File: [cvs.NetBSD.org] / src / usr.bin / make / job.c (download)
Revision 1.352, Thu Dec 10 20:10:03 2020 UTC (3 years, 4 months ago) by rillig
Branch: MAIN
Changes since 1.351: +3 -3
lines
make(1): fix theoretical type mismatch for Job_Touch
|
/* $NetBSD: job.c,v 1.352 2020/12/10 20:10:03 rillig Exp $ */
/*
* Copyright (c) 1988, 1989, 1990 The Regents of the University of California.
* 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.
*/
/*
* 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 --
* handle the creation etc. of our child processes.
*
* Interface:
* Job_Init Called to initialize this module. In addition,
* any commands attached to the .BEGIN target
* are executed before this function returns.
* Hence, the makefiles must have been parsed
* before this function is called.
*
* Job_End Clean up any memory used.
*
* 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_ParseShell Given the line following a .SHELL target, parse
* the line as a shell specification. Returns
* FALSE 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.
*
* 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 <sys/types.h>
#include <sys/stat.h>
#include <sys/file.h>
#include <sys/time.h>
#include <sys/wait.h>
#include <errno.h>
#ifndef USE_SELECT
#include <poll.h>
#endif
#include <signal.h>
#include <utime.h>
#include "make.h"
#include "dir.h"
#include "job.h"
#include "pathnames.h"
#include "trace.h"
/* "@(#)job.c 8.2 (Berkeley) 3/19/94" */
MAKE_RCSID("$NetBSD: job.c,v 1.352 2020/12/10 20:10:03 rillig Exp $");
/*
* A shell defines how the commands are run. All commands for a target are
* written into a single file, which is then given to the shell to execute
* the commands from it. The commands are written to the file using a few
* templates for echo control and error control.
*
* The name of the shell is the basename for the predefined shells, such as
* "sh", "csh", "bash". For custom shells, it is the full pathname, and its
* basename is used to select the type of shell; the longest match wins.
* So /usr/pkg/bin/bash has type sh, /usr/local/bin/tcsh has type csh.
*
* The echoing of command lines is controlled using hasEchoCtl, echoOff,
* echoOn, noPrint and noPrintLen. When echoOff is executed by the shell, it
* still outputs something, but this something is not interesting, therefore
* it is filtered out using noPrint and noPrintLen.
*
* The error checking for individual commands is controlled using hasErrCtl,
* errOnOrEcho, errOffOrExecIgnore and errExit.
*
* If a shell doesn't have error control, errOnOrEcho becomes a printf template
* for echoing the command, should echoing be on; errOffOrExecIgnore becomes
* another printf template for executing the command while ignoring the return
* status. Finally errExit is a printf template for running the command and
* causing the shell to exit on error. If any of these strings are empty when
* hasErrCtl is FALSE, the command will be executed anyway as is, and if it
* causes an error, so be it. Any templates set up to echo the command will
* escape any '$ ` \ "' characters in the command string to avoid common
* problems with echo "%s\n" as a template.
*
* The command-line flags "echo" and "exit" also control the behavior. The
* "echo" flag causes the shell to start echoing commands right away. The
* "exit" flag causes the shell to exit when an error is detected in one of
* the commands.
*/
typedef struct Shell {
/*
* The name of the shell. For Bourne and C shells, this is used only
* to find the shell description when used as the single source of a
* .SHELL target. For user-defined shells, this is the full path of
* the shell.
*/
const char *name;
Boolean hasEchoCtl; /* True if both echoOff and echoOn defined */
const char *echoOff; /* command to turn off echo */
const char *echoOn; /* command to turn it back on again */
const char *noPrint; /* text to skip when printing output from
* shell. This is usually the same as echoOff */
size_t noPrintLen; /* length of noPrint command */
Boolean hasErrCtl; /* set if can control error checking for
* individual commands */
/* XXX: split into errOn and echoCmd */
const char *errOnOrEcho; /* template to turn on error checking */
/*
* template to turn off error checking
* XXX: split into errOff and execIgnore
*/
const char *errOffOrExecIgnore;
const char *errExit; /* template to use for testing exit code */
/* string literal that results in a newline character when it appears
* outside of any 'quote' or "quote" characters */
const char *newline;
char commentChar; /* character used by shell for comment lines */
/*
* command-line flags
*/
const char *echo; /* echo commands */
const char *exit; /* exit on error */
} Shell;
typedef struct RunFlags {
/* Whether to echo the command before running it. */
Boolean echo;
Boolean always;
/*
* true if we turned error checking off before printing the command
* and need to turn it back on
*/
Boolean ignerr;
} RunFlags;
/*
* error handling variables
*/
static int job_errors = 0; /* number of errors reported */
typedef enum AbortReason { /* why is the make aborting? */
ABORT_NONE,
ABORT_ERROR, /* Because of an error */
ABORT_INTERRUPT, /* Because it was interrupted */
ABORT_WAIT /* Waiting for jobs to finish */
} AbortReason;
static AbortReason aborting = ABORT_NONE;
#define JOB_TOKENS "+EI+" /* Token to requeue for each abort state */
/*
* this tracks the number of tokens currently "out" to build jobs.
*/
int jobTokensRunning = 0;
/* The number of commands actually printed to the shell commands file for
* the current job. Should this number be 0, no shell will be executed. */
static int numCommands;
typedef enum JobStartResult {
JOB_RUNNING, /* Job is running */
JOB_ERROR, /* Error in starting the job */
JOB_FINISHED /* The job is already finished */
} JobStartResult;
/*
* Descriptions for various shells.
*
* The build environment may set DEFSHELL_INDEX to one of
* DEFSHELL_INDEX_SH, DEFSHELL_INDEX_KSH, or DEFSHELL_INDEX_CSH, to
* select one of the predefined shells as the default shell.
*
* Alternatively, the build environment may set DEFSHELL_CUSTOM to the
* name or the full path of a sh-compatible shell, which will be used as
* the default shell.
*
* ".SHELL" lines in Makefiles can choose the default shell from the
* set defined here, or add additional shells.
*/
#ifdef DEFSHELL_CUSTOM
#define DEFSHELL_INDEX_CUSTOM 0
#define DEFSHELL_INDEX_SH 1
#define DEFSHELL_INDEX_KSH 2
#define DEFSHELL_INDEX_CSH 3
#else /* !DEFSHELL_CUSTOM */
#define DEFSHELL_INDEX_SH 0
#define DEFSHELL_INDEX_KSH 1
#define DEFSHELL_INDEX_CSH 2
#endif /* !DEFSHELL_CUSTOM */
#ifndef DEFSHELL_INDEX
#define DEFSHELL_INDEX 0 /* DEFSHELL_INDEX_CUSTOM or DEFSHELL_INDEX_SH */
#endif /* !DEFSHELL_INDEX */
static Shell shells[] = {
#ifdef DEFSHELL_CUSTOM
/*
* An sh-compatible shell with a non-standard name.
*
* Keep this in sync with the "sh" description below, but avoid
* non-portable features that might not be supplied by all
* sh-compatible shells.
*/
{
DEFSHELL_CUSTOM, /* .name */
FALSE, /* .hasEchoCtl */
"", /* .echoOff */
"", /* .echoOn */
"", /* .noPrint */
0, /* .noPrintLen */
FALSE, /* .hasErrCtl */
"echo \"%s\"\n", /* .errOnOrEcho */
"%s\n", /* .errOffOrExecIgnore */
"{ %s \n} || exit $?\n", /* .errExit */
"'\n'", /* .newline */
'#', /* .commentChar */
"", /* .echo */
"", /* .exit */
},
#endif /* DEFSHELL_CUSTOM */
/*
* SH description. Echo control is also possible and, under
* sun UNIX anyway, one can even control error checking.
*/
{
"sh", /* .name */
FALSE, /* .hasEchoCtl */
"", /* .echoOff */
"", /* .echoOn */
"", /* .noPrint */
0, /* .noPrintLen */
FALSE, /* .hasErrCtl */
"echo \"%s\"\n", /* .errOnOrEcho */
"%s\n", /* .errOffOrExecIgnore */
"{ %s \n} || exit $?\n", /* .errExit */
"'\n'", /* .newline */
'#', /* .commentChar*/
#if defined(MAKE_NATIVE) && defined(__NetBSD__)
"q", /* .echo */
#else
"", /* .echo */
#endif
"", /* .exit */
},
/*
* KSH description.
