/*- * Copyright (c) 1988, 1989, 1990, 1993 * The Regents of the University of California. All rights reserved. * 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. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by the University of * California, Berkeley and its contributors. * 4. 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 8.2 (Berkeley) 3/19/94 */ #include __FBSDID("$FreeBSD$"); #ifndef OLD_JOKE #define OLD_JOKE 0 #endif /* OLD_JOKE */ /*- * 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. * Its single argument is TRUE if the function * should block waiting for a child to terminate. * * 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 intialize 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_Full Return TRUE if the job table is filled. * * Job_Empty Return TRUE if the job table is completely * empty. * * Job_ParseShell Given the line following a .SHELL target, parse * the line as a shell specification. Returns * FAILURE if the spec was incorrect. * * 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_CheckCommands Verify that the commands for a target are * ok. Provide them if necessary and possible. * * Job_Touch Update a target without really updating it. * * Job_Wait Wait for all currently-running jobs to finish. */ #include #include #include #ifdef USE_KQUEUE #include #endif #include #include #include #include #include #include #include #include #include #include "arch.h" #include "compat.h" #include "dir.h" #include "globals.h" #include "GNode.h" #include "job.h" #include "make.h" #include "parse.h" #include "pathnames.h" #include "str.h" #include "targ.h" #include "util.h" #include "var.h" #define STATIC static /* * 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 */ /* * XXX: Avoid SunOS bug... FILENO() is fp->_file, and file * is a char! So when we go above 127 we turn negative! */ #define FILENO(a) ((unsigned)fileno(a)) /* * post-make command processing. The node postCommands is really just the * .END target but we keep it around to avoid having to search for it * all the time. */ static GNode *postCommands; /* node containing commands to execute when * everything else is done */ 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 */ /* * tfile is used to build temp file names to store shell commands to * execute. */ static char tfile[sizeof(TMPPAT)]; /* * Descriptions for various shells. */ static const DEF_SHELL_STRUCT(CShell, const) shells[] = { /* * CSH description. The csh can do echo control by playing * with the setting of the 'echo' shell variable. Sadly, * however, it is unable to do error control nicely. */ { "csh", TRUE, "unset verbose", "set verbose", "unset verbose", 13, FALSE, "echo \"%s\"\n", "csh -c \"%s || exit 0\"", "v", "e", }, /* * SH description. Echo control is also possible and, under * sun UNIX anyway, one can even control error checking. */ { "sh", TRUE, "set -", "set -v", "set -", 5, TRUE, "set -e", "set +e", #ifdef OLDBOURNESHELL FALSE, "echo \"%s\"\n", "sh -c '%s || exit 0'\n", #endif "v", "e", }, /* * KSH description. The Korn shell has a superset of * the Bourne shell's functionality. */ { "ksh", TRUE, "set -", "set -v", "set -", 5, TRUE, "set -e", "set +e", "v", "e", }, }; static Shell *commandShell = NULL; /* this is the shell to which we pass * all commands in the Makefile. It is * set by the Job_ParseShell function */ char *shellPath = NULL, /* full pathname of executable image */ *shellName = NULL; /* last component of shell */ int maxJobs; /* The most children we can run at once */ STATIC int nJobs; /* The number of children currently running */ /* The structures that describe them */ STATIC Lst jobs = Lst_Initializer(jobs); STATIC Boolean jobFull; /* Flag to tell when the job table is full. It * is set TRUE when (1) the total number of * running jobs equals the maximum allowed */ #ifdef USE_KQUEUE static int kqfd; /* File descriptor obtained by kqueue() */ #else static fd_set outputs; /* Set of descriptors of pipes connected to * the output channels of children */ #endif STATIC GNode *lastNode; /* The node for which output was most recently * produced. */ STATIC const 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) \ fprintf(fp, targFmt, gn->name); /* * When JobStart attempts to run a job but isn't allowed to * or when Job_CatchChildren detects a job that has * been stopped somehow, the job is placed on the stoppedJobs queue to be run * when the next job finishes. * * Lst of Job structures describing jobs that were stopped due to * concurrency limits or externally */ STATIC Lst stoppedJobs = Lst_Initializer(stoppedJobs); STATIC int fifoFd; /* Fd of our job fifo */ STATIC char fifoName[] = "/tmp/make_fifo_XXXXXXXXX"; STATIC int fifoMaster; static sig_atomic_t interrupted; #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 int JobCondPassSig(void *, void *); static void JobPassSig(int); static int JobPrintCommand(void *, void *); static int 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, Job *); static char *JobOutput(Job *, char *, char *, int); static void JobDoOutput(Job *, Boolean); static Shell *JobMatchShell(const char *); static void JobInterrupt(int, int); static void JobRestartJobs(void); /* * JobCatchSignal * * Got a signal. Set global variables and hope that someone will * handle it. */ static void JobCatchSig(int signo) { interrupted = signo; } /*- *----------------------------------------------------------------------- * JobCondPassSig -- * Pass a signal to a job if USE_PGRP is defined. * * Results: * === 0 * * Side Effects: * None, except the job may bite it. * *----------------------------------------------------------------------- */ static int JobCondPassSig(void *jobp, void *signop) { Job *job = jobp; int signo = *(int *)signop; DEBUGF(JOB, ("JobCondPassSig passing signal %d to child %d.