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75 lines
2.2 KiB
C
75 lines
2.2 KiB
C
/* Copyright (C) 2006-2020 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Ulrich Drepper <drepper@redhat.com>, 2006.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <errno.h>
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#include <limits.h>
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#include <signal.h>
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#include <stddef.h> /* For NULL. */
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#include <sys/poll.h>
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#include <sysdep-cancel.h>
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#include <time.h>
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int
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ppoll (struct pollfd *fds, nfds_t nfds, const struct timespec *timeout,
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const sigset_t *sigmask)
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{
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int tval = -1;
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/* poll uses a simple millisecond value. Convert it. */
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if (timeout != NULL)
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{
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if (timeout->tv_sec < 0 || ! valid_nanoseconds (timeout->tv_nsec))
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{
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__set_errno (EINVAL);
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return -1;
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}
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if (timeout->tv_sec > INT_MAX / 1000
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|| (timeout->tv_sec == INT_MAX / 1000
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&& ((timeout->tv_nsec + 999999) / 1000000 > INT_MAX % 1000)))
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/* We cannot represent the timeout in an int value. Wait
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forever. */
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tval = -1;
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else
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tval = (timeout->tv_sec * 1000
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+ (timeout->tv_nsec + 999999) / 1000000);
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}
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/* The setting and restoring of the signal mask and the select call
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should be an atomic operation. This can't be done without kernel
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help. */
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sigset_t savemask;
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if (sigmask != NULL)
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__sigprocmask (SIG_SETMASK, sigmask, &savemask);
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/* Note the ppoll() is a cancellation point. But since we call
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poll() which itself is a cancellation point we do not have
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to do anything here. */
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int retval = __poll (fds, nfds, tval);
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if (sigmask != NULL)
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__sigprocmask (SIG_SETMASK, &savemask, NULL);
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return retval;
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}
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#ifndef ppoll
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libc_hidden_def (ppoll);
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#endif
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