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authorJakub Jelinek <jakub@redhat.com>2007-07-12 18:26:36 +0000
committerJakub Jelinek <jakub@redhat.com>2007-07-12 18:26:36 +0000
commit0ecb606cb6cf65de1d9fc8a919bceb4be476c602 (patch)
tree2ea1f8305970753e4a657acb2ccc15ca3eec8e2c /io/ppoll.c
parent7d58530341304d403a6626d7f7a1913165fe2f32 (diff)
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2.5-18.1
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-rw-r--r--io/ppoll.c76
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diff --git a/io/ppoll.c b/io/ppoll.c
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+/* Copyright (C) 2006 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+ Contributed by Ulrich Drepper <drepper@redhat.com>, 2006.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; if not, write to the Free
+ Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+ 02111-1307 USA. */
+
+#include <errno.h>
+#include <limits.h>
+#include <signal.h>
+#include <stddef.h> /* For NULL. */
+#include <sys/poll.h>
+#include <sysdep-cancel.h>
+
+
+int
+ppoll (struct pollfd *fds, nfds_t nfds, const struct timespec *timeout,
+ const sigset_t *sigmask)
+{
+ int tval = -1;
+
+ /* poll uses a simple millisecond value. Convert it. */
+ if (timeout != NULL)
+ {
+ if (timeout->tv_sec < 0
+ || timeout->tv_nsec < 0 || timeout->tv_nsec >= 1000000000)
+ {
+ __set_errno (EINVAL);
+ return -1;
+ }
+
+ if (timeout->tv_sec > INT_MAX / 1000
+ || (timeout->tv_sec == INT_MAX / 1000
+ && ((timeout->tv_nsec + 999999) / 1000000 > INT_MAX % 1000)))
+ /* We cannot represent the timeout in an int value. Wait
+ forever. */
+ tval = -1;
+ else
+ tval = (timeout->tv_sec * 1000
+ + (timeout->tv_nsec + 999999) / 1000000);
+ }
+
+ /* The setting and restoring of the signal mask and the select call
+ should be an atomic operation. This can't be done without kernel
+ help. */
+ sigset_t savemask;
+ if (sigmask != NULL)
+ __sigprocmask (SIG_SETMASK, sigmask, &savemask);
+
+ /* Note the ppoll() is a cancellation point. But since we call
+ poll() which itself is a cancellation point we do not have
+ to do anything here. */
+ int retval = __poll (fds, nfds, