647 * 648 * Input: 649 * cmdp command string to print 650 * jobp job for which to print it 651 * 652 * Results: 653 * Always 0, unless the command was "..." 654 * 655 * Side Effects: 656 * If the command begins with a '-' and the shell has no error control, 657 * the JOB_IGNERR flag is set in the job descriptor. 658 * If the command is "..." and we're not ignoring such things, 659 * tailCmds is set to the successor node of the cmd. 660 * numCommands is incremented if the command is actually printed. 661 *----------------------------------------------------------------------- 662 */ 663 static int 664 JobPrintCommand(ClientData cmdp, ClientData jobp) 665 { 666 Boolean noSpecials; /* true if we shouldn't worry about 667 * inserting special commands into 668 * the input stream. */ 669 Boolean shutUp = FALSE; /* true if we put a no echo command 670 * into the command file */ 671 Boolean errOff = FALSE; /* true if we turned error checking 672 * off before printing the command 673 * and need to turn it back on */ 674 const char *cmdTemplate; /* Template to use when printing the 675 * command */ 676 char *cmdStart; /* Start of expanded command */ 677 char *escCmd = NULL; /* Command with quotes/backticks escaped */ 678 char *cmd = (char *)cmdp; 679 Job *job = (Job *)jobp; 680 char *cp, *tmp; 681 int i, j; 682 683 noSpecials = NoExecute(job->node); 684 685 if (strcmp(cmd, "...") == 0) { 686 job->node->type |= OP_SAVE_CMDS; 687 if ((job->flags & JOB_IGNDOTS) == 0) { 688 job->tailCmds = Lst_Succ(Lst_Member(job->node->commands, 689 cmd)); 690 return 1; 691 } 692 return 0; 693 } 694 695 #define DBPRINTF(fmt, arg) if (DEBUG(JOB)) { \ 696 (void)fprintf(debug_file, fmt, arg); \ 697 } \ 698 (void)fprintf(job->cmdFILE, fmt, arg); \ 699 (void)fflush(job->cmdFILE); 700 701 numCommands += 1; 702 703 cmdStart = cmd = Var_Subst(NULL, cmd, job->node, FALSE); 704 705 cmdTemplate = "%s\n"; 706 707 /* 708 * Check for leading @' and -'s to control echoing and error checking. 709 */ 710 while (*cmd == '@' || *cmd == '-' || (*cmd == '+')) { 711 switch (*cmd) { 712 case '@': 713 shutUp = TRUE; 714 break; 715 case '-': 716 errOff = TRUE; 717 break; 718 case '+': 719 if (noSpecials) { 720 /* 721 * We're not actually executing anything... 722 * but this one needs to be - use compat mode just for it. 723 */ 724 CompatRunCommand(cmdp, job->node); 725 return 0; 726 } 727 break; 728 } 729 cmd++; 730 } 731 732 while (isspace((unsigned char) *cmd)) 733 cmd++; 734 735 /* 736 * If the shell doesn't have error control the alternate echo'ing will 737 * be done (to avoid showing additional error checking code) 738 * and this will need the characters '$ ` \ "' escaped 739 */ 740 741 if (!commandShell->hasErrCtl) { 742 /* Worst that could happen is every char needs escaping. */ 743 escCmd = emalloc((strlen(cmd) * 2) + 1); 744 for (i = 0, j= 0; cmd[i] != '\0'; i++, j++) { 745 if (cmd[i] == '$' || cmd[i] == '`' || cmd[i] == '\\' || 746 cmd[i] == '"') 747 escCmd[j++] = '\\'; 748 escCmd[j] = cmd[i]; 749 } 750 escCmd[j] = 0; 751 } 752 753 if (shutUp) { 754 if (!(job->flags & JOB_SILENT) && !noSpecials && 755 commandShell->hasEchoCtl) { 756 DBPRINTF("%s\n", commandShell->echoOff); 757 } else { 758 if (commandShell->hasErrCtl) 759 shutUp = FALSE; 760 } 761 } 762 763 if (errOff) { 764 if ( !(job->flags & JOB_IGNERR) && !noSpecials) { 765 if (commandShell->hasErrCtl) { 766 /* 767 * we don't want the error-control commands showing 768 * up either, so we turn off echoing while executing 769 * them. We could put another field in the shell 770 * structure to tell JobDoOutput to look for this 771 * string too, but why make it any more complex than 772 * it already is? 773 */ 774 if (!(job->flags & JOB_SILENT) && !shutUp && 775 commandShell->hasEchoCtl) { 776 DBPRINTF("%s\n", commandShell->echoOff); 777 DBPRINTF("%s\n", commandShell->ignErr); 778 DBPRINTF("%s\n", commandShell->echoOn); 779 } else { 780 DBPRINTF("%s\n", commandShell->ignErr); 781 } 782 } else if (commandShell->ignErr && 783 (*commandShell->ignErr != '\0')) 784 { 785 /* 786 * The shell has no error control, so we need to be 787 * weird to get it to ignore any errors from the command. 788 * If echoing is turned on, we turn it off and use the 789 * errCheck template to echo the command. Leave echoing 790 * off so the user doesn't see the weirdness we go through 791 * to ignore errors. Set cmdTemplate to use the weirdness 792 * instead of the simple "%s\n" template. 793 */ 794 if (!(job->flags & JOB_SILENT) && !shutUp) { 795 if (commandShell->hasEchoCtl) { 796 DBPRINTF("%s\n", commandShell->echoOff); 797 } 798 DBPRINTF(commandShell->errCheck, escCmd); 799 shutUp = TRUE; 800 } else { 801 if (!shutUp) { 802 DBPRINTF(commandShell->errCheck, escCmd); 803 } 804 } 805 cmdTemplate = commandShell->ignErr; 806 /* 807 * The error ignoration (hee hee) is already taken care 808 * of by the ignErr template, so pretend error checking 809 * is still on. 810 */ 811 errOff = FALSE; 812 } else { 813 errOff = FALSE; 814 } 815 } else { 816 errOff = FALSE; 817 } 818 } else { 819 820 /* 821 * If errors are being checked and the shell doesn't have error control 822 * but does supply an errOut template, then setup commands to run 823 * through it. 824 */ 825 826 if (!commandShell->hasErrCtl && commandShell->errOut && 827 (*commandShell->errOut != '\0')) { 828 if (!(job->flags & JOB_SILENT) && !shutUp) { 829 if (commandShell->hasEchoCtl) { 830 DBPRINTF("%s\n", commandShell->echoOff); 831 } 832 DBPRINTF(commandShell->errCheck, escCmd); 833 shutUp = TRUE; 834 } 835 /* If it's a comment line or blank, treat as an ignored error */ 836 if ((escCmd[0] == commandShell->commentChar) || 837 (escCmd[0] == 0)) 838 cmdTemplate = commandShell->ignErr; 839 else 840 cmdTemplate = commandShell->errOut; 841 errOff = FALSE; 842 } 843 } 844 845 if (DEBUG(SHELL) && strcmp(shellName, "sh") == 0 && 846 (job->flags & JOB_TRACED) == 0) { 847 DBPRINTF("set -%s\n", "x"); 848 job->flags |= JOB_TRACED; 849 } 850 851 if ((cp = Check_Cwd_Cmd(cmd)) != NULL) { 852 DBPRINTF("test -d %s && ", cp); 853 DBPRINTF("cd %s\n", cp); 854 } 855 856 DBPRINTF(cmdTemplate, cmd); 857 free(cmdStart); 858 if (escCmd) 859 free(escCmd); 860 if (errOff) { 861 /* 862 * If echoing is already off, there's no point in issuing the 863 * echoOff command. Otherwise we issue it and pretend it was on 864 * for the whole command... 865 */ 866 if (!shutUp && !(job->flags & JOB_SILENT) && commandShell->hasEchoCtl){ 867 DBPRINTF("%s\n", commandShell->echoOff); 868 shutUp = TRUE; 869 } 870 DBPRINTF("%s\n", commandShell->errCheck); 871 } 872 if (shutUp && commandShell->hasEchoCtl) { 873 DBPRINTF("%s\n", commandShell->echoOn); 874 } 875 if (cp != NULL) { 876 DBPRINTF("test -d %s && ", cp); 877 DBPRINTF("cd %s\n", Var_Value(".OBJDIR", VAR_GLOBAL, &tmp)); 878 } 879 return 0; 880 } 881 882 /*- 883 *----------------------------------------------------------------------- 884 * JobSaveCommand -- 885 * Save a command to be executed when everything else is done. 886 * Callback function for JobFinish... 887 * 888 * Results: 889 * Always returns 0 890 * 891 * Side Effects: 892 * The command is tacked onto the end of postCommands's commands list. 893 * 894 *----------------------------------------------------------------------- 895 */ 896 static int 897 JobSaveCommand(ClientData cmd, ClientData gn) 898 { 899 cmd = Var_Subst(NULL, (char *)cmd, (GNode *)gn, FALSE); 900 (void)Lst_AtEnd(postCommands->commands, cmd); 901 return(0); 902 } 903 904 905 /*- 906 *----------------------------------------------------------------------- 907 * JobClose -- 908 * Called to close both input and output pipes when a job is finished. 909 * 910 * Results: 911 * Nada 912 * 913 * Side Effects: 914 * The file descriptors associated with the job are closed. 