libc/sysdeps/linux/common/ppoll.c

   1 /* Copyright (C) 2006 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3    Contributed by Ulrich Drepper <drepper@redhat.com>, 2006.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, see
  17    <http://www.gnu.org/licenses/>.  */
  18
  19 #include <sys/syscall.h>
  20
  21 #if (defined __NR_ppoll || defined(__NR_ppoll_time64)) && defined __UCLIBC_LINUX_SPECIFIC__ && defined __USE_GNU
  22
  23 #define __need_NULL
  24 #include <stddef.h>
  25 #include <signal.h>
  26 #include <sys/poll.h>
  27 #include <cancel.h>
  28
  29 static int
  30 __NC(ppoll)(struct pollfd *fds, nfds_t nfds, const struct timespec *timeout,
  31             const sigset_t *sigmask)
  32 {
  33         /* The Linux kernel can in some situations update the timeout value.
  34            We do not want that so use a local variable.  */
  35         struct timespec tval;
  36         if (timeout != NULL) {
  37                 tval = *timeout;
  38                 timeout = &tval;
  39         }
  40 #if defined(__UCLIBC_USE_TIME64__) && defined(__NR_ppoll_time64)
  41         return INLINE_SYSCALL(ppoll_time64, 5, fds, nfds, timeout, sigmask, __SYSCALL_SIGSET_T_SIZE);
  42 #else
  43         return INLINE_SYSCALL(ppoll, 5, fds, nfds, timeout, sigmask, __SYSCALL_SIGSET_T_SIZE);
  44 #endif
  45 }
  46
  47 CANCELLABLE_SYSCALL(int, ppoll, (struct pollfd *fds, nfds_t nfds, const struct timespec *timeout,
  48                                  const sigset_t *sigmask),
  49                     (fds, nfds, timeout, sigmask))
  50 #endif