libc/sysdeps/linux/common/waitid.c

   1 /* vi: set sw=4 ts=4: */
   2 /*
   3  * Copyright (C) 2007 Erik Andersen <andersen@uclibc.org>
   4  *
   5  * Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball.
   6  */
   7
   8 #include <features.h>
   9
  10 #if defined __USE_SVID || defined __USE_XOPEN
  11 # include <sys/types.h>
  12 # include <sys/wait.h>
  13 # include <sys/syscall.h>
  14 # ifdef __NR_waitid
  15 _syscall4(int, waitid, idtype_t, idtype, id_t, id, siginfo_t*, infop, int, options)
  16 # else
  17 #  include <string.h>
  18 /* libc_hidden_proto(waitpid) */
  19 int waitid(idtype_t idtype, id_t id, siginfo_t *infop, int options)
  20 {
  21         switch (idtype) {
  22                 case P_PID:
  23                         if (id <= 0)
  24                                 goto invalid;
  25                         break;
  26                 case P_PGID:
  27                         if (id < 0 || id == 1)
  28                                 goto invalid;
  29                         id = -id;
  30                         break;
  31                 case P_ALL:
  32                         id = -1;
  33                         break;
  34                 default:
  35                 invalid:
  36                         __set_errno(EINVAL);
  37                         return -1;
  38         }
  39
  40         memset(infop, 0, sizeof *infop);
  41         infop->si_pid = waitpid(id, &infop->si_status, options
  42 #  ifdef WEXITED
  43                                            &~ WEXITED
  44 #  endif
  45                                           );
  46         if (infop->si_pid < 0)
  47                 return infop->si_pid;
  48         return 0;
  49 }
  50 # endif
  51 #endif