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freebsd-nq/usr.bin/make/job.c
Rodney W. Grimes 7799f52a32 Remove trailing whitespace.
1995-05-30 06:41:30 +00:00

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/*
* Copyright (c) 1988, 1989, 1990 The Regents of the University of California.
* Copyright (c) 1988, 1989 by Adam de Boor
* Copyright (c) 1989 by Berkeley Softworks
* All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Adam de Boor.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. 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.
*/
#ifndef lint
static char sccsid[] = "@(#)job.c 8.2 (Berkeley) 3/19/94";
#endif /* not lint */
/*-
* 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_End 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 <sys/types.h>
#include <sys/signal.h>
#include <sys/stat.h>
#include <sys/file.h>
#include <sys/time.h>
#include <sys/wait.h>
#include <fcntl.h>
#include <errno.h>
#include <stdio.h>
#include <string.h>
#include <signal.h>
#include "make.h"
#include "hash.h"
#include "dir.h"
#include "job.h"
#include "pathnames.h"
extern int errno;
/*
* 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 */
/*
* 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 the name of a file into which all shell commands are put. It is
* used over by removing it before the child shell is executed. The XXXXX in
* the string are replaced by the pid of the make process in a 5-character
* field with leading zeroes.
*/
static char tfile[] = TMPPAT;
/*
* Descriptions for various shells.
*/
static Shell 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", 10,
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,
FALSE, "echo \"%s\"\n", "sh -c '%s || exit 0'\n",
"v", "e",
},
/*
* UNKNOWN.
*/
{
(char *)0,
FALSE, (char *)0, (char *)0, (char *)0, 0,
FALSE, (char *)0, (char *)0,
(char *)0, (char *)0,
}
};
static Shell *commandShell = &shells[DEFSHELL];/* this is the shell to
* which we pass all
* commands in the Makefile.
* It is set by the
* Job_ParseShell function */
static char *shellPath = (char *) NULL, /* full pathname of
* executable image */
*shellName; /* last component of shell */
static int maxJobs; /* The most children we can run at once */
static int maxLocal; /* The most local ones we can have */
int nJobs; /* The number of children currently running */
int nLocal; /* The number of local children */
Lst jobs; /* The structures that describe them */
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 or
* (2) a job can only be run locally, but
* nLocal equals maxLocal */
#ifndef RMT_WILL_WATCH
static fd_set outputs; /* Set of descriptors of pipes connected to
* the output channels of children */
#endif
GNode *lastNode; /* The node for which output was most recently
* produced. */
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 */
/*
* When JobStart attempts to run a job remotely but can't, and isn't allowed
* to run the job locally, or when Job_CatchChildren detects a job that has
* been migrated home, the job is placed on the stoppedJobs queue to be run
* when the next job finishes.
*/
Lst stoppedJobs; /* Lst of Job structures describing
* jobs that were stopped due to concurrency
* limits or migration home */
#if defined(USE_PGRP) && defined(SYSV)
#define KILL(pid,sig) killpg (-(pid),(sig))
#else
# if defined(USE_PGRP)
#define KILL(pid,sig) killpg ((pid),(sig))
# else
#define KILL(pid,sig) kill ((pid),(sig))
# endif
#endif
static int JobCondPassSig __P((ClientData, ClientData));
static void JobPassSig __P((int));
static int JobCmpPid __P((ClientData, ClientData));
static int JobPrintCommand __P((ClientData, ClientData));
static int JobSaveCommand __P((ClientData, ClientData));
static void JobFinish __P((Job *, union wait));
static void JobExec __P((Job *, char **));
static void JobMakeArgv __P((Job *, char **));
static void JobRestart __P((Job *));
static int JobStart __P((GNode *, int, Job *));
static void JobDoOutput __P((Job *, Boolean));
static Shell *JobMatchShell __P((char *));
static void JobInterrupt __P((int));
/*-
*-----------------------------------------------------------------------
* JobCondPassSig --
* Pass a signal to a job if the job is remote or if USE_PGRP
* is defined.
*
* Results:
* === 0
*
* Side Effects:
* None, except the job may bite it.
*
*-----------------------------------------------------------------------
*/
static int
JobCondPassSig(jobp, signop)
ClientData jobp; /* Job to biff */
ClientData signop; /* Signal to send it */
{
Job *job = (Job *) jobp;
int signo = *(int *) signop;
#ifdef RMT_WANTS_SIGNALS
if (job->flags & JOB_REMOTE) {
(void)Rmt_Signal(job, signo);
} else {
KILL(job->pid, signo);
}
#else
/*
* Assume that sending the signal to job->pid will signal any remote
* job as well.
*/
KILL(job->pid, signo);
#endif
return(0);
}
/*-
*-----------------------------------------------------------------------
* JobPassSig --
* Pass a signal on to all remote jobs and 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(signo)
int signo; /* The signal number we've received */
{
int mask;
Lst_ForEach(jobs, JobCondPassSig, (ClientData)(long)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);
} else if ((signo == SIGHUP) || (signo == SIGTERM) || (signo == SIGQUIT)) {
JobInterrupt(FALSE);
}
/*
* Leave gracefully if SIGQUIT, rather than core dumping.
*/
if (signo == SIGQUIT) {
Finish(0);
}
/*
* Send ourselves the signal now we've given the message to everyone else.
* Note we block everything else possible while we're getting the signal.
* This ensures that all our jobs get continued when we wake up before
* we take any other signal.
