1 /* Copyright (C) 2006-2014 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
3 Contributed by Ulrich Drepper <drepper@redhat.com>, 2006.
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.
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.
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/>. */
22 #include <stddef.h> /* For NULL. */
24 #include <sysdep-cancel.h>
28 ppoll (struct pollfd *fds, nfds_t nfds, const struct timespec *timeout,
29 const sigset_t *sigmask)
33 /* poll uses a simple millisecond value. Convert it. */
36 if (timeout->tv_sec < 0
37 || timeout->tv_nsec < 0 || timeout->tv_nsec >= 1000000000)
43 if (timeout->tv_sec > INT_MAX / 1000
44 || (timeout->tv_sec == INT_MAX / 1000
45 && ((timeout->tv_nsec + 999999) / 1000000 > INT_MAX % 1000)))
46 /* We cannot represent the timeout in an int value. Wait
50 tval = (timeout->tv_sec * 1000
51 + (timeout->tv_nsec + 999999) / 1000000);
54 /* The setting and restoring of the signal mask and the select call
55 should be an atomic operation. This can't be done without kernel
59 __sigprocmask (SIG_SETMASK, sigmask, &savemask);
61 /* Note the ppoll() is a cancellation point. But since we call
62 poll() which itself is a cancellation point we do not have
63 to do anything here. */
64 int retval = __poll (fds, nfds, tval);
67 __sigprocmask (SIG_SETMASK, &savemask, NULL);
73 /* __poll handles cancellation. */
74 LIBC_CANCEL_HANDLED ();
75 libc_hidden_def (ppoll);