*/
{
"ksh", /* .name */
TRUE, /* .hasEchoCtl */
"set +v", /* .echoOff */
"set -v", /* .echoOn */
"set +v", /* .noPrint */
6, /* .noPrintLen */
FALSE, /* .hasErrCtl */
"echo \"%s\"\n", /* .errOnOrEcho */
"%s\n", /* .errOffOrExecIgnore */
"{ %s \n} || exit $?\n", /* .errExit */
"'\n'", /* .newline */
'#', /* .commentChar */
"v", /* .echo */
"", /* .exit */
},
/*
* 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", /* .name */
TRUE, /* .hasEchoCtl */
"unset verbose", /* .echoOff */
"set verbose", /* .echoOn */
"unset verbose", /* .noPrint */
13, /* .noPrintLen */
FALSE, /* .hasErrCtl */
"echo \"%s\"\n", /* .errOnOrEcho */
/* XXX: Mismatch between errOn and execIgnore */
"csh -c \"%s || exit 0\"\n", /* .errOffOrExecIgnore */
"", /* .errExit */
"'\\\n'", /* .newline */
'#', /* .commentChar */
"v", /* .echo */
"e", /* .exit */
}
};
/* This is the shell to which we pass all commands in the Makefile.
* It is set by the Job_ParseShell function. */
static Shell *commandShell = &shells[DEFSHELL_INDEX];
const char *shellPath = NULL; /* full pathname of executable image */
const char *shellName = NULL; /* last component of shellPath */
char *shellErrFlag = NULL;
static char *shellArgv = NULL; /* Custom shell args */
static Job *job_table; /* The structures that describe them */
static Job *job_table_end; /* job_table + maxJobs */
static unsigned int wantToken; /* we want a token */
static Boolean lurking_children = FALSE;
static Boolean make_suspended = FALSE; /* Whether we've seen a SIGTSTP (etc) */
/*
* Set of descriptors of pipes connected to
* the output channels of children
*/
static struct pollfd *fds = NULL;
static Job **allJobs = NULL;
static nfds_t nJobs = 0;
static void watchfd(Job *);
static void clearfd(Job *);
static int readyfd(Job *);
static char *targPrefix = NULL; /* To identify a job change in the output. */
static Job tokenWaitJob; /* token wait pseudo-job */
static Job childExitJob; /* child exit pseudo-job */
#define CHILD_EXIT "."
#define DO_JOB_RESUME "R"
enum {
npseudojobs = 2 /* number of pseudo-jobs */
};
static sigset_t caught_signals; /* Set of signals we handle */
static void JobDoOutput(Job *, Boolean);
static void JobInterrupt(int, int) MAKE_ATTR_DEAD;
static void JobRestartJobs(void);
static void JobSigReset(void);
static void
SwitchOutputTo(GNode *gn)
{
/* The node for which output was most recently produced. */
static GNode *lastNode = NULL;
if (gn == lastNode)
return;
lastNode = gn;
if (opts.maxJobs != 1 && targPrefix != NULL && targPrefix[0] != '\0')
(void)fprintf(stdout, "%s %s ---\n", targPrefix, gn->name);
}
static unsigned
nfds_per_job(void)
{
#if defined(USE_FILEMON) && !defined(USE_FILEMON_DEV)
if (useMeta)
return 2;
#endif
return 1;
}
static void
job_table_dump(const char *where)
{
Job *job;
debug_printf("job table @ %s\n", where);
for (job = job_table; job < job_table_end; job++) {
debug_printf("job %d, status %d, flags %d, pid %d\n",
(int)(job - job_table), job->status, job->flags, job->pid);
}
}
/*
* Delete the target of a failed, interrupted, or otherwise
* unsuccessful job unless inhibited by .PRECIOUS.
*/
static void
JobDeleteTarget(GNode *gn)
{
const char *file;
if (gn->type & OP_JOIN)
return;
if (gn->type & OP_PHONY)
return;
if (Targ_Precious(gn))
return;
if (opts.noExecute)
return;
file = GNode_Path(gn);
if (eunlink(file) != -1)
Error("*** %s removed", file);
}
/*
* JobSigLock/JobSigUnlock
*
* Signal lock routines to get exclusive access. Currently used to
* protect `jobs' and `stoppedJobs' list manipulations.
*/
static void JobSigLock(sigset_t *omaskp)
{
if (sigprocmask(SIG_BLOCK, &caught_signals, omaskp) != 0) {
Punt("JobSigLock: sigprocmask: %s", strerror(errno));
sigemptyset(omaskp);
}
}
static void JobSigUnlock(sigset_t *omaskp)
{
(void)sigprocmask(SIG_SETMASK, omaskp, NULL);
}
static void
JobCreatePipe(Job *job, int minfd)
{
int i, fd, flags;
int pipe_fds[2];
if (pipe(pipe_fds) == -1)
Punt("Cannot create pipe: %s", strerror(errno));
for (i = 0; i < 2; i++) {
/* Avoid using low numbered fds */
fd = fcntl(pipe_fds[i], F_DUPFD, minfd);
if (fd != -1) {
close(pipe_fds[i]);
pipe_fds[i] = fd;
}
}
job->inPipe = pipe_fds[0];
job->outPipe = pipe_fds[1];
/* Set close-on-exec flag for both */
if (fcntl(job->inPipe, F_SETFD, FD_CLOEXEC) == -1)
Punt("Cannot set close-on-exec: %s", strerror(errno));
if (fcntl(job->outPipe, F_SETFD, FD_CLOEXEC) == -1)
Punt("Cannot set close-on-exec: %s", strerror(errno));
/*
* We mark the input side of the pipe non-blocking; we poll(2) the
* pipe when we're waiting for a job token, but we might lose the
* race for the token when a new one becomes available, so the read
* from the pipe should not block.
*/
flags = fcntl(job->inPipe, F_GETFL, 0);
if (flags == -1)
Punt("Cannot get flags: %s", strerror(errno));
flags |= O_NONBLOCK;
if (fcntl(job->inPipe, F_SETFL, flags) == -1)
Punt("Cannot set flags: %s", strerror(errno));
}
/* Pass the signal to each running job. */
static void
JobCondPassSig(int signo)
{
Job *job;
DEBUG1(JOB, "JobCondPassSig(%d) called.\n", signo);
for (job = job_table; job < job_table_end; job++) {
if (job->status != JOB_ST_RUNNING)
continue;
DEBUG2(JOB, "JobCondPassSig passing signal %d to child %d.\n",
signo, job->pid);
KILLPG(job->pid, signo);
}
}
/*
* SIGCHLD handler.
*
* Sends a token on the child exit pipe to wake us up from select()/poll().
*/
static void
JobChildSig(int signo MAKE_ATTR_UNUSED)
{
while (write(childExitJob.outPipe, CHILD_EXIT, 1) == -1 &&
errno == EAGAIN)
continue;
}
/* Resume all stopped jobs. */
static void
JobContinueSig(int signo MAKE_ATTR_UNUSED)
{
/*
* Defer sending SIGCONT to our stopped children until we return
* from the signal handler.
*/
while (write(childExitJob.outPipe, DO_JOB_RESUME, 1) == -1 &&
errno == EAGAIN)
continue;
}
/*
* Pass a signal on to all jobs, then resend to ourselves.
* We die by the same signal.
*/
MAKE_ATTR_DEAD static void
JobPassSig_int(int signo)
{
/* Run .INTERRUPT target then exit */
JobInterrupt(TRUE, signo);
}
/*
* Pass a signal on to all jobs, then resend to ourselves.
* We die by the same signal.
*/
MAKE_ATTR_DEAD static void
JobPassSig_term(int signo)
{
/* Dont run .INTERRUPT target then exit */
JobInterrupt(FALSE, signo);
}
static void
JobPassSig_suspend(int signo)
{
sigset_t nmask, omask;
struct sigaction act;
/* Suppress job started/continued messages */
make_suspended = TRUE;
/* Pass the signal onto every job */
JobCondPassSig(signo);
/*
* 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.
*/
sigfillset(&nmask);
sigdelset(&nmask, signo);
(void)sigprocmask(SIG_SETMASK, &nmask, &omask);
act.sa_handler = SIG_DFL;
sigemptyset(&act.sa_mask);
act.sa_flags = 0;
(void)sigaction(signo, &act, NULL);
DEBUG1(JOB, "JobPassSig passing signal %d to self.\n", signo);
(void)kill(getpid(), signo);
/*
* We've been continued.
*
* A whole host of signals continue to happen!
* SIGCHLD for any processes that actually suspended themselves.
* SIGCHLD for any processes that exited while we were alseep.
* The SIGCONT that actually caused us to wakeup.
*
* Since we defer passing the SIGCONT on to our children until
* the main processing loop, we can be sure that all the SIGCHLD
* events will have happened by then - and that the waitpid() will
* collect the child 'suspended' events.
* For correct sequencing we just need to ensure we process the
* waitpid() before passing on the SIGCONT.