*/
mask = sigblock(0);
(void) sigsetmask(~0 & ~(1 << (signo-1)));
signal(signo, SIG_DFL);
kill(getpid(), signo);
signo = SIGCONT;
Lst_ForEach(jobs, JobCondPassSig, (ClientData) &signo);
sigsetmask(mask);
signal(signo, JobPassSig);
}
/*-
*-----------------------------------------------------------------------
* 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 (job, pid)
ClientData job; /* job to examine */
ClientData pid; /* process id desired */
{
return ( *(int *) pid - ((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_End 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 (cmdp, jobp)
ClientData cmdp; /* command string to print */
ClientData jobp; /* job for which to print it */
{
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 */
char *cmdTemplate; /* Template to use when printing the
* command */
char *cmdStart; /* Start of expanded command */
LstNode cmdNode; /* Node for replacing the command */
char *cmd = (char *) cmdp;
Job *job = (Job *) jobp;
noSpecials = (noExecute && ! (job->node->type & OP_MAKE));
if (strcmp (cmd, "...") == 0) {
job->node->type |= OP_SAVE_CMDS;
if ((job->flags & JOB_IGNDOTS) == 0) {
job->tailCmds = Lst_Succ (Lst_Member (job->node->commands,
(ClientData)cmd));
return (1);
}
return (0);
}
#define DBPRINTF(fmt, arg) if (DEBUG(JOB)) printf (fmt, arg); fprintf (job->cmdFILE, fmt, arg)
numCommands += 1;
/*
* For debugging, we replace each command with the result of expanding
* the variables in the command.
*/
cmdNode = Lst_Member (job->node->commands, (ClientData)cmd);
cmdStart = cmd = Var_Subst (NULL, cmd, job->node, FALSE);
Lst_Replace (cmdNode, (ClientData)cmdStart);
cmdTemplate = "%s\n";
/*
* Check for leading @' and -'s to control echoing and error checking.
*/
while (*cmd == '@' || *cmd == '-') {
if (*cmd == '@') {
shutUp = TRUE;
} else {
errOff = TRUE;
}
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 (cmd, gn)
ClientData cmd;
ClientData gn;
{
cmd = (ClientData) Var_Subst (NULL, (char *) cmd, (GNode *) gn, FALSE);
(void)Lst_AtEnd (postCommands->commands, cmd);
return (0);
}
/*-
*-----------------------------------------------------------------------
* 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, status)
Job *job; /* job to finish */
union wait status; /* sub-why job went away */
{
Boolean done;
if ((WIFEXITED(status) &&
(((status.w_retcode != 0) && !(job->flags & JOB_IGNERR)))) ||
(WIFSIGNALED(status) && (status.w_termsig != 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...
*/
if (usePipes) {
#ifdef RMT_WILL_WATCH
Rmt_Ignore(job->inPipe);
#else
FD_CLR(job->inPipe, &outputs);
#endif /* RMT_WILL_WATCH */
if (job->outPipe != job->inPipe) {
(void)close (job->outPipe);
}
JobDoOutput (job, TRUE);
(void)close (job->inPipe);
} else {
(void)close (job->outFd);
JobDoOutput (job, TRUE);
}
if (job->cmdFILE != NULL && job->cmdFILE != stdout) {
fclose(job->cmdFILE);
}
done = TRUE;
} else if (WIFEXITED(status) && status.w_retcode != 0) {
/*
* 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. Note we don't
* want to close down any of the streams until we know we're at the
* end.
*/
done = TRUE;
} else {
/*
* No need to close things down or anything.
*/
done = FALSE;
}
if (done ||
WIFSTOPPED(status) ||
(WIFSIGNALED(status) && (status.w_termsig == SIGCONT)) ||
DEBUG(JOB))
{
FILE *out;
if (!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");
} else {
out = stdout;
}
if (WIFEXITED(status)) {
if (status.w_retcode != 0) {
if (usePipes && job->node != lastNode) {
fprintf (out, targFmt, job->node->name);
lastNode = job->node;
}
fprintf (out, "*** Error code %d%s\n", status.w_retcode,
(job->flags & JOB_IGNERR) ? " (ignored)" : "");
if (job->flags & JOB_IGNERR) {
status.w_status = 0;
}
} else if (DEBUG(JOB)) {
if (usePipes && job->node != lastNode) {
fprintf (out, targFmt, job->node->name);
lastNode = job->node;
}
fprintf (out, "*** Completed successfully\n");
}
} else if (WIFSTOPPED(status)) {
if (usePipes && job->node != lastNode) {
fprintf (out, targFmt, job->node->name);
lastNode = job->node;
}
if (! (job->flags & JOB_REMIGRATE)) {
fprintf (out, "*** Stopped -- signal %d\n", status.w_stopsig);
}
job->flags |= JOB_RESUME;
(void)Lst_AtEnd(stoppedJobs, (ClientData)job);
fflush(out);
return;
} else if (status.w_termsig == 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_REMIGRATE|JOB_RESTART)) {
if (usePipes && job->node != lastNode) {
fprintf (out, targFmt, job->node->name);
lastNode = job->node;
}
fprintf (out, "*** Continued\n");
}
if (! (job->flags & JOB_CONTINUING)) {
JobRestart(job);
} else {
Lst_AtEnd(jobs, (ClientData)job);
nJobs += 1;
if (! (job->flags & JOB_REMOTE)) {
nLocal += 1;
}
if (nJobs == maxJobs) {
jobFull = TRUE;
if (DEBUG(JOB)) {
printf("Job queue is full.\n");
}
}
}
fflush(out);
return;
} else {
if (usePipes && job->node != lastNode) {
fprintf (out, targFmt, job->node->name);
lastNode = job->node;
}
fprintf (out, "*** Signal %d\n", status.w_termsig);
}
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 ((status.w_status == 0) &&
!Lst_IsAtEnd (job->node->commands))
{
switch (JobStart (job->node,
job->flags & JOB_IGNDOTS,
job))
{
case JOB_RUNNING:
done = FALSE;
break;
case JOB_ERROR:
done = TRUE;
status.w_retcode = 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;
}
} else {
done = TRUE;
}
if (done &&
(aborting != ABORT_ERROR) &&
(aborting != ABORT_INTERRUPT) &&
(status.w_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 != NILLNODE) {
Lst_ForEachFrom (job->node->commands, job->tailCmds,
JobSaveCommand,
(ClientData)job->node);
}
job->node->made = MADE;
Make_Update (job->node);
free((Address)job);
} else if (status.w_status) {
errors += 1;
free((Address)job);
}
while (!errors && !jobFull && !Lst_IsEmpty(stoppedJobs)) {
JobRestart((Job *)Lst_DeQueue(stoppedJobs));
}
/*
* 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.