915 * 916 *----------------------------------------------------------------------- 917 */ 918 static void 919 JobClose(Job *job) 920 { 921 clearfd(job); 922 (void)close(job->outPipe); 923 job->outPipe = -1; 924 925 JobDoOutput(job, TRUE); 926 (void)close(job->inPipe); 927 job->inPipe = -1; 928 } 929 930 /*- 931 *----------------------------------------------------------------------- 932 * JobFinish -- 933 * Do final processing for the given job including updating 934 * parents and starting new jobs as available/necessary. Note 935 * that we pay no attention to the JOB_IGNERR flag here. 936 * This is because when we're called because of a noexecute flag 937 * or something, jstat.w_status is 0 and when called from 938 * Job_CatchChildren, the status is zeroed if it s/b ignored. 939 * 940 * Input: 941 * job job to finish 942 * status sub-why job went away 943 * 944 * Results: 945 * None 946 * 947 * Side Effects: 948 * Final commands for the job are placed on postCommands. 949 * 950 * If we got an error and are aborting (aborting == ABORT_ERROR) and 951 * the job list is now empty, we are done for the day. 952 * If we recognized an error (errors !=0), we set the aborting flag 953 * to ABORT_ERROR so no more jobs will be started. 954 *----------------------------------------------------------------------- 955 */ 956 /*ARGSUSED*/ 957 static void 958 JobFinish(Job *job, int status) 959 { 960 Boolean done, return_job_token; 961 962 if (DEBUG(JOB)) { 963 fprintf(debug_file, "Jobfinish: %d [%s], status %d\n", 964 job->pid, job->node->name, status); 965 } 966 967 if ((WIFEXITED(status) && 968 (((WEXITSTATUS(status) != 0) && !(job->flags & JOB_IGNERR)))) || 969 WIFSIGNALED(status)) 970 { 971 /* 972 * If it exited non-zero and either we're doing things our 973 * way or we're not ignoring errors, the job is finished. 974 * Similarly, if the shell died because of a signal 975 * the job is also finished. In these 976 * cases, finish out the job's output before printing the exit 977 * status... 978 */ 979 JobClose(job); 980 if (job->cmdFILE != NULL && job->cmdFILE != stdout) { 981 (void)fclose(job->cmdFILE); 982 job->cmdFILE = NULL; 983 } 984 done = TRUE; 985 } else if (WIFEXITED(status)) { 986 /* 987 * Deal with ignored errors in -B mode. We need to print a message 988 * telling of the ignored error as well as setting status.w_status 989 * to 0 so the next command gets run. To do this, we set done to be 990 * TRUE if in -B mode and the job exited non-zero. 991 */ 992 done = WEXITSTATUS(status) != 0; 993 /* 994 * Old comment said: "Note we don't 995 * want to close down any of the streams until we know we're at the 996 * end." 997 * But we do. Otherwise when are we going to print the rest of the 998 * stuff? 999 */ 1000 JobClose(job); 1001 } else { 1002 /* 1003 * No need to close things down or anything. 1004 */ 1005 done = FALSE; 1006 } 1007 1008 if (done) { 1009 if (WIFEXITED(status)) { 1010 if (DEBUG(JOB)) { 1011 (void)fprintf(debug_file, "Process %d [%s] exited.\n", 1012 job->pid, job->node->name); 1013 } 1014 if (WEXITSTATUS(status) != 0) { 1015 if (job->node != lastNode) { 1016 MESSAGE(stdout, job->node); 1017 lastNode = job->node; 1018 } 1019 (void)printf("*** [%s] Error code %d%s\n", 1020 job->node->name, 1021 WEXITSTATUS(status), 1022 (job->flags & JOB_IGNERR) ? "(ignored)" : ""); 1023 if (job->flags & JOB_IGNERR) 1024 status = 0; 1025 } else if (DEBUG(JOB)) { 1026 if (job->node != lastNode) { 1027 MESSAGE(stdout, job->node); 1028 lastNode = job->node; 1029 } 1030 (void)printf("*** [%s] Completed successfully\n", 1031 job->node->name); 1032 } 1033 } else { 1034 if (job->node != lastNode) { 1035 MESSAGE(stdout, job->node); 1036 lastNode = job->node; 1037 } 1038 (void)printf("*** [%s] Signal %d\n", 1039 job->node->name, WTERMSIG(status)); 1040 } 1041 (void)fflush(stdout); 1042 } 1043 1044 return_job_token = FALSE; 1045 1046 Trace_Log(JOBEND, job); 1047 if (!(job->flags & JOB_SPECIAL)) { 1048 if ((status != 0) || 1049 (aborting == ABORT_ERROR) || 1050 (aborting == ABORT_INTERRUPT)) 1051 return_job_token = TRUE; 1052 } 1053 1054 if ((aborting != ABORT_ERROR) && (aborting != ABORT_INTERRUPT) && (status == 0)) { 1055 /* 1056 * As long as we aren't aborting and the job didn't return a non-zero 1057 * status that we shouldn't ignore, we call Make_Update to update 1058 * the parents. In addition, any saved commands for the node are placed 1059 * on the .END target. 1060 */ 1061 if (job->tailCmds != NILLNODE) { 1062 Lst_ForEachFrom(job->node->commands, job->tailCmds, 1063 JobSaveCommand, 1064 job->node); 1065 } 1066 job->node->made = MADE; 1067 if (!(job->flags & JOB_SPECIAL)) 1068 return_job_token = TRUE; 1069 Make_Update(job->node); 1070 job->job_state = JOB_ST_FREE; 1071 } else if (status != 0) { 1072 errors += 1; 1073 job->job_state = JOB_ST_FREE; 1074 } 1075 1076 /* 1077 * Set aborting if any error. 1078 */ 1079 if (errors && !keepgoing && (aborting != ABORT_INTERRUPT)) { 1080 /* 1081 * If we found any errors in this batch of children and the -k flag 1082 * wasn't given, we set the aborting flag so no more jobs get 1083 * started. 1084 */ 1085 aborting = ABORT_ERROR; 1086 } 1087 1088 if (return_job_token) 1089 Job_TokenReturn(); 1090 1091 if (aborting == ABORT_ERROR && jobTokensRunning == 0) { 1092 /* 1093 * If we are aborting and the job table is now empty, we finish. 1094 */ 1095 Finish(errors); 1096 } 1097 } 1098 1099 /*- 1100 *----------------------------------------------------------------------- 1101 * Job_Touch -- 1102 * Touch the given target. Called by JobStart when the -t flag was 1103 * given 1104 * 1105 * Input: 1106 * gn the node of the file to touch 1107 * silent TRUE if should not print message 1108 * 1109 * Results: 1110 * None 1111 * 1112 * Side Effects: 1113 * The data modification of the file is changed. In addition, if the 1114 * file did not exist, it is created. 1115 *----------------------------------------------------------------------- 1116 */ 1117 void 1118 Job_Touch(GNode *gn, Boolean silent) 1119 { 1120 int streamID; /* ID of stream opened to do the touch */ 1121 struct utimbuf times; /* Times for utime() call */ 1122 1123 if (gn->type & (OP_JOIN|OP_USE|OP_USEBEFORE|OP_EXEC|OP_OPTIONAL|OP_PHONY)) { 1124 /* 1125 * .JOIN, .USE, .ZEROTIME and .OPTIONAL targets are "virtual" targets 1126 * and, as such, shouldn't really be created. 1127 */ 1128 return; 1129 } 1130 1131 if (!silent || NoExecute(gn)) { 1132 (void)fprintf(stdout, "touch %s\n", gn->name); 1133 (void)fflush(stdout); 1134 } 1135 1136 if (NoExecute(gn)) { 1137 return; 1138 } 1139 1140 if (gn->type & OP_ARCHV) { 1141 Arch_Touch(gn); 1142 } else if (gn->type & OP_LIB) { 1143 Arch_TouchLib(gn); 1144 } else { 1145 char *file = gn->path ? gn->path : gn->name; 1146 1147 times.actime = times.modtime = now; 1148 if (utime(file, ×) < 0){ 1149 streamID = open(file, O_RDWR | O_CREAT, 0666); 1150 1151 if (streamID >= 0) { 1152 char c; 1153 1154 /* 1155 * Read and write a byte to the file to change the 1156 * modification time, then close the file. 1157 */ 1158 if (read(streamID, &c, 1) == 1) { 1159 (void)lseek(streamID, (off_t)0, SEEK_SET); 1160 (void)write(streamID, &c, 1); 1161 } 1162 1163 (void)close(streamID); 1164 } else { 1165 (void)fprintf(stdout, "*** couldn't touch %s: %s", 1166 file, strerror(errno)); 1167 (void)fflush(stdout); 1168 } 1169 } 1170 } 1171 } 1172 1173 /*- 1174 *----------------------------------------------------------------------- 1175 * Job_CheckCommands -- 1176 * Make sure the given node has all the commands it needs. 1177 * 1178 * Input: 1179 * gn The target whose commands need verifying 1180 * abortProc Function to abort with message 1181 * 1182 * Results: 1183 * TRUE if the commands list is/was ok. 1184 * 1185 * Side Effects: 1186 * The node will have commands from the .DEFAULT rule added to it 1187 * if it needs them. 1188 *----------------------------------------------------------------------- 1189 */ 1190 Boolean 1191 Job_CheckCommands(GNode *gn, void (*abortProc)(const char *, ...)) 1192 { 1193 if (OP_NOP(gn->type) && Lst_IsEmpty(gn->commands) && 1194 ((gn->type & OP_LIB) == 0 || Lst_IsEmpty(gn->children))) { 1195 /* 1196 * No commands. Look for .DEFAULT rule from which we might infer 1197 * commands 1198 */ 1199 if ((DEFAULT != NILGNODE) && !Lst_IsEmpty(DEFAULT->commands) && 1200 (gn->type & OP_SPECIAL) == 0) { 1201 char *p1; 1202 /* 1203 * Make only looks for a .DEFAULT if the node was never the 1204 * target of an operator, so that's what we do too. If 1205 * a .DEFAULT was given, we substitute its commands for gn's 1206 * commands and set the IMPSRC variable to be the target's name 1207 * The DEFAULT node acts like a transformation rule, in that 1208 * gn also inherits any attributes or sources attached to 1209 * .DEFAULT itself. 