*
* In any case nothing else is needed here.
*/
/* Restore handler and signal mask */
act.sa_handler = JobPassSig_suspend;
(void)sigaction(signo, &act, NULL);
(void)sigprocmask(SIG_SETMASK, &omask, NULL);
}
static Job *
JobFindPid(int pid, JobStatus status, Boolean isJobs)
{
Job *job;
for (job = job_table; job < job_table_end; job++) {
if (job->status == status && job->pid == pid)
return job;
}
if (DEBUG(JOB) && isJobs)
job_table_dump("no pid");
return NULL;
}
/* Parse leading '@', '-' and '+', which control the exact execution mode. */
static void
ParseRunOptions(char **pp, RunFlags *out_runFlags)
{
char *p = *pp;
out_runFlags->echo = TRUE;
out_runFlags->ignerr = FALSE;
out_runFlags->always = FALSE;
for (;;) {
if (*p == '@')
out_runFlags->echo = DEBUG(LOUD);
else if (*p == '-')
out_runFlags->ignerr = TRUE;
else if (*p == '+')
out_runFlags->always = TRUE;
else
break;
p++;
}
pp_skip_whitespace(&p);
*pp = p;
}
/* Escape a string for a double-quoted string literal in sh, csh and ksh. */
static char *
EscapeShellDblQuot(const char *cmd)
{
size_t i, j;
/* Worst that could happen is every char needs escaping. */
char *esc = bmake_malloc(strlen(cmd) * 2 + 1);
for (i = 0, j = 0; cmd[i] != '\0'; i++, j++) {
if (cmd[i] == '$' || cmd[i] == '`' || cmd[i] == '\\' ||
cmd[i] == '"')
esc[j++] = '\\';
esc[j] = cmd[i];
}
esc[j] = '\0';
return esc;
}
static void
JobPrintf(Job *job, const char *fmt, const char *arg)
{
DEBUG1(JOB, fmt, arg);
(void)fprintf(job->cmdFILE, fmt, arg);
(void)fflush(job->cmdFILE);
}
static void
JobPrintln(Job *job, const char *line)
{
JobPrintf(job, "%s\n", line);
}
/*
* 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?
*/
static void
JobPrintSpecialsErrCtl(Job *job, Boolean echo)
{
if (!(job->flags & JOB_SILENT) && echo && commandShell->hasEchoCtl) {
JobPrintln(job, commandShell->echoOff);
JobPrintln(job, commandShell->errOffOrExecIgnore);
JobPrintln(job, commandShell->echoOn);
} else {
JobPrintln(job, commandShell->errOffOrExecIgnore);
}
}
/*
* 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 errOnOrEcho 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.
*/
static void
JobPrintSpecialsEchoCtl(Job *job, RunFlags *inout_runFlags, const char *escCmd,
const char **inout_cmdTemplate)
{
job->flags |= JOB_IGNERR;
if (!(job->flags & JOB_SILENT) && inout_runFlags->echo) {
if (commandShell->hasEchoCtl)
JobPrintln(job, commandShell->echoOff);
JobPrintf(job, commandShell->errOnOrEcho, escCmd);
inout_runFlags->echo = FALSE;
} else {
if (inout_runFlags->echo)
JobPrintf(job, commandShell->errOnOrEcho, escCmd);
}
*inout_cmdTemplate = commandShell->errOffOrExecIgnore;
/*
* The error ignoration (hee hee) is already taken care of by the
* errOffOrExecIgnore template, so pretend error checking is still on.
*/
inout_runFlags->ignerr = FALSE;
}
static void
JobPrintSpecials(Job *const job, const char *const escCmd,
Boolean const run, RunFlags *const inout_runFlags,
const char **const inout_cmdTemplate)
{
if (!run)
inout_runFlags->ignerr = FALSE;
else if (commandShell->hasErrCtl)
JobPrintSpecialsErrCtl(job, inout_runFlags->echo);
else if (commandShell->errOffOrExecIgnore != NULL &&
commandShell->errOffOrExecIgnore[0] != '\0') {
JobPrintSpecialsEchoCtl(job, inout_runFlags, escCmd,
inout_cmdTemplate);
} else
inout_runFlags->ignerr = FALSE;
}
/*
* 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 and executed by Job_End when all things
* are done.
*
* 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.
* numCommands is incremented if the command is actually printed.
*/
static void
JobPrintCommand(Job *job, char *cmd)
{
const char *const cmdp = cmd;
Boolean run;
RunFlags runFlags;
/* Template to use when printing the command */
const char *cmdTemplate;
char *cmdStart; /* Start of expanded command */
char *escCmd = NULL; /* Command with quotes/backticks escaped */
run = GNode_ShouldExecute(job->node);
numCommands++;
Var_Subst(cmd, job->node, VARE_WANTRES, &cmd);
/* TODO: handle errors */
cmdStart = cmd;
cmdTemplate = "%s\n";
ParseRunOptions(&cmd, &runFlags);
/* The '+' command flag overrides the -n or -N options. */
if (runFlags.always && !run) {
/*
* We're not actually executing anything...
* but this one needs to be - use compat mode just for it.
*/
Compat_RunCommand(cmdp, job->node);
free(cmdStart);
return;
}
/*
* If the shell doesn't have error control the alternate echo'ing will
* be done (to avoid showing additional error checking code)
* and this will need the characters '$ ` \ "' escaped
*/
if (!commandShell->hasErrCtl)
escCmd = EscapeShellDblQuot(cmd);
if (!runFlags.echo) {
if (!(job->flags & JOB_SILENT) && run &&
commandShell->hasEchoCtl) {
JobPrintln(job, commandShell->echoOff);
} else {
if (commandShell->hasErrCtl)
runFlags.echo = TRUE;
}
}
if (runFlags.ignerr) {
JobPrintSpecials(job, escCmd, run, &runFlags, &cmdTemplate);
} else {
/*
* If errors are being checked and the shell doesn't have
* error control but does supply an errExit template, then
* set up commands to run through it.
*/
if (!commandShell->hasErrCtl && commandShell->errExit &&
commandShell->errExit[0] != '\0') {
if (!(job->flags & JOB_SILENT) && runFlags.echo) {
if (commandShell->hasEchoCtl)
JobPrintln(job, commandShell->echoOff);
JobPrintf(job, commandShell->errOnOrEcho,
escCmd);
runFlags.echo = FALSE;
}
/*
* If it's a comment line or blank, treat as an
* ignored error.
*/
if (escCmd[0] == commandShell->commentChar ||
(escCmd[0] == '\0'))
cmdTemplate = commandShell->errOffOrExecIgnore;
else
cmdTemplate = commandShell->errExit;
runFlags.ignerr = FALSE;
}
}
if (DEBUG(SHELL) && strcmp(shellName, "sh") == 0 &&
!(job->flags & JOB_TRACED)) {
JobPrintln(job, "set -x");
job->flags |= JOB_TRACED;
}
JobPrintf(job, cmdTemplate, cmd);
free(cmdStart);
free(escCmd);
if (runFlags.ignerr) {
/*
* 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 (runFlags.echo && !(job->flags & JOB_SILENT) &&
commandShell->hasEchoCtl) {
JobPrintln(job, commandShell->echoOff);
runFlags.echo = FALSE;
}
JobPrintln(job, commandShell->errOnOrEcho);
}
if (!runFlags.echo && commandShell->hasEchoCtl)
JobPrintln(job, commandShell->echoOn);
}
/*
* Print all commands to the shell file that is later executed.
*
* The special command "..." stops printing and saves the remaining commands
* to be executed later.
*/
static void
JobPrintCommands(Job *job)
{
StringListNode *ln;
for (ln = job->node->commands.first; ln != NULL; ln = ln->next) {
const char *cmd = ln->datum;
if (strcmp(cmd, "...") == 0) {
job->node->type |= OP_SAVE_CMDS;
job->tailCmds = ln->next;
break;
}
JobPrintCommand(job, ln->datum);
}
}
/* Save the delayed commands, to be executed when everything else is done. */
static void
JobSaveCommands(Job *job)
{
StringListNode *ln;
for (ln = job->tailCmds; ln != NULL; ln = ln->next) {
const char *cmd = ln->datum;
char *expanded_cmd;
/* XXX: This Var_Subst is only intended to expand the dynamic
* variables such as .TARGET, .IMPSRC. It is not intended to
* expand the other variables as well; see deptgt-end.mk. */
(void)Var_Subst(cmd, job->node, VARE_WANTRES, &expanded_cmd);
/* TODO: handle errors */
Lst_Append(&Targ_GetEndNode()->commands, expanded_cmd);
}
}
/* Called to close both input and output pipes when a job is finished. */
static void
JobClosePipes(Job *job)
{
clearfd(job);
(void)close(job->outPipe);
job->outPipe = -1;
JobDoOutput(job, TRUE);
(void)close(job->inPipe);
job->inPipe = -1;
}
/*
* Do final processing for the given job including updating parent nodes and
* starting new jobs as available/necessary.
