/* $OpenPackages$ */ /* $OpenBSD: job.c,v 1.93 2007/10/09 09:32:03 espie Exp $ */ /* $NetBSD: job.c,v 1.16 1996/11/06 17:59:08 christos Exp $ */ /* * Copyright (c) 1988, 1989, 1990 The Regents of the University of California. * Copyright (c) 1988, 1989 by Adam de Boor * Copyright (c) 1989 by Berkeley Softworks * All rights reserved. * * This code is derived from software contributed to Berkeley by * Adam de Boor. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ /*- * job.c -- * handle the creation etc. of our child processes. * * Interface: * Job_Make Start the creation of the given target. * * Job_CatchChildren Check for and handle the termination of any * children. This must be called reasonably * frequently to keep the whole make going at * a decent clip, since job table entries aren't * removed until their process is caught this way. * * Job_CatchOutput Print any output our children have produced. * Should also be called fairly frequently to * keep the user informed of what's going on. * If no output is waiting, it will block for * a time given by the SEL_* constants, below, * or until output is ready. * * Job_Init Called to initialize this module. in addition, * any commands attached to the .BEGIN target * are executed before this function returns. * Hence, the makefile must have been parsed * before this function is called. * * Job_End Cleanup any memory used. * * Job_Full Return true if the job table is filled. * * Job_Empty Return true if the job table is completely * empty. * * Job_Finish Perform any final processing which needs doing. * This includes the execution of any commands * which have been/were attached to the .END * target. It should only be called when the * job table is empty. * * Job_AbortAll Abort all currently running jobs. It doesn't * handle output or do anything for the jobs, * just kills them. It should only be called in * an emergency, as it were. * * Job_Wait Wait for all currently-running jobs to finish. */ #include #include #include #include #include #include #include #include #include #include #include #include "config.h" #include "defines.h" #include "job.h" #include "engine.h" #include "pathnames.h" #include "var.h" #include "targ.h" #include "error.h" #include "lst.h" #include "extern.h" #include "gnode.h" #include "memory.h" #include "make.h" /* * The SEL_ constants determine the maximum amount of time spent in select * before coming out to see if a child has finished. SEL_SEC is the number of * seconds and SEL_USEC is the number of micro-seconds */ #define SEL_SEC 0 #define SEL_USEC 500000 /*- * Job Table definitions. * * Each job has several things associated with it: * 1) The process id of the child shell * 2) The graph node describing the target being made by this job * 3) An FILE* for writing out the commands. This is only * used before the job is actually started. * 4) Things used for handling the shell's output. * the output is being caught via a pipe and * the descriptors of our pipe, an array in which output is line * buffered and the current position in that buffer are all * maintained for each job. * 5) A word of flags which determine how the module handles errors, * echoing, etc. for the job * * The job "table" is kept as a linked Lst in 'jobs', with the number of * active jobs maintained in the 'nJobs' variable. At no time will this * exceed the value of 'maxJobs', initialized by the Job_Init function. * * When a job is finished, the Make_Update function is called on each of the * parents of the node which was just remade. This takes care of the upward * traversal of the dependency graph. */ #define JOB_BUFSIZE 1024 typedef struct Job_ { pid_t pid; /* The child's process ID */ GNode *node; /* The target the child is making */ LstNode tailCmds; /* The node of the first command to be * saved when the job has been run */ FILE *cmdFILE; /* When creating the shell script, this is * where the commands go */ int rmtID; /* ID returned from Rmt module */ short flags; /* Flags to control treatment of job */ #define JOB_IGNERR 0x001 /* Ignore non-zero exits */ #define JOB_SILENT 0x002 /* no output */ #define JOB_SPECIAL 0x004 /* Target is a special one. */ #define JOB_IGNDOTS 0x008 /* Ignore "..." lines when processing * commands */ #define JOB_RESTART 0x080 /* Job needs to be completely restarted */ #define JOB_RESUME 0x100 /* Job needs to be resumed b/c it stopped, * for some reason */ #define JOB_CONTINUING 0x200 /* We are in the process of resuming this job. * Used to avoid infinite recursion between * JobFinish and JobRestart */ int inPipe; /* Input side of pipe associated * with job's output channel */ int outPipe; /* Output side of pipe associated with * job's output channel */ char outBuf[JOB_BUFSIZE + 1]; /* Buffer for storing the output of the * job, line by line */ int curPos; /* Current position in op_outBuf */ } Job; /* * error handling variables */ static int errors = 0; /* number of errors reported */ static int aborting = 0; /* why is the make aborting? */ #define ABORT_ERROR 1 /* Because of an error */ #define ABORT_INTERRUPT 2 /* Because it was interrupted */ #define ABORT_WAIT 3 /* Waiting for jobs to finish */ static int numCommands; /* The number of commands actually printed * for a target. Should this number be * 0, no shell will be executed. */ /* * Return values from JobStart. */ #define JOB_RUNNING 0 /* Job is running */ #define JOB_ERROR 1 /* Error in starting the job */ #define JOB_FINISHED 2 /* The job is already finished */ #define JOB_STOPPED 3 /* The job is stopped */ #define SHELL_ECHO_OFF "set -" #define SHELL_ECHO_ON "set -v" #define SHELL_ERROR_ON "set -e" #define SHELL_ERROR_OFF "set +e" #define SHELL_ECHO_FLAG "v" #define SHELL_ERROR_FLAG "e" static const char *shellPath = _PATH_BSHELL; static const char *shellName = "sh"; static int maxJobs; /* The most children we can run at once */ static int nJobs; /* The number of children currently running */ static LIST jobs; /* The structures that describe them */ static bool jobFull; /* Flag to tell when the job table is full. It * is set true when nJobs equals maxJobs */ static