\n", signo, job->pid)); KILL(job->pid, signo); return (0); } /*- *----------------------------------------------------------------------- * JobPassSig -- * Pass a signal on to all local jobs if * USE_PGRP is defined, then die ourselves. * * Results: * None. * * Side Effects: * We die by the same signal. * *----------------------------------------------------------------------- */ static void JobPassSig(int signo) { sigset_t nmask, omask; struct sigaction act; sigemptyset(&nmask); sigaddset(&nmask, signo); sigprocmask(SIG_SETMASK, &nmask, &omask); DEBUGF(JOB, ("JobPassSig(%d) called.\n", signo)); Lst_ForEach(&jobs, JobCondPassSig, &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) { signo = SIGINT; } /* * 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. * XXX this comment seems wrong. */ act.sa_handler = SIG_DFL; sigemptyset(&act.sa_mask); act.sa_flags = 0; sigaction(signo, &act, NULL); DEBUGF(JOB, ("JobPassSig passing signal to self, mask = %x.\n", ~0 & ~(1 << (signo - 1)))); signal(signo, SIG_DFL); KILL(getpid(), signo); signo = SIGCONT; Lst_ForEach(&jobs, JobCondPassSig, &signo); sigprocmask(SIG_SETMASK, &omask, NULL); sigprocmask(SIG_SETMASK, &omask, NULL); act.sa_handler = JobPassSig; 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 * * Side Effects: * None *----------------------------------------------------------------------- */ static int JobCmpPid(const void *job, const void *pid) { return (*(const int *)pid - ((const Job *)job)->pid); } /*- *----------------------------------------------------------------------- * 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 postCommands * node and executed by Job_Finish when all things are done. * This function is called from JobStart via Lst_ForEach. * * Results: * Always 0, 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(void *cmdp, void *jobp) { Boolean noSpecials; /* true if we shouldn't worry about * inserting special commands into * the input stream. */ Boolean shutUp = FALSE; /* true if we put a no echo command * into the command file */ Boolean errOff = FALSE; /* true if we turned error checking * off before printing the command * and need to turn it back on */ const char *cmdTemplate; /* Template to use when printing the * command */ char *cmdStart; /* Start of expanded command */ LstNode *cmdNode; /* Node for replacing the command */ char *cmd = cmdp; 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(Lst_Member(&job->node->commands, cmd)); return (1); } return (0); } #define DBPRINTF(fmt, arg) \ DEBUGF(JOB, (fmt, arg)); \ fprintf(job->cmdFILE, fmt, arg); \ fflush(job->cmdFILE); numCommands += 1; /* * For debugging, we replace each command with the result of expanding * the variables in the command. */ cmdNode = Lst_Member(&job->node->commands, cmd); cmdStart = cmd = Var_Subst(NULL, cmd, job->node, FALSE); Lst_Replace(cmdNode, cmdStart); cmdTemplate = "%s\n"; /* * Check for leading @', -' or +'s to control echoing, error checking, * and execution on -n. */ while (*cmd == '@' || *cmd == '-' || *cmd == '+') { switch (*cmd) { case '@': shutUp = DEBUG(LOUD) ? FALSE : TRUE; break; case '-': errOff = TRUE; break; case '+': if (noSpecials) { /* * We're not actually exececuting anything... * but this one needs to be - use compat mode just for it. */ Compat_RunCommand(cmdp, job->node); return (0); } break; } cmd++; } while (isspace((unsigned char)*cmd)) cmd++; if (shutUp) { if (!(job->flags & JOB_SILENT) && !noSpecials && commandShell->hasEchoCtl) { DBPRINTF("%s\n", commandShell->echoOff); } else { shutUp = FALSE; } } if (errOff) { if ( !(job->flags & JOB_IGNERR) && !noSpecials) { if (commandShell->hasErrCtl) { /* * 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 && commandShell->hasEchoCtl) { DBPRINTF("%s\n", commandShell->echoOff); DBPRINTF("%s\n", commandShell->ignErr); DBPRINTF("%s\n", commandShell->echoOn); } else { DBPRINTF("%s\n", commandShell->ignErr); } } else if (commandShell->ignErr && (*commandShell->ignErr != '\0')) { /* * The shell has no error control, so we need to be * weird to get it to ignore any errors from the command. * If echoing is turned on, we turn it off and use the * errCheck template to echo the command. Leave echoing * off so the user doesn't see the weirdness we go through * to ignore errors. Set cmdTemplate to use the weirdness * instead of the simple "%s\n" template. */ if (!(job->flags & JOB_SILENT) && !shutUp && commandShell->hasEchoCtl) { DBPRINTF("%s\n", commandShell->echoOff); DBPRINTF(commandShell->errCheck, cmd); shutUp = TRUE; } cmdTemplate = commandShell->ignErr; /* * The error ignoration (hee hee) is already taken care * of by the ignErr template, so pretend error checking * is still on. */ errOff = FALSE; } else { errOff = FALSE; } } else { errOff = FALSE; } } DBPRINTF(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) && commandShell->hasEchoCtl) { DBPRINTF("%s\n", commandShell->echoOff); shutUp = TRUE; } DBPRINTF("%s\n", commandShell->errCheck); } if (shutUp) { DBPRINTF("%s\n", commandShell->echoOn); } return (0); } /*- *----------------------------------------------------------------------- * JobSaveCommand -- * Save a command to be executed when everything else is done. * Callback function for JobFinish... * * Results: * Always returns 0 * * Side Effects: * The command is tacked onto the end of postCommands's commands list. * *----------------------------------------------------------------------- */ static int JobSaveCommand(void *cmd, void *gn) { cmd = Var_Subst(NULL, cmd, gn, FALSE); Lst_AtEnd(&postCommands->commands, cmd); return (0); } /*- *----------------------------------------------------------------------- * JobClose -- * Called to close both input and output pipes when a job is finished. * * Results: * Nada * * Side Effects: * The file descriptors associated with the job are closed. * *----------------------------------------------------------------------- */ static void JobClose(Job *job) { if (usePipes) { #if !defined(USE_KQUEUE) FD_CLR(job->inPipe, &outputs); #endif if (job->outPipe != job->inPipe) { close(job->outPipe); } JobDoOutput(job, TRUE); close(job->inPipe); } else { close(job->outFd); JobDoOutput(job, TRUE); } } /*- *----------------------------------------------------------------------- * 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. * * Results: * None * * Side Effects: * Some nodes may be put on the toBeMade queue. * Final commands for the job are placed on postCommands. * * 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, int *status) { Boolean 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) { 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; if (compatMake && !usePipes && (job->flags & JOB_IGNERR)) { /* * If output is going to a file and this job is ignoring * errors, arrange to have the exit status sent to the * output file as well. */ out = fdopen(job->outFd, "w"); if (out == NULL) Punt("Cannot fdopen"); } else { out = stdout; } if (WIFEXITED(*status)) { DEBUGF(JOB, ("Process %d exited.