src/procmgmt/procmgmt_unix.c

   1 /*
   2  * Copyright 2000, International Business Machines Corporation and others.
   3  * All Rights Reserved.
   4  *
   5  * This software has been released under the terms of the IBM Public
   6  * License.  For details, see the LICENSE file in the top-level source
   7  * directory or online at http://www.openafs.org/dl/license10.html
   8  */
   9
  10 #include <afsconfig.h>
  11 #include <afs/param.h>
  12 #include <afs/stds.h>
  13
  14 #include <roken.h>
  15
  16 #include "procmgmt.h"
  17 #include "pmgtprivate.h"
  18
  19
  20 /* -----------------  Processes  ---------------- */
  21
  22
  23 /*
  24  * pmgt_ProcessSpawnVE() -- Spawn a process (Unix fork()/execve() semantics)
  25  *
  26  *     Returns pid of the child process ((pid_t)-1 on failure with errno set).
  27  *
  28  *     Notes: A senvp value of NULL results in Unix fork()/execv() semantics.
  29  *            Open files are not inherited, except stdin, stdout, and stderr.
  30  *            If child fails to exec() spath, its exit code is estatus.
  31  *
  32  * If provided, a signal mask will be set for the spawned process.
  33  *
  34  * ASSUMPTIONS: sargv[0] is the same as spath (or its last component).
  35  */
  36 pid_t
  37 pmgt_ProcessSpawnVE(const char *spath, char *sargv[], char *senvp[],
  38                     int estatus, sigset_t *mask)
  39 {
  40     pid_t pid;
  41
  42     /* create child process to exec spath */
  43     if ((pid = fork()) == 0) {
  44         /* child process */
  45         int i;
  46
  47         /* close random fd's above stderr */
  48         for (i = 3; i < 64; i++) {
  49             close(i);
  50         }
  51
  52         sigprocmask(SIG_SETMASK, mask, NULL);
  53
  54         if (senvp) {
  55             execve(spath, sargv, senvp);
  56         } else {
  57             execv(spath, sargv);
  58         }
  59
  60         /* this point is only reached if exec() failed */
  61         exit(estatus);
  62     } else {
  63         /* parent process */
  64         return pid;
  65     }
  66 }