fd_set *outputsp; /* Set of descriptors of pipes connected to * the output channels of children */ static int outputsn; static GNode *lastNode; /* The node for which output was most recently * produced. */ static char *targFmt; /* Format string to use to head output from a * job when it's not the most-recent job heard * from */ # define TARG_FMT "--- %s ---\n" /* Default format */ # define MESSAGE(fp, gn) \ (void)fprintf(fp, targFmt, gn->name); /* * When JobStart attempts to run a job but isn't allowed to, * the job is placed on the stoppedJobs queue to be run * when the next job finishes. */ static LIST stoppedJobs; /* Lst of Job structures describing * jobs that were stopped due to concurrency * limits or migration home */ #if defined(USE_PGRP) && defined(SYSV) # define KILL(pid, sig) killpg(-(pid), (sig)) #else # if defined(USE_PGRP) # define KILL(pid, sig) killpg((pid), (sig)) # else # define KILL(pid, sig) kill((pid), (sig)) # endif #endif /* * Grmpf... There is no way to set bits of the wait structure * anymore with the stupid W*() macros. I liked the union wait * stuff much more. So, we devise our own macros... This is * really ugly, use dramamine sparingly. You have been warned. */ #define W_SETMASKED(st, val, fun) \ { \ int sh = (int) ~0; \ int mask = fun(sh); \ \ for (sh = 0; ((mask >> sh) & 1) == 0; sh++) \ continue; \ *(st) = (*(st) & ~mask) | ((val) << sh); \ } #define W_SETTERMSIG(st, val) W_SETMASKED(st, val, WTERMSIG) #define W_SETEXITSTATUS(st, val) W_SETMASKED(st, val, WEXITSTATUS) static void pass_signal_to_job(void *, void *); static void SigHandler(int); static void handle_all_signals(void); static void handle_signal(int); static int JobCmpPid(void *, void *); static int JobPrintCommand(LstNode, void *); static void JobSaveCommand(void *, void *); static void JobClose(Job *); static void JobFinish(Job *, int *); static void JobExec(Job *, char **); static void JobMakeArgv(Job *, char **); static void JobRestart(Job *); static int JobStart(GNode *, int); static char *JobOutput(Job *, char *, char *, int); static void JobDoOutput(Job *, bool); static void JobInterrupt(int, int); static void JobRestartJobs(void); static void DBPRINTF(Job *, const char *, ...); static void debug_printf(const char *, ...); static FILE *new_command_file(void); static void setup_signal(int); static volatile sig_atomic_t got_signal; static volatile sig_atomic_t got_SIGINT, got_SIGHUP, got_SIGQUIT, got_SIGTERM, got_SIGTSTP, got_SIGTTOU, got_SIGTTIN, got_SIGWINCH; #define TMPPAT "/tmp/makeXXXXXXXXXX" static FILE * new_command_file() { int fd; FILE *f; char tmp[] = TMPPAT; fd = mkstemp(tmp); if (fd == -1) return NULL; f = fdopen(fd, "w"); if (f == NULL) close(fd); eunlink(tmp); return f; } static void SigHandler(int sig) { switch(sig) { case SIGINT: got_SIGINT++; got_signal = 1; break; case SIGHUP: got_SIGHUP++; got_signal = 1; break; case SIGQUIT: got_SIGQUIT++; got_signal = 1; break; case SIGTERM: got_SIGTERM++; got_signal = 1; break; #ifdef USE_PGRP case SIGTSTP: got_SIGTSTP++; got_signal = 1; break; case SIGTTOU: got_SIGTTOU++; got_signal = 1; break; case SIGTTIN: got_SIGTTIN++; got_signal = 1; break; case SIGWINCH: got_SIGWINCH++; got_signal = 1; break; #endif } } static void handle_all_signals() { if (got_signal) got_signal = 0; else return; if (got_SIGINT) { got_SIGINT=0; handle_signal(SIGINT); } if (got_SIGHUP) { got_SIGHUP=0; handle_signal(SIGHUP); } if (got_SIGQUIT) { got_SIGQUIT=0; handle_signal(SIGQUIT); } if (got_SIGTERM) { got_SIGTERM=0; handle_signal(SIGTERM); } if (got_SIGTSTP) { got_SIGTSTP=0; handle_signal(SIGTSTP); } if (got_SIGTTOU) { got_SIGTTOU=0; handle_signal(SIGTTOU); } if (got_SIGTTIN) { got_SIGTTIN=0; handle_signal(SIGTTIN); } if (got_SIGWINCH) { got_SIGWINCH=0; handle_signal(SIGWINCH); } } /*- *----------------------------------------------------------------------- * JobCondPassSig -- * Pass a signal to a job if USE_PGRP * is defined. * * Side Effects: * None, except the job may bite it. *----------------------------------------------------------------------- */ static void pass_signal_to_job(void *jobp, /* Job to biff */ void *signop) /* Signal to send it */ { Job *job = (Job *)jobp; int signo = *(int *)signop; if (DEBUG(JOB)) { (void)fprintf(stdout, "pass_signal_to_job passing signal %d to child %ld.\n", signo, (long)job->pid); (void)fflush(stdout); } KILL(job->pid, signo); } /*- *----------------------------------------------------------------------- * JobPassSig -- * Pass a signal to all local jobs if USE_PGRP is defined, * then die ourselves. * * Side Effects: * We die by the same signal. *----------------------------------------------------------------------- */ static void handle_signal(int signo) /* The signal number we've received */ { sigset_t nmask, omask; struct sigaction act; if (DEBUG(JOB)) { (void)fprintf(stdout, "handle_signal(%d) called.\n", signo); (void)fflush(stdout); } Lst_ForEach(&jobs, pass_signal_to_job, &signo); /* * Deal with proper cleanup based on the signal received. We only run * the .INTERRUPT target if the signal was in fact an interrupt. The * other three termination signals are more of a "get out *now*" * command. */ if (signo == SIGINT) { JobInterrupt(true, signo); } else if (signo == SIGHUP || signo == SIGTERM || signo == SIGQUIT) { JobInterrupt(false, signo); } /* * Leave gracefully if SIGQUIT, rather than core dumping. */ if (signo == SIGQUIT) { Finish(0); } /* * Send ourselves the signal now we've given the message to everyone * else. Note we block everything else possible while we're getting * the signal. This ensures that all our jobs get continued when we * wake up before we take any other signal. */ sigemptyset(&nmask); sigaddset(&nmask, signo); sigprocmask(SIG_SETMASK, &nmask, &omask); memset(&act, 0, sizeof act); act.sa_handler = SIG_DFL; sigemptyset(&act.sa_mask); act.sa_flags = 0; sigaction(signo, &act, NULL); if (DEBUG(JOB)) { (void)fprintf(stdout, "handle_signal passing signal to self, mask = %x.