l4/pkg/uclibc/lib/contrib/uclibc/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 <string.h>
  12 # include <sys/types.h>
  13 # include <sys/wait.h>
  14 # include <sys/syscall.h>
  15
  16 # ifdef __NR_waitid
  17 /* The waitid() POSIX interface takes 4 arguments, but the kernel function
  18  * actually takes 5.  The fifth is a pointer to struct rusage.  Make sure
  19  * we pass NULL rather than letting whatever was in the register bleed up.
  20  */
  21 #define __NR_waitid5 __NR_waitid
  22 static _syscall5(int, waitid5, idtype_t, idtype, id_t, id, siginfo_t*, infop,
  23                  int, options, struct rusage*, ru)
  24 # endif
  25
  26 int waitid(idtype_t idtype, id_t id, siginfo_t *infop, int options)
  27 {
  28 # ifdef __NR_waitid
  29         return waitid5(idtype, id, infop, options, NULL);
  30 # else
  31         switch (idtype) {
  32                 case P_PID:
  33                         if (id <= 0)
  34                                 goto invalid;
  35                         break;
  36                 case P_PGID:
  37                         if (id < 0 || id == 1)
  38                                 goto invalid;
  39                         id = -id;
  40                         break;
  41                 case P_ALL:
  42                         id = -1;
  43                         break;
  44                 default:
  45                 invalid:
  46                         __set_errno(EINVAL);
  47                         return -1;
  48         }
  49
  50         memset(infop, 0, sizeof *infop);
  51         infop->si_pid = waitpid(id, &infop->si_status, options
  52 #  ifdef WEXITED
  53                                            &~ WEXITED
  54 #  endif
  55                                           );
  56         if (infop->si_pid < 0)
  57                 return infop->si_pid;
  58         return 0;
  59 # endif
  60 }
  61
  62 #endif