\n", job->pid)); if (WEXITSTATUS(*status) != 0) { if (usePipes && job->node != lastNode) { MESSAGE(out, job->node); lastNode = job->node; } 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 (usePipes && job->node != lastNode) { MESSAGE(out, job->node); lastNode = job->node; } fprintf(out, "*** Completed successfully\n"); } } else if (WIFSTOPPED(*status)) { DEBUGF(JOB, ("Process %d stopped.\n", job->pid)); if (usePipes && job->node != lastNode) { MESSAGE(out, job->node); lastNode = job->node; } fprintf(out, "*** Stopped -- signal %d\n", WSTOPSIG(*status)); job->flags |= JOB_RESUME; Lst_AtEnd(&stoppedJobs, job); 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 (usePipes && job->node != lastNode) { MESSAGE(out, job->node); lastNode = job->node; } fprintf(out, "*** Continued\n"); } if (!(job->flags & JOB_CONTINUING)) { DEBUGF(JOB, ("Warning: process %d was not continuing.\n", job->pid)); #ifdef notdef /* * 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 += 1; DEBUGF(JOB, ("Process %d is continuing locally.\n", job->pid)); if (nJobs == maxJobs) { jobFull = TRUE; DEBUGF(JOB, ("Job queue is full.\n")); } fflush(out); return; } else { if (usePipes && job->node != lastNode) { MESSAGE(out, job->node); lastNode = job->node; } fprintf(out, "*** Signal %d\n", WTERMSIG(*status)); } fflush(out); } /* * Now handle the -B-mode stuff. If the beast still isn't finished, * try and restart the job on the next command. If JobStart says it's * ok, it's ok. If there's an error, this puppy is done. */ if (compatMake && WIFEXITED(*status) && Lst_Succ(job->node->compat_command) != NULL) { switch (JobStart(job->node, job->flags & JOB_IGNDOTS, job)) { case JOB_RUNNING: done = FALSE; break; case JOB_ERROR: done = TRUE; W_SETEXITSTATUS(status, 1); break; case JOB_FINISHED: /* * If we got back a JOB_FINISHED code, JobStart has already * called Make_Update and freed the job descriptor. We set * done to false here to avoid fake cycles and double frees. * JobStart needs to do the update so we can proceed up the * graph when given the -n flag.. */ done = FALSE; break; default: break; } } else { 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. */ if (job->tailCmds != NULL) { Lst_ForEachFrom(&job->node->commands, job->tailCmds, JobSaveCommand, job->node); } job->node->made = MADE; Make_Update(job->node); free(job); } else if (*status != 0) { errors += 1; 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); } /*- *----------------------------------------------------------------------- * Job_Touch -- * Touch the given target. Called by JobStart when the -t flag was * given. Prints messages unless told to be silent. * * Results: * None * * Side Effects: * The data modification of the file is changed. In addition, if the * file did not exist, it is created. *----------------------------------------------------------------------- */ void Job_Touch(GNode *gn, Boolean silent) { int streamID; /* ID of stream opened to do the touch */ struct utimbuf times; /* Times for utime() call */ if (gn->type & (OP_JOIN | OP_USE | OP_EXEC | OP_OPTIONAL)) { /* * .JOIN, .USE, .ZEROTIME and .OPTIONAL targets are "virtual" targets * and, as such, shouldn't really be created. */ return; } if (!silent) { fprintf(stdout, "touch %s\n", gn->name); fflush(stdout); } if (noExecute) { return; } if (gn->type & OP_ARCHV) { Arch_Touch(gn); } else if (gn->type & OP_LIB) { Arch_TouchLib(gn); } else { char *file = gn->path ? gn->path : gn->name; times.actime = times.modtime = now; if (utime(file, ×) < 0){ streamID = open(file, O_RDWR | O_CREAT, 0666); if (streamID >= 0) { char c; /* * Read and write a byte to the file to change the * modification time, then close the file. */ if (read(streamID, &c, 1) == 1) { lseek(streamID, (off_t)0, SEEK_SET); write(streamID, &c, 1); } close(streamID); } else { fprintf(stdout, "*** couldn't touch %s: %s", file, strerror(errno)); fflush(stdout); } } } } /*- *----------------------------------------------------------------------- * Job_CheckCommands -- * Make sure the given node has all the commands it needs. * * Results: * TRUE if the commands list is/was ok. * * Side Effects: * The node will have commands from the .DEFAULT rule added to it * if it needs them. *----------------------------------------------------------------------- */ Boolean Job_CheckCommands(GNode *gn, void (*abortProc)(const char *, ...)) { if (OP_NOP(gn->type) && Lst_IsEmpty(&gn->commands) && (gn->type & OP_LIB) == 0) { /* * No commands. Look for .DEFAULT rule from which we might infer * commands */ if ((DEFAULT != NULL) && !Lst_IsEmpty(&DEFAULT->commands)) { char *p1; /* * Make only looks for a .DEFAULT if the node was never the * target of an operator, so that's what we do too. If * a .DEFAULT was given, we substitute its commands for gn's * commands and set the IMPSRC variable to be the target's name * The DEFAULT node acts like a transformation rule, in that * gn also inherits any attributes or sources attached to * .DEFAULT itself. */ Make_HandleUse(DEFAULT, gn); Var_Set(IMPSRC, Var_Value(TARGET, gn, &p1), gn); free(p1); } else if (Dir_MTime(gn) == 0) { /* * The node wasn't the target of an operator we have no .DEFAULT * rule to go on and the target doesn't already exist. There's * nothing more we can do for this branch. If the -k flag wasn't * given, we stop in our tracks, otherwise we just don't update * this node's parents