\n", ~0 & ~(1 << (signo-1))); (void)fflush(stdout); } (void)signal(signo, SIG_DFL); (void)KILL(getpid(), signo); signo = SIGCONT; Lst_ForEach(&jobs, pass_signal_to_job, &signo); (void)sigprocmask(SIG_SETMASK, &omask, NULL); sigprocmask(SIG_SETMASK, &omask, NULL); act.sa_handler = SigHandler; sigaction(signo, &act, NULL); } /*- *----------------------------------------------------------------------- * JobCmpPid -- * Compare the pid of the job with the given pid and return 0 if they * are equal. This function is called from Job_CatchChildren via * Lst_Find to find the job descriptor of the finished job. * * Results: * 0 if the pid's match *----------------------------------------------------------------------- */ static int JobCmpPid(void *job, /* job to examine */ void *pid) /* process id desired */ { return *(pid_t *)pid - ((Job *)job)->pid; } static void DBPRINTF(Job *job, const char *fmt, ...) { va_list va; va_start(va, fmt); if (DEBUG(JOB)) { (void)vfprintf(stdout, fmt, va); fflush(stdout); } vfprintf(job->cmdFILE, fmt, va); va_end(va); } static void debug_printf(const char *fmt, ...) { if (DEBUG(JOB)) { va_list va; va_start(va, fmt); (void)vfprintf(stdout, fmt, va); fflush(stdout); va_end(va); } } /*- *----------------------------------------------------------------------- * JobPrintCommand -- * Put out another command for the given job. If the command starts * with an @ or a - we process it specially. In the former case, * so long as the -s and -n flags weren't given to make, we stick * a shell-specific echoOff command in the script. In the latter, * we ignore errors for the entire job, unless the shell has error * control. * If the command is just "..." we take all future commands for this * job to be commands to be executed once the entire graph has been * made and return non-zero to signal that the end of the commands * was reached. These commands are later attached to the end_node * node and executed by Job_End when all things are done. * This function is called from JobStart via Lst_Find * * Results: * Always 1, unless the command was "..." * * Side Effects: * If the command begins with a '-' and the shell has no error control, * the JOB_IGNERR flag is set in the job descriptor. * If the command is "..." and we're not ignoring such things, * tailCmds is set to the successor node of the cmd. * numCommands is incremented if the command is actually printed. *----------------------------------------------------------------------- */ static int JobPrintCommand(LstNode cmdNode, /* command string to print */ void *jobp) /* job for which to print it */ { bool noSpecials; /* true if we shouldn't worry about * inserting special commands into * the input stream. */ bool shutUp = false; /* true if we put a no echo command * into the command file */ bool errOff = false; /* true if we turned error checking * off before printing the command * and need to turn it back on */ char *cmdTemplate; /* Template to use when printing the * command */ char *cmdStart; /* Start of expanded command */ char *cmd = (char *)Lst_Datum(cmdNode); Job *job = (Job *)jobp; noSpecials = (noExecute && !(job->node->type & OP_MAKE)); if (strcmp(cmd, "...") == 0) { job->node->type |= OP_SAVE_CMDS; if ((job->flags & JOB_IGNDOTS) == 0) { job->tailCmds = Lst_Succ(cmdNode); return 0; } return 1; } numCommands++; /* For debugging, we replace each command with the result of expanding * the variables in the command. */ cmdStart = cmd = Var_Subst(cmd, &job->node->context, false); Lst_Replace(cmdNode, cmdStart); cmdTemplate = "%s\n"; /* * Check for leading @' and -'s to control echoing and error checking. */ for (;; cmd++) { if (*cmd == '@') shutUp = DEBUG(LOUD) ? false : true; else if (*cmd == '-') errOff = true; else if (*cmd != '+') break; } while (isspace(*cmd)) cmd++; if (shutUp) { if (!(job->flags & JOB_SILENT) && !noSpecials) { DBPRINTF(job, "%s\n", SHELL_ECHO_OFF); } else { shutUp = false; } } if (errOff) { if ( !(job->flags & JOB_IGNERR) && !noSpecials) { /* * we don't want the error-control commands showing * up either, so we turn off echoing while executing * them. We could put another field in the shell * structure to tell JobDoOutput to look for this * string too, but why make it any more complex than * it already is? */ if (!(job->flags & JOB_SILENT) && !shutUp) { DBPRINTF(job, "%s; %s; %s\n", SHELL_ECHO_OFF, SHELL_ERROR_OFF, SHELL_ECHO_ON); } else { DBPRINTF(job, "%s\n", SHELL_ERROR_OFF); } } else { errOff = false; } } DBPRINTF(job, cmdTemplate, cmd); if (errOff) { /* * If echoing is already off, there's no point in issuing the * echoOff command. Otherwise we issue it and pretend it was on * for the whole command... */ if (!shutUp && !(job->flags & JOB_SILENT)) { DBPRINTF(job, "%s\n", SHELL_ECHO_OFF); shutUp = true; } DBPRINTF(job, "%s\n", SHELL_ERROR_ON); } if (shutUp) { DBPRINTF(job, "%s\n", SHELL_ECHO_ON); } return 1; } /*- *----------------------------------------------------------------------- * JobSaveCommand -- * Save a command to be executed when everything else is done. * Callback function for JobFinish... * * Side Effects: * The command is tacked onto the end of end_node's commands list. *----------------------------------------------------------------------- */ static void JobSaveCommand(void *cmd, void *gn) { GNode *g = (GNode *)gn; char *result; result = Var_Subst((char *)cmd, &g->context, false); Lst_AtEnd(&end_node->commands, result); } /*- *----------------------------------------------------------------------- * JobClose -- * Called to close both input and output pipes when a job is finished. * * Side Effects: * The file descriptors associated with the job are closed. *----------------------------------------------------------------------- */ static void JobClose(Job *job) { FD_CLR(job->inPipe, outputsp); if (job->outPipe != job->inPipe) { (void)close(job->outPipe); } JobDoOutput(job, true); (void)close(job->inPipe); } /*- *----------------------------------------------------------------------- * JobFinish -- * Do final processing for the given job including updating * parents and starting new jobs as available/necessary. Note * that we pay no attention to the JOB_IGNERR flag here. * This is because when we're called because of a noexecute flag * or something, jstat.w_status is 0 and when called from * Job_CatchChildren, the status is zeroed if it s/b ignored. * * Side Effects: * Some nodes may be put on the toBeMade queue. * Final commands for the job are placed on end_node. * * If we got an error and are aborting (aborting == ABORT_ERROR) and * the job list is now empty, we are done for the day. * If we recognized an error (errors !