sysdeps/unix/sysv/linux/sigwaitinfo.c

   1 /* Copyright (C) 1997, 1998, 2000, 2002, 2003 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3
   4    The GNU C Library is free software; you can redistribute it and/or
   5    modify it under the terms of the GNU Lesser General Public
   6    License as published by the Free Software Foundation; either
   7    version 2.1 of the License, or (at your option) any later version.
   8
   9    The GNU C Library is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12    Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public
  15    License along with the GNU C Library; if not, write to the Free
  16    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  17    02111-1307 USA.  */
  18
  19 #include <errno.h>
  20 #include <signal.h>
  21 #define __need_NULL
  22 #include <stddef.h>
  23 #include <string.h>
  24
  25 #include <sysdep-cancel.h>
  26 #include <sys/syscall.h>
  27 #include <bp-checks.h>
  28
  29 #ifdef __NR_rt_sigtimedwait
  30
  31 static int
  32 do_sigwaitinfo (const sigset_t *set, siginfo_t *info)
  33 {
  34 #ifdef SIGCANCEL
  35   sigset_t tmpset;
  36   if (set != NULL && __sigismember (set, SIGCANCEL))
  37     {
  38       /* Create a temporary mask without the bit for SIGCANCEL set.  */
  39       // We are not copying more than we have to.
  40       memcpy (&tmpset, set, _NSIG / 8);
  41       __sigdelset (&tmpset, SIGCANCEL);
  42       set = &tmpset;
  43     }
  44 #endif
  45
  46   /* XXX The size argument hopefully will have to be changed to the
  47      real size of the user-level sigset_t.  */
  48   int result = INLINE_SYSCALL (rt_sigtimedwait, 4, CHECK_SIGSET (set),
  49                                CHECK_1 (info), NULL, _NSIG / 8);
  50
  51   /* The kernel generates a SI_TKILL code in si_code in case tkill is
  52      used.  tkill is transparently used in raise().  Since having
  53      SI_TKILL as a code is useful in general we fold the results
  54      here.  */
  55   if (result != -1 && info != NULL && info->si_code == SI_TKILL)
  56     info->si_code = SI_USER;
  57
  58   return result;
  59 }
  60
  61
  62 /* Return any pending signal or wait for one for the given time.  */
  63 int
  64 __sigwaitinfo (set, info)
  65      const sigset_t *set;
  66      siginfo_t *info;
  67 {
  68   if (SINGLE_THREAD_P)
  69     return do_sigwaitinfo (set, info);
  70
  71   int oldtype = LIBC_CANCEL_ASYNC ();
  72
  73   /* XXX The size argument hopefully will have to be changed to the
  74      real size of the user-level sigset_t.  */
  75   int result = do_sigwaitinfo (set, info);
  76
  77   LIBC_CANCEL_RESET (oldtype);
  78
  79   return result;
  80 }
  81 libc_hidden_def (__sigwaitinfo)
  82 weak_alias (__sigwaitinfo, sigwaitinfo)
  83 #else
  84 # include <sysdeps/generic/sigwaitinfo.c>
  85 #endif
  86 strong_alias (__sigwaitinfo, __libc_sigwaitinfo)