*/
(void) unlink (tfile);
Finish (errors);
}
}
/*-
*-----------------------------------------------------------------------
* Job_Touch --
* Touch the given target. Called by JobStart when the -t flag was
* given
*
* 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 (gn, silent)
GNode *gn; /* the node of the file to touch */
Boolean silent; /* TRUE if should not print messages */
{
int streamID; /* ID of stream opened to do the touch */
struct timeval times[2]; /* Times for utimes() 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) {
printf ("touch %s\n", gn->name);
}
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[0].tv_sec = times[1].tv_sec = now;
times[0].tv_usec = times[1].tv_usec = 0;
if (utimes(file, times) < 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, 0L, L_SET);
write(streamID, &c, 1);
}
(void)close (streamID);
} else
printf("*** couldn't touch %s: %s", file, strerror(errno));
}
}
}
/*-
*-----------------------------------------------------------------------
* 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 (gn, abortProc)
GNode *gn; /* The target whose commands need
* verifying */
void (*abortProc) __P((char *, ...));
/* Function to abort with message */
{
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 != NILGNODE) && !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);
if (p1)
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.
*/
if (gn->type & OP_OPTIONAL) {
printf ("make: don't know how to make %s (ignored)\n",
gn->name);
} else if (keepgoing) {
printf ("make: don't know how to make %s (continuing)\n",
gn->name);
return (FALSE);
} else {
(*abortProc) ("make: don't know how to make %s. Stop",
gn->name);
return(FALSE);
}
}
}
return (TRUE);
}
#ifdef RMT_WILL_WATCH
/*-
*-----------------------------------------------------------------------
* JobLocalInput --
* Handle a pipe becoming readable. Callback function for Rmt_Watch
*
* Results:
* None
*
* Side Effects:
* JobDoOutput is called.
*
*-----------------------------------------------------------------------
*/
/*ARGSUSED*/
static void
JobLocalInput(stream, job)
int stream; /* Stream that's ready (ignored) */
Job *job; /* Job to which the stream belongs */
{
JobDoOutput(job, FALSE);
}
#endif /* RMT_WILL_WATCH */
/*-
*-----------------------------------------------------------------------
* 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, argv)
Job *job; /* Job to execute */
char **argv;
{
int cpid; /* ID of new child */
if (DEBUG(JOB)) {
int i;
printf("Running %s %sly\n", job->node->name,
job->flags&JOB_REMOTE?"remote":"local");
printf("\tCommand: ");
for (i = 0; argv[i] != (char *)NULL; i++) {
printf("%s ", argv[i]);
}
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 ((lastNode != job->node) && (job->flags & JOB_FIRST) &&
!(job->flags & JOB_SILENT))
{
printf(targFmt, job->node->name);
lastNode = job->node;
}
#ifdef RMT_NO_EXEC
if (job->flags & JOB_REMOTE) {
goto jobExecFinish;
}
#endif /* RMT_NO_EXEC */
if ((cpid = vfork()) == -1) {
Punt ("Cannot fork");
} else if (cpid == 0) {
/*
* Must duplicate the input stream down to the child's input and
* reset it to the beginning (again). Since the stream was marked
* close-on-exec, we must clear that bit in the new input.
*/
(void) dup2(fileno(job->cmdFILE), 0);
fcntl(0, F_SETFD, 0);
lseek(0, 0, L_SET);
if (usePipes) {
/*
* Set up the child's output to be routed through the pipe
* we've created for it.
*/
(void) dup2 (job->outPipe, 1);
} else {
/*
* We're capturing output in a file, so we duplicate the
* descriptor to the temporary file into the standard
* output.
*/
(void) dup2 (job->outFd, 1);
}
/*
* 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);
(void) dup2 (1, 2);
#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.
*/
(void) setpgrp(0, getpid());
#endif USE_PGRP
(void) execv (shellPath, argv);
(void) write (2, "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
*/
job->curPos = 0;
#ifdef RMT_WILL_WATCH
Rmt_Watch(job->inPipe, JobLocalInput, job);
#else
FD_SET(job->inPipe, &outputs);
#endif /* RMT_WILL_WATCH */
}
if (job->flags & JOB_REMOTE) {
job->rmtID = 0;
} else {
nLocal += 1;
/*
* XXX: Used to not happen if CUSTOMS. Why?