1210 */ 1211 Make_HandleUse(DEFAULT, gn); 1212 Var_Set(IMPSRC, Var_Value(TARGET, gn, &p1), gn, 0); 1213 if (p1) 1214 free(p1); 1215 } else if (Dir_MTime(gn) == 0 && (gn->type & OP_SPECIAL) == 0) { 1216 /* 1217 * The node wasn't the target of an operator we have no .DEFAULT 1218 * rule to go on and the target doesn't already exist. There's 1219 * nothing more we can do for this branch. If the -k flag wasn't 1220 * given, we stop in our tracks, otherwise we just don't update 1221 * this node's parents so they never get examined. 1222 */ 1223 static const char msg[] = ": don't know how to make"; 1224 1225 if (gn->type & OP_OPTIONAL) { 1226 (void)fprintf(stdout, "%s%s %s(ignored)\n", progname, 1227 msg, gn->name); 1228 (void)fflush(stdout); 1229 } else if (keepgoing) { 1230 (void)fprintf(stdout, "%s%s %s(continuing)\n", progname, 1231 msg, gn->name); 1232 (void)fflush(stdout); 1233 return FALSE; 1234 } else { 1235 (*abortProc)("%s%s %s. Stop", progname, msg, gn->name); 1236 return FALSE; 1237 } 1238 } 1239 } 1240 return TRUE; 1241 } 1242 1243 /*- 1244 *----------------------------------------------------------------------- 1245 * JobExec -- 1246 * Execute the shell for the given job. Called from JobStart 1247 * 1248 * Input: 1249 * job Job to execute 1250 * 1251 * Results: 1252 * None. 1253 * 1254 * Side Effects: 1255 * A shell is executed, outputs is altered and the Job structure added 1256 * to the job table. 1257 * 1258 *----------------------------------------------------------------------- 1259 */ 1260 static void 1261 JobExec(Job *job, char **argv) 1262 { 1263 int cpid; /* ID of new child */ 1264 sigset_t mask; 1265 1266 job->flags &= ~JOB_TRACED; 1267 1268 if (DEBUG(JOB)) { 1269 int i; 1270 1271 (void)fprintf(debug_file, "Running %s %sly\n", job->node->name, "local"); 1272 (void)fprintf(debug_file, "\tCommand: "); 1273 for (i = 0; argv[i] != NULL; i++) { 1274 (void)fprintf(debug_file, "%s ", argv[i]); 1275 } 1276 (void)fprintf(debug_file, "\n"); 1277 } 1278 1279 /* 1280 * Some jobs produce no output and it's disconcerting to have 1281 * no feedback of their running (since they produce no output, the 1282 * banner with their name in it never appears). This is an attempt to 1283 * provide that feedback, even if nothing follows it. 1284 */ 1285 if ((lastNode != job->node) && !(job->flags & JOB_SILENT)) { 1286 MESSAGE(stdout, job->node); 1287 lastNode = job->node; 1288 } 1289 1290 /* No interruptions until this job is on the `jobs' list */ 1291 JobSigLock(&mask); 1292 1293 /* Pre-emptively mark job running, pid still zero though */ 1294 job->job_state = JOB_ST_RUNNING; 1295 1296 cpid = vfork(); 1297 if (cpid == -1) 1298 Punt("Cannot vfork: %s", strerror(errno)); 1299 1300 if (cpid == 0) { 1301 /* Child */ 1302 1303 /* 1304 * Reset all signal handlers; this is necessary because we also 1305 * need to unblock signals before we exec(2). 1306 */ 1307 JobSigReset(); 1308 1309 /* Now unblock signals */ 1310 sigemptyset(&mask); 1311 JobSigUnlock(&mask); 1312 1313 /* 1314 * Must duplicate the input stream down to the child's input and 1315 * reset it to the beginning (again). Since the stream was marked 1316 * close-on-exec, we must clear that bit in the new input. 1317 */ 1318 if (dup2(FILENO(job->cmdFILE), 0) == -1) { 1319 execError("dup2", "job->cmdFILE"); 1320 _exit(1); 1321 } 1322 (void)fcntl(0, F_SETFD, 0); 1323 (void)lseek(0, (off_t)0, SEEK_SET); 1324 1325 if (job->node->type & OP_MAKE) { 1326 /* 1327 * Pass job token pipe to submakes. 1328 */ 1329 fcntl(tokenWaitJob.inPipe, F_SETFD, 0); 1330 fcntl(tokenWaitJob.outPipe, F_SETFD, 0); 1331 } 1332 1333 /* 1334 * Set up the child's output to be routed through the pipe 1335 * we've created for it. 1336 */ 1337 if (dup2(job->outPipe, 1) == -1) { 1338 execError("dup2", "job->outPipe"); 1339 _exit(1); 1340 } 1341 /* 1342 * The output channels are marked close on exec. This bit was 1343 * duplicated by the dup2(on some systems), so we have to clear 1344 * it before routing the shell's error output to the same place as 1345 * its standard output. 1346 */ 1347 (void)fcntl(1, F_SETFD, 0); 1348 if (dup2(1, 2) == -1) { 1349 execError("dup2", "1, 2"); 1350 _exit(1); 1351 } 1352 1353 /* 1354 * We want to switch the child into a different process family so 1355 * we can kill it and all its descendants in one fell swoop, 1356 * by killing its process family, but not commit suicide. 1357 */ 1358 #if defined(SYSV) 1359 /* XXX: dsl - I'm sure this should be setpgrp()... */ 1360 (void)setsid(); 1361 #else 1362 (void)setpgid(0, getpid()); 1363 #endif 1364 1365 Var_ExportVars(); 1366 1367 (void)execv(shellPath, argv); 1368 execError("exec", shellPath); 1369 _exit(1); 1370 } 1371 1372 /* Parent, continuing after the child exec */ 1373 job->pid = cpid; 1374 1375 Trace_Log(JOBSTART, job); 1376 1377 /* 1378 * Set the current position in the buffer to the beginning 1379 * and mark another stream to watch in the outputs mask 1380 */ 1381 job->curPos = 0; 1382 1383 watchfd(job); 1384 1385 if (job->cmdFILE != NULL && job->cmdFILE != stdout) { 1386 (void)fclose(job->cmdFILE); 1387 job->cmdFILE = NULL; 1388 } 1389 1390 /* 1391 * Now the job is actually running, add it to the table. 1392 */ 1393 if (DEBUG(JOB)) { 1394 fprintf(debug_file, "JobExec(%s): pid %d added to jobs table\n", 1395 job->node->name, job->pid); 1396 job_table_dump("job started"); 1397 } 1398 JobSigUnlock(&mask); 1399 } 1400 1401 /*- 1402 *----------------------------------------------------------------------- 1403 * JobMakeArgv -- 1404 * Create the argv needed to execute the shell for a given job. 1405 * 1406 * 1407 * Results: 1408 * 1409 * Side Effects: 1410 * 1411 *----------------------------------------------------------------------- 1412 */ 1413 static void 1414 JobMakeArgv(Job *job, char **argv) 1415 { 1416 int argc; 1417 static char args[10]; /* For merged arguments */ 1418 1419 argv[0] = UNCONST(shellName); 1420 argc = 1; 1421 1422 if ((commandShell->exit && (*commandShell->exit != '-')) || 1423 (commandShell->echo && (*commandShell->echo != '-'))) 1424 { 1425 /* 1426 * At least one of the flags doesn't have a minus before it, so 1427 * merge them together. Have to do this because the *(&(@*#*&#$# 1428 * Bourne shell thinks its second argument is a file to source. 1429 * Grrrr. Note the ten-character limitation on the combined arguments. 1430 */ 1431 (void)snprintf(args, sizeof(args), "-%s%s", 1432 ((job->flags & JOB_IGNERR) ? "" : 1433 (commandShell->exit ? commandShell->exit : "")), 1434 ((job->flags & JOB_SILENT) ? "" : 1435 (commandShell->echo ? commandShell->echo : ""))); 1436 1437 if (args[1]) { 1438 argv[argc] = args; 1439 argc++; 1440 } 1441 } else { 1442 if (!(job->flags & JOB_IGNERR) && commandShell->exit) { 1443 argv[argc] = UNCONST(commandShell->exit); 1444 argc++; 1445 } 1446 if (!(job->flags & JOB_SILENT) && commandShell->echo) { 1447 argv[argc] = UNCONST(commandShell->echo); 1448 argc++; 1449 } 1450 } 1451 argv[argc] = NULL; 1452 } 1453 1454 /*- 1455 *----------------------------------------------------------------------- 1456 * JobStart -- 1457 * Start a target-creation process going for the target described 1458 * by the graph node gn. 1459 * 1460 * Input: 1461 * gn target to create 1462 * flags flags for the job to override normal ones. 1463 * e.g. JOB_SPECIAL or JOB_IGNDOTS 1464 * previous The previous Job structure for this node, if any. 1465 * 1466 * Results: 1467 * JOB_ERROR if there was an error in the commands, JOB_FINISHED 1468 * if there isn't actually anything left to do for the job and 1469 * JOB_RUNNING if the job has been started. 1470 * 1471 * Side Effects: 1472 * A new Job node is created and added to the list of running 1473 * jobs. PMake is forked and a child shell created. 