sysdeps/unix/sysv/linux/epoll_pwait.c

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