sysdeps/unix/sysv/linux/epoll_pwait.c

   1 /* Copyright (C) 2007-2015 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    <http://www.gnu.org/licenses/>.  */
  17
  18 #include <errno.h>
  19 #include <signal.h>
  20 #include <unistd.h>
  21 #include <sys/epoll.h>
  22
  23 #include <sysdep-cancel.h>
  24 #include <sys/syscall.h>
  25
  26 #ifdef __NR_epoll_pwait
  27
  28 /* Wait for events on an epoll instance "epfd". Returns the number of
  29    triggered events returned in "events" buffer. Or -1 in case of
  30    error with the "errno" variable set to the specific error code. The
  31    "events" parameter is a buffer that will contain triggered
  32    events. The "maxevents" is the maximum number of events to be
  33    returned ( usually size of "events" ). The "timeout" parameter
  34    specifies the maximum wait time in milliseconds (-1 == infinite).
  35    The thread's signal mask is temporarily and atomically replaced with
  36    the one provided as parameter.  */
  37
  38 int epoll_pwait (int epfd, struct epoll_event *events,
  39                  int maxevents, int timeout,
  40                  const sigset_t *set)
  41 {
  42   if (SINGLE_THREAD_P)
  43     return INLINE_SYSCALL (epoll_pwait, 6, epfd, events, maxevents, timeout,
  44                            set, _NSIG / 8);
  45
  46   int oldtype = LIBC_CANCEL_ASYNC ();
  47
  48   int result = INLINE_SYSCALL (epoll_pwait, 6, epfd, events, maxevents,
  49                                timeout, set, _NSIG / 8);
  50
  51   LIBC_CANCEL_RESET (oldtype);
  52
  53   return result;
  54 }
  55
  56 #else
  57
  58 int epoll_pwait (int epfd, struct epoll_event *events,
  59                  int maxevents, int timeout,
  60                  const sigset_t *set)
  61 {
  62   __set_errno (ENOSYS);
  63   return -1;
  64 }
  65 stub_warning (epoll_pwait)
  66
  67 #endif
  68
  69 libc_hidden_def (epoll_pwait)