1474 * 1475 * NB: I'm fairly sure that this code is never called with JOB_SPECIAL set 1476 * JOB_IGNDOTS is never set (dsl) 1477 * Also the return value is ignored by everyone. 1478 *----------------------------------------------------------------------- 1479 */ 1480 static int 1481 JobStart(GNode *gn, int flags) 1482 { 1483 Job *job; /* new job descriptor */ 1484 char *argv[10]; /* Argument vector to shell */ 1485 Boolean cmdsOK; /* true if the nodes commands were all right */ 1486 Boolean noExec; /* Set true if we decide not to run the job */ 1487 int tfd; /* File descriptor to the temp file */ 1488 1489 for (job = job_table; job < job_table_end; job++) { 1490 if (job->job_state == JOB_ST_FREE) 1491 break; 1492 } 1493 if (job >= job_table_end) 1494 Punt("JobStart no job slots vacant"); 1495 1496 memset(job, 0, sizeof *job); 1497 job->job_state = JOB_ST_SETUP; 1498 if (gn->type & OP_SPECIAL) 1499 flags |= JOB_SPECIAL; 1500 1501 job->node = gn; 1502 job->tailCmds = NILLNODE; 1503 1504 /* 1505 * Set the initial value of the flags for this job based on the global 1506 * ones and the node's attributes... Any flags supplied by the caller 1507 * are also added to the field. 1508 */ 1509 job->flags = 0; 1510 if (Targ_Ignore(gn)) { 1511 job->flags |= JOB_IGNERR; 1512 } 1513 if (Targ_Silent(gn)) { 1514 job->flags |= JOB_SILENT; 1515 } 1516 job->flags |= flags; 1517 1518 /* 1519 * Check the commands now so any attributes from .DEFAULT have a chance 1520 * to migrate to the node 1521 */ 1522 cmdsOK = Job_CheckCommands(gn, Error); 1523 1524 job->inPollfd = NULL; 1525 /* 1526 * If the -n flag wasn't given, we open up OUR (not the child's) 1527 * temporary file to stuff commands in it. The thing is rd/wr so we don't 1528 * need to reopen it to feed it to the shell. If the -n flag *was* given, 1529 * we just set the file to be stdout. Cute, huh? 1530 */ 1531 if (((gn->type & OP_MAKE) && !(noRecursiveExecute)) || 1532 (!noExecute && !touchFlag)) { 1533 /* 1534 * tfile is the name of a file into which all shell commands are 1535 * put. It is used over by removing it before the child shell is 1536 * executed. The XXXXXX in the string are replaced by the pid of 1537 * the make process in a 6-character field with leading zeroes. 1538 */ 1539 char tfile[sizeof(TMPPAT)]; 1540 sigset_t mask; 1541 /* 1542 * We're serious here, but if the commands were bogus, we're 1543 * also dead... 1544 */ 1545 if (!cmdsOK) { 1546 DieHorribly(); 1547 } 1548 1549 JobSigLock(&mask); 1550 (void)strcpy(tfile, TMPPAT); 1551 if ((tfd = mkstemp(tfile)) == -1) 1552 Punt("Could not create temporary file %s", strerror(errno)); 1553 if (!DEBUG(SCRIPT)) 1554 (void)eunlink(tfile); 1555 JobSigUnlock(&mask); 1556 1557 job->cmdFILE = fdopen(tfd, "w+"); 1558 if (job->cmdFILE == NULL) { 1559 Punt("Could not fdopen %s", tfile); 1560 } 1561 (void)fcntl(FILENO(job->cmdFILE), F_SETFD, 1); 1562 /* 1563 * Send the commands to the command file, flush all its buffers then 1564 * rewind and remove the thing. 1565 */ 1566 noExec = FALSE; 1567 1568 /* 1569 * We can do all the commands at once. hooray for sanity 1570 */ 1571 numCommands = 0; 1572 Lst_ForEach(gn->commands, JobPrintCommand, job); 1573 1574 /* 1575 * If we didn't print out any commands to the shell script, 1576 * there's not much point in executing the shell, is there? 1577 */ 1578 if (numCommands == 0) { 1579 noExec = TRUE; 1580 } 1581 } else if (NoExecute(gn)) { 1582 /* 1583 * Not executing anything -- just print all the commands to stdout 1584 * in one fell swoop. This will still set up job->tailCmds correctly. 1585 */ 1586 if (lastNode != gn) { 1587 MESSAGE(stdout, gn); 1588 lastNode = gn; 1589 } 1590 job->cmdFILE = stdout; 1591 /* 1592 * Only print the commands if they're ok, but don't die if they're 1593 * not -- just let the user know they're bad and keep going. It 1594 * doesn't do any harm in this case and may do some good. 1595 */ 1596 if (cmdsOK) { 1597 Lst_ForEach(gn->commands, JobPrintCommand, job); 1598 } 1599 /* 1600 * Don't execute the shell, thank you. 1601 */ 1602 noExec = TRUE; 1603 } else { 1604 /* 1605 * Just touch the target and note that no shell should be executed. 1606 * Set cmdFILE to stdout to make life easier. Check the commands, too, 1607 * but don't die if they're no good -- it does no harm to keep working 1608 * up the graph. 1609 */ 1610 job->cmdFILE = stdout; 1611 Job_Touch(gn, job->flags&JOB_SILENT); 1612 noExec = TRUE; 1613 } 1614 /* Just in case it isn't already... */ 1615 (void)fflush(job->cmdFILE); 1616 1617 /* 1618 * If we're not supposed to execute a shell, don't. 1619 */ 1620 if (noExec) { 1621 if (!(job->flags & JOB_SPECIAL)) 1622 Job_TokenReturn(); 1623 /* 1624 * Unlink and close the command file if we opened one 1625 */ 1626 if (job->cmdFILE != stdout) { 1627 if (job->cmdFILE != NULL) { 1628 (void)fclose(job->cmdFILE); 1629 job->cmdFILE = NULL; 1630 } 1631 } 1632 1633 /* 1634 * We only want to work our way up the graph if we aren't here because 1635 * the commands for the job were no good. 1636 */ 1637 if (cmdsOK && aborting == 0) { 1638 if (job->tailCmds != NILLNODE) { 1639 Lst_ForEachFrom(job->node->commands, job->tailCmds, 1640 JobSaveCommand, 1641 job->node); 1642 } 1643 job->node->made = MADE; 1644 Make_Update(job->node); 1645 } 1646 job->job_state = JOB_ST_FREE; 1647 return cmdsOK ? JOB_FINISHED : JOB_ERROR; 1648 } 1649 1650 /* 1651 * Set up the control arguments to the shell. This is based on the flags 1652 * set earlier for this job. 1653 */ 1654 JobMakeArgv(job, argv); 1655 1656 /* Create the pipe by which we'll get the shell's output. */ 1657 JobCreatePipe(job, 3); 1658 1659 JobExec(job, argv); 1660 return(JOB_RUNNING); 1661 } 1662 1663 static char * 1664 JobOutput(Job *job, char *cp, char *endp, int msg) 1665 { 1666 char *ecp; 1667 1668 if (commandShell->noPrint) { 1669 ecp = Str_FindSubstring(cp, commandShell->noPrint); 1670 while (ecp != NULL) { 1671 if (cp != ecp) { 1672 *ecp = '\0'; 1673 if (!beSilent && msg && job->node != lastNode) { 1674 MESSAGE(stdout, job->node); 1675 lastNode = job->node; 1676 } 1677 /* 1678 * The only way there wouldn't be a newline after 1679 * this line is if it were the last in the buffer. 1680 * however, since the non-printable comes after it, 1681 * there must be a newline, so we don't print one. 1682 */ 1683 (void)fprintf(stdout, "%s", cp); 1684 (void)fflush(stdout); 1685 } 1686 cp = ecp + commandShell->noPLen; 1687 if (cp != endp) { 1688 /* 1689 * Still more to print, look again after skipping 1690 * the whitespace following the non-printable 1691 * command.... 1692 */ 1693 cp++; 1694 while (*cp == ' ' || *cp == '\t' || *cp == '\n') { 1695 cp++; 1696 } 1697 ecp = Str_FindSubstring(cp, commandShell->noPrint); 1698 } else { 1699 return cp; 1700 } 1701 } 1702 } 1703 return cp; 1704 } 1705 1706 /*- 1707 *----------------------------------------------------------------------- 1708 * JobDoOutput -- 1709 * This function is called at different times depending on 1710 * whether the user has specified that output is to be collected 1711 * via pipes or temporary files. In the former case, we are called 1712 * whenever there is something to read on the pipe. We collect more 1713 * output from the given job and store it in the job's outBuf. If 1714 * this makes up a line, we print it tagged by the job's identifier, 1715 * as necessary. 1716 * If output has been collected in a temporary file, we open the 1717 * file and read it line by line, transfering it to our own 1718 * output channel until the file is empty. At which point we 1719 * remove the temporary file. 1720 * In both cases, however, we keep our figurative eye out for the 1721 * 'noPrint' line for the shell from which the output came. If 1722 * we recognize a line, we don't print it. If the command is not 1723 * alone on the line (the character after it is not \0 or \n), we 1724 * do print whatever follows it. 1725 * 1726 * Input: 1727 * job the job whose output needs printing 1728 * finish TRUE if this is the last time we'll be called 1729 * for this job 1730 * 1731 * Results: 1732 * None 1733 * 1734 * Side Effects: 1735 * curPos may be shifted as may the contents of outBuf. 