*
* Deferred commands for the job are placed on the .END node.
*
* If there was a serious error (job_errors != 0; not an ignored one), no more
* jobs will be started.
*
* Input:
* job job to finish
* status sub-why job went away
*/
static void
JobFinish(Job *job, int status)
{
Boolean done, return_job_token;
DEBUG3(JOB, "JobFinish: %d [%s], status %d\n",
job->pid, job->node->name, status);
if ((WIFEXITED(status) &&
((WEXITSTATUS(status) != 0 && !(job->flags & JOB_IGNERR)))) ||
WIFSIGNALED(status)) {
/*
* 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...
*/
JobClosePipes(job);
if (job->cmdFILE != NULL && job->cmdFILE != stdout) {
(void)fclose(job->cmdFILE);
job->cmdFILE = NULL;
}
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 to run
* the next command.
*/
done = WEXITSTATUS(status) != 0;
JobClosePipes(job);
} else {
/*
* No need to close things down or anything.
*/
done = FALSE;
}
if (done) {
if (WIFEXITED(status)) {
DEBUG2(JOB, "Process %d [%s] exited.\n",
job->pid, job->node->name);
if (WEXITSTATUS(status) != 0) {
SwitchOutputTo(job->node);
#ifdef USE_META
if (useMeta) {
meta_job_error(job, job->node,
job->flags, WEXITSTATUS(status));
}
#endif
if (!shouldDieQuietly(job->node, -1))
(void)printf(
"*** [%s] Error code %d%s\n",
job->node->name,
WEXITSTATUS(status),
(job->flags & JOB_IGNERR)
? " (ignored)" : "");
if (job->flags & JOB_IGNERR) {
status = 0;
} else {
if (deleteOnError) {
JobDeleteTarget(job->node);
}
PrintOnError(job->node, NULL);
}
} else if (DEBUG(JOB)) {
SwitchOutputTo(job->node);
(void)printf(
"*** [%s] Completed successfully\n",
job->node->name);
}
} else {
SwitchOutputTo(job->node);
(void)printf("*** [%s] Signal %d\n",
job->node->name, WTERMSIG(status));
if (deleteOnError) {
JobDeleteTarget(job->node);
}
}
(void)fflush(stdout);
}
#ifdef USE_META
if (useMeta) {
int meta_status = meta_job_finish(job);
if (meta_status != 0 && status == 0)
status = meta_status;
}
#endif
return_job_token = FALSE;
Trace_Log(JOBEND, job);
if (!(job->flags & JOB_SPECIAL)) {
if (status != 0 ||
(aborting == ABORT_ERROR) || aborting == ABORT_INTERRUPT)
return_job_token = TRUE;
}
if (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.
*/
JobSaveCommands(job);
job->node->made = MADE;
if (!(job->flags & JOB_SPECIAL))
return_job_token = TRUE;
Make_Update(job->node);
job->status = JOB_ST_FREE;
} else if (status != 0) {
job_errors++;
job->status = JOB_ST_FREE;
}
if (job_errors > 0 && !opts.keepgoing && aborting != ABORT_INTERRUPT) {
/* Prevent more jobs from getting started. */
aborting = ABORT_ERROR;
}
if (return_job_token)
Job_TokenReturn();
if (aborting == ABORT_ERROR && jobTokensRunning == 0)
Finish(job_errors);
}
static void
TouchRegular(GNode *gn)
{
const char *file = GNode_Path(gn);
struct utimbuf times = { now, now };
int fd;
char c;
if (utime(file, ×) >= 0)
return;
fd = open(file, O_RDWR | O_CREAT, 0666);
if (fd < 0) {
(void)fprintf(stderr, "*** couldn't touch %s: %s\n",
file, strerror(errno));
(void)fflush(stderr);
return; /* XXX: What about propagating the error? */
}
/* Last resort: update the file's time stamps in the traditional way.
* XXX: This doesn't work for empty files, which are sometimes used
* as marker files. */
if (read(fd, &c, 1) == 1) {
(void)lseek(fd, 0, SEEK_SET);
while (write(fd, &c, 1) == -1 && errno == EAGAIN)
continue;
}
(void)close(fd); /* XXX: What about propagating the error? */
}
/* Touch the given target. Called by JobStart when the -t flag was given.
*
* The modification date of the file is changed.
* If the file did not exist, it is created. */
void
Job_Touch(GNode *gn, Boolean silent)
{
if (gn->type &
(OP_JOIN | OP_USE | OP_USEBEFORE | OP_EXEC | OP_OPTIONAL |
OP_SPECIAL | OP_PHONY)) {
/*
* These are "virtual" targets and should not really be
* created.
*/
return;
}
if (!silent || !GNode_ShouldExecute(gn)) {
(void)fprintf(stdout, "touch %s\n", gn->name);
(void)fflush(stdout);
}
if (!GNode_ShouldExecute(gn))
return;
if (gn->type & OP_ARCHV) {
Arch_Touch(gn);
return;
}
if (gn->type & OP_LIB) {
Arch_TouchLib(gn);
return;
}
TouchRegular(gn);
}
/* Make sure the given node has all the commands it needs.
*
* The node will have commands from the .DEFAULT rule added to it if it
* needs them.
*
* Input:
* gn The target whose commands need verifying
* abortProc Function to abort with message
*
* Results:
* TRUE if the commands list is/was ok.
*/
Boolean
Job_CheckCommands(GNode *gn, void (*abortProc)(const char *, ...))
{
if (GNode_IsTarget(gn))
return TRUE;
if (!Lst_IsEmpty(&gn->commands))
return TRUE;
if ((gn->type & OP_LIB) && !Lst_IsEmpty(&gn->children))
return TRUE;
/*
* No commands. Look for .DEFAULT rule from which we might infer
* commands.
*/
if (defaultNode != NULL && !Lst_IsEmpty(&defaultNode->commands) &&
!(gn->type & OP_SPECIAL)) {
/*
* The traditional Make only looks for a .DEFAULT if the node
* was never the target of an operator, so that's what we do
* too.
*
* The .DEFAULT node acts like a transformation rule, in that
* gn also inherits any attributes or sources attached to
* .DEFAULT itself.
*/
Make_HandleUse(defaultNode, gn);
Var_Set(IMPSRC, GNode_VarTarget(gn), gn);
return TRUE;
}
Dir_UpdateMTime(gn, FALSE);
if (gn->mtime != 0 || (gn->type & OP_SPECIAL))
return TRUE;
/*
* 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.
*/
if (gn->flags & FROM_DEPEND) {
if (!Job_RunTarget(".STALE", gn->fname))
fprintf(stdout,
"%s: %s, %d: ignoring stale %s for %s\n",
progname, gn->fname, gn->lineno, makeDependfile,
gn->name);
return TRUE;
}
if (gn->type & OP_OPTIONAL) {
(void)fprintf(stdout, "%s: don't know how to make %s (%s)\n",
progname, gn->name, "ignored");
(void)fflush(stdout);
return TRUE;
}
if (opts.keepgoing) {
(void)fprintf(stdout, "%s: don't know how to make %s (%s)\n",
progname, gn->name, "continuing");
(void)fflush(stdout);
return FALSE;
}
abortProc("%s: don't know how to make %s. Stop", progname, gn->name);
return FALSE;
}
/* Execute the shell for the given job.
*
* See Job_CatchOutput for handling the output of the shell. */
static void
JobExec(Job *job, char **argv)
{
int cpid; /* ID of new child */
sigset_t mask;
job->flags &= ~JOB_TRACED;
if (DEBUG(JOB)) {
int i;
debug_printf("Running %s\n", job->node->name);
debug_printf("\tCommand: ");
for (i = 0; argv[i] != NULL; i++) {
debug_printf("%s ", argv[i]);
}
debug_printf("\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 (!(job->flags & JOB_SILENT))
SwitchOutputTo(job->node);
/* No interruptions until this job is on the `jobs' list */
JobSigLock(&mask);
/* Pre-emptively mark job running, pid still zero though */
job->status = JOB_ST_RUNNING;
cpid = vFork();
if (cpid == -1)
Punt("Cannot vfork: %s", strerror(errno));
if (cpid == 0) {
/* Child */
sigset_t tmask;
#ifdef USE_META
if (useMeta) {
meta_job_child(job);
}
#endif
/*
* Reset all signal handlers; this is necessary because we
* also need to unblock signals before we exec(2).