*/
if (job->cmdFILE != stdout) {
fclose(job->cmdFILE);
job->cmdFILE = NULL;
}
}
}
#ifdef RMT_NO_EXEC
jobExecFinish:
#endif
/*
* Now the job is actually running, add it to the table.
*/
nJobs += 1;
(void)Lst_AtEnd (jobs, (ClientData)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, argv)
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.
*/
(void)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] = (char *)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 *job; /* Job to restart */
{
if (job->flags & JOB_REMIGRATE) {
if (DEBUG(JOB)) {
printf("Remigrating %x\n", job->pid);
}
if (nLocal != maxLocal) {
/*
* Job cannot be remigrated, but there's room on the local
* machine, so resume the job and note that another
* local job has started.
*/
if (DEBUG(JOB)) {
printf("resuming on local machine\n");
}
KILL(job->pid, SIGCONT);
nLocal +=1;
job->flags &= ~(JOB_REMIGRATE|JOB_RESUME);
} else {
/*
* Job cannot be restarted. Mark the table as full and
* place the job back on the list of stopped jobs.
*/
if (DEBUG(JOB)) {
printf("holding\n");
}
(void)Lst_AtFront(stoppedJobs, (ClientData)job);
jobFull = TRUE;
if (DEBUG(JOB)) {
printf("Job queue is full.\n");
}
return;
}
(void)Lst_AtEnd(jobs, (ClientData)job);
nJobs += 1;
if (nJobs == maxJobs) {
jobFull = TRUE;
if (DEBUG(JOB)) {
printf("Job queue is full.\n");
}
}
} else if (job->flags & JOB_RESTART) {
/*
* Set up the control arguments to the shell. This is based on the
* flags set earlier for this job. If the JOB_IGNERR flag is clear,
* the 'exit' flag of the commandShell is used to cause it to exit
* upon receiving an error. If the JOB_SILENT flag is clear, the
* 'echo' flag of the commandShell is used to get it to start echoing
* as soon as it starts processing commands.
*/
char *argv[4];
JobMakeArgv(job, argv);
if (DEBUG(JOB)) {
printf("Restarting %s...", job->node->name);
}
if (((nLocal >= maxLocal) && ! (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
*/
if (DEBUG(JOB)) {
printf("holding\n");
}
(void)Lst_AtFront(stoppedJobs, (ClientData)job);
jobFull = TRUE;
if (DEBUG(JOB)) {
printf("Job queue is full.\n");
}
return;
} else {
/*
* Job may be run locally.
*/
if (DEBUG(JOB)) {
printf("running locally\n");
}
job->flags &= ~JOB_REMOTE;
}
JobExec(job, argv);
} else {
/*
* The job has stopped and needs to be restarted. Why it stopped,
* we don't know...
*/
if (DEBUG(JOB)) {
printf("Resuming %s...", job->node->name);
}
if (((job->flags & JOB_REMOTE) ||
(nLocal < maxLocal) ||
(((job->flags & JOB_SPECIAL)) &&
(maxLocal == 0))) &&
(nJobs != maxJobs))
{
/*
* If the job is remote, it's ok to resume it as long as the
* maximum concurrency won't be exceeded. If it's local and
* we haven't reached the local concurrency limit already (or the
* job must be run locally and maxLocal is 0), it's also ok to
* resume it.
*/
Boolean error;
extern int errno;
union wait status;
#ifdef RMT_WANTS_SIGNALS
if (job->flags & JOB_REMOTE) {
error = !Rmt_Signal(job, SIGCONT);
} else
#endif /* RMT_WANTS_SIGNALS */
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;
status.w_termsig = SIGCONT;
JobFinish(job, status);
job->flags &= ~(JOB_RESUME|JOB_CONTINUING);
if (DEBUG(JOB)) {
printf("done\n");
}
} else {
Error("couldn't resume %s: %s",
job->node->name, strerror(errno));
status.w_status = 0;
status.w_retcode = 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.
*/
if (DEBUG(JOB)) {
printf("table full\n");
}
(void)Lst_AtFront(stoppedJobs, (ClientData)job);
jobFull = TRUE;
if (DEBUG(JOB)) {
printf("Job queue is full.\n");
}
}
}
}
/*-
*-----------------------------------------------------------------------
* JobStart --
* Start a target-creation process going for the target described
* by the graph node gn.
*
* Results:
* JOB_ERROR if there was an error in the commands, JOB_FINISHED
* if there isn't actually anything left to do for the job and
* JOB_RUNNING if the job has been started.
*
* Side Effects:
* A new Job node is created and added to the list of running
* jobs. PMake is forked and a child shell created.
*-----------------------------------------------------------------------
*/
static int
JobStart (gn, flags, previous)
GNode *gn; /* target to create */
int flags; /* flags for the job to override normal ones.