so they never get examined. */ static const char msg[] = "make: don't know how to make"; if (gn->type & OP_OPTIONAL) { fprintf(stdout, "%s %s(ignored)\n", msg, gn->name); fflush(stdout); } else if (keepgoing) { fprintf(stdout, "%s %s(continuing)\n", msg, gn->name); fflush(stdout); return (FALSE); } else { #if OLD_JOKE if (strcmp(gn->name,"love") == 0) (*abortProc)("Not war."); else #endif (*abortProc)("%s %s. Stop", msg, gn->name); return (FALSE); } } } return (TRUE); } /*- *----------------------------------------------------------------------- * JobExec -- * Execute the shell for the given job. Called from JobStart and * JobRestart. * * Results: * None. * * 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) { int cpid; /* ID of new child */ if (DEBUG(JOB)) { int i; DEBUGF(JOB, ("Running %s\n", job->node->name)); DEBUGF(JOB, ("\tCommand: ")); for (i = 0; argv[i] != NULL; i++) { DEBUGF(JOB, ("%s ", argv[i])); } DEBUGF(JOB, ("\n")); } /* * 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_FIRST) && !(job->flags & JOB_SILENT)) { MESSAGE(stdout, job->node); lastNode = job->node; } if ((cpid = vfork()) == -1) { Punt("Cannot fork"); } else if (cpid == 0) { if (fifoFd >= 0) close(fifoFd); /* * 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: %s", strerror(errno)); fcntl(0, F_SETFD, 0); lseek(0, (off_t)0, SEEK_SET); if (usePipes) { /* * 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: %s", strerror(errno)); } else { /* * We're capturing output in a file, so we duplicate the * descriptor to the temporary file into the standard * output. */ if (dup2(job->outFd, 1) == -1) Punt("Cannot dup2: %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. */ fcntl(1, F_SETFD, 0); if (dup2(1, 2) == -1) Punt("Cannot dup2: %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) setsid(); # else setpgid(0, getpid()); # endif #endif /* USE_PGRP */ execv(shellPath, argv); write(STDERR_FILENO, "Could not execute shell\n", sizeof("Could not execute shell")); _exit(1); } else { job->pid = cpid; if (usePipes && (job->flags & JOB_FIRST) ) { /* * The first time a job is run for a node, we set the current * position in the buffer to the beginning and mark another * stream to watch in the outputs mask */ #ifdef USE_KQUEUE struct kevent kev[2]; #endif job->curPos = 0; #if defined(USE_KQUEUE) EV_SET(&kev[0], job->inPipe, EVFILT_READ, EV_ADD, 0, 0, job); EV_SET(&kev[1], job->pid, EVFILT_PROC, EV_ADD | EV_ONESHOT, NOTE_EXIT, 0, NULL); if (kevent(kqfd, kev, 2, NULL, 0, NULL) != 0) { /* kevent() will fail if the job is already finished */ if (errno != EINTR && errno != EBADF && errno != ESRCH) Punt("kevent: %s", strerror(errno)); } #else FD_SET(job->inPipe, &outputs); #endif /* USE_KQUEUE */ } if (job->cmdFILE != NULL && job->cmdFILE != stdout) { fclose(job->cmdFILE); job->cmdFILE = NULL; } } /* * Now the job is actually running, add it to the table. */ nJobs += 1; Lst_AtEnd(&jobs, job); if (nJobs == maxJobs) { jobFull = TRUE; } } /*- *----------------------------------------------------------------------- * JobMakeArgv -- * Create the argv needed to execute the shell for a given job. * * * Results: * * Side Effects: * *----------------------------------------------------------------------- */ static void JobMakeArgv(Job *job, char **argv) { int argc; static char args[10]; /* For merged arguments */ argv[0] = shellName; argc = 1; if ((commandShell->exit && (*commandShell->exit != '-')) || (commandShell->echo && (*commandShell->echo != '-'))) { /* * At least one of the flags doesn't have a minus before it, so * merge them together. Have to do this because the *(&(@*#*&#$# * Bourne shell thinks its second argument is a file to source. * Grrrr. Note the ten-character limitation on the combined arguments. */ sprintf(args, "-%s%s", ((job->flags & JOB_IGNERR) ? "" : (commandShell->exit ? commandShell->exit : "")), ((job->flags & JOB_SILENT) ? "" : (commandShell->echo ? commandShell->echo : ""))); if (args[1]) { argv[argc] = args; argc++; } } else { if (!(job->flags & JOB_IGNERR) && commandShell->exit) { argv[argc] = commandShell->exit; argc++; } if (!(job->flags & JOB_SILENT) && commandShell->echo) { argv[argc] = commandShell->echo; argc++; } } argv[argc] = NULL; } /*- *----------------------------------------------------------------------- * JobRestart -- * Restart a job that stopped for some reason. * * Results: * None. * * 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); DEBUGF(JOB, ("Restarting %s...", job->node->name)); 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 */ DEBUGF(JOB, ("holding\n")); Lst_AtFront(&stoppedJobs, (void *)job); jobFull = TRUE; DEBUGF(JOB, ("Job queue is full.\n")); return; } else { /* * Job may be run locally. */ DEBUGF(JOB, ("running locally\n")); } JobExec(job, argv); } else { /* * The job has stopped and needs to be restarted. Why it stopped, * we don't know... */ DEBUGF(JOB, ("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 the * job must be run and maxJobs is 0), it's ok to resume it. */ Boolean 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); DEBUGF(JOB, ("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. */ DEBUGF(JOB, ("table full\n")); Lst_AtFront(&stoppedJobs, (void *)job); jobFull = TRUE; DEBUGF(JOB, ("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, int flags, Job *previous) { Job *job; /* new job descriptor */ char *argv[4]; /* Argument vector to shell */ Boolean cmdsOK; /* true if the nodes commands were all right */ Boolean noExec; /* Set true if we decide not to run the job */ int tfd; /* File descriptor for temp file */ if (interrupted) { JobPassSig(interrupted); return (JOB_ERROR); } if (previous != NULL) { previous->flags &= ~(JOB_FIRST|JOB_IGNERR|JOB_SILENT); job = previous; } else { job = emalloc(sizeof(Job)); flags |= JOB_FIRST; } 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 = 0; if (Targ_Ignore(gn)) { job->flags |= JOB_IGNERR; } if (Targ_Silent(gn)) { job->flags |= JOB_SILENT; } job->flags |= flags; /* * Check the commands now so any attributes from .DEFAULT have a chance * to migrate