1736 *----------------------------------------------------------------------- 1737 */ 1738 STATIC void 1739 JobDoOutput(Job *job, Boolean finish) 1740 { 1741 Boolean gotNL = FALSE; /* true if got a newline */ 1742 Boolean fbuf; /* true if our buffer filled up */ 1743 int nr; /* number of bytes read */ 1744 int i; /* auxiliary index into outBuf */ 1745 int max; /* limit for i (end of current data) */ 1746 int nRead; /* (Temporary) number of bytes read */ 1747 1748 /* 1749 * Read as many bytes as will fit in the buffer. 1750 */ 1751 end_loop: 1752 gotNL = FALSE; 1753 fbuf = FALSE; 1754 1755 nRead = read(job->inPipe, &job->outBuf[job->curPos], 1756 JOB_BUFSIZE - job->curPos); 1757 if (nRead < 0) { 1758 if (errno == EAGAIN) 1759 return; 1760 if (DEBUG(JOB)) { 1761 perror("JobDoOutput(piperead)"); 1762 } 1763 nr = 0; 1764 } else { 1765 nr = nRead; 1766 } 1767 1768 /* 1769 * If we hit the end-of-file (the job is dead), we must flush its 1770 * remaining output, so pretend we read a newline if there's any 1771 * output remaining in the buffer. 1772 * Also clear the 'finish' flag so we stop looping. 1773 */ 1774 if ((nr == 0) && (job->curPos != 0)) { 1775 job->outBuf[job->curPos] = '\n'; 1776 nr = 1; 1777 finish = FALSE; 1778 } else if (nr == 0) { 1779 finish = FALSE; 1780 } 1781 1782 /* 1783 * Look for the last newline in the bytes we just got. If there is 1784 * one, break out of the loop with 'i' as its index and gotNL set 1785 * TRUE. 1786 */ 1787 max = job->curPos + nr; 1788 for (i = job->curPos + nr - 1; i >= job->curPos; i--) { 1789 if (job->outBuf[i] == '\n') { 1790 gotNL = TRUE; 1791 break; 1792 } else if (job->outBuf[i] == '\0') { 1793 /* 1794 * Why? 1795 */ 1796 job->outBuf[i] = ' '; 1797 } 1798 } 1799 1800 if (!gotNL) { 1801 job->curPos += nr; 1802 if (job->curPos == JOB_BUFSIZE) { 1803 /* 1804 * If we've run out of buffer space, we have no choice 1805 * but to print the stuff. sigh. 1806 */ 1807 fbuf = TRUE; 1808 i = job->curPos; 1809 } 1810 } 1811 if (gotNL || fbuf) { 1812 /* 1813 * Need to send the output to the screen. Null terminate it 1814 * first, overwriting the newline character if there was one. 1815 * So long as the line isn't one we should filter (according 1816 * to the shell description), we print the line, preceded 1817 * by a target banner if this target isn't the same as the 1818 * one for which we last printed something. 1819 * The rest of the data in the buffer are then shifted down 1820 * to the start of the buffer and curPos is set accordingly. 1821 */ 1822 job->outBuf[i] = '\0'; 1823 if (i >= job->curPos) { 1824 char *cp; 1825 1826 cp = JobOutput(job, job->outBuf, &job->outBuf[i], FALSE); 1827 1828 /* 1829 * There's still more in that thar buffer. This time, though, 1830 * we know there's no newline at the end, so we add one of 1831 * our own free will. 1832 */ 1833 if (*cp != '\0') { 1834 if (!beSilent && job->node != lastNode) { 1835 MESSAGE(stdout, job->node); 1836 lastNode = job->node; 1837 } 1838 (void)fprintf(stdout, "%s%s", cp, gotNL ? "\n" : ""); 1839 (void)fflush(stdout); 1840 } 1841 } 1842 if (i < max - 1) { 1843 /* shift the remaining characters down */ 1844 (void)memcpy(job->outBuf, &job->outBuf[i + 1], max - (i + 1)); 1845 job->curPos = max - (i + 1); 1846 1847 } else { 1848 /* 1849 * We have written everything out, so we just start over 1850 * from the start of the buffer. No copying. No nothing. 1851 */ 1852 job->curPos = 0; 1853 } 1854 } 1855 if (finish) { 1856 /* 1857 * If the finish flag is true, we must loop until we hit 1858 * end-of-file on the pipe. This is guaranteed to happen 1859 * eventually since the other end of the pipe is now closed 1860 * (we closed it explicitly and the child has exited). When 1861 * we do get an EOF, finish will be set FALSE and we'll fall 1862 * through and out. 1863 */ 1864 goto end_loop; 1865 } 1866 } 1867 1868 static void 1869 JobRun(GNode *targ) 1870 { 1871 #ifdef notyet 1872 /* 1873 * Unfortunately it is too complicated to run .BEGIN, .END, 1874 * and .INTERRUPT job in the parallel job module. This has 1875 * the nice side effect that it avoids a lot of other problems. 1876 */ 1877 Lst lst = Lst_Init(FALSE); 1878 Lst_AtEnd(lst, targ); 1879 (void)Make_Run(lst); 1880 Lst_Destroy(lst, NOFREE); 1881 JobStart(targ, JOB_SPECIAL); 1882 while (jobTokensRunning) { 1883 Job_CatchOutput(); 1884 } 1885 #else 1886 Compat_Make(targ, targ); 1887 if (targ->made == ERROR) { 1888 PrintOnError("\n\nStop."); 1889 exit(1); 1890 } 1891 #endif 1892 } 1893 1894 /*- 1895 *----------------------------------------------------------------------- 1896 * Job_CatchChildren -- 1897 * Handle the exit of a child. Called from Make_Make. 1898 * 1899 * Input: 1900 * block TRUE if should block on the wait 1901 * 1902 * Results: 1903 * none. 1904 * 1905 * Side Effects: 1906 * The job descriptor is removed from the list of children. 1907 * 1908 * Notes: 1909 * We do waits, blocking or not, according to the wisdom of our 1910 * caller, until there are no more children to report. For each 1911 * job, call JobFinish to finish things off. 1912 * 1913 *----------------------------------------------------------------------- 1914 */ 1915 1916 void 1917 Job_CatchChildren(void) 1918 { 1919 int pid; /* pid of dead child */ 1920 Job *job; /* job descriptor for dead child */ 1921 int status; /* Exit/termination status */ 1922 1923 /* 1924 * Don't even bother if we know there's no one around. 1925 */ 1926 if (jobTokensRunning == 0) 1927 return; 1928 1929 while ((pid = waitpid((pid_t) -1, &status, WNOHANG | WUNTRACED)) > 0) { 1930 if (DEBUG(JOB)) { 1931 (void)fprintf(debug_file, "Process %d exited/stopped status %x.\n", pid, 1932 status); 1933 } 1934 1935 job = JobFindPid(pid, JOB_ST_RUNNING); 1936 if (job == NULL) { 1937 if (!lurking_children) 1938 Error("Child (%d) status %x not in table?", pid, status); 1939 continue; 1940 } 1941 if (WIFSTOPPED(status)) { 1942 if (DEBUG(JOB)) { 1943 (void)fprintf(debug_file, "Process %d (%s) stopped.\n", 1944 job->pid, job->node->name); 1945 } 1946 if (!make_suspended) { 1947 switch (WSTOPSIG(status)) { 1948 case SIGTSTP: 1949 (void)printf("*** [%s] Suspended\n", job->node->name); 1950 break; 1951 case SIGSTOP: 1952 (void)printf("*** [%s] Stopped\n", job->node->name); 1953 break; 1954 default: 1955 (void)printf("*** [%s] Stopped -- signal %d\n", 1956 job->node->name, WSTOPSIG(status)); 1957 } 1958 job->job_suspended = 1; 1959 } 1960 (void)fflush(stdout); 1961 continue; 1962 } 1963 1964 job->job_state = JOB_ST_FINISHED; 1965 job->exit_status = status; 1966 1967 JobFinish(job, status); 1968 } 1969 } 1970 1971 /*- 1972 *----------------------------------------------------------------------- 1973 * Job_CatchOutput -- 1974 * Catch the output from our children, if we're using 1975 * pipes do so. Otherwise just block time until we get a 1976 * signal(most likely a SIGCHLD) since there's no point in 1977 * just spinning when there's nothing to do and the reaping 1978 * of a child can wait for a while. 1979 * 1980 * Results: 1981 * None 1982 * 1983 * Side Effects: 1984 * Output is read from pipes if we're piping. 1985 * ----------------------------------------------------------------------- 1986 */ 1987 void 1988 Job_CatchOutput(void) 1989 { 1990 int nready; 1991 Job *job; 1992 int i; 1993 1994 (void)fflush(stdout); 1995 1996 /* The first fd in the list is the job token pipe */ 1997 nready = poll(fds + 1 - wantToken, nfds - 1 + wantToken, POLL_MSEC); 1998 1999 if (nready < 0 || readyfd(&childExitJob)) { 2000 char token = 0; 2001 nready -= 1; 2002 (void)read(childExitJob.inPipe, &token, 1); 2003 if (token == DO_JOB_RESUME[0]) 2004 /* Complete relay requested from our SIGCONT handler */ 2005 JobRestartJobs(); 2006 Job_CatchChildren(); 2007 } 2008 2009 if (nready <= 0) 2010 return; 2011 2012 if (wantToken && readyfd(&tokenWaitJob)) 2013 nready--; 2014 2015 for (i = 2; i < nfds; i++) { 2016 if (!fds[i].revents) 2017 continue; 2018 job = jobfds[i]; 2019 if (job->job_state != JOB_ST_RUNNING) 2020 continue; 2021 JobDoOutput(job, FALSE); 2022 } 2023 } 2024 2025 /*- 2026 *----------------------------------------------------------------------- 2027 * Job_Make -- 2028 * Start the creation of a target. Basically a front-end for 2029 * JobStart used by the Make module. 