84 строки
1.9 KiB
C
84 строки
1.9 KiB
C
/*
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* Copyright (c) 2004-2005 The Trustees of Indiana University and Indiana
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* University Research and Technology
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* Corporation. All rights reserved.
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* Copyright (c) 2004-2005 The University of Tennessee and The University
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* of Tennessee Research Foundation. All rights
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* reserved.
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* Copyright (c) 2004-2005 High Performance Computing Center Stuttgart,
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* University of Stuttgart. All rights reserved.
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* Copyright (c) 2004-2005 The Regents of the University of California.
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* All rights reserved.
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* $COPYRIGHT$
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*
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* Additional copyrights may follow
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*
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* $HEADER$
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*/
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#include "opal_config.h"
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#include <stdio.h>
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#include <errno.h>
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#ifdef HAVE_SYS_WAIT_H
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#include <sys/wait.h>
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#endif
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#include <stdlib.h>
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#ifdef HAVE_UNISTD_H
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#include <unistd.h>
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#endif
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#include "opal/util/few.h"
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#include "opal/util/basename.h"
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#include "opal/util/argv.h"
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#include "opal/constants.h"
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int opal_few(char *argv[], int *status)
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{
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#if defined(HAVE_FORK) && defined(HAVE_EXECVE) && defined(HAVE_WAITPID)
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pid_t pid, ret;
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if ((pid = fork()) < 0) {
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return OPAL_ERR_IN_ERRNO;
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}
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/* Child execs. If it fails to exec, exit. */
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else if (0 == pid) {
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execvp(argv[0], argv);
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exit(errno);
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}
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/* Parent loops waiting for the child to die. */
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else {
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do {
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/* If the child exited, return */
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if (pid == (ret = waitpid(pid, status, 0))) {
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break;
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}
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/* If waitpid was interrupted, loop around again */
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else if (ret < 0) {
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if (EINTR == errno) {
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continue;
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}
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/* Otherwise, some bad juju happened -- need to quit */
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return OPAL_ERR_IN_ERRNO;
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}
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} while (true);
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}
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/* Return the status to the caller */
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return OPAL_SUCCESS;
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#else
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return OPAL_ERR_NOT_SUPPORTED;
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#endif
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}
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