=0), we set the aborting flag * to ABORT_ERROR so no more jobs will be started. *----------------------------------------------------------------------- */ /*ARGSUSED*/ static void JobFinish(Job *job, /* job to finish */ int *status) /* sub-why job went away */ { bool done; if ((WIFEXITED(*status) && WEXITSTATUS(*status) != 0 && !(job->flags & JOB_IGNERR)) || (WIFSIGNALED(*status) && WTERMSIG(*status) != SIGCONT)) { /* * If it exited non-zero and either we're doing things our * way or we're not ignoring errors, the job is finished. * Similarly, if the shell died because of a signal * the job is also finished. In these * cases, finish out the job's output before printing the exit * status... */ JobClose(job); if (job->cmdFILE != NULL && job->cmdFILE != stdout) { (void)fclose(job->cmdFILE); } done = true; } else if (WIFEXITED(*status)) { /* * Deal with ignored errors in -B mode. We need to print a * message telling of the ignored error as well as setting * status.w_status to 0 so the next command gets run. To do * this, we set done to be true if in -B mode and the job * exited non-zero. */ done = WEXITSTATUS(*status) != 0; /* * Old comment said: "Note we don't want to close down any of * the streams until we know we're at the end." But we do. * Otherwise when are we going to print the rest of the stuff? */ JobClose(job); } else { /* * No need to close things down or anything. */ done = false; } if (done || WIFSTOPPED(*status) || (WIFSIGNALED(*status) && WTERMSIG(*status) == SIGCONT) || DEBUG(JOB)) { FILE *out; out = stdout; if (WIFEXITED(*status)) { debug_printf("Process %ld exited.\n", (long)job->pid); if (WEXITSTATUS(*status) != 0) { if (job->node != lastNode) { MESSAGE(out, job->node); lastNode = job->node; } (void)fprintf(out, "*** Error code %d%s\n", WEXITSTATUS(*status), (job->flags & JOB_IGNERR) ? "(ignored)" : ""); if (job->flags & JOB_IGNERR) { *status = 0; } } else if (DEBUG(JOB)) { if (job->node != lastNode) { MESSAGE(out, job->node); lastNode = job->node; } (void)fprintf(out, "*** Completed successfully\n"); } } else if (WIFSTOPPED(*status)) { debug_printf("Process %ld stopped.\n", (long)job->pid); if (job->node != lastNode) { MESSAGE(out, job->node); lastNode = job->node; } (void)fprintf(out, "*** Stopped -- signal %d\n", WSTOPSIG(*status)); job->flags |= JOB_RESUME; Lst_AtEnd(&stoppedJobs, job); (void)fflush(out); return; } else if (WTERMSIG(*status) == SIGCONT) { /* * If the beastie has continued, shift the Job from the * stopped list to the running one (or re-stop it if * concurrency is exceeded) and go and get another * child. */ if (job->flags & (JOB_RESUME|JOB_RESTART)) { if (job->node != lastNode) { MESSAGE(out, job->node); lastNode = job->node; } (void)fprintf(out, "*** Continued\n"); } if (!(job->flags & JOB_CONTINUING)) { debug_printf( "Warning: " "process %ld was not continuing.\n", (long)job->pid); #if 0 /* * We don't really want to restart a job from * scratch just because it continued, * especially not without killing the * continuing process! That's why this is * ifdef'ed out. FD - 9/17/90 */ JobRestart(job); #endif } job->flags &= ~JOB_CONTINUING; Lst_AtEnd(&jobs, job); nJobs++; debug_printf("Process %ld is continuing locally.\n", (long)job->pid); if (nJobs == maxJobs) { jobFull = true; debug_printf("Job queue is full.\n"); } (void)fflush(out); return; } else { if (job->node != lastNode) { MESSAGE(out, job->node); lastNode = job->node; } (void)fprintf(out, "*** Signal %d\n", WTERMSIG(*status)); } (void)fflush(out); } done = true; if (done && aborting != ABORT_ERROR && aborting != ABORT_INTERRUPT && *status == 0) { /* As long as we aren't aborting and the job didn't return a * non-zero status that we shouldn't ignore, we call * Make_Update to update the parents. In addition, any saved * commands for the node are placed on the .END target. */ Lst_ForEachFrom(job->tailCmds, JobSaveCommand, job->node); job->node->made = MADE; Make_Update(job->node); free(job); } else if (*status != 0) { errors++; free(job); } JobRestartJobs(); /* * Set aborting if any error. */ if (errors && !keepgoing && aborting != ABORT_INTERRUPT) { /* * If we found any errors in this batch of children and the -k * flag wasn't given, we set the aborting flag so no more jobs * get started. */ aborting = ABORT_ERROR; } if (aborting == ABORT_ERROR && Job_Empty()) { /* * If we are aborting and the job table is now empty, we finish. */ Finish(errors); } } /*- *----------------------------------------------------------------------- * JobExec -- * Execute the shell for the given job. Called from JobStart and * JobRestart. * * Side Effects: * A shell is executed, outputs is altered and the Job structure added * to the job table. *----------------------------------------------------------------------- */ static void JobExec(Job *job, char **argv) { pid_t cpid; /* ID of new child */ if (DEBUG(JOB)) { int i; (void)fprintf(stdout, "Running %s\n", job->node->name); (void)fprintf(stdout, "\tCommand: "); for (i = 0; argv[i] != NULL; i++) { (void)fprintf(stdout, "%s ", argv[i]); } (void)fprintf(stdout, "\n"); (void)fflush(stdout); } /* * Some jobs produce no output and it's disconcerting to have * no feedback of their running (since they produce no output, the * banner with their name in it never appears). This is an attempt to * provide that feedback, even if nothing follows it. */ if (lastNode != job->node && !