*/
JobSigReset();
/* Now unblock signals */
sigemptyset(&tmask);
JobSigUnlock(&tmask);
/*
* 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)
execDie("dup2", "job->cmdFILE");
if (fcntl(0, F_SETFD, 0) == -1)
execDie("fcntl clear close-on-exec", "stdin");
if (lseek(0, 0, SEEK_SET) == -1)
execDie("lseek to 0", "stdin");
if (job->node->type & (OP_MAKE | OP_SUBMAKE)) {
/*
* Pass job token pipe to submakes.
*/
if (fcntl(tokenWaitJob.inPipe, F_SETFD, 0) == -1)
execDie("clear close-on-exec",
"tokenWaitJob.inPipe");
if (fcntl(tokenWaitJob.outPipe, F_SETFD, 0) == -1)
execDie("clear close-on-exec",
"tokenWaitJob.outPipe");
}
/*
* Set up the child's output to be routed through the pipe
* we've created for it.
*/
if (dup2(job->outPipe, 1) == -1)
execDie("dup2", "job->outPipe");
/*
* 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.
*/
if (fcntl(1, F_SETFD, 0) == -1)
execDie("clear close-on-exec", "stdout");
if (dup2(1, 2) == -1)
execDie("dup2", "1, 2");
/*
* 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(MAKE_NATIVE) || defined(HAVE_SETPGID)
# if defined(SYSV)
/* XXX: dsl - I'm sure this should be setpgrp()... */
(void)setsid();
# else
(void)setpgid(0, getpid());
# endif
#endif
Var_ExportVars();
(void)execv(shellPath, argv);
execDie("exec", shellPath);
}
/* Parent, continuing after the child exec */
job->pid = cpid;
Trace_Log(JOBSTART, job);
#ifdef USE_META
if (useMeta) {
meta_job_parent(job, cpid);
}
#endif
/*
* Set the current position in the buffer to the beginning
* and mark another stream to watch in the outputs mask
*/
job->curPos = 0;
watchfd(job);
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.
*/
if (DEBUG(JOB)) {
debug_printf("JobExec(%s): pid %d added to jobs table\n",
job->node->name, job->pid);
job_table_dump("job started");
}
JobSigUnlock(&mask);
}
/* 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] = UNCONST(shellName);
argc = 1;
if ((commandShell->exit && commandShell->exit[0] != '-') ||
(commandShell->echo && commandShell->echo[0] != '-')) {
/*
* 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.
*
* TODO: Research until when the above comments were
* practically relevant.
*/
(void)snprintf(args, sizeof 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] = UNCONST(commandShell->exit);
argc++;
}
if (!(job->flags & JOB_SILENT) && commandShell->echo) {
argv[argc] = UNCONST(commandShell->echo);
argc++;
}
}
argv[argc] = NULL;
}
/*
* Start a target-creation process going for the target described by the
* graph node gn.
*
* Input:
* gn target to create
* flags flags for the job to override normal ones.
* previous The previous Job structure for this node, if any.
*
* 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.
*
* NB: The return value is ignored by everyone.
*/
static JobStartResult
JobStart(GNode *gn, JobFlags flags)
{
Job *job; /* new job descriptor */
char *argv[10]; /* 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 to the temp file */
for (job = job_table; job < job_table_end; job++) {
if (job->status == JOB_ST_FREE)
break;
}
if (job >= job_table_end)
Punt("JobStart no job slots vacant");
memset(job, 0, sizeof *job);
job->node = gn;
job->tailCmds = NULL;
job->status = JOB_ST_SET_UP;
if (gn->type & OP_SPECIAL)
flags |= JOB_SPECIAL;
if (Targ_Ignore(gn))
flags |= JOB_IGNERR;
if (Targ_Silent(gn))
flags |= JOB_SILENT;
job->flags = flags;
/*
* Check the commands now so any attributes from .DEFAULT have a
* chance to migrate to the node.
*/
cmdsOK = Job_CheckCommands(gn, Error);
job->inPollfd = NULL;
/*
* 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) && !opts.noRecursiveExecute) ||
(!opts.noExecute && !opts.touchFlag)) {
/*
* tfile is the name of a file into which all shell commands
* are put. It is removed before the child shell is executed,
* unless DEBUG(SCRIPT) is set.
*/
char *tfile;
sigset_t mask;
/*
* We're serious here, but if the commands were bogus, we're
* also dead...
*/
if (!cmdsOK) {
PrintOnError(gn, NULL); /* provide some clue */
DieHorribly();
}
JobSigLock(&mask);
tfd = mkTempFile(TMPPAT, &tfile);
if (!DEBUG(SCRIPT))
(void)eunlink(tfile);
JobSigUnlock(&mask);
job->cmdFILE = fdopen(tfd, "w+");
if (job->cmdFILE == NULL)
Punt("Could not fdopen %s", tfile);
(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;
#ifdef USE_META
if (useMeta) {
meta_job_start(job, gn);
if (Targ_Silent(gn)) /* might have changed */
job->flags |= JOB_SILENT;
}
#endif
/* We can do all the commands at once. hooray for sanity */
numCommands = 0;
JobPrintCommands(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;
}
free(tfile);
} else if (!GNode_ShouldExecute(gn)) {
/*
* Not executing anything -- just print all the commands to
* stdout in one fell swoop. This will still set up
* job->tailCmds correctly.
*/
SwitchOutputTo(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)
JobPrintCommands(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) != 0);
noExec = TRUE;
}
/* Just in case it isn't already... */
(void)fflush(job->cmdFILE);
/* If we're not supposed to execute a shell, don't. */
if (noExec) {
if (!(job->flags & JOB_SPECIAL))
Job_TokenReturn();
/* Unlink and close the command file if we opened one */
if (job->cmdFILE != NULL && job->cmdFILE != stdout) {
(void)fclose(job->cmdFILE);
job->cmdFILE = NULL;
}
/*
* 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 && aborting == ABORT_NONE) {
JobSaveCommands(job);
job->node->made = MADE;
Make_Update(job->node);
}
job->status = JOB_ST_FREE;
return cmdsOK ? JOB_FINISHED : JOB_ERROR;
}
/*
* 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. */
JobCreatePipe(job, 3);
JobExec(job, argv);
return JOB_RUNNING;
}
/*
* Print the output of the shell command, skipping the noPrint command of
* the shell, if any.
*/
static char *
JobOutput(char *cp, char *endp)
{
char *ecp;
if (commandShell->noPrint == NULL || commandShell->noPrint[0] == '\0')
return cp;
while ((ecp = strstr(cp, commandShell->noPrint)) != NULL) {
if (ecp != cp) {
*ecp = '\0';
/*
* 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 + commandShell->noPrintLen;
if (cp != endp) {
/*
* Still more to print, look again after skipping
* the whitespace following the non-printable
* command.
*/
cp++;
pp_skip_whitespace(&cp);
} else {
return cp;
}
}
return cp;
}
/*
* This function 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.
*
* In the output of the shell, the 'noPrint' lines are removed. If the
* command is not alone on the line (the character after it is not \0 or
* \n), we do print whatever follows it.
*
* Input:
* job the job whose output needs printing
* finish TRUE if this is the last time we'll be called
* for this job
*/
static void
JobDoOutput(Job *job, Boolean finish)
{
Boolean gotNL; /* true if got a newline */
Boolean fbuf; /* true if our buffer filled up */
size_t nr; /* number of bytes read */
size_t i; /* auxiliary index into outBuf */
size_t max; /* limit for i (end of current data) */
ssize_t nRead; /* (Temporary) number of bytes read */
/* Read as many bytes as will fit in the buffer. */
again:
gotNL = FALSE;
fbuf = FALSE;
nRead = read(job->inPipe, &job->outBuf[job->curPos],
JOB_BUFSIZE - job->curPos);
if (nRead < 0) {
if (errno == EAGAIN)
return;
if (DEBUG(JOB)) {
perror("JobDoOutput(piperead)");
}
nr = 0;
} else {
nr = (size_t)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 != (size_t)-1; 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->outBuf, &job->outBuf[i]);
/*
* 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 (!opts.beSilent)
SwitchOutputTo(job->node);
#ifdef USE_META
if (useMeta) {
meta_job_output(job, cp,
gotNL ? "\n" : "");
}
#endif
(void)fprintf(stdout, "%s%s", cp,
gotNL ? "\n" : "");
(void)fflush(stdout);
}
}
/*
* max is the last offset still in the buffer. Move any
* remaining characters to the start of the buffer and
* update the end marker curPos.