2030 * 2031 * Results: 2032 * None. 2033 * 2034 * Side Effects: 2035 * Another job is started. 2036 * 2037 *----------------------------------------------------------------------- 2038 */ 2039 void 2040 Job_Make(GNode *gn) 2041 { 2042 (void)JobStart(gn, 0); 2043 } 2044 2045 void 2046 Shell_Init(void) 2047 { 2048 if (shellPath == NULL) { 2049 /* 2050 * We are using the default shell, which may be an absolute 2051 * path if DEFSHELL_CUSTOM is defined. 2052 */ 2053 shellName = commandShell->name; 2054 #ifdef DEFSHELL_CUSTOM 2055 if (*shellName == '/') { 2056 shellPath = shellName; 2057 shellName = strrchr(shellPath, '/'); 2058 shellName++; 2059 } else 2060 #endif 2061 shellPath = str_concat(_PATH_DEFSHELLDIR, shellName, STR_ADDSLASH); 2062 } 2063 if (commandShell->exit == NULL) { 2064 commandShell->exit = ""; 2065 } 2066 if (commandShell->echo == NULL) { 2067 commandShell->echo = ""; 2068 } 2069 } 2070 2071 /*- 2072 * Returns the string literal that is used in the current command shell 2073 * to produce a newline character. 2074 */ 2075 const char * 2076 Shell_GetNewline(void) 2077 { 2078 2079 return commandShell->newline; 2080 } 2081 2082 void 2083 Job_SetPrefix(void) 2084 { 2085 2086 if (targPrefix) { 2087 free(targPrefix); 2088 } else if (!Var_Exists(MAKE_JOB_PREFIX, VAR_GLOBAL)) { 2089 Var_Set(MAKE_JOB_PREFIX, "---", VAR_GLOBAL, 0); 2090 } 2091 2092 targPrefix = Var_Subst(NULL, "${" MAKE_JOB_PREFIX "}", VAR_GLOBAL, 0); 2093 } 2094 2095 /*- 2096 *----------------------------------------------------------------------- 2097 * Job_Init -- 2098 * Initialize the process module 2099 * 2100 * Input: 2101 * 2102 * Results: 2103 * none 2104 * 2105 * Side Effects: 2106 * lists and counters are initialized 2107 *----------------------------------------------------------------------- 2108 */ 2109 void 2110 Job_Init(void) 2111 { 2112 GNode *begin; /* node for commands to do at the very start */ 2113 2114 /* Allocate space for all the job info */ 2115 job_table = emalloc(maxJobs * sizeof *job_table); 2116 memset(job_table, 0, maxJobs * sizeof *job_table); 2117 job_table_end = job_table + maxJobs; 2118 wantToken = 0; 2119 2120 aborting = 0; 2121 errors = 0; 2122 2123 lastNode = NILGNODE; 2124 2125 if (maxJobs == 1) { 2126 /* 2127 * If only one job can run at a time, there's no need for a banner, 2128 * is there? 2129 */ 2130 targFmt = ""; 2131 } else { 2132 targFmt = TARG_FMT; 2133 } 2134 2135 /* 2136 * There is a non-zero chance that we already have children. 2137 * eg after 'make -f- <<EOF' 2138 * Since their termination causes a 'Child (pid) not in table' message, 2139 * Collect the status of any that are already dead, and suppress the 2140 * error message if there are any undead ones. 2141 */ 2142 for (;;) { 2143 int rval, status; 2144 rval = waitpid((pid_t) -1, &status, WNOHANG); 2145 if (rval > 0) 2146 continue; 2147 if (rval == 0) 2148 lurking_children = 1; 2149 break; 2150 } 2151 2152 Shell_Init(); 2153 2154 JobCreatePipe(&childExitJob, 3); 2155 2156 /* We can only need to wait for tokens, children and output from each job */ 2157 fds = emalloc(sizeof (*fds) * (2 + maxJobs)); 2158 jobfds = emalloc(sizeof (*jobfds) * (2 + maxJobs)); 2159 2160 /* These are permanent entries and take slots 0 and 1 */ 2161 watchfd(&tokenWaitJob); 2162 watchfd(&childExitJob); 2163 2164 sigemptyset(&caught_signals); 2165 /* 2166 * Install a SIGCHLD handler. 2167 */ 2168 (void)signal(SIGCHLD, JobChildSig); 2169 sigaddset(&caught_signals, SIGCHLD); 2170 2171 #define ADDSIG(s,h) \ 2172 if (signal(s, SIG_IGN) != SIG_IGN) { \ 2173 sigaddset(&caught_signals, s); \ 2174 (void)signal(s, h); \ 2175 } 2176 2177 /* 2178 * Catch the four signals that POSIX specifies if they aren't ignored. 2179 * JobPassSig will take care of calling JobInterrupt if appropriate. 2180 */ 2181 ADDSIG(SIGINT, JobPassSig_int) 2182 ADDSIG(SIGHUP, JobPassSig_term) 2183 ADDSIG(SIGTERM, JobPassSig_term) 2184 ADDSIG(SIGQUIT, JobPassSig_term) 2185 2186 /* 2187 * There are additional signals that need to be caught and passed if 2188 * either the export system wants to be told directly of signals or if 2189 * we're giving each job its own process group (since then it won't get 2190 * signals from the terminal driver as we own the terminal) 2191 */ 2192 ADDSIG(SIGTSTP, JobPassSig_suspend) 2193 ADDSIG(SIGTTOU, JobPassSig_suspend) 2194 ADDSIG(SIGTTIN, JobPassSig_suspend) 2195 ADDSIG(SIGWINCH, JobCondPassSig) 2196 ADDSIG(SIGCONT, JobContinueSig) 2197 #undef ADDSIG 2198 2199 begin = Targ_FindNode(".BEGIN", TARG_NOCREATE); 2200 2201 if (begin != NILGNODE) { 2202 JobRun(begin); 2203 if (begin->made == ERROR) { 2204 PrintOnError("\n\nStop."); 2205 exit(1); 2206 } 2207 } 2208 postCommands = Targ_FindNode(".END", TARG_CREATE); 2209 } 2210 2211 static void JobSigReset(void) 2212 { 2213 #define DELSIG(s) \ 2214 if (sigismember(&caught_signals, s)) { \ 2215 (void)signal(s, SIG_DFL); \ 2216 } 2217 2218 DELSIG(SIGINT) 2219 DELSIG(SIGHUP) 2220 DELSIG(SIGQUIT) 2221 DELSIG(SIGTERM) 2222 DELSIG(SIGTSTP) 2223 DELSIG(SIGTTOU) 2224 DELSIG(SIGTTIN) 2225 DELSIG(SIGWINCH) 2226 DELSIG(SIGCONT) 2227 #undef DELSIG 2228 (void)signal(SIGCHLD, SIG_DFL); 2229 } 2230 2231 /*- 2232 *----------------------------------------------------------------------- 2233 * JobMatchShell -- 2234 * Find a shell in 'shells' given its name. 2235 * 2236 * Results: 2237 * A pointer to the Shell structure. 2238 * 2239 * Side Effects: 2240 * None. 2241 * 2242 *----------------------------------------------------------------------- 2243 */ 2244 static Shell * 2245 JobMatchShell(const char *name) 2246 { 2247 Shell *sh; 2248 2249 for (sh = shells; sh->name != NULL; sh++) { 2250 if (strcmp(name, sh->name) == 0) 2251 return (sh); 2252 } 2253 return (NULL); 2254 } 2255 2256 /*- 2257 *----------------------------------------------------------------------- 2258 * Job_ParseShell -- 2259 * Parse a shell specification and set up commandShell, shellPath 2260 * and shellName appropriately. 2261 * 2262 * Input: 2263 * line The shell spec 2264 * 2265 * Results: 2266 * FAILURE if the specification was incorrect. 2267 * 2268 * Side Effects: 2269 * commandShell points to a Shell structure (either predefined or 2270 * created from the shell spec), shellPath is the full path of the 2271 * shell described by commandShell, while shellName is just the 2272 * final component of shellPath. 2273 * 2274 * Notes: 2275 * A shell specification consists of a .SHELL target, with dependency 2276 * operator, followed by a series of blank-separated words. Double 2277 * quotes can be used to use blanks in words. A backslash escapes 2278 * anything (most notably a double-quote and a space) and 2279 * provides the functionality it does in C. Each word consists of 2280 * keyword and value separated by an equal sign. There should be no 2281 * unnecessary spaces in the word. The keywords are as follows: 2282 * name Name of shell. 2283 * path Location of shell. 2284 * quiet Command to turn off echoing. 2285 * echo Command to turn echoing on 2286 * filter Result of turning off echoing that shouldn't be 2287 * printed. 2288 * echoFlag Flag to turn echoing on at the start 2289 * errFlag Flag to turn error checking on at the start 2290 * hasErrCtl True if shell has error checking control 2291 * newline String literal to represent a newline char 2292 * check Command to turn on error checking if hasErrCtl 2293 * is TRUE or template of command to echo a command 2294 * for which error checking is off if hasErrCtl is 2295 * FALSE. 2296 * ignore Command to turn off error checking if hasErrCtl 2297 * is TRUE or template of command to execute a 2298 * command so as to ignore any errors it returns if 2299 * hasErrCtl is FALSE. 