sysdeps/unix/sysv/aix/waitid.c

   1 /* Pseudo implementation of waitid.
   2    Copyright (C) 1997, 1998, 2000, 2002 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4    Contributed by Zack Weinberg <zack@rabi.phys.columbia.edu>, 1997.
   5
   6    The GNU C Library is free software; you can redistribute it and/or
   7    modify it under the terms of the GNU Lesser General Public
   8    License as published by the Free Software Foundation; either
   9    version 2.1 of the License, or (at your option) any later version.
  10
  11    The GNU C Library is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14    Lesser General Public License for more details.
  15
  16    You should have received a copy of the GNU Lesser General Public
  17    License along with the GNU C Library; if not, write to the Free
  18    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  19    02111-1307 USA.  */
  20
  21 #include <errno.h>
  22 #include <signal.h>
  23 #define __need_NULL
  24 #include <stddef.h>
  25 #include <sys/wait.h>
  26 #include <sys/types.h>
  27
  28 #include <assert.h>
  29
  30 extern pid_t kwaitpid (int *stat_loc, pid_t pid, int options,
  31                        struct rusage *ru_loc, siginfo_t *infop);
  32
  33 int
  34 __waitid (idtype, id, infop, options)
  35      idtype_t idtype;
  36      id_t id;
  37      siginfo_t *infop;
  38      int options;
  39 {
  40   pid_t pid, child;
  41   int status;
  42
  43   switch (idtype)
  44     {
  45     case P_PID:
  46       if(id <= 0)
  47         goto invalid;
  48       pid = (pid_t) id;
  49       break;
  50     case P_PGID:
  51       if (id < 0 || id == 1)
  52         goto invalid;
  53       pid = (pid_t) -id;
  54       break;
  55     case P_ALL:
  56       pid = -1;
  57       break;
  58     default:
  59     invalid:
  60       __set_errno (EINVAL);
  61       return -1;
  62     }
  63
  64   /* Technically we're supposed to return EFAULT if infop is bogus,
  65      but that would involve mucking with signals, which is
  66      too much hassle.  User will have to deal with SIGSEGV/SIGBUS.
  67      We just check for a null pointer. */
  68
  69   if (infop == NULL)
  70     {
  71       __set_errno (EFAULT);
  72       return -1;
  73     }
  74
  75   child = kwaitpid (&status, pid, options, NULL, infop);
  76
  77   if (child == -1)
  78     /* `waitpid' set `errno' for us.  */
  79     return -1;
  80
  81   return 0;
  82 }
  83 weak_alias (__waitid, waitid)