(job->flags & JOB_SILENT)) { MESSAGE(stdout, job->node); lastNode = job->node; } if ((cpid = fork()) == -1) { Punt("Cannot fork"); } else if (cpid == 0) { /* * Must duplicate the input stream down to the child's input * and reset it to the beginning (again). Since the stream was * marked close-on-exec, we must clear that bit in the new * input. */ if (dup2(fileno(job->cmdFILE), 0) == -1) Punt("Cannot dup2(job->cmdFile): %s", strerror(errno)); (void)fcntl(0, F_SETFD, 0); (void)lseek(0, 0, SEEK_SET); /* * Set up the child's output to be routed through the pipe * we've created for it. */ if (dup2(job->outPipe, 1) == -1) Punt("Cannot dup2(job->outPipe): %s", strerror(errno)); /* * The output channels are marked close on exec. This bit was * duplicated by the dup2 (on some systems), so we have to * clear it before routing the shell's error output to the same * place as its standard output. */ (void)fcntl(1, F_SETFD, 0); if (dup2(1, 2) == -1) Punt("Cannot dup2(stdout): %s", strerror(errno)); #ifdef USE_PGRP /* * We want to switch the child into a different process family * so we can kill it and all its descendants in one fell swoop, * by killing its process family, but not commit suicide. */ # if defined(SYSV) (void)setsid(); # else (void)setpgid(0, getpid()); # endif #endif /* USE_PGRP */ (void)execv(shellPath, argv); (void)write(STDERR_FILENO, "Could not execute shell\n", sizeof("Could not execute shell")); _exit(1); } else { job->pid = cpid; /* we set the current position in the buffer to the beginning * and mark another stream to watch in the outputs mask */ job->curPos = 0; if (outputsp == NULL || job->inPipe > outputsn) { int fdn, ofdn; fd_set *tmp; fdn = howmany(job->inPipe+1, NFDBITS); ofdn = outputsn ? howmany(outputsn+1, NFDBITS) : 0; if (fdn != ofdn) { tmp = recalloc(outputsp, fdn, sizeof(fd_mask)); if (tmp == NULL) return; outputsp = tmp; } outputsn = job->inPipe; } FD_SET(job->inPipe, outputsp); /* * XXX: Used to not happen if REMOTE. Why? */ if (job->cmdFILE != NULL && job->cmdFILE != stdout) { (void)fclose(job->cmdFILE); job->cmdFILE = NULL; } } /* * Now the job is actually running, add it to the table. */ nJobs++; Lst_AtEnd(&jobs, job); if (nJobs == maxJobs) { jobFull = true; } } /*- *----------------------------------------------------------------------- * JobMakeArgv -- * Create the argv needed to execute the shell for a given job. *----------------------------------------------------------------------- */ static void JobMakeArgv(Job *job, char **argv) { int argc; static char args[10]; /* For merged arguments */ argv[0] = (char *)shellName; argc = 1; (void)snprintf(args, sizeof(args), "-%s%s", (job->flags & JOB_IGNERR) ? "" : SHELL_ERROR_FLAG, (job->flags & JOB_SILENT) ? "" : SHELL_ECHO_FLAG); if (args[1]) { argv[argc] = args; argc++; } argv[argc] = NULL; } /*- *----------------------------------------------------------------------- * JobRestart -- * Restart a job that stopped for some reason. * * Side Effects: * jobFull will be set if the job couldn't be run. *----------------------------------------------------------------------- */ static void JobRestart(Job *job) { if (job->flags & JOB_RESTART) { /* * Set up the control arguments to the shell. This is based on * the flags set earlier for this job. If the JOB_IGNERR flag * is clear, the 'exit' flag of the commandShell is used to * cause it to exit upon receiving an error. If the JOB_SILENT * flag is clear, the 'echo' flag of the commandShell is used * to get it to start echoing as soon as it starts processing * commands. */ char *argv[4]; JobMakeArgv(job, argv); if (DEBUG(JOB)) { (void)fprintf(stdout, "Restarting %s...", job->node->name); (void)fflush(stdout); } if (nJobs >= maxJobs && !(job->flags & JOB_SPECIAL)) { /* * Can't be exported and not allowed to run locally -- * put it back on the hold queue and mark the table * full */ debug_printf("holding\n"); Lst_AtFront(&stoppedJobs, job); jobFull = true; debug_printf("Job queue is full.\n"); return; } else { /* * Job may be run locally. */ debug_printf("running locally\n"); } JobExec(job, argv); } else { /* * The job has stopped and needs to be restarted. Why it * stopped, we don't know... */ debug_printf("Resuming %s...", job->node->name); if ((nJobs < maxJobs || ((job->flags & JOB_SPECIAL) && maxJobs == 0)) && nJobs != maxJobs) { /* * If we haven't reached the concurrency limit already * (or maxJobs is 0), it's ok to resume the job. */ bool error; int status; error = KILL(job->pid, SIGCONT) != 0; if (!error) { /* * Make sure the user knows we've continued the * beast and actually put the thing in the job * table. */ job->flags |= JOB_CONTINUING; W_SETTERMSIG(&status, SIGCONT); JobFinish(job, &status); job->flags &= ~(JOB_RESUME|JOB_CONTINUING); debug_printf("done\n"); } else { Error("couldn't resume %s: %s", job->node->name, strerror(errno)); status = 0; W_SETEXITSTATUS(&status, 1); JobFinish(job, &status); } } else { /* * Job cannot be restarted. Mark the table as full and * place the job back on the list of stopped jobs. */ debug_printf("table full\n"); Lst_AtFront(&stoppedJobs, job); jobFull = true; debug_printf("Job queue is full.\n"); } } } /*- *----------------------------------------------------------------------- * JobStart -- * Start a target-creation process going for the target described * by the graph node gn. * * Results: * JOB_ERROR if there was an error in the commands, JOB_FINISHED * if there isn't actually anything left to do for the job and * JOB_RUNNING if the job has been started. * * Side Effects: * A new Job node is created and added to the list of running * jobs. PMake is forked and a child shell created. *----------------------------------------------------------------------- */ static int JobStart(GNode *gn, /* target to create */ int flags) /* flags for the job to override normal ones. * e.g. JOB_SPECIAL */ { Job *job; /* new job descriptor */ char *argv[4]; /* Argument vector to shell */ bool cmdsOK; /* true if the nodes commands were all right */ bool noExec; /* Set true if we decide not to run the job */ int fd[2]; job = emalloc(sizeof(Job)); if (job == NULL) { Punt("JobStart out of memory"); } job->node = gn; job->tailCmds = NULL; /* * Set the initial value of the flags for this job based on the global * ones and the node's attributes... Any flags supplied by the caller * are also added to the field. */ job->flags = flags; if (Targ_Ignore(gn)) { job->flags |= JOB_IGNERR; } if (Targ_Silent(gn)) { job->flags |= JOB_SILENT; } /* * Check the commands now so any attributes from .DEFAULT have a chance * to migrate to the node */ cmdsOK = Job_CheckCommands(gn, Error); /* * If the -n flag wasn't given, we open up OUR (not the child's) * temporary file to stuff commands in it. The thing is rd/wr so we * don't need to reopen it to feed it to the shell. If the -n flag * *was* given, we just set the file to be stdout. Cute, huh? */ if ((gn->type & OP_MAKE) || (!noExecute && !touchFlag)) { /* * We're serious here, but if the commands were bogus, we're * also dead... */ if (!cmdsOK) { DieHorribly(); } job->cmdFILE = new_command_file(); if (job->cmdFILE == NULL) { Punt("Error creating command file"); } (void)fcntl(fileno(job->cmdFILE), F_SETFD, FD_CLOEXEC); /* * Send the commands to the command file, flush all its buffers * then rewind and remove the thing. */ noExec = false; /* * We can do all the commands at once. hooray for * sanity */ numCommands = 0; Lst_ForEachNodeWhile(&gn->commands, JobPrintCommand, job); /* * If we didn't print out any commands to the shell * script, there's not much point in executing the * shell, is there? */ if (numCommands == 0) { noExec = true; } } else if (noExecute) { /* * Not executing anything -- just print all the commands to * stdout in one fell swoop. This will still set up * job->tailCmds correctly. */ if (lastNode != gn) { MESSAGE(stdout, gn); lastNode = gn; } job->cmdFILE = stdout; /* * Only print the commands if they're ok, but don't die if * they're not -- just let the user know they're bad and keep * going. It doesn't do any harm in this case and may do some * good. */ if (cmdsOK) { Lst_ForEachNodeWhile(&gn->commands, JobPrintCommand, job); } /* * Don't execute the shell, thank you. */ noExec = true; } else { /* * Just touch the target and note that no shell should be * executed. Set cmdFILE to stdout to make life easier. Check * the commands, too, but don't die if they're no good -- it * does no harm to keep working up the graph. */ job->cmdFILE = stdout; Job_Touch(gn, job->flags & JOB_SILENT); noExec = true; } /* * If we're not supposed to execute a shell, don't. */ if (noExec) { /* * Unlink and close the command file if we opened one */ if (job->cmdFILE != stdout) { if (job->cmdFILE != NULL) (void)fclose(job->cmdFILE); } else { (void)fflush(stdout); } /* * We only want to work our way up the graph if we aren't here * because the commands for the job were no good. */ if (cmdsOK) { if (aborting == 0) { Lst_ForEachFrom(job->tailCmds, JobSaveCommand, job->node); Make_Update(job->node); } free(job); return JOB_FINISHED; } else { free(job); return JOB_ERROR; } } else { (void)fflush(job->cmdFILE); } /* * Set up the control arguments to the shell. This is based on the flags * set earlier for this job. */ JobMakeArgv(job, argv); /* Create the pipe by which we'll get the shell's output. */ if (pipe(fd) == -1) Punt("Cannot create pipe: %s", strerror(errno)); job->inPipe = fd[0]; job->outPipe = fd[1]; (void)fcntl(job->inPipe, F_SETFD, FD_CLOEXEC); (void)fcntl(job->outPipe, F_SETFD, FD_CLOEXEC); if (nJobs >= maxJobs && !(job->flags & JOB_SPECIAL) && maxJobs != 0) { /* * The job can only be run locally, but we've hit the limit of * local concurrency, so put the job on hold until some other * job finishes. Note that the special jobs (.BEGIN, .INTERRUPT * and .END) may be run locally even when the local limit has * been reached (e.g. when maxJobs == 0), though they will be * exported if at all possible. In addition, any target marked * with .NOEXPORT will be run locally if maxJobs is 0. */ jobFull = true; debug_printf("Can only run job locally.\n"); job->flags |= JOB_RESTART; Lst_AtEnd(&stoppedJobs, job); } else { if (nJobs >= maxJobs) { /* * If we're running this job locally as a special case * (see above), at least say the table is full. */ jobFull = true; debug_printf("Local job queue is full.\n"); } JobExec(job, argv); } return JOB_RUNNING; } static char * JobOutput(Job *job, char *cp, char *endp, int msg) { char *ecp; ecp = strstr(cp, SHELL_ECHO_OFF); while (ecp != NULL) { if (cp != ecp) { *ecp = '\0'; if (msg && job->node != lastNode) { MESSAGE(stdout, job->node); lastNode = job->node; } /* * The only way there wouldn't be a newline after * this line is if it were the last in the buffer. * however, since the non-printable comes after it, * there must be a newline, so we don't print one. */ (void)fprintf(stdout, "%s", cp); (void)fflush(stdout); } cp = ecp + strlen(SHELL_ECHO_OFF); if (cp != endp) { /* * Still more to print, look again after skipping * the whitespace following the non-printable * command.... */ cp++; while (*cp == ' ' || *cp == '\t' || *cp == '\n') { cp++; } ecp = strstr(cp, SHELL_ECHO_OFF); } else { return cp; } } return cp; } /*- *----------------------------------------------------------------------- * JobDoOutput -- * This functions is called whenever there is something to read on the * pipe. We collect more output from the given job and store it in the * job's outBuf. If this makes up a line, we print it tagged by the job's * identifier, as necessary. * We also keep our figurative eye out for the * 'noPrint' line for the shell from which the output came. If * we recognize a line, we don't print it. If the command is not * alone on the line (the character after it is not \0 or \n), we * do print whatever follows it. * * Side Effects: * curPos may be shifted as may the contents of outBuf. *----------------------------------------------------------------------- */ static void JobDoOutput(Job *job, /* the job whose output needs printing */ bool finish) /* true if this is the last time we'll be * called for this job */ { bool gotNL = false; /* true if got a newline */ bool fbuf; /* true if our buffer filled up */ int nr; /* number of bytes read */ int i; /* auxiliary index into outBuf */ int max; /* limit for i (end of current data) */ int nRead; /* (Temporary) number of bytes read */ /* * Read as many bytes as will fit in the buffer. */ end_loop: gotNL = false; fbuf = false; nRead = read(job->inPipe, &job->outBuf[job->curPos], JOB_BUFSIZE - job->curPos); if (nRead == -1) { if (DEBUG(JOB)) { perror("JobDoOutput(piperead)"); } nr = 0; } else { nr = nRead; } /* * If we hit the end-of-file (the job is dead), we must flush its * remaining output, so pretend we read a newline if there's any * output remaining in the buffer. * Also clear the 'finish' flag so we stop looping. */ if (nr == 0 && job->curPos != 0) { job->outBuf[job->curPos] = '\n'; nr = 1; finish = false; } else if (nr == 0) { finish = false; } /* * Look for the last newline in the bytes we just got. If there is * one, break out of the loop with 'i' as its index and gotNL set * true. */ max = job->curPos + nr; for (i = job->curPos + nr - 1; i >= job->curPos; i--) { if (job->outBuf[i] == '\n') { gotNL = true; break; } else if (job->outBuf[i] == '\0') { /* * To be fixed: don't use printf, it stops at NUL bytes. */ job->outBuf[i] = ' '; } } if (!gotNL) { job->curPos += nr; if (job->curPos == JOB_BUFSIZE) { /* * If we've run out of buffer space, we have no choice * but to print the stuff. sigh. */ fbuf = true; i = job->curPos; } } if (gotNL || fbuf) { /* * Need to send the output to the screen. Null terminate it * first, overwriting the newline character if there was one. * So long as the line isn't one we should filter (according * to the shell description), we print the line, preceded * by a target banner if this target isn't the same as the * one for which we last printed something. * The rest of the data in the buffer are then shifted down * to the start of the buffer and curPos is set accordingly. */ job->outBuf[i] = '\0'; if (i >= job->curPos) { char *cp; cp = JobOutput(job, job->outBuf, &job->outBuf[i], false); /* * There's still more in that thar buffer. This time, * though, we know there's no newline at the end, so we * add one of our own free will. */ if (*cp != '\0') { if (job->node != lastNode) { MESSAGE(stdout, job->node); lastNode = job->node; } (void)fprintf(stdout, "%s%s", cp, gotNL ? "\n" : ""); (void)fflush(stdout); } } if (i < max - 1) { /* shift the remaining characters down */ (void)memcpy(job->outBuf, &job->outBuf[i + 1], max - (i + 1)); job->curPos = max - (i + 1); } else { /* * We have written everything out, so we just start over * from the start of the buffer. No copying. No nothing. */ job->curPos = 0; } } if (finish) { /* * If the finish flag is true, we must loop until we hit * end-of-file on the pipe. This is guaranteed to happen * eventually since the other end of the pipe is now closed * (we closed it explicitly and the child has exited). When * we do get an EOF, finish will be set false and we'll fall * through and out. */ goto end_loop; } } /*- *----------------------------------------------------------------------- * Job_CatchChildren -- * Handle the exit of a child. Called from Make_Make. * * Side Effects: * The job descriptor is removed from the list of children. * * Notes: * We do waits, blocking or not, according to the wisdom of our * caller, until there are no more children to report. For each * job, call JobFinish to finish things off. This will take care of * putting jobs on the stoppedJobs queue. *----------------------------------------------------------------------- */ void Job_CatchChildren() { pid_t pid; /* pid of dead child */ Job *job; /* job descriptor for dead child */ LstNode jnode; /* list element for finding job */ int status; /* Exit/termination status */ /* * Don't even bother if we know there's no one around. */ if (nJobs == 0) { return; } while ((pid = waitpid((pid_t) -1, &status, WNOHANG|WUNTRACED)) > 0) { handle_all_signals(); debug_printf("Process %ld exited or stopped.\n", (long)pid); jnode = Lst_Find(&jobs, JobCmpPid, &pid); if (jnode == NULL) { if (WIFSIGNALED(status) && (WTERMSIG(status) == SIGCONT)) { jnode = Lst_Find(&stoppedJobs, JobCmpPid, &pid); if (jnode == NULL) { Error("Resumed child (%ld) not in table", (long)pid); continue; } job = (Job *)Lst_Datum(jnode); Lst_Remove(&stoppedJobs, jnode); } else { Error("Child (%ld) not in table?", (long)pid); continue; } } else { job = (Job *)Lst_Datum(jnode); Lst_Remove(&jobs, jnode); nJobs--; if (jobFull) debug_printf("Job queue is no longer full.\n"); jobFull = false; } JobFinish(job, &status); } } /*- *----------------------------------------------------------------------- * Job_CatchOutput -- * Catch the output from our children, if we're using * pipes do so. Otherwise just block time until we get a * signal (most likely a SIGCHLD) since there's no point in * just spinning when there's nothing to do and the reaping * of a child can wait for a while. * * Side Effects: * Output is read from pipes if we're piping. * ----------------------------------------------------------------------- */ void Job_CatchOutput(void) { int nfds; struct timeval timeout; LstNode ln; Job *job; int count = howmany(outputsn+1, NFDBITS) * sizeof(fd_mask); fd_set *readfdsp = malloc(count); (void)fflush(stdout); if (readfdsp == NULL) return; memcpy(readfdsp, outputsp, count); timeout.tv_sec = SEL_SEC; timeout.tv_usec = SEL_USEC; nfds = select(outputsn+1, readfdsp, NULL, NULL, &timeout); handle_all_signals(); if (nfds > 0) { for (ln = Lst_First(&jobs); nfds && ln != NULL; ln = Lst_Adv(ln)) { job = (Job *)Lst_Datum(ln); if (FD_ISSET(job->inPipe, readfdsp)) { JobDoOutput(job, false); nfds--; } } } free(readfdsp); } /*- *----------------------------------------------------------------------- * Job_Make -- * Start the creation of a target. Basically a front-end for * JobStart used by the Make module. * * Side Effects: * Another job is started. *----------------------------------------------------------------------- */ void Job_Make(GNode *gn) { (void)JobStart(gn, 0); } static void setup_signal(int sig) { if (signal(sig, SIG_IGN) != SIG_IGN) { (void)signal(sig, SigHandler); } } /*- *----------------------------------------------------------------------- * Job_Init -- * Initialize the process module * * Side Effects: * lists and counters are initialized *----------------------------------------------------------------------- */ void Job_Init(int maxproc) { Static_Lst_Init(&jobs); Static_Lst_Init(&stoppedJobs); maxJobs = maxproc; nJobs = 0; jobFull = false; aborting = 0; errors = 0; lastNode = NULL; if (maxJobs == 1) { /* * If only one job can run at a time, there's no need for a * banner, no is there? */ targFmt = ""; } else { targFmt = TARG_FMT; } /* * Catch the four signals that POSIX specifies if they aren't ignored. * JobPassSig will take care of calling JobInterrupt if appropriate. */ setup_signal(SIGINT); setup_signal(SIGHUP); setup_signal(SIGQUIT); setup_signal(SIGTERM); /* * There are additional signals that need to be caught and passed if * either the export system wants to be told directly of signals or if * we're giving each job its own process group (since then it won't get * signals from the terminal driver as we own the terminal) */ #if defined(USE_PGRP) setup_signal(SIGTSTP); setup_signal(SIGTTOU); setup_signal(SIGTTIN); setup_signal(SIGWINCH); #endif if ((begin_node->type & OP_DUMMY) == 0) { JobStart(begin_node, JOB_SPECIAL); while (nJobs) { Job_CatchOutput(); Job_CatchChildren(); } } } /*- *----------------------------------------------------------------------- * Job_Full -- * See if the job table is full. It is considered full if it is OR * if we are in the process of aborting OR if we have * reached/exceeded our local quota. This prevents any more jobs * from starting up. * * Results: * true if the job table is full, false otherwise *----------------------------------------------------------------------- */ bool Job_Full(void) { return aborting || jobFull; } /*- *----------------------------------------------------------------------- * Job_Empty -- * See if the job table is empty. Because the local concurrency may * be set to 0, it is possible for the job table to become empty, * while the list of stoppedJobs remains non-empty. In such a case, * we want to restart as many jobs as we can. * * Results: * true if it is. false if it ain't. * ----------------------------------------------------------------------- */ bool Job_Empty(void) { if (nJobs == 0) { if (!Lst_IsEmpty(&stoppedJobs) && !aborting) { /* * The job table is obviously not full if it has no * jobs in it...Try and restart the stopped jobs. */ jobFull = false; JobRestartJobs(); return false; } else { return true; } } else { return false; } } /*- *----------------------------------------------------------------------- * JobInterrupt -- * Handle the receipt of an interrupt. * * Side Effects: * All children are killed. Another job will be started if the * .INTERRUPT target was given. *----------------------------------------------------------------------- */ static void JobInterrupt(int runINTERRUPT, /* Non-zero if commands for the .INTERRUPT * target should be executed */ int signo) /* signal received */ { LstNode ln; /* element in job table */ Job *job; /* job descriptor in that element */ aborting = ABORT_INTERRUPT; for (ln = Lst_First(&jobs); ln != NULL; ln = Lst_Adv(ln)) { job = (Job *)Lst_Datum(ln); if (!Targ_Precious(job->node)) { const char *file = job->node->path == NULL ? job->node->name : job->node->path; if (!noExecute && eunlink(file) != -1) { Error("*** %s removed", file); } } if (job->pid) { debug_printf("JobInterrupt passing signal to " "child %ld.\n", (long)job->pid); KILL(job->pid, signo); } } if (runINTERRUPT && !touchFlag) { if ((interrupt_node->type & OP_DUMMY) == 0) { ignoreErrors = false; JobStart(interrupt_node, JOB_IGNDOTS); while (nJobs) { Job_CatchOutput(); Job_CatchChildren(); } } } exit(signo); } /* *----------------------------------------------------------------------- * Job_Finish -- * Do final processing such as the running of the commands * attached to the .END target. * * Results: * Number of errors reported. * *----------------------------------------------------------------------- */ int Job_Finish(void) { if (end_node != NULL && !Lst_IsEmpty(&end_node->commands)) { if (errors) { Error("Errors reported so .END ignored"); } else { JobStart(end_node, JOB_SPECIAL | JOB_IGNDOTS); while (nJobs) { Job_CatchOutput(); Job_CatchChildren(); } } } return errors; } #ifdef CLEANUP void Job_End(void) { } #endif /*- *----------------------------------------------------------------------- * Job_Wait -- * Waits for all running jobs to finish and returns. Sets 'aborting' * to ABORT_WAIT to prevent other jobs from starting. * * Side Effects: * Currently running jobs finish. * *----------------------------------------------------------------------- */ void Job_Wait(void) { aborting = ABORT_WAIT; while (nJobs != 0) { Job_CatchOutput(); Job_CatchChildren(); } aborting = 0; } /*- *----------------------------------------------------------------------- * Job_AbortAll -- * Abort all currently running jobs without handling output or anything. * This function is to be called only in the event of a major * error. Most definitely NOT to be called from JobInterrupt. * * Side Effects: * All children are killed, not just the firstborn *----------------------------------------------------------------------- */ void Job_AbortAll(void) { LstNode ln; /* element in job table */ Job *job; /* the job descriptor in that element */ int foo; aborting = ABORT_ERROR; if (nJobs) { for (ln = Lst_First(&jobs); ln != NULL; ln = Lst_Adv(ln)) { job = (Job *)Lst_Datum(ln); /* * kill the child process with increasingly drastic * signals to make darn sure it's dead. */ KILL(job->pid, SIGINT); KILL(job->pid, SIGKILL); } } /* * Catch as many children as want to report in at first, then give up */ while (waitpid(-1, &foo, WNOHANG) > 0) continue; } /*- *----------------------------------------------------------------------- * JobRestartJobs -- * Tries to restart stopped jobs if there are slots available. * Note that this tries to restart them regardless of pending errors. * It's not good to leave stopped jobs lying around! * * Side Effects: * Resumes(and possibly migrates) jobs. *----------------------------------------------------------------------- */ static void JobRestartJobs(void) { Job *job; while (!jobFull && (job = (Job *)Lst_DeQueue(&stoppedJobs)) != NULL) { debug_printf("Job queue is not full. " "Restarting a stopped job.\n"); JobRestart(job); } }