opal/util/few.c

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This source file includes following definitions.
opal_few
   1 /*
   2  * Copyright (c) 2004-2005 The Trustees of Indiana University and Indiana
   3  *                         University Research and Technology
   4  *                         Corporation.  All rights reserved.
   5  * Copyright (c) 2004-2005 The University of Tennessee and The University
   6  *                         of Tennessee Research Foundation.  All rights
   7  *                         reserved.
   8  * Copyright (c) 2004-2005 High Performance Computing Center Stuttgart,
   9  *                         University of Stuttgart.  All rights reserved.
  10  * Copyright (c) 2004-2005 The Regents of the University of California.
  11  *                         All rights reserved.
  12  * $COPYRIGHT$
  13  *
  14  * Additional copyrights may follow
  15  *
  16  * $HEADER$
  17  */
  18 
  19 
  20 #include "opal_config.h"
  21 
  22 #include <stdio.h>
  23 #include <errno.h>
  24 #ifdef HAVE_SYS_WAIT_H
  25 #include <sys/wait.h>
  26 #endif
  27 #include <stdlib.h>
  28 #ifdef HAVE_UNISTD_H
  29 #include <unistd.h>
  30 #endif
  31 
  32 #include "opal/util/few.h"
  33 #include "opal/util/basename.h"
  34 #include "opal/util/argv.h"
  35 #include "opal/constants.h"
  36 
  37 int opal_few(char *argv[], int *status)
  38 {
  39 #if defined(HAVE_FORK) && defined(HAVE_EXECVE) && defined(HAVE_WAITPID)
  40     pid_t pid, ret;
  41 
  42     if ((pid = fork()) < 0) {
  43       return OPAL_ERR_IN_ERRNO;
  44     }
  45 
  46     /* Child execs.  If it fails to exec, exit. */
  47 
  48     else if (0 == pid) {
  49       execvp(argv[0], argv);
  50       exit(errno);
  51     }
  52 
  53     /* Parent loops waiting for the child to die. */
  54 
  55     else {
  56       do {
  57         /* If the child exited, return */
  58 
  59         if (pid == (ret = waitpid(pid, status, 0))) {
  60           break;
  61         }
  62 
  63         /* If waitpid was interrupted, loop around again */
  64 
  65         else if (ret < 0) {
  66           if (EINTR == errno) {
  67             continue;
  68           }
  69 
  70           /* Otherwise, some bad juju happened -- need to quit */
  71 
  72           return OPAL_ERR_IN_ERRNO;
  73         }
  74       } while (true);
  75     }
  76 
  77     /* Return the status to the caller */
  78 
  79     return OPAL_SUCCESS;
  80 #else
  81     return OPAL_ERR_NOT_SUPPORTED;
  82 #endif
  83 }
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root/opal/util/few.c

DEFINITIONS