* e.g. JOB_SPECIAL or JOB_IGNDOTS */
Job *previous; /* The previous Job structure for this node,
* if any. */
{
register Job *job; /* new job descriptor */
char *argv[4]; /* Argument vector to shell */
static int jobno = 0; /* job number of catching output in a file */
Boolean cmdsOK; /* true if the nodes commands were all right */
Boolean local; /* Set true if the job was run locally */
Boolean noExec; /* Set true if we decide not to run the job */
if (previous != (Job *)NULL) {
previous->flags &= ~ (JOB_FIRST|JOB_IGNERR|JOB_SILENT|JOB_REMOTE);
job = previous;
} else {
job = (Job *) emalloc (sizeof (Job));
if (job == (Job *)NULL) {
Punt("JobStart out of memory");
}
flags |= JOB_FIRST;
}
job->node = gn;
job->tailCmds = NILLNODE;
/*
* 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 (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();
}
job->cmdFILE = fopen (tfile, "w+");
if (job->cmdFILE == (FILE *) NULL) {
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) && (Lst_Open(gn->commands) != SUCCESS)){
cmdsOK = FALSE;
} else {
LstNode ln = Lst_Next (gn->commands);
if ((ln == NILLNODE) ||
JobPrintCommand ((char *)Lst_Datum (ln), job))
{
noExec = TRUE;
Lst_Close (gn->commands);
}
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...
*/
if (usePipes) {
#ifdef RMT_WILL_WATCH
Rmt_Ignore(job->inPipe);
#else
FD_CLR(job->inPipe, &outputs);
#endif
if (job->outPipe != job->inPipe) {
(void)close (job->outPipe);
}
JobDoOutput (job, TRUE);
(void)close (job->inPipe);
} else {
(void)close (job->outFd);
JobDoOutput (job, TRUE);
}
}
}
} else {
/*
* We can do all the commands at once. hooray for sanity
*/
numCommands = 0;
Lst_ForEach (gn->commands, JobPrintCommand, (ClientData)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) {
printf (targFmt, gn->name);
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, (ClientData)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) {
(void) unlink (tfile);
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 != NILLNODE) {
Lst_ForEachFrom(job->node->commands, job->tailCmds,
JobSaveCommand,
(ClientData)job->node);
}
Make_Update(job->node);
}
free((Address)job);
return(JOB_FINISHED);
} else {
free((Address)job);
return(JOB_ERROR);
}
} else {
fflush (job->cmdFILE);
(void) unlink (tfile);
}
/*
* 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. This is just
* tfile with two extra digits tacked on -- jobno.
*/
if (job->flags & JOB_FIRST) {
if (usePipes) {
int fd[2];
(void) pipe(fd);
job->inPipe = fd[0];
job->outPipe = fd[1];
(void)fcntl (job->inPipe, F_SETFD, 1);
(void)fcntl (job->outPipe, F_SETFD, 1);
} else {
printf ("Remaking `%s'\n", gn->name);
fflush (stdout);
sprintf (job->outFile, "%s%02d", tfile, jobno);
jobno = (jobno + 1) % 100;
job->outFd = open(job->outFile,O_WRONLY|O_CREAT|O_APPEND,0600);
(void)fcntl (job->outFd, F_SETFD, 1);
}
}
local = TRUE;
if (local && (((nLocal >= maxLocal) &&
!(job->flags & JOB_SPECIAL) &&
(maxLocal != 0))))
{
/*
* The job can only be run locally, but we've hit the limit of
* local concurrency, so put the job on hold until some other job
* finishes. Note that the special jobs (.BEGIN, .INTERRUPT and .END)
* may be run locally even when the local limit has been reached
* (e.g. when maxLocal == 0), though they will be exported if at
* all possible.
*/
jobFull = TRUE;
if (DEBUG(JOB)) {
printf("Can only run job locally.\n");
}
job->flags |= JOB_RESTART;
(void)Lst_AtEnd(stoppedJobs, (ClientData)job);
} else {
if ((nLocal >= maxLocal) && local) {
/*
* If we're running this job locally as a special case (see above),
* at least say the table is full.
*/
jobFull = TRUE;
if (DEBUG(JOB)) {
printf("Local job queue is full.\n");
}
}
JobExec(job, argv);
}
return(JOB_RUNNING);
}
/*-
*-----------------------------------------------------------------------
* 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, finish)
register Job *job; /* the job whose output needs printing */
Boolean finish; /* TRUE if this is the last time we'll be
* called for this job */
{
Boolean gotNL = FALSE; /* true if got a newline */
register int nr; /* number of bytes read */
register int i; /* auxiliary index into outBuf */
register 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:
nRead = read (job->inPipe, &job->outBuf[job->curPos],
JOB_BUFSIZE - job->curPos);
if (nRead < 0) {
if (DEBUG(JOB)) {
perror("JobDoOutput(piperead)");
}
nr = 0;
} else {
nr = nRead;
}
/*
* If we hit the end-of-file (the job is dead), we must flush its
* remaining output, so pretend we read a newline if there's any
* output remaining in the buffer.
* Also clear the 'finish' flag so we stop looping.
*/
if ((nr == 0) && (job->curPos != 0)) {
job->outBuf[job->curPos] = '\n';
nr = 1;
finish = FALSE;
} else if (nr == 0) {
finish = FALSE;
}
/*
* Look for the last newline in the bytes we just got. If there is
* one, break out of the loop with 'i' as its index and gotNL set
* TRUE.
*/
max = job->curPos + nr;
for (i = job->curPos + nr - 1; i >= job->curPos; i--) {
if (job->outBuf[i] == '\n') {
gotNL = TRUE;
break;
} else if (job->outBuf[i] == '\0') {
/*
* 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.
