openbsd-compat/bsd-waitpid.c

   1 /*
   2  * Copyright (c) 2000 Ben Lindstrom.  All rights reserved.
   3  *
   4  * Redistribution and use in source and binary forms, with or without
   5  * modification, are permitted provided that the following conditions
   6  * are met:
   7  * 1. Redistributions of source code must retain the above copyright
   8  *    notice, this list of conditions and the following disclaimer.
   9  * 2. Redistributions in binary form must reproduce the above copyright
  10  *    notice, this list of conditions and the following disclaimer in the
  11  *    documentation and/or other materials provided with the distribution.
  12  *
  13  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  14  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  15  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  16  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  17  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  18  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  19  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  20  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  21  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  22  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  23  */
  24
  25 #include "includes.h"
  26
  27 #ifndef HAVE_WAITPID
  28 #include <errno.h>
  29 #include <sys/wait.h>
  30 #include "bsd-waitpid.h"
  31
  32 pid_t
  33 waitpid(int pid, int *stat_loc, int options)
  34 {
  35         union wait statusp;
  36         pid_t wait_pid;
  37
  38         if (pid <= 0) {
  39                 if (pid != -1) {
  40                         errno = EINVAL;
  41                         return (-1);
  42                 }
  43                 /* wait4() wants pid=0 for indiscriminate wait. */
  44                 pid = 0;
  45         }
  46         wait_pid = wait4(pid, &statusp, options, NULL);
  47         if (stat_loc)
  48                 *stat_loc = (int) statusp.w_status;
  49
  50         return (wait_pid);
  51 }
  52
  53 #endif /* !HAVE_WAITPID */