to the node */ if (!compatMake && job->flags & JOB_FIRST) { cmdsOK = Job_CheckCommands(gn, Error); } else { cmdsOK = TRUE; } /* * 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(); } strcpy(tfile, TMPPAT); if ((tfd = mkstemp(tfile)) == -1) Punt("Cannot create temp file: %s", strerror(errno)); job->cmdFILE = fdopen(tfd, "w+"); eunlink(tfile); if (job->cmdFILE == NULL) { close(tfd); Punt("Could not open %s", tfile); } fcntl(FILENO(job->cmdFILE), F_SETFD, 1); /* * Send the commands to the command file, flush all its buffers then * rewind and remove the thing. */ noExec = FALSE; /* * used to be backwards; replace when start doing multiple commands * per shell. */ if (compatMake) { /* * Be compatible: If this is the first time for this node, * verify its commands are ok and open the commands list for * sequential access by later invocations of JobStart. * Once that is done, we take the next command off the list * and print it to the command file. If the command was an * ellipsis, note that there's nothing more to execute. */ if (job->flags & JOB_FIRST) gn->compat_command = Lst_First(&gn->commands); else gn->compat_command = Lst_Succ(gn->compat_command); if (gn->compat_command == NULL || JobPrintCommand(Lst_Datum(gn->compat_command), job)) noExec = TRUE; if (noExec && !(job->flags & JOB_FIRST)) { /* * If we're not going to execute anything, the job * is done and we need to close down the various * file descriptors we've opened for output, then * call JobDoOutput to catch the final characters or * send the file to the screen... Note that the i/o streams * are only open if this isn't the first job. * Note also that this could not be done in * Job_CatchChildren b/c it wasn't clear if there were * more commands to execute or not... */ JobClose(job); } } else { /* * We can do all the commands at once. hooray for sanity */ numCommands = 0; Lst_ForEach(&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_ForEach(&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) fclose(job->cmdFILE); } else { 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) { if (job->tailCmds != NULL) { Lst_ForEachFrom(&job->node->commands, job->tailCmds, JobSaveCommand, job->node); } job->node->made = MADE; Make_Update(job->node); } free(job); return(JOB_FINISHED); } else { free(job); return(JOB_ERROR); } } else { 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); /* * If we're using pipes to catch output, create the pipe by which we'll * get the shell's output. If we're using files, print out that we're * starting a job and then set up its temporary-file name. */ if (!compatMake || (job->flags & JOB_FIRST)) { if (usePipes) { int fd[2]; if (pipe(fd) == -1) Punt("Cannot create pipe: %s", strerror(errno)); job->inPipe = fd[0]; job->outPipe = fd[1]; fcntl(job->inPipe, F_SETFD, 1); fcntl(job->outPipe, F_SETFD, 1); } else { fprintf(stdout, "Remaking `%s'\n", gn->name); fflush(stdout); strcpy(job->outFile, TMPPAT); if ((job->outFd = mkstemp(job->outFile)) == -1) Punt("cannot create temp file: %s", strerror(errno)); fcntl(job->outFd, F_SETFD, 1); } } if ((nJobs >= maxJobs) && !(job->flags & JOB_SPECIAL) && (maxJobs != 0)) { /* * We've hit the limit of concurrency, so put the job on hold until * some other job finishes. Note that the special jobs (.BEGIN, * .INTERRUPT and .END) may be run even when the limit has been reached * (e.g. when maxJobs == 0). */ jobFull = TRUE; DEBUGF(JOB, ("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; DEBUGF(JOB, ("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; if (commandShell->noPrint) { ecp = strstr(cp, commandShell->noPrint); 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. */ fprintf(stdout, "%s", cp); fflush(stdout); } cp = ecp + commandShell->noPLen; 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, commandShell->noPrint); } else { return (cp); } } } return (cp); } /*- *----------------------------------------------------------------------- * JobDoOutput -- * This function is called at different times depending on * whether the user has specified that output is to be collected * via pipes or temporary files. In the former case, we are 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. * If output has been collected in a temporary file, we open the * file and read it line by line, transfering it to our own * output channel until the file is empty. At which point we * remove the temporary file. * In both cases, however, we 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. * * Results: * None * * Side Effects: * curPos may be shifted as may the contents of outBuf. *----------------------------------------------------------------------- */ STATIC void JobDoOutput(Job *job, Boolean finish) { Boolean gotNL = FALSE; /* true if got a newline */ Boolean 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 */ FILE *oFILE; /* Stream pointer to shell's output file */ char inLine[132]; if (usePipes) { /* * 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); /* * Check for interrupt here too, because the above read may block * when the child process is stopped. In this case the interrupt * will unblock it (we don't use SA_RESTART). */ if (interrupted) JobPassSig(interrupted); if (nRead < 0) { DEBUGF(JOB, ("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') { /* * Why? */ 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; } fprintf(stdout, "%s%s", cp, gotNL ? "\n" : ""); fflush(stdout); } } if (i < max - 1) { /* shift the remaining characters down */ 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; } } else { /* * We've been called to retrieve the output of the job from the * temporary file where it's been squirreled away. This consists of * opening the file, reading the output line by line, being sure not * to print the noPrint line for the shell we used, then close and * remove the temporary file. Very simple. * * Change to read in blocks and do FindSubString type things as for * pipes? That would allow for "@echo -n..." */ oFILE = fopen(job->outFile, "r"); if (oFILE != NULL) { fprintf(stdout, "Results of making %s:\n", job->node->name); fflush(stdout); while (fgets(inLine, sizeof(inLine), oFILE) != NULL) { char *cp, *endp, *oendp; cp = inLine; oendp = endp = inLine + strlen(inLine); if (endp[-1] == '\n') { *--endp = '\0'; } cp = JobOutput(job, inLine, endp, 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. */ fprintf(stdout, "%s", cp); fflush(stdout); if (endp != oendp) { fprintf(stdout, "\n"); fflush(stdout); } } fclose(oFILE); eunlink(job->outFile); } } } /*- *----------------------------------------------------------------------- * Job_CatchChildren -- * Handle the exit of a child. Called from Make_Make. * * Results: * none. * * 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(Boolean block) { int 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; } for (;;) { pid = waitpid((pid_t)-1, &status, (block ? 