*/
if (i < max) {
(void)memmove(job->outBuf, &job->outBuf[i + 1],
max - (i + 1));
job->curPos = max - (i + 1);
} else {
assert(i == max);
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 again;
}
}
static void
JobRun(GNode *targ)
{
#if 0
/*
* Unfortunately it is too complicated to run .BEGIN, .END, and
* .INTERRUPT job in the parallel job module. As of 2020-09-25,
* unit-tests/deptgt-end-jobs.mk hangs in an endless loop.
*
* Running these jobs in compat mode also guarantees that these
* jobs do not overlap with other unrelated jobs.
*/
List *lst = Lst_New();
Lst_Append(lst, targ);
(void)Make_Run(lst);
Lst_Destroy(lst, NULL);
JobStart(targ, JOB_SPECIAL);
while (jobTokensRunning != 0) {
Job_CatchOutput();
}
#else
Compat_Make(targ, targ);
/* XXX: Replace with GNode_IsError(gn) */
if (targ->made == ERROR) {
PrintOnError(targ, "\n\nStop.");
exit(1);
}
#endif
}
/* Handle the exit of a child. Called from Make_Make.
*
* 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.
*/
void
Job_CatchChildren(void)
{
int pid; /* pid of dead child */
int status; /* Exit/termination status */
/* Don't even bother if we know there's no one around. */
if (jobTokensRunning == 0)
return;
while ((pid = waitpid((pid_t)-1, &status, WNOHANG | WUNTRACED)) > 0) {
DEBUG2(JOB, "Process %d exited/stopped status %x.\n",
pid, status);
JobReapChild(pid, status, TRUE);
}
}
/*
* It is possible that wait[pid]() was called from elsewhere,
* this lets us reap jobs regardless.
*/
void
JobReapChild(pid_t pid, int status, Boolean isJobs)
{
Job *job; /* job descriptor for dead child */
/* Don't even bother if we know there's no one around. */
if (jobTokensRunning == 0)
return;
job = JobFindPid(pid, JOB_ST_RUNNING, isJobs);
if (job == NULL) {
if (isJobs) {
if (!lurking_children)
Error("Child (%d) status %x not in table?",
pid, status);
}
return; /* not ours */
}
if (WIFSTOPPED(status)) {
DEBUG2(JOB, "Process %d (%s) stopped.\n",
job->pid, job->node->name);
if (!make_suspended) {
switch (WSTOPSIG(status)) {
case SIGTSTP:
(void)printf("*** [%s] Suspended\n",
job->node->name);
break;
case SIGSTOP:
(void)printf("*** [%s] Stopped\n",
job->node->name);
break;
default:
(void)printf("*** [%s] Stopped -- signal %d\n",
job->node->name, WSTOPSIG(status));
}
job->suspended = TRUE;
}
(void)fflush(stdout);
return;
}
job->status = JOB_ST_FINISHED;
job->exit_status = status;
JobFinish(job, status);
}
/* 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. */
void
Job_CatchOutput(void)
{
int nready;
Job *job;
unsigned int i;
(void)fflush(stdout);
/* The first fd in the list is the job token pipe */
do {
nready = poll(fds + 1 - wantToken, nJobs - 1 + wantToken,
POLL_MSEC);
} while (nready < 0 && errno == EINTR);
if (nready < 0)
Punt("poll: %s", strerror(errno));
if (nready > 0 && readyfd(&childExitJob)) {
char token = 0;
ssize_t count;
count = read(childExitJob.inPipe, &token, 1);
switch (count) {
case 0:
Punt("unexpected eof on token pipe");
case -1:
Punt("token pipe read: %s", strerror(errno));
case 1:
if (token == DO_JOB_RESUME[0])
/*
* Complete relay requested from our SIGCONT
* handler
*/
JobRestartJobs();
break;
default:
abort();
}
nready--;
}
Job_CatchChildren();
if (nready == 0)
return;
for (i = npseudojobs * nfds_per_job(); i < nJobs; i++) {
if (!fds[i].revents)
continue;
job = allJobs[i];
if (job->status == JOB_ST_RUNNING)
JobDoOutput(job, FALSE);
#if defined(USE_FILEMON) && !defined(USE_FILEMON_DEV)
/*
* With meta mode, we may have activity on the job's filemon
* descriptor too, which at the moment is any pollfd other
* than job->inPollfd.
*/
if (useMeta && job->inPollfd != &fds[i]) {
if (meta_job_event(job) <= 0) {
fds[i].events = 0; /* never mind */
}
}
#endif
if (--nready == 0)
return;
}
}
/* Start the creation of a target. Basically a front-end for JobStart used by
* the Make module. */
void
Job_Make(GNode *gn)
{
(void)JobStart(gn, JOB_NONE);
}
static void
InitShellNameAndPath(void)
{
shellName = commandShell->name;
#ifdef DEFSHELL_CUSTOM
if (shellName[0] == '/') {
shellPath = shellName;
shellName = strrchr(shellPath, '/') + 1;
return;
}
#endif
shellPath = str_concat3(_PATH_DEFSHELLDIR, "/", shellName);
}
void
Shell_Init(void)
{
if (shellPath == NULL)
InitShellNameAndPath();
Var_SetWithFlags(".SHELL", shellPath, VAR_CMDLINE, VAR_SET_READONLY);
if (commandShell->exit == NULL) {
commandShell->exit = "";
}
if (commandShell->echo == NULL) {
commandShell->echo = "";
}
if (commandShell->hasErrCtl && commandShell->exit[0] != '\0') {
if (shellErrFlag &&
strcmp(commandShell->exit, &shellErrFlag[1]) != 0) {
free(shellErrFlag);
shellErrFlag = NULL;
}
if (shellErrFlag == NULL) {
size_t n = strlen(commandShell->exit) + 2;
shellErrFlag = bmake_malloc(n);
if (shellErrFlag != NULL) {
snprintf(shellErrFlag, n, "-%s",
commandShell->exit);
}
}
} else if (shellErrFlag != NULL) {
free(shellErrFlag);
shellErrFlag = NULL;
}
}
/*
* Return the string literal that is used in the current command shell
* to produce a newline character.
*/
const char *
Shell_GetNewline(void)
{
return commandShell->newline;
}
void
Job_SetPrefix(void)
{
if (targPrefix != NULL) {
free(targPrefix);
} else if (!Var_Exists(MAKE_JOB_PREFIX, VAR_GLOBAL)) {
Var_Set(MAKE_JOB_PREFIX, "---", VAR_GLOBAL);
}
(void)Var_Subst("${" MAKE_JOB_PREFIX "}",
VAR_GLOBAL, VARE_WANTRES, &targPrefix);
/* TODO: handle errors */
}
static void
AddSig(int sig, SignalProc handler)
{
if (bmake_signal(sig, SIG_IGN) != SIG_IGN) {
sigaddset(&caught_signals, sig);
(void)bmake_signal(sig, handler);
}
}
/* Initialize the process module. */
void
Job_Init(void)
{
Job_SetPrefix();
/* Allocate space for all the job info */
job_table = bmake_malloc((size_t)opts.maxJobs * sizeof *job_table);
memset(job_table, 0, (size_t)opts.maxJobs * sizeof *job_table);
job_table_end = job_table + opts.maxJobs;
wantToken = 0;
aborting = ABORT_NONE;
job_errors = 0;
/*
* There is a non-zero chance that we already have children.
* eg after 'make -f- <<EOF'
* Since their termination causes a 'Child (pid) not in table'
* message, Collect the status of any that are already dead, and
* suppress the error message if there are any undead ones.
*/
for (;;) {
int rval, status;
rval = waitpid((pid_t)-1, &status, WNOHANG);
if (rval > 0)
continue;
if (rval == 0)
lurking_children = TRUE;
break;
}
Shell_Init();
JobCreatePipe(&childExitJob, 3);
/* Preallocate enough for the maximum number of jobs. */
fds = bmake_malloc(sizeof *fds *
(npseudojobs + (size_t)opts.maxJobs) *
nfds_per_job());
allJobs = bmake_malloc(sizeof *allJobs *
(npseudojobs + (size_t)opts.maxJobs) *
nfds_per_job());
/* These are permanent entries and take slots 0 and 1 */
watchfd(&tokenWaitJob);
watchfd(&childExitJob);
sigemptyset(&caught_signals);
/*
* Install a SIGCHLD handler.
*/
(void)bmake_signal(SIGCHLD, JobChildSig);
sigaddset(&caught_signals, SIGCHLD);
/*
* Catch the four signals that POSIX specifies if they aren't ignored.
* JobPassSig will take care of calling JobInterrupt if appropriate.