2300 * 2301 *----------------------------------------------------------------------- 2302 */ 2303 ReturnStatus 2304 Job_ParseShell(char *line) 2305 { 2306 char **words; 2307 char **argv; 2308 int argc; 2309 char *path; 2310 Shell newShell; 2311 Boolean fullSpec = FALSE; 2312 Shell *sh; 2313 2314 while (isspace((unsigned char)*line)) { 2315 line++; 2316 } 2317 2318 if (shellArgv) 2319 free(UNCONST(shellArgv)); 2320 2321 memset(&newShell, 0, sizeof(newShell)); 2322 2323 /* 2324 * Parse the specification by keyword 2325 */ 2326 words = brk_string(line, &argc, TRUE, &path); 2327 shellArgv = path; 2328 2329 for (path = NULL, argv = words; argc != 0; argc--, argv++) { 2330 if (strncmp(*argv, "path=", 5) == 0) { 2331 path = &argv[0][5]; 2332 } else if (strncmp(*argv, "name=", 5) == 0) { 2333 newShell.name = &argv[0][5]; 2334 } else { 2335 if (strncmp(*argv, "quiet=", 6) == 0) { 2336 newShell.echoOff = &argv[0][6]; 2337 } else if (strncmp(*argv, "echo=", 5) == 0) { 2338 newShell.echoOn = &argv[0][5]; 2339 } else if (strncmp(*argv, "filter=", 7) == 0) { 2340 newShell.noPrint = &argv[0][7]; 2341 newShell.noPLen = strlen(newShell.noPrint); 2342 } else if (strncmp(*argv, "echoFlag=", 9) == 0) { 2343 newShell.echo = &argv[0][9]; 2344 } else if (strncmp(*argv, "errFlag=", 8) == 0) { 2345 newShell.exit = &argv[0][8]; 2346 } else if (strncmp(*argv, "hasErrCtl=", 10) == 0) { 2347 char c = argv[0][10]; 2348 newShell.hasErrCtl = !((c != 'Y') && (c != 'y') && 2349 (c != 'T') && (c != 't')); 2350 } else if (strncmp(*argv, "newline=", 8) == 0) { 2351 newShell.newline = &argv[0][8]; 2352 } else if (strncmp(*argv, "check=", 6) == 0) { 2353 newShell.errCheck = &argv[0][6]; 2354 } else if (strncmp(*argv, "ignore=", 7) == 0) { 2355 newShell.ignErr = &argv[0][7]; 2356 } else if (strncmp(*argv, "errout=", 7) == 0) { 2357 newShell.errOut = &argv[0][7]; 2358 } else if (strncmp(*argv, "comment=", 8) == 0) { 2359 newShell.commentChar = argv[0][8]; 2360 } else { 2361 Parse_Error(PARSE_FATAL, "Unknown keyword \"%s\"", 2362 *argv); 2363 free(words); 2364 return(FAILURE); 2365 } 2366 fullSpec = TRUE; 2367 } 2368 } 2369 2370 if (path == NULL) { 2371 /* 2372 * If no path was given, the user wants one of the pre-defined shells, 2373 * yes? So we find the one s/he wants with the help of JobMatchShell 2374 * and set things up the right way. shellPath will be set up by 2375 * Job_Init. 2376 */ 2377 if (newShell.name == NULL) { 2378 Parse_Error(PARSE_FATAL, "Neither path nor name specified"); 2379 free(words); 2380 return(FAILURE); 2381 } else { 2382 if ((sh = JobMatchShell(newShell.name)) == NULL) { 2383 Parse_Error(PARSE_WARNING, "%s: No matching shell", 2384 newShell.name); 2385 free(words); 2386 return(FAILURE); 2387 } 2388 commandShell = sh; 2389 shellName = newShell.name; 2390 } 2391 } else { 2392 /* 2393 * The user provided a path. If s/he gave nothing else (fullSpec is 2394 * FALSE), try and find a matching shell in the ones we know of. 2395 * Else we just take the specification at its word and copy it 2396 * to a new location. In either case, we need to record the 2397 * path the user gave for the shell. 2398 */ 2399 shellPath = path; 2400 path = strrchr(path, '/'); 2401 if (path == NULL) { 2402 path = UNCONST(shellPath); 2403 } else { 2404 path += 1; 2405 } 2406 if (newShell.name != NULL) { 2407 shellName = newShell.name; 2408 } else { 2409 shellName = path; 2410 } 2411 if (!fullSpec) { 2412 if ((sh = JobMatchShell(shellName)) == NULL) { 2413 Parse_Error(PARSE_WARNING, "%s: No matching shell", 2414 shellName); 2415 free(words); 2416 return(FAILURE); 2417 } 2418 commandShell = sh; 2419 } else { 2420 commandShell = emalloc(sizeof(Shell)); 2421 *commandShell = newShell; 2422 } 2423 } 2424 2425 if (commandShell->echoOn && commandShell->echoOff) { 2426 commandShell->hasEchoCtl = TRUE; 2427 } 2428 2429 if (!commandShell->hasErrCtl) { 2430 if (commandShell->errCheck == NULL) { 2431 commandShell->errCheck = ""; 2432 } 2433 if (commandShell->ignErr == NULL) { 2434 commandShell->ignErr = "%s\n"; 2435 } 2436 } 2437 2438 /* 2439 * Do not free up the words themselves, since they might be in use by the 2440 * shell specification. 2441 */ 2442 free(words); 2443 return SUCCESS; 2444 } 2445 2446 /*- 2447 *----------------------------------------------------------------------- 2448 * JobInterrupt -- 2449 * Handle the receipt of an interrupt. 2450 * 2451 * Input: 2452 * runINTERRUPT Non-zero if commands for the .INTERRUPT target 2453 * should be executed 2454 * signo signal received 2455 * 2456 * Results: 2457 * None 2458 * 2459 * Side Effects: 2460 * All children are killed. Another job will be started if the 2461 * .INTERRUPT target was given. 2462 *----------------------------------------------------------------------- 2463 */ 2464 static void 2465 JobInterrupt(int runINTERRUPT, int signo) 2466 { 2467 Job *job; /* job descriptor in that element */ 2468 GNode *interrupt; /* the node describing the .INTERRUPT target */ 2469 sigset_t mask; 2470 GNode *gn; 2471 2472 aborting = ABORT_INTERRUPT; 2473 2474 JobSigLock(&mask); 2475 2476 for (job = job_table; job < job_table_end; job++) { 2477 if (job->job_state != JOB_ST_RUNNING) 2478 continue; 2479 2480 gn = job->node; 2481 2482 if ((gn->type & (OP_JOIN|OP_PHONY)) == 0 && !Targ_Precious(gn)) { 2483 char *file = (gn->path == NULL ? gn->name : gn->path); 2484 if (!noExecute && eunlink(file) != -1) { 2485 Error("*** %s removed", file); 2486 } 2487 } 2488 if (job->pid) { 2489 if (DEBUG(JOB)) { 2490 (void)fprintf(debug_file, 2491 "JobInterrupt passing signal %d to child %d.\n", 2492 signo, job->pid); 2493 } 2494 KILLPG(job->pid, signo); 2495 } 2496 } 2497 2498 JobSigUnlock(&mask); 2499 2500 if (runINTERRUPT && !touchFlag) { 2501 interrupt = Targ_FindNode(".INTERRUPT", TARG_NOCREATE); 2502 if (interrupt != NILGNODE) { 2503 ignoreErrors = FALSE; 2504 JobRun(interrupt); 2505 } 2506 } 2507 Trace_Log(MAKEINTR, 0); 2508 exit(signo); 2509 } 2510 2511 /* 2512 *----------------------------------------------------------------------- 2513 * Job_Finish -- 2514 * Do final processing such as the running of the commands 2515 * attached to the .END target. 2516 * 2517 * Results: 2518 * Number of errors reported. 2519 * 2520 * Side Effects: 2521 * None. 2522 *----------------------------------------------------------------------- 2523 */ 2524 int 2525 Job_Finish(void) 2526 { 2527 if (postCommands != NILGNODE && !Lst_IsEmpty(postCommands->commands)) { 2528 if (errors) { 2529 Error("Errors reported so .END ignored"); 2530 } else { 2531 JobRun(postCommands); 2532 } 2533 } 2534 return(errors); 2535 } 2536 2537 /*- 2538 *----------------------------------------------------------------------- 2539 * Job_End -- 2540 * Cleanup any memory used by the jobs module 2541 * 2542 * Results: 2543 * None. 2544 * 2545 * Side Effects: 2546 * Memory is freed 2547 *----------------------------------------------------------------------- 2548 */ 2549 void 2550 Job_End(void) 2551 { 2552 #ifdef CLEANUP 2553 if (shellArgv) 2554 free(shellArgv); 2555 #endif 2556 } 2557 2558 /*- 2559 *----------------------------------------------------------------------- 2560 * Job_Wait -- 2561 * Waits for all running jobs to finish and returns. Sets 'aborting' 2562 * to ABORT_WAIT to prevent other jobs from starting. 2563 * 2564 * Results: 2565 * None. 2566 * 2567 * Side Effects: 2568 * Currently running jobs finish. 2569 * 2570 *----------------------------------------------------------------------- 2571 */ 2572 void 2573 Job_Wait(void) 2574 { 2575 aborting = ABORT_WAIT; 2576 while (jobTokensRunning != 0) { 2577 Job_CatchOutput(); 2578 } 2579 aborting = 0; 2580 } 2581 2582 /*- 2583 *----------------------------------------------------------------------- 2584 * Job_AbortAll -- 2585 * Abort all currently running jobs without handling output or anything. 2586 * This function is to be called only in the event of a major 2587 * error. Most definitely NOT to be called from JobInterrupt. 