0 : WNOHANG) | WUNTRACED); if (pid <= 0) break; DEBUGF(JOB, ("Process %d exited or stopped.\n", pid)); jnode = Lst_Find(&jobs, &pid, JobCmpPid); if (jnode == NULL) { if (WIFSIGNALED(status) && (WTERMSIG(status) == SIGCONT)) { jnode = Lst_Find(&stoppedJobs, &pid, JobCmpPid); if (jnode == NULL) { Error("Resumed child (%d) not in table", pid); continue; } job = Lst_Datum(jnode); Lst_Remove(&stoppedJobs, jnode); } else { Error("Child (%d) not in table?", pid); continue; } } else { job = Lst_Datum(jnode); Lst_Remove(&jobs, jnode); nJobs -= 1; if (fifoFd >= 0 && maxJobs > 1) { write(fifoFd, "+", 1); maxJobs--; if (nJobs >= maxJobs) jobFull = TRUE; else jobFull = FALSE; } else { DEBUGF(JOB, ("Job queue is no longer full.\n")); jobFull = FALSE; } } JobFinish(job, &status); } if (interrupted) JobPassSig(interrupted); } /*- *----------------------------------------------------------------------- * 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. * * Results: * None * * Side Effects: * Output is read from pipes if we're piping. * ----------------------------------------------------------------------- */ void #ifdef USE_KQUEUE Job_CatchOutput(int flag __unused) #else Job_CatchOutput(int flag) #endif { int nfds; #ifdef USE_KQUEUE #define KEV_SIZE 4 struct kevent kev[KEV_SIZE]; int i; #else struct timeval timeout; fd_set readfds; LstNode *ln; Job *job; #endif fflush(stdout); if (usePipes) { #ifdef USE_KQUEUE if ((nfds = kevent(kqfd, NULL, 0, kev, KEV_SIZE, NULL)) == -1) { if (errno != EINTR) Punt("kevent: %s", strerror(errno)); if (interrupted) JobPassSig(interrupted); } else { for (i = 0; i < nfds; i++) { if (kev[i].flags & EV_ERROR) { warnc(kev[i].data, "kevent"); continue; } switch (kev[i].filter) { case EVFILT_READ: JobDoOutput(kev[i].udata, FALSE); break; case EVFILT_PROC: /* Just wake up and let Job_CatchChildren() collect the * terminated job. */ break; } } } #else readfds = outputs; timeout.tv_sec = SEL_SEC; timeout.tv_usec = SEL_USEC; if (flag && jobFull && fifoFd >= 0) FD_SET(fifoFd, &readfds); nfds = select(FD_SETSIZE, &readfds, (fd_set *)NULL, (fd_set *)NULL, &timeout); if (nfds <= 0) { if (interrupted) JobPassSig(interrupted); return; } if (fifoFd >= 0 && FD_ISSET(fifoFd, &readfds)) { if (--nfds <= 0) return; } for (ln = Lst_First(&jobs); nfds != 0 && ln != NULL; ln = Lst_Succ(ln)){ job = Lst_Datum(ln); if (FD_ISSET(job->inPipe, &readfds)) { JobDoOutput(job, FALSE); nfds -= 1; } } #endif /* !USE_KQUEUE */ } } /*- *----------------------------------------------------------------------- * Job_Make -- * Start the creation of a target. Basically a front-end for * JobStart used by the Make module. * * Results: * None. * * Side Effects: * Another job is started. * *----------------------------------------------------------------------- */ void Job_Make(GNode *gn) { JobStart(gn, 0, NULL); } /* * JobCopyShell: * * Make a new copy of the shell structure including a copy of the strings * in it. This also defaults some fields in case they are NULL. * * The function returns a pointer to the new shell structure otherwise. */ static Shell * JobCopyShell(const Shell *osh) { Shell *nsh; nsh = emalloc(sizeof(*nsh)); nsh->name = estrdup(osh->name); if (osh->echoOff != NULL) nsh->echoOff = estrdup(osh->echoOff); else nsh->echoOff = NULL; if (osh->echoOn != NULL) nsh->echoOn = estrdup(osh->echoOn); else nsh->echoOn = NULL; nsh->hasEchoCtl = osh->hasEchoCtl; if (osh->noPrint != NULL) nsh->noPrint = estrdup(osh->noPrint); else nsh->noPrint = NULL; nsh->noPLen = osh->noPLen; nsh->hasErrCtl = osh->hasErrCtl; if (osh->errCheck == NULL) nsh->errCheck = estrdup(""); else nsh->errCheck = estrdup(osh->errCheck); if (osh->ignErr == NULL) nsh->ignErr = estrdup("%s"); else nsh->ignErr = estrdup(osh->ignErr); if (osh->echo == NULL) nsh->echo = estrdup(""); else nsh->echo = estrdup(osh->echo); if (osh->exit == NULL) nsh->exit = estrdup(""); else nsh->exit = estrdup(osh->exit); return (nsh); } /* * JobFreeShell: * * Free a shell structure and all associated strings. */ static void JobFreeShell(Shell *sh) { if (sh != NULL) { free(sh->name); free(sh->echoOff); free(sh->echoOn); free(sh->noPrint); free(sh->errCheck); free(sh->ignErr); free(sh->echo); free(sh->exit); free(sh); } } void Shell_Init(void) { if (commandShell == NULL) commandShell = JobMatchShell(shells[DEFSHELL].name); if (shellPath == NULL) { /* * The user didn't specify a shell to use, so we are using the * default one... Both the absolute path and the last component * must be set. The last component is taken from the 'name' field * of the default shell description pointed-to by commandShell. * All default shells are located in _PATH_DEFSHELLDIR. */ shellName = commandShell->name; shellPath = str_concat(_PATH_DEFSHELLDIR, shellName, STR_ADDSLASH); } } /*- *----------------------------------------------------------------------- * Job_Init -- * Initialize the process module, given a maximum number of jobs. * * Results: * none * * Side Effects: * lists and counters are initialized *----------------------------------------------------------------------- */ void Job_Init(int maxproc) { GNode *begin; /* node for commands to do at the very start */ const char *env; struct sigaction sa; fifoFd = -1; env = getenv("MAKE_JOBS_FIFO"); if (env == NULL && maxproc > 1) { /* * We did not find the environment variable so we are the leader. * Create the fifo, open it, write one char per allowed job into * the pipe. */ mktemp(fifoName); if (!mkfifo(fifoName, 0600)) { fifoFd = open(fifoName, O_RDWR | O_NONBLOCK, 0); if (fifoFd >= 0) { fifoMaster = 1; fcntl(fifoFd, F_SETFL, O_NONBLOCK); env = fifoName; setenv("MAKE_JOBS_FIFO", env, 1); while (maxproc-- > 0) { write(fifoFd, "+", 1); } /* The master make does not get a magic token */ jobFull = TRUE; maxJobs = 0; } else { unlink(fifoName); env = NULL; } } } else if (env != NULL) { /* * We had the environment variable so we are a slave. * Open fifo and give ourselves a magic token which represents * the token our parent make has grabbed to start his make process. * Otherwise the sub-makes would gobble up tokens and the proper * number of tokens to specify to -j would depend on the depth of * the tree and the order of execution. */ fifoFd = open(env, O_RDWR, 0); if (fifoFd >= 0) { fcntl(fifoFd, F_SETFL, O_NONBLOCK); maxJobs = 1; jobFull = FALSE; } } if (fifoFd <= 0) { maxJobs = maxproc; jobFull = FALSE; } else { } nJobs = 0; aborting = 0; errors = 0; lastNode = NULL; if ((maxJobs == 1 && fifoFd < 0) || beVerbose == 0) { /* * If only one job can run at a time, there's no need for a banner, * no is there? */ targFmt = ""; } else { targFmt = TARG_FMT; } Shell_Init(); /* * Catch the four signals that POSIX specifies if they aren't ignored. * JobCatchSignal will just set global variables and hope someone * else is going to handle the interrupt. */ sa.sa_handler = JobCatchSig; sigemptyset(&sa.sa_mask); sa.sa_flags = 0; if (signal(SIGINT, SIG_IGN) != SIG_IGN) { sigaction(SIGINT, &sa, NULL); } if (signal(SIGHUP, SIG_IGN) != SIG_IGN) { sigaction(SIGHUP, &sa, NULL); } if (signal(SIGQUIT, SIG_IGN) != SIG_IGN) { sigaction(SIGQUIT, &sa, NULL); } if (signal(SIGTERM, SIG_IGN) != SIG_IGN) { sigaction(SIGTERM, &sa, NULL); } /* * 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) if (signal(SIGTSTP, SIG_IGN) != SIG_IGN) { sigaction(SIGTSTP, &sa, NULL); } if (signal(SIGTTOU, SIG_IGN) != SIG_IGN) { sigaction(SIGTTOU, &sa, NULL); } if (signal(SIGTTIN, SIG_IGN) != SIG_IGN) { sigaction(SIGTTIN, &sa, NULL); } if (signal(SIGWINCH, SIG_IGN) != SIG_IGN) { sigaction(SIGWINCH, &sa, NULL); } #endif #ifdef USE_KQUEUE if ((kqfd = kqueue()) == -1) { Punt("kqueue: %s", strerror(errno)); } #endif begin = Targ_FindNode(".BEGIN", TARG_NOCREATE); if (begin != NULL) { JobStart(begin, JOB_SPECIAL, (Job *)NULL); while (nJobs) { Job_CatchOutput(0); Job_CatchChildren(!usePipes); } } postCommands = Targ_FindNode(".END", TARG_CREATE); } /*- *----------------------------------------------------------------------- * 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 * Side Effects: * None. *----------------------------------------------------------------------- */ Boolean Job_Full(void) { char c; int i; if (aborting) return (aborting); if (fifoFd >= 0 && jobFull) { i = read(fifoFd, &c, 1); if (i > 0) { maxJobs++; jobFull = FALSE; } } return (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. * * Side Effects: * None. * * ----------------------------------------------------------------------- */ Boolean 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); } } /*- *----------------------------------------------------------------------- * JobMatchShell -- * Find a matching shell in 'shells' given its final component. * * Results: * A pointer to a freshly allocated Shell structure with a copy * of the static structure or NULL if no shell with the given name * is found. * * Side Effects: * None. * *----------------------------------------------------------------------- */ static Shell * JobMatchShell(const char *name) { const struct CShell *sh; /* Pointer into shells table */ struct Shell *nsh; for (sh = shells; sh < shells + sizeof(shells) / sizeof(shells[0]); sh++) if (strcmp(sh->name, name) == 0) break; if (sh == shells + sizeof(shells) / sizeof(shells[0])) return (NULL); /* make a copy */ nsh = emalloc(sizeof(*nsh)); nsh->name = estrdup(sh->name); nsh->echoOff = estrdup(sh->echoOff); nsh->echoOn = estrdup(sh->echoOn); nsh->hasEchoCtl = sh->hasEchoCtl; nsh->noPrint = estrdup(sh->noPrint); nsh->noPLen = sh->noPLen; nsh->hasErrCtl = sh->hasErrCtl; nsh->errCheck = estrdup(sh->errCheck); nsh->ignErr = estrdup(sh->ignErr); nsh->echo = estrdup(sh->echo); nsh->exit = estrdup(sh->exit); return (nsh); } /*- *----------------------------------------------------------------------- * Job_ParseShell -- * Parse a shell specification and set up commandShell, shellPath * and shellName appropriately. * * Results: * FAILURE if the specification was incorrect. * * Side Effects: * commandShell points to a Shell structure (either predefined or * created from the shell spec), shellPath is the full path of the * shell described by commandShell, while shellName is just the * final component of shellPath. * * Notes: * A shell specification consists of a .SHELL target, with dependency * operator, followed by a series of blank-separated words. Double * quotes can be used to use blanks in words. A backslash escapes * anything (most notably a double-quote and a space) and * provides the functionality it does in C. Each word consists of * keyword and value separated by an equal sign. There should be no * unnecessary spaces in the word. The keywords are as follows: * name Name of shell. * path Location of shell. Overrides "name" if given * quiet Command to turn off echoing. * echo Command to turn echoing on * filter Result of turning off echoing that shouldn't be * printed. * echoFlag Flag to turn echoing on at the start * errFlag Flag to turn error checking on at the start * hasErrCtl True if shell has error checking control * check Command to turn on error checking if hasErrCtl * is TRUE or template of command to echo a command * for which error checking is off if hasErrCtl is * FALSE. * ignore Command to turn off error checking if hasErrCtl * is TRUE or template of command to execute a * command so