*/
AddSig(SIGINT, JobPassSig_int);
AddSig(SIGHUP, JobPassSig_term);
AddSig(SIGTERM, JobPassSig_term);
AddSig(SIGQUIT, JobPassSig_term);
/*
* 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)
*/
AddSig(SIGTSTP, JobPassSig_suspend);
AddSig(SIGTTOU, JobPassSig_suspend);
AddSig(SIGTTIN, JobPassSig_suspend);
AddSig(SIGWINCH, JobCondPassSig);
AddSig(SIGCONT, JobContinueSig);
(void)Job_RunTarget(".BEGIN", NULL);
/* Create the .END node now, even though no code in the unit tests
* depends on it. See also Targ_GetEndNode in Compat_Run. */
(void)Targ_GetEndNode();
}
static void
DelSig(int sig)
{
if (sigismember(&caught_signals, sig))
(void)bmake_signal(sig, SIG_DFL);
}
static void JobSigReset(void)
{
DelSig(SIGINT);
DelSig(SIGHUP);
DelSig(SIGQUIT);
DelSig(SIGTERM);
DelSig(SIGTSTP);
DelSig(SIGTTOU);
DelSig(SIGTTIN);
DelSig(SIGWINCH);
DelSig(SIGCONT);
(void)bmake_signal(SIGCHLD, SIG_DFL);
}
/* Find a shell in 'shells' given its name, or return NULL. */
static Shell *
FindShellByName(const char *name)
{
Shell *sh = shells;
const Shell *shellsEnd = sh + sizeof shells / sizeof shells[0];
for (sh = shells; sh < shellsEnd; sh++) {
if (strcmp(name, sh->name) == 0)
return sh;
}
return NULL;
}
/*
* Parse a shell specification and set up commandShell, shellPath and
* shellName appropriately.
*
* Input:
* line The shell spec
*
* Results:
* FALSE 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.
* 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
* newline String literal to represent a newline char
* 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.
*/
Boolean
Job_ParseShell(char *line)
{
Words wordsList;
char **words;
char **argv;
size_t argc;
char *path;
Shell newShell;
Boolean fullSpec = FALSE;
Shell *sh;
pp_skip_whitespace(&line);
free(shellArgv);
memset(&newShell, 0, sizeof newShell);
/*
* Parse the specification by keyword
*/
wordsList = Str_Words(line, TRUE);
words = wordsList.words;
argc = wordsList.len;
path = wordsList.freeIt;
if (words == NULL) {
Error("Unterminated quoted string [%s]", line);
return FALSE;
}
shellArgv = path;
for (path = NULL, argv = words; argc != 0; argc--, argv++) {
char *arg = *argv;
if (strncmp(arg, "path=", 5) == 0) {
path = arg + 5;
} else if (strncmp(arg, "name=", 5) == 0) {
newShell.name = arg + 5;
} else {
if (strncmp(arg, "quiet=", 6) == 0) {
newShell.echoOff = arg + 6;
} else if (strncmp(arg, "echo=", 5) == 0) {
newShell.echoOn = arg + 5;
} else if (strncmp(arg, "filter=", 7) == 0) {
newShell.noPrint = arg + 7;
newShell.noPrintLen = strlen(newShell.noPrint);
} else if (strncmp(arg, "echoFlag=", 9) == 0) {
newShell.echo = arg + 9;
} else if (strncmp(arg, "errFlag=", 8) == 0) {
newShell.exit = arg + 8;
} else if (strncmp(arg, "hasErrCtl=", 10) == 0) {
char c = arg[10];
newShell.hasErrCtl = c == 'Y' || c == 'y' ||
c == 'T' || c == 't';
} else if (strncmp(arg, "newline=", 8) == 0) {
newShell.newline = arg + 8;
} else if (strncmp(arg, "check=", 6) == 0) {
newShell.errOnOrEcho = arg + 6;
} else if (strncmp(arg, "ignore=", 7) == 0) {
newShell.errOffOrExecIgnore = arg + 7;
} else if (strncmp(arg, "errout=", 7) == 0) {
newShell.errExit = arg + 7;
} else if (strncmp(arg, "comment=", 8) == 0) {
newShell.commentChar = arg[8];
} else {
Parse_Error(PARSE_FATAL,
"Unknown keyword \"%s\"", arg);
free(words);
return FALSE;
}
fullSpec = 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 FindShellByName and set things up the
* right way. shellPath will be set up by Shell_Init.
*/
if (newShell.name == NULL) {
Parse_Error(PARSE_FATAL,
"Neither path nor name specified");
free(words);
return FALSE;
} else {
if ((sh = FindShellByName(newShell.name)) == NULL) {
Parse_Error(PARSE_WARNING,
"%s: No matching shell", newShell.name);
free(words);
return FALSE;
}
commandShell = sh;
shellName = newShell.name;
if (shellPath != NULL) {
/*
* Shell_Init has already been called!
* Do it again.
*/
free(UNCONST(shellPath));
shellPath = NULL;
Shell_Init();
}
}
} 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.
*/
shellPath = path;
path = strrchr(path, '/');
if (path == NULL) {
path = UNCONST(shellPath);
} else {
path++;
}
if (newShell.name != NULL) {
shellName = newShell.name;
} else {
shellName = path;
}
if (!fullSpec) {
if ((sh = FindShellByName(shellName)) == NULL) {
Parse_Error(PARSE_WARNING,
"%s: No matching shell", shellName);
free(words);
return FALSE;
}
commandShell = sh;
} else {
commandShell = bmake_malloc(sizeof *commandShell);
*commandShell = newShell;
}
/* this will take care of shellErrFlag */
Shell_Init();
}
if (commandShell->echoOn && commandShell->echoOff) {
commandShell->hasEchoCtl = TRUE;
}
if (!commandShell->hasErrCtl) {
if (commandShell->errOnOrEcho == NULL) {
commandShell->errOnOrEcho = "";
}
if (commandShell->errOffOrExecIgnore == NULL) {
commandShell->errOffOrExecIgnore = "%s\n";
}
}
/*
* Do not free up the words themselves, since they might be in use
* by the shell specification.
*/
free(words);
return TRUE;
}
/*
* Handle the receipt of an interrupt.
*
* All children are killed. Another job will be started if the .INTERRUPT
* target is defined.
*
* Input:
* runINTERRUPT Non-zero if commands for the .INTERRUPT target
* should be executed
* signo signal received
*/
static void
JobInterrupt(int runINTERRUPT, int signo)
{
Job *job; /* job descriptor in that element */
GNode *interrupt; /* the node describing the .INTERRUPT target */
sigset_t mask;
GNode *gn;
aborting = ABORT_INTERRUPT;
JobSigLock(&mask);
for (job = job_table; job < job_table_end; job++) {
if (job->status != JOB_ST_RUNNING)
continue;
gn = job->node;
JobDeleteTarget(gn);
if (job->pid) {
DEBUG2(JOB,
"JobInterrupt passing signal %d to child %d.\n",
signo, job->pid);
KILLPG(job->pid, signo);
}
}
JobSigUnlock(&mask);
if (runINTERRUPT && !opts.touchFlag) {
interrupt = Targ_FindNode(".INTERRUPT");
if (interrupt != NULL) {
opts.ignoreErrors = FALSE;
JobRun(interrupt);
}
}
Trace_Log(MAKEINTR, NULL);
exit(signo);
}
/*
* Do the final processing, i.e. run the commands attached to the .END target.
*
* Return the number of errors reported.
*/
int
Job_Finish(void)
{
GNode *endNode = Targ_GetEndNode();
if (!Lst_IsEmpty(&endNode->commands) ||
!Lst_IsEmpty(&endNode->children)) {
if (job_errors != 0) {
Error("Errors reported so .END ignored");
} else {
JobRun(endNode);
}
}
return job_errors;
}
/* Clean up any memory used by the jobs module. */
void
Job_End(void)
{
#ifdef CLEANUP
free(shellArgv);
#endif
}
/*
* Waits for all running jobs to finish and returns.
* Sets 'aborting' to ABORT_WAIT to prevent other jobs from starting.
*/
void
Job_Wait(void)
{
aborting = ABORT_WAIT;
while (jobTokensRunning != 0) {
Job_CatchOutput();
}
aborting = ABORT_NONE;
}
/*
* 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.
*
* All children are killed, not just the firstborn.
*/
void
Job_AbortAll(void)
{
Job *job; /* the job descriptor in that element */
int foo;
aborting = ABORT_ERROR;
if (jobTokensRunning != 0) {
for (job = job_table; job < job_table_end; job++) {
if (job->status != JOB_ST_RUNNING)
continue;
/*
* kill the child process with increasingly drastic
* signals to make darn sure it's dead.
*/
KILLPG(job->pid, SIGINT);
KILLPG(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;
}
/*
* Tries to restart stopped jobs if there are slots available.
