sysdeps/unix/sysv/linux/sigtimedwait.c

   1 /* Copyright (C) 1997-2024 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, see
  16    <https://www.gnu.org/licenses/>.  */
  17
  18 #include <signal.h>
  19 #include <sysdep.h>
  20
  21 int
  22 __sigtimedwait64 (const sigset_t *set, siginfo_t *info,
  23                   const struct __timespec64 *timeout)
  24 {
  25 #ifndef __NR_rt_sigtimedwait_time64
  26 # define __NR_rt_sigtimedwait_time64 __NR_rt_sigtimedwait
  27 #endif
  28
  29   int result;
  30 #ifdef __ASSUME_TIME64_SYSCALLS
  31   result = SYSCALL_CANCEL (rt_sigtimedwait_time64, set, info, timeout,
  32                            __NSIG_BYTES);
  33 #else
  34   bool need_time64 = timeout != NULL && !in_int32_t_range (timeout->tv_sec);
  35   if (need_time64)
  36     {
  37       result = SYSCALL_CANCEL (rt_sigtimedwait_time64, set, info, timeout,
  38                                __NSIG_BYTES);
  39       if (result == 0 || errno != ENOSYS)
  40         return result;
  41       __set_errno (EOVERFLOW);
  42       return -1;
  43     }
  44   else
  45     {
  46       struct timespec ts32, *pts32 = NULL;
  47       if (timeout != NULL)
  48         {
  49           ts32 = valid_timespec64_to_timespec (*timeout);
  50           pts32 = &ts32;
  51         }
  52       result = SYSCALL_CANCEL (rt_sigtimedwait, set, info, pts32,
  53                                __NSIG_BYTES);
  54     }
  55 #endif
  56
  57   /* The kernel generates a SI_TKILL code in si_code in case tkill is
  58      used.  tkill is transparently used in raise().  Since having
  59      SI_TKILL as a code is useful in general we fold the results
  60      here.  */
  61   if (result != -1 && info != NULL && info->si_code == SI_TKILL)
  62     info->si_code = SI_USER;
  63
  64   return result;
  65 }
  66 #if __TIMESIZE != 64
  67 libc_hidden_def (__sigtimedwait64)
  68
  69 int
  70 __sigtimedwait (const sigset_t *set, siginfo_t *info,
  71                 const struct timespec *timeout)
  72 {
  73   struct __timespec64 ts64, *pts64 = NULL;
  74   if (timeout != NULL)
  75     {
  76       ts64 = valid_timespec_to_timespec64 (*timeout);
  77       pts64 = &ts64;
  78     }
  79   return __sigtimedwait64 (set, info, pts64);
  80 }
  81 #endif
  82 libc_hidden_def (__sigtimedwait)
  83 weak_alias (__sigtimedwait, sigtimedwait)