as to ignore any errors it returns if * hasErrCtl is FALSE. * *----------------------------------------------------------------------- */ ReturnStatus Job_ParseShell(char *line) { char **words; int wordCount; char **argv; int argc; char *path; Shell newShell; Shell *sh; Boolean fullSpec = FALSE; while (isspace((unsigned char)*line)) { line++; } words = brk_string(line, &wordCount, TRUE); memset(&newShell, 0, sizeof(newShell)); /* * Parse the specification by keyword */ for (path = NULL, argc = wordCount - 1, argv = words + 1; argc != 0; argc--, argv++) { if (strncmp(*argv, "path=", 5) == 0) { path = &argv[0][5]; } else if (strncmp(*argv, "name=", 5) == 0) { newShell.name = &argv[0][5]; } else { if (strncmp(*argv, "quiet=", 6) == 0) { newShell.echoOff = &argv[0][6]; } else if (strncmp(*argv, "echo=", 5) == 0) { newShell.echoOn = &argv[0][5]; } else if (strncmp(*argv, "filter=", 7) == 0) { newShell.noPrint = &argv[0][7]; newShell.noPLen = strlen(newShell.noPrint); } else if (strncmp(*argv, "echoFlag=", 9) == 0) { newShell.echo = &argv[0][9]; } else if (strncmp(*argv, "errFlag=", 8) == 0) { newShell.exit = &argv[0][8]; } else if (strncmp(*argv, "hasErrCtl=", 10) == 0) { char c = argv[0][10]; newShell.hasErrCtl = !((c != 'Y') && (c != 'y') && (c != 'T') && (c != 't')); } else if (strncmp(*argv, "check=", 6) == 0) { newShell.errCheck = &argv[0][6]; } else if (strncmp(*argv, "ignore=", 7) == 0) { newShell.ignErr = &argv[0][7]; } else { Parse_Error(PARSE_FATAL, "Unknown keyword \"%s\"", *argv); return (FAILURE); } fullSpec = TRUE; } } /* * Some checks (could be more) */ if (fullSpec) { if ((newShell.echoOn != NULL) ^ (newShell.echoOff != NULL)) Parse_Error(PARSE_FATAL, "Shell must have either both echoOff and " "echoOn or none of them"); if (newShell.echoOn != NULL && newShell.echoOff) newShell.hasEchoCtl = TRUE; } if (path == NULL) { /* * If no path was given, the user wants one of the pre-defined shells, * yes? So we find the one s/he wants with the help of JobMatchShell * and set things up the right way. shellPath will be set up by * Job_Init. */ if (newShell.name == NULL) { Parse_Error(PARSE_FATAL, "Neither path nor name specified"); return (FAILURE); } if ((sh = JobMatchShell(newShell.name)) == NULL) { Parse_Error(PARSE_FATAL, "%s: no matching shell", newShell.name); return (FAILURE); } } else { /* * The user provided a path. If s/he gave nothing else (fullSpec is * FALSE), try and find a matching shell in the ones we know of. * Else we just take the specification at its word and copy it * to a new location. In either case, we need to record the * path the user gave for the shell. */ free(shellPath); shellPath = estrdup(path); if (newShell.name == NULL) { /* get the base name as the name */ path = strrchr(path, '/'); if (path == NULL) { path = shellPath; } else { path += 1; } newShell.name = path; } if (!fullSpec) { if ((sh = JobMatchShell(newShell.name)) == NULL) { Parse_Error(PARSE_FATAL, "%s: no matching shell", newShell.name); return (FAILURE); } } else { sh = JobCopyShell(&newShell); } } /* set the new shell */ JobFreeShell(commandShell); commandShell = sh; shellName = commandShell->name; return (SUCCESS); } /*- *----------------------------------------------------------------------- * JobInterrupt -- * Handle the receipt of an interrupt. * * Results: * None * * Side Effects: * All children are killed. Another job will be started if the * .INTERRUPT target was given. *----------------------------------------------------------------------- */ static void JobInterrupt(int runINTERRUPT, int signo) { LstNode *ln; /* element in job table */ Job *job; /* job descriptor in that element */ GNode *interrupt; /* the node describing the .INTERRUPT target */ aborting = ABORT_INTERRUPT; for (ln = Lst_First(&jobs); ln != NULL; ln = Lst_Succ(ln)) { job = Lst_Datum(ln); if (!Targ_Precious(job->node)) { char *file = (job->node->path == NULL ? job->node->name : job->node->path); if (!noExecute && eunlink(file) != -1) { Error("*** %s removed", file); } } if (job->pid) { DEBUGF(JOB, ("JobInterrupt passing signal to child %d.\n", job->pid)); KILL(job->pid, signo); } } if (runINTERRUPT && !touchFlag) { /* clear the interrupted flag because we would get an * infinite loop otherwise */ interrupted = 0; interrupt = Targ_FindNode(".INTERRUPT", TARG_NOCREATE); if (interrupt != NULL) { ignoreErrors = FALSE; JobStart(interrupt, JOB_IGNDOTS, (Job *)NULL); while (nJobs) { Job_CatchOutput(0); Job_CatchChildren(!usePipes); } } } } /* *----------------------------------------------------------------------- * 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 (postCommands != NULL && !Lst_IsEmpty(&postCommands->commands)) { if (errors) { Error("Errors reported so .END ignored"); } else { JobStart(postCommands, JOB_SPECIAL | JOB_IGNDOTS, NULL); while (nJobs) { Job_CatchOutput(0); Job_CatchChildren(!usePipes); } } } if (fifoFd >= 0) { close(fifoFd); fifoFd = -1; if (fifoMaster) unlink(fifoName); } return (errors); } /*- *----------------------------------------------------------------------- * Job_Wait -- * Waits for all running jobs to finish and returns. Sets 'aborting' * to ABORT_WAIT to prevent other jobs from starting. * * Results: * None. * * Side Effects: * Currently running jobs finish. * *----------------------------------------------------------------------- */ void Job_Wait(void) { aborting = ABORT_WAIT; while (nJobs != 0) { Job_CatchOutput(0); Job_CatchChildren(!usePipes); } 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. * * Results: * None * * 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_Succ(ln)) { 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((pid_t)-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! * * Results: * None. * * Side Effects: * Resumes(and possibly migrates) jobs. * *----------------------------------------------------------------------- */ static void JobRestartJobs(void) { while (!jobFull && !Lst_IsEmpty(&stoppedJobs)) { DEBUGF(JOB, ("Job queue is not full. Restarting a stopped job.\n")); JobRestart(Lst_DeQueue(&stoppedJobs)); } }