* Called in process context in response to a SIGCONT.
*/
static void
JobRestartJobs(void)
{
Job *job;
for (job = job_table; job < job_table_end; job++) {
if (job->status == JOB_ST_RUNNING &&
(make_suspended || job->suspended)) {
DEBUG1(JOB, "Restarting stopped job pid %d.\n",
job->pid);
if (job->suspended) {
(void)printf("*** [%s] Continued\n",
job->node->name);
(void)fflush(stdout);
}
job->suspended = FALSE;
if (KILLPG(job->pid, SIGCONT) != 0 && DEBUG(JOB)) {
debug_printf("Failed to send SIGCONT to %d\n",
job->pid);
}
}
if (job->status == JOB_ST_FINISHED) {
/*
* Job exit deferred after calling waitpid() in a
* signal handler
*/
JobFinish(job, job->exit_status);
}
}
make_suspended = FALSE;
}
static void
watchfd(Job *job)
{
if (job->inPollfd != NULL)
Punt("Watching watched job");
fds[nJobs].fd = job->inPipe;
fds[nJobs].events = POLLIN;
allJobs[nJobs] = job;
job->inPollfd = &fds[nJobs];
nJobs++;
#if defined(USE_FILEMON) && !defined(USE_FILEMON_DEV)
if (useMeta) {
fds[nJobs].fd = meta_job_fd(job);
fds[nJobs].events = fds[nJobs].fd == -1 ? 0 : POLLIN;
allJobs[nJobs] = job;
nJobs++;
}
#endif
}
static void
clearfd(Job *job)
{
size_t i;
if (job->inPollfd == NULL)
Punt("Unwatching unwatched job");
i = (size_t)(job->inPollfd - fds);
nJobs--;
#if defined(USE_FILEMON) && !defined(USE_FILEMON_DEV)
if (useMeta) {
/*
* Sanity check: there should be two fds per job, so the job's
* pollfd number should be even.
*/
assert(nfds_per_job() == 2);
if (i % 2)
Punt("odd-numbered fd with meta");
nJobs--;
}
#endif
/*
* Move last job in table into hole made by dead job.
*/
if (nJobs != i) {
fds[i] = fds[nJobs];
allJobs[i] = allJobs[nJobs];
allJobs[i]->inPollfd = &fds[i];
#if defined(USE_FILEMON) && !defined(USE_FILEMON_DEV)
if (useMeta) {
fds[i + 1] = fds[nJobs + 1];
allJobs[i + 1] = allJobs[nJobs + 1];
}
#endif
}
job->inPollfd = NULL;
}
static int
readyfd(Job *job)
{
if (job->inPollfd == NULL)
Punt("Polling unwatched job");
return (job->inPollfd->revents & POLLIN) != 0;
}
/* Put a token (back) into the job pipe.
* This allows a make process to start a build job. */
static void
JobTokenAdd(void)
{
char tok = JOB_TOKENS[aborting], tok1;
/* If we are depositing an error token flush everything else */
while (tok != '+' && read(tokenWaitJob.inPipe, &tok1, 1) == 1)
continue;
DEBUG3(JOB, "(%d) aborting %d, deposit token %c\n",
getpid(), aborting, JOB_TOKENS[aborting]);
while (write(tokenWaitJob.outPipe, &tok, 1) == -1 && errno == EAGAIN)
continue;
}
/* Prep the job token pipe in the root make process. */
void
Job_ServerStart(int max_tokens, int jp_0, int jp_1)
{
int i;
char jobarg[64];
if (jp_0 >= 0 && jp_1 >= 0) {
/* Pipe passed in from parent */
tokenWaitJob.inPipe = jp_0;
tokenWaitJob.outPipe = jp_1;
(void)fcntl(jp_0, F_SETFD, FD_CLOEXEC);
(void)fcntl(jp_1, F_SETFD, FD_CLOEXEC);
return;
}
JobCreatePipe(&tokenWaitJob, 15);
snprintf(jobarg, sizeof jobarg, "%d,%d",
tokenWaitJob.inPipe, tokenWaitJob.outPipe);
Var_Append(MAKEFLAGS, "-J", VAR_GLOBAL);
Var_Append(MAKEFLAGS, jobarg, VAR_GLOBAL);
/*
* Preload the job pipe with one token per job, save the one
* "extra" token for the primary job.
*
* XXX should clip maxJobs against PIPE_BUF -- if max_tokens is
* larger than the write buffer size of the pipe, we will
* deadlock here.
*/
for (i = 1; i < max_tokens; i++)
JobTokenAdd();
}
/* Return a withdrawn token to the pool. */
void
Job_TokenReturn(void)
{
jobTokensRunning--;
if (jobTokensRunning < 0)
Punt("token botch");
if (jobTokensRunning || JOB_TOKENS[aborting] != '+')
JobTokenAdd();
}
/*
* Attempt to withdraw a token from the pool.
*
* If pool is empty, set wantToken so that we wake up when a token is
* released.
*
* Returns TRUE if a token was withdrawn, and FALSE if the pool is currently
* empty.
*/
Boolean
Job_TokenWithdraw(void)
{
char tok, tok1;
ssize_t count;
wantToken = 0;
DEBUG3(JOB, "Job_TokenWithdraw(%d): aborting %d, running %d\n",
getpid(), aborting, jobTokensRunning);
if (aborting != ABORT_NONE || (jobTokensRunning >= opts.maxJobs))
return FALSE;
count = read(tokenWaitJob.inPipe, &tok, 1);
if (count == 0)
Fatal("eof on job pipe!");
if (count < 0 && jobTokensRunning != 0) {
if (errno != EAGAIN) {
Fatal("job pipe read: %s", strerror(errno));
}
DEBUG1(JOB, "(%d) blocked for token\n", getpid());
return FALSE;
}
if (count == 1 && tok != '+') {
/* make being aborted - remove any other job tokens */
DEBUG2(JOB, "(%d) aborted by token %c\n", getpid(), tok);
while (read(tokenWaitJob.inPipe, &tok1, 1) == 1)
continue;
/* And put the stopper back */
while (write(tokenWaitJob.outPipe, &tok, 1) == -1 &&
errno == EAGAIN)
continue;
if (shouldDieQuietly(NULL, 1))
exit(2);
Fatal("A failure has been detected "
"in another branch of the parallel make");
}
if (count == 1 && jobTokensRunning == 0)
/* We didn't want the token really */
while (write(tokenWaitJob.outPipe, &tok, 1) == -1 &&
errno == EAGAIN)
continue;
jobTokensRunning++;
DEBUG1(JOB, "(%d) withdrew token\n", getpid());
return TRUE;
}
/*
* Run the named target if found. If a filename is specified, then set that
* to the sources.
*
* Exits if the target fails.
*/
Boolean
Job_RunTarget(const char *target, const char *fname)
{
GNode *gn = Targ_FindNode(target);
if (gn == NULL)
return FALSE;
if (fname != NULL)
Var_Set(ALLSRC, fname, gn);
JobRun(gn);
/* XXX: Replace with GNode_IsError(gn) */
if (gn->made == ERROR) {
PrintOnError(gn, "\n\nStop.");
exit(1);
}
return TRUE;
}
#ifdef USE_SELECT
int
emul_poll(struct pollfd *fd, int nfd, int timeout)
{
fd_set rfds, wfds;
int i, maxfd, nselect, npoll;
struct timeval tv, *tvp;
long usecs;
FD_ZERO(&rfds);
FD_ZERO(&wfds);
maxfd = -1;
for (i = 0; i < nfd; i++) {
fd[i].revents = 0;
if (fd[i].events & POLLIN)
FD_SET(fd[i].fd, &rfds);
if (fd[i].events & POLLOUT)
FD_SET(fd[i].fd, &wfds);
if (fd[i].fd > maxfd)
maxfd = fd[i].fd;
}
if (maxfd >= FD_SETSIZE) {
Punt("Ran out of fd_set slots; "
"recompile with a larger FD_SETSIZE.");
}
if (timeout < 0) {
tvp = NULL;
} else {
usecs = timeout * 1000;
tv.tv_sec = usecs / 1000000;
tv.tv_usec = usecs % 1000000;
tvp = &tv;
}
nselect = select(maxfd + 1, &rfds, &wfds, NULL, tvp);
if (nselect <= 0)
return nselect;
npoll = 0;
for (i = 0; i < nfd; i++) {
if (FD_ISSET(fd[i].fd, &rfds))
fd[i].revents |= POLLIN;
if (FD_ISSET(fd[i].fd, &wfds))
fd[i].revents |= POLLOUT;
if (fd[i].revents)
npoll++;
}
return npoll;
}
#endif /* USE_SELECT */
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