2588 * 2589 * Results: 2590 * None 2591 * 2592 * Side Effects: 2593 * All children are killed, not just the firstborn 2594 *----------------------------------------------------------------------- 2595 */ 2596 void 2597 Job_AbortAll(void) 2598 { 2599 Job *job; /* the job descriptor in that element */ 2600 int foo; 2601 2602 aborting = ABORT_ERROR; 2603 2604 if (jobTokensRunning) { 2605 for (job = job_table; job < job_table_end; job++) { 2606 if (job->job_state != JOB_ST_RUNNING) 2607 continue; 2608 /* 2609 * kill the child process with increasingly drastic signals to make 2610 * darn sure it's dead. 2611 */ 2612 KILLPG(job->pid, SIGINT); 2613 KILLPG(job->pid, SIGKILL); 2614 } 2615 } 2616 2617 /* 2618 * Catch as many children as want to report in at first, then give up 2619 */ 2620 while (waitpid((pid_t) -1, &foo, WNOHANG) > 0) 2621 continue; 2622 } 2623 2624 2625 /*- 2626 *----------------------------------------------------------------------- 2627 * JobRestartJobs -- 2628 * Tries to restart stopped jobs if there are slots available. 2629 * Called in process context in response to a SIGCONT. 2630 * 2631 * Results: 2632 * None. 2633 * 2634 * Side Effects: 2635 * Resumes jobs. 2636 * 2637 *----------------------------------------------------------------------- 2638 */ 2639 static void 2640 JobRestartJobs(void) 2641 { 2642 Job *job; 2643 2644 for (job = job_table; job < job_table_end; job++) { 2645 if (job->job_state == JOB_ST_RUNNING && 2646 (make_suspended || job->job_suspended)) { 2647 if (DEBUG(JOB)) { 2648 (void)fprintf(debug_file, "Restarting stopped job pid %d.\n", 2649 job->pid); 2650 } 2651 if (job->job_suspended) { 2652 (void)printf("*** [%s] Continued\n", job->node->name); 2653 (void)fflush(stdout); 2654 } 2655 job->job_suspended = 0; 2656 if (KILLPG(job->pid, SIGCONT) != 0 && DEBUG(JOB)) { 2657 fprintf(debug_file, "Failed to send SIGCONT to %d\n", job->pid); 2658 } 2659 } 2660 if (job->job_state == JOB_ST_FINISHED) 2661 /* Job exit deferred after calling waitpid() in a signal handler */ 2662 JobFinish(job, job->exit_status); 2663 } 2664 make_suspended = 0; 2665 } 2666 2667 static void 2668 watchfd(Job *job) 2669 { 2670 if (job->inPollfd != NULL) 2671 Punt("Watching watched job"); 2672 2673 fds[nfds].fd = job->inPipe; 2674 fds[nfds].events = POLLIN; 2675 jobfds[nfds] = job; 2676 job->inPollfd = &fds[nfds]; 2677 nfds++; 2678 } 2679 2680 static void 2681 clearfd(Job *job) 2682 { 2683 int i; 2684 if (job->inPollfd == NULL) 2685 Punt("Unwatching unwatched job"); 2686 i = job->inPollfd - fds; 2687 nfds--; 2688 /* 2689 * Move last job in table into hole made by dead job. 2690 */ 2691 if (nfds != i) { 2692 fds[i] = fds[nfds]; 2693 jobfds[i] = jobfds[nfds]; 2694 jobfds[i]->inPollfd = &fds[i]; 2695 } 2696 job->inPollfd = NULL; 2697 } 2698 2699 static int 2700 readyfd(Job *job) 2701 { 2702 if (job->inPollfd == NULL) 2703 Punt("Polling unwatched job"); 2704 return (job->inPollfd->revents & POLLIN) != 0; 2705 } 2706 2707 /*- 2708 *----------------------------------------------------------------------- 2709 * JobTokenAdd -- 2710 * Put a token into the job pipe so that some make process can start 2711 * another job. 2712 * 2713 * Side Effects: 2714 * Allows more build jobs to be spawned somewhere. 2715 * 2716 *----------------------------------------------------------------------- 2717 */ 2718 2719 static void 2720 JobTokenAdd(void) 2721 { 2722 char tok = JOB_TOKENS[aborting], tok1; 2723 2724 /* If we are depositing an error token flush everything else */ 2725 while (tok != '+' && read(tokenWaitJob.inPipe, &tok1, 1) == 1) 2726 continue; 2727 2728 if (DEBUG(JOB)) 2729 fprintf(debug_file, "(%d) aborting %d, deposit token %c\n", 2730 getpid(), aborting, JOB_TOKENS[aborting]); 2731 write(tokenWaitJob.outPipe, &tok, 1); 2732 } 2733 2734 /*- 2735 *----------------------------------------------------------------------- 2736 * Job_ServerStartTokenAdd -- 2737 * Prep the job token pipe in the root make process. 2738 * 2739 *----------------------------------------------------------------------- 2740 */ 2741 2742 void 2743 Job_ServerStart(int max_tokens, int jp_0, int jp_1) 2744 { 2745 int i; 2746 char jobarg[64]; 2747 2748 if (jp_0 >= 0 && jp_1 >= 0) { 2749 /* Pipe passed in from parent */ 2750 tokenWaitJob.inPipe = jp_0; 2751 tokenWaitJob.outPipe = jp_1; 2752 return; 2753 } 2754 2755 JobCreatePipe(&tokenWaitJob, 15); 2756 2757 snprintf(jobarg, sizeof(jobarg), "%d,%d", 2758 tokenWaitJob.inPipe, tokenWaitJob.outPipe); 2759 2760 Var_Append(MAKEFLAGS, "-J", VAR_GLOBAL); 2761 Var_Append(MAKEFLAGS, jobarg, VAR_GLOBAL); 2762 2763 /* 2764 * Preload the job pipe with one token per job, save the one 2765 * "extra" token for the primary job. 2766 * 2767 * XXX should clip maxJobs against PIPE_BUF -- if max_tokens is 2768 * larger than the write buffer size of the pipe, we will 2769 * deadlock here. 2770 */ 2771 for (i = 1; i < max_tokens; i++) 2772 JobTokenAdd(); 2773 } 2774 2775 /*- 2776 *----------------------------------------------------------------------- 2777 * Job_TokenReturn -- 2778 * Return a withdrawn token to the pool. 2779 * 2780 *----------------------------------------------------------------------- 2781 */ 2782 2783 void 2784 Job_TokenReturn(void) 2785 { 2786 jobTokensRunning--; 2787 if (jobTokensRunning < 0) 2788 Punt("token botch"); 2789 if (jobTokensRunning || JOB_TOKENS[aborting] != '+') 2790 JobTokenAdd(); 2791 } 2792 2793 /*- 2794 *----------------------------------------------------------------------- 2795 * Job_TokenWithdraw -- 2796 * Attempt to withdraw a token from the pool. 2797 * 2798 * Results: 2799 * Returns TRUE if a token was withdrawn, and FALSE if the pool 2800 * is currently empty. 2801 * 2802 * Side Effects: 2803 * If pool is empty, set wantToken so that we wake up 2804 * when a token is released. 2805 * 2806 *----------------------------------------------------------------------- 2807 */ 2808 2809 2810 Boolean 2811 Job_TokenWithdraw(void) 2812 { 2813 char tok, tok1; 2814 int count; 2815 2816 wantToken = 0; 2817 if (DEBUG(JOB)) 2818 fprintf(debug_file, "Job_TokenWithdraw(%d): aborting %d, running %d\n", 2819 getpid(), aborting, jobTokensRunning); 2820 2821 if (aborting || (jobTokensRunning >= maxJobs)) 2822 return FALSE; 2823 2824 count = read(tokenWaitJob.inPipe, &tok, 1); 2825 if (count == 0) 2826 Fatal("eof on job pipe!"); 2827 if (count < 0 && jobTokensRunning != 0) { 2828 if (errno != EAGAIN) { 2829 Fatal("job pipe read: %s", strerror(errno)); 2830 } 2831 if (DEBUG(JOB)) 2832 fprintf(debug_file, "(%d) blocked for token\n", getpid()); 2833 wantToken = 1; 2834 return FALSE; 2835 } 2836 2837 if (count == 1 && tok != '+') { 2838 /* make being abvorted - remove any other job tokens */ 2839 if (DEBUG(JOB)) 2840 fprintf(debug_file, "(%d) aborted by token %c\n", getpid(), tok); 2841 while (read(tokenWaitJob.inPipe, &tok1, 1) == 1) 2842 continue; 2843 /* And put the stopper back */ 2844 write(tokenWaitJob.outPipe, &tok, 1); 2845 Fatal("A failure has been detected in another branch of the parallel make"); 2846 } 2847 2848 if (count == 1 && jobTokensRunning == 0) 2849 /* We didn't want the token really */ 2850 write(tokenWaitJob.outPipe, &tok, 1); 2851 2852 jobTokensRunning++; 2853 if (DEBUG(JOB)) 2854 fprintf(debug_file, "(%d) withdrew token\n", getpid()); 2855 return TRUE; 2856 } 2857 2858 #ifdef USE_SELECT 2859 int 2860 emul_poll(struct pollfd *fd, int nfd, int timeout) 2861 { 2862 fd_set rfds, wfds; 2863 int i, maxfd, nselect, npoll; 2864 struct timeval tv, *tvp; 2865 long usecs; 2866 2867 FD_ZERO(&rfds); 2868 FD_ZERO(&wfds); 2869 2870 maxfd = -1; 2871 for (i = 0; i < nfd; i++) { 2872 fd[i].revents = 0; 2873 2874 if (fd[i].events & POLLIN) 2875 FD_SET(fd[i].fd, &rfds); 2876 2877 if (fd[i].events & POLLOUT) 2878 FD_SET(fd[i].fd, &wfds); 2879 2880 if (fd[i].fd > maxfd) 2881 maxfd = fd[i].fd; 2882 } 2883 2884 if (maxfd >= FD_SETSIZE) { 2885 Punt("Ran out of fd_set slots; " 2886 "recompile with a larger FD_SETSIZE."); 2887 } 2888 2889 if (timeout < 0) { 2890 tvp = NULL; 2891 } else { 2892 usecs = timeout * 1000; 2893 tv.tv_sec = usecs / 1000000; 2894 tv.tv_usec = usecs % 1000000; 2895 tvp = &tv; 2896 } 2897 2898 nselect = select(maxfd + 1, &rfds, &wfds, 0, tvp); 2899 2900 if (nselect <= 0) 2901 return nselect; 2902 2903 npoll = 0; 2904 for (i = 0; i < nfd; i++) { 2905 if (FD_ISSET(fd[i].fd, &rfds)) 2906 fd[i].revents |= POLLIN; 2907 2908 if (FD_ISSET(fd[i].fd, &wfds)) 2909 fd[i].revents |= POLLOUT; 2910 2911 if (fd[i].revents) 2912 npoll++; 2913 } 2914 2915 return npoll; 2916 } 2917 #endif /* USE_SELECT */ 2918