*/
gotNL = TRUE;
i = job->curPos;
}
}
if (gotNL) {
/*
* 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, preceeded
* 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) {
register char *cp, *ecp;
cp = job->outBuf;
if (commandShell->noPrint) {
ecp = Str_FindSubstring(job->outBuf,
commandShell->noPrint);
while (ecp != (char *)NULL) {
if (cp != ecp) {
*ecp = '\0';
if (job->node != lastNode) {
printf (targFmt, job->node->name);
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.
*/
printf ("%s", cp);
}
cp = ecp + commandShell->noPLen;
if (cp != &job->outBuf[i]) {
/*
* Still more to print, look again after skipping
* the whitespace following the non-printable
* command....
*/
cp++;
while (*cp == ' ' || *cp == '\t' || *cp == '\n') {
cp++;
}
ecp = Str_FindSubstring (cp,
commandShell->noPrint);
} else {
break;
}
}
}
/*
* 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) {
printf (targFmt, job->node->name);
lastNode = job->node;
}
printf ("%s\n", cp);
}
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 != (FILE *) NULL) {
printf ("Results of making %s:\n", job->node->name);
while (fgets (inLine, sizeof(inLine), oFILE) != NULL) {
register char *cp, *ecp, *endp;
cp = inLine;
endp = inLine + strlen(inLine);
if (endp[-1] == '\n') {
*--endp = '\0';
}
if (commandShell->noPrint) {
ecp = Str_FindSubstring(cp, commandShell->noPrint);
while (ecp != (char *)NULL) {
if (cp != ecp) {
*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.
*/
printf ("%s", cp);
}
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 = Str_FindSubstring(cp, commandShell->noPrint);
} else {
break;
}
}
}
/*
* 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') {
printf ("%s\n", cp);
}
}
fclose (oFILE);
(void) unlink (job->outFile);
}
}
fflush(stdout);
}
/*-
*-----------------------------------------------------------------------
* 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 (block)
Boolean block; /* TRUE if should block on the wait. */
{
int pid; /* pid of dead child */
register Job *job; /* job descriptor for dead child */
LstNode jnode; /* list element for finding job */
union wait status; /* Exit/termination status */
/*
* Don't even bother if we know there's no one around.
*/
if (nLocal == 0) {
return;
}
while ((pid = wait3((int *)&status, (block?0:WNOHANG)|WUNTRACED,
(struct rusage *)0)) > 0)
{
if (DEBUG(JOB))
printf("Process %d exited or stopped.\n", pid);
jnode = Lst_Find (jobs, (ClientData)&pid, JobCmpPid);
if (jnode == NILLNODE) {
if (WIFSIGNALED(status) && (status.w_termsig == SIGCONT)) {
jnode = Lst_Find(stoppedJobs, (ClientData) &pid, JobCmpPid);
if (jnode == NILLNODE) {
Error("Resumed child (%d) not in table", pid);
continue;
}
job = (Job *)Lst_Datum(jnode);
(void)Lst_Remove(stoppedJobs, jnode);
} else {
Error ("Child (%d) not in table?", pid);
continue;
}
} else {
job = (Job *) Lst_Datum (jnode);
(void)Lst_Remove (jobs, jnode);
nJobs -= 1;
if (jobFull && DEBUG(JOB)) {
printf("Job queue is no longer full.\n");
}
jobFull = FALSE;
nLocal -= 1;
}
JobFinish (job, status);
}
}
/*-
*-----------------------------------------------------------------------
* Job_CatchOutput --
* Catch the output from our children, if we're using
* pipes do so. Otherwise just block time until we get a
* signal (most likely a SIGCHLD) since there's no point in
* just spinning when there's nothing to do and the reaping
* of a child can wait for a while.
*
* Results:
* None
*
* Side Effects:
* Output is read from pipes if we're piping.
* -----------------------------------------------------------------------
*/
void
Job_CatchOutput ()
{
int nfds;
struct timeval timeout;
fd_set readfds;
register LstNode ln;
register Job *job;
#ifdef RMT_WILL_WATCH
int pnJobs; /* Previous nJobs */
#endif
fflush(stdout);
#ifdef RMT_WILL_WATCH
pnJobs = nJobs;
/*
* It is possible for us to be called with nJobs equal to 0. This happens
* if all the jobs finish and a job that is stopped cannot be run
* locally (eg if maxLocal is 0) and cannot be exported. The job will
* be placed back on the stoppedJobs queue, Job_Empty() will return false,
* Make_Run will call us again when there's nothing for which to wait.
* nJobs never changes, so we loop forever. Hence the check. It could
* be argued that we should sleep for a bit so as not to swamp the
* exportation system with requests. Perhaps we should.
*
* NOTE: IT IS THE RESPONSIBILITY OF Rmt_Wait TO CALL Job_CatchChildren
* IN A TIMELY FASHION TO CATCH ANY LOCALLY RUNNING JOBS THAT EXIT.
* It may use the variable nLocal to determine if it needs to call
* Job_CatchChildren (if nLocal is 0, there's nothing for which to
* wait...)
