82fa6eccf9
If SIGCHILD is being ignored, waitpid() will forever error with ECHILD and this loop with never end, so don't loop if it errors with ECHILD.
85 lines
2.7 KiB
C
85 lines
2.7 KiB
C
/*
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* Copyright (c) 2011 , Jonathan Nieder
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. The name of the copyright holders or contributors may not be used to
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* endorse or promote products derived from this software without
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* specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
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* PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <config.h>
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#include <stdio.h>
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#include <sys/types.h>
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#include <sys/wait.h>
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#include <unistd.h>
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#include <errno.h>
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#include <string.h>
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#include "exitcodes.h"
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#include "prototypes.h"
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int run_command (const char *cmd, const char *argv[],
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/*@null@*/const char *envp[], /*@out@*/int *status)
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{
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pid_t pid, wpid;
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if (NULL == envp) {
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envp = (const char **)environ;
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}
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(void) fflush (stdout);
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(void) fflush (stderr);
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pid = fork ();
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if (0 == pid) {
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(void) execve (cmd, (char * const *) argv,
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(char * const *) envp);
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if (ENOENT == errno) {
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exit (E_CMD_NOTFOUND);
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}
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fprintf (stderr, "%s: cannot execute %s: %s\n",
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Prog, cmd, strerror (errno));
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exit (E_CMD_NOEXEC);
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} else if ((pid_t)-1 == pid) {
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fprintf (stderr, "%s: cannot execute %s: %s\n",
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Prog, cmd, strerror (errno));
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return -1;
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}
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do {
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wpid = waitpid (pid, status, 0);
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if ((pid_t)-1 == wpid && errno == ECHILD)
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break;
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} while ( ((pid_t)-1 == wpid && errno == EINTR)
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|| ((pid_t)-1 != wpid && wpid != pid));
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if ((pid_t)-1 == wpid) {
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fprintf (stderr, "%s: waitpid (status: %d): %s\n",
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Prog, *status, strerror (errno));
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return -1;
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}
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return 0;
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}
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