sysdeps/unix/sysv/linux/ppoll.c

   1 /* Copyright (C) 2006-2024 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 <errno.h>
  19 #include <signal.h>
  20 #include <time.h>
  21 #include <sys/poll.h>
  22 #include <sysdep-cancel.h>
  23
  24 int
  25 __ppoll64 (struct pollfd *fds, nfds_t nfds, const struct __timespec64 *timeout,
  26            const sigset_t *sigmask)
  27 {
  28   /* The Linux kernel can in some situations update the timeout value.
  29      We do not want that so use a local variable.  */
  30   struct __timespec64 tval;
  31   if (timeout != NULL)
  32     {
  33       tval = *timeout;
  34       timeout = &tval;
  35     }
  36
  37 #ifndef __NR_ppoll_time64
  38 # define __NR_ppoll_time64 __NR_ppoll
  39 #endif
  40
  41 #ifdef __ASSUME_TIME64_SYSCALLS
  42   return SYSCALL_CANCEL (ppoll_time64, fds, nfds, timeout, sigmask,
  43                          __NSIG_BYTES);
  44 #else
  45   int ret;
  46   bool need_time64 = timeout != NULL && !in_int32_t_range (timeout->tv_sec);
  47   if (need_time64)
  48     {
  49       ret = SYSCALL_CANCEL (ppoll_time64, fds, nfds, timeout, sigmask,
  50                             __NSIG_BYTES);
  51       if (ret == 0 || errno != ENOSYS)
  52         return ret;
  53       __set_errno (EOVERFLOW);
  54       return -1;
  55     }
  56
  57   struct timespec ts32;
  58   if (timeout != NULL)
  59     ts32 = valid_timespec64_to_timespec (*timeout);
  60
  61   return SYSCALL_CANCEL (ppoll, fds, nfds, timeout ? &ts32 : NULL, sigmask,
  62                          __NSIG_BYTES);
  63 #endif
  64 }
  65
  66 #if __TIMESIZE != 64
  67 libc_hidden_def (__ppoll64)
  68
  69 int
  70 ppoll (struct pollfd *fds, nfds_t nfds, const struct timespec *timeout,
  71          const sigset_t *sigmask)
  72 {
  73   struct __timespec64 ts64;
  74   if (timeout)
  75     ts64 = valid_timespec_to_timespec64 (*timeout);
  76
  77   return __ppoll64 (fds, nfds, timeout ? &ts64 : NULL, sigmask);
  78 }
  79 #endif
  80 libc_hidden_def (ppoll)