*/
while (nJobs != 0 && pnJobs == nJobs) {
Rmt_Wait();
}
#else
if (usePipes) {
readfds = outputs;
timeout.tv_sec = SEL_SEC;
timeout.tv_usec = SEL_USEC;
if ((nfds = select (FD_SETSIZE, &readfds, (fd_set *) 0, (fd_set *) 0, &timeout)) < 0)
{
return;
} else {
if (Lst_Open (jobs) == FAILURE) {
Punt ("Cannot open job table");
}
while (nfds && (ln = Lst_Next (jobs)) != NILLNODE) {
job = (Job *) Lst_Datum (ln);
if (FD_ISSET(job->inPipe, &readfds)) {
JobDoOutput (job, FALSE);
nfds -= 1;
}
}
Lst_Close (jobs);
}
}
#endif /* RMT_WILL_WATCH */
}
/*-
*-----------------------------------------------------------------------
* 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 (gn)
GNode *gn;
{
(void)JobStart (gn, 0, (Job *)NULL);
}
/*-
*-----------------------------------------------------------------------
* Job_Init --
* Initialize the process module
*
* Results:
* none
*
* Side Effects:
* lists and counters are initialized
*-----------------------------------------------------------------------
*/
void
Job_Init (maxproc, maxlocal)
int maxproc; /* the greatest number of jobs which may be
* running at one time */
int maxlocal; /* the greatest number of local jobs which may
* be running at once. */
{
GNode *begin; /* node for commands to do at the very start */
sprintf (tfile, "/tmp/make%05d", getpid());
jobs = Lst_Init (FALSE);
stoppedJobs = Lst_Init(FALSE);
maxJobs = maxproc;
maxLocal = maxlocal;
nJobs = 0;
nLocal = 0;
jobFull = FALSE;
aborting = 0;
errors = 0;
lastNode = NILGNODE;
if (maxJobs == 1) {
/*
* If only one job can run at a time, there's no need for a banner,
* no is there?
*/
targFmt = "";
} else {
targFmt = TARG_FMT;
}
if (shellPath == (char *) 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);
}
if (commandShell->exit == (char *)NULL) {
commandShell->exit = "";
}
if (commandShell->echo == (char *)NULL) {
commandShell->echo = "";
}
/*
* Catch the four signals that POSIX specifies if they aren't ignored.
* JobPassSig will take care of calling JobInterrupt if appropriate.
*/
if (signal (SIGINT, SIG_IGN) != SIG_IGN) {
signal (SIGINT, JobPassSig);
}
if (signal (SIGHUP, SIG_IGN) != SIG_IGN) {
signal (SIGHUP, JobPassSig);
}
if (signal (SIGQUIT, SIG_IGN) != SIG_IGN) {
signal (SIGQUIT, JobPassSig);
}
if (signal (SIGTERM, SIG_IGN) != SIG_IGN) {
signal (SIGTERM, JobPassSig);
}
/*
* 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(RMT_WANTS_SIGNALS) || defined(USE_PGRP)
if (signal (SIGTSTP, SIG_IGN) != SIG_IGN) {
signal (SIGTSTP, JobPassSig);
}
if (signal (SIGTTOU, SIG_IGN) != SIG_IGN) {
signal (SIGTTOU, JobPassSig);
}
if (signal (SIGTTIN, SIG_IGN) != SIG_IGN) {
signal (SIGTTIN, JobPassSig);
}
if (signal (SIGWINCH, SIG_IGN) != SIG_IGN) {
signal (SIGWINCH, JobPassSig);
}
#endif
begin = Targ_FindNode (".BEGIN", TARG_NOCREATE);
if (begin != NILGNODE) {
JobStart (begin, JOB_SPECIAL, (Job *)0);
while (nJobs) {
Job_CatchOutput();
#ifndef RMT_WILL_WATCH
Job_CatchChildren (!usePipes);
#endif /* RMT_WILL_WATCH */
}
}
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 ()
{
return (aborting || jobFull);
}
/*-
*-----------------------------------------------------------------------
* Job_Empty --
* See if the job table is empty. Because the local concurrency may
* be set to 0, it is possible for the job table to become empty,
* while the list of stoppedJobs remains non-empty. In such a case,
* we want to restart as many jobs as we can.
*
* Results:
* TRUE if it is. FALSE if it ain't.
*
* Side Effects:
* None.
*
* -----------------------------------------------------------------------
*/
Boolean
Job_Empty ()
{
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;
while (!jobFull && !Lst_IsEmpty(stoppedJobs)) {
JobRestart((Job *)Lst_DeQueue(stoppedJobs));
}
return(FALSE);
} else {
return(TRUE);
}
} else {
return(FALSE);
}
}
/*-
*-----------------------------------------------------------------------
* JobMatchShell --
* Find a matching shell in 'shells' given its final component.
*
* Results:
* A pointer to the Shell structure.
*
* Side Effects:
* None.
*
*-----------------------------------------------------------------------
*/
static Shell *
JobMatchShell (name)
char *name; /* Final component of shell path */
{
register Shell *sh; /* Pointer into shells table */
Shell *match; /* Longest-matching shell */
register char *cp1,
*cp2;
char *eoname;
eoname = name + strlen (name);
match = (Shell *) NULL;
for (sh = shells; sh->name != NULL; sh++) {
for (cp1 = eoname - strlen (sh->name), cp2 = sh->name;
*cp1 != '\0' && *cp1 == *cp2;
cp1++, cp2++) {
continue;
}
if (*cp1 != *cp2) {
continue;
} else if (match == (Shell *) NULL ||
strlen (match->name) < strlen (sh->name)) {
match = sh;
}
}
return (match == (Shell *) NULL ? sh : match);
}
/*-
*-----------------------------------------------------------------------
* 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 (line)
char *line; /* The shell spec */
{
char **words;
int wordCount;
register char **argv;
register int argc;
char *path;
Shell newShell;
Boolean fullSpec = FALSE;
while (isspace (*line)) {
line++;
}
words = brk_string (line, &wordCount, TRUE);
memset ((Address)&newShell, 0, sizeof(newShell));
/*
* Parse the specification by keyword
*/
for (path = (char *)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;
}
}
if (path == (char *)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 == (char *)NULL) {
Parse_Error (PARSE_FATAL, "Neither path nor name specified");
return (FAILURE);
} else {
commandShell = JobMatchShell (newShell.name);
shellName = newShell.name;
}
} 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 == (char *)NULL) {
path = shellPath;
} else {
path += 1;
}
if (newShell.name != (char *)NULL) {
shellName = newShell.name;
} else {
shellName = path;
}
if (!fullSpec) {
commandShell = JobMatchShell (shellName);
} else {
commandShell = (Shell *) emalloc(sizeof(Shell));
*commandShell = newShell;
}
}
if (commandShell->echoOn && commandShell->echoOff) {
commandShell->hasEchoCtl = TRUE;
}
if (!commandShell->hasErrCtl) {
if (commandShell->errCheck == (char *)NULL) {
commandShell->errCheck = "";
}
if (commandShell->ignErr == (char *)NULL) {
commandShell->ignErr = "%s\n";
}
}
/*
* Do not free up the words themselves, since they might be in use by the
* shell specification...
*/
free (words);
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 (runINTERRUPT)
int runINTERRUPT; /* Non-zero if commands for the .INTERRUPT
* target should be executed */
{
LstNode ln; /* element in job table */
Job *job; /* job descriptor in that element */
GNode *interrupt; /* the node describing the .INTERRUPT target */
aborting = ABORT_INTERRUPT;
(void)Lst_Open (jobs);
while ((ln = Lst_Next (jobs)) != NILLNODE) {
job = (Job *) Lst_Datum (ln);
if (!Targ_Precious (job->node)) {
char *file = (job->node->path == (char *)NULL ?
job->node->name :
job->node->path);
struct stat st;
if (!noExecute && lstat(file, &st) != -1 && !S_ISDIR(st.st_mode) &&
unlink(file) != -1) {
Error ("*** %s removed", file);
}
}
#ifdef RMT_WANTS_SIGNALS
if (job->flags & JOB_REMOTE) {
/*
* If job is remote, let the Rmt module do the killing.
*/
if (!Rmt_Signal(job, SIGINT)) {
/*
* If couldn't kill the thing, finish it out now with an
* error code, since no exit report will come in likely.
*/
union wait status;
status.w_status = 0;
status.w_retcode = 1;
JobFinish(job, status);
}
} else if (job->pid) {
KILL(job->pid, SIGINT);
}
#else
if (job->pid) {
KILL(job->pid, SIGINT);
}
#endif /* RMT_WANTS_SIGNALS */
}
Lst_Close (jobs);
if (runINTERRUPT && !touchFlag) {
interrupt = Targ_FindNode (".INTERRUPT", TARG_NOCREATE);
if (interrupt != NILGNODE) {
ignoreErrors = FALSE;
JobStart (interrupt, JOB_IGNDOTS, (Job *)0);
while (nJobs) {
Job_CatchOutput();
#ifndef RMT_WILL_WATCH
Job_CatchChildren (!usePipes);
#endif /* RMT_WILL_WATCH */
}
}
}
(void) unlink (tfile);
exit (0);
}
/*
*-----------------------------------------------------------------------
* Job_End --
* Do final processing such as the running of the commands
* attached to the .END target.
*
* Results:
* Number of errors reported.
*
* Side Effects:
* The process' temporary file (tfile) is removed if it still
* existed.
*-----------------------------------------------------------------------
*/
int
Job_End ()
{
if (postCommands != NILGNODE && !Lst_IsEmpty (postCommands->commands)) {
if (errors) {
Error ("Errors reported so .END ignored");
} else {
JobStart (postCommands, JOB_SPECIAL | JOB_IGNDOTS,
(Job *)0);
while (nJobs) {
Job_CatchOutput();
#ifndef RMT_WILL_WATCH
Job_CatchChildren (!usePipes);
#endif /* RMT_WILL_WATCH */
}
}
}
(void) unlink (tfile);
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()
{
aborting = ABORT_WAIT;
while (nJobs != 0) {
Job_CatchOutput();
#ifndef RMT_WILL_WATCH
Job_CatchChildren(!usePipes);
#endif /* RMT_WILL_WATCH */
}
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 ()
{
LstNode ln; /* element in job table */
Job *job; /* the job descriptor in that element */
int foo;
aborting = ABORT_ERROR;
if (nJobs) {
(void)Lst_Open (jobs);
while ((ln = Lst_Next (jobs)) != NILLNODE) {
job = (Job *) Lst_Datum (ln);
/*
* kill the child process with increasingly drastic signals to make
* darn sure it's dead.
*/
#ifdef RMT_WANTS_SIGNALS
if (job->flags & JOB_REMOTE) {
Rmt_Signal(job, SIGINT);
Rmt_Signal(job, SIGKILL);
} else {
KILL(job->pid, SIGINT);
KILL(job->pid, SIGKILL);
}
#else
KILL(job->pid, SIGINT);
KILL(job->pid, SIGKILL);
#endif /* RMT_WANTS_SIGNALS */
}
}
/*
* Catch as many children as want to report in at first, then give up
*/
while (wait3(&foo, WNOHANG, (struct rusage *)0) > 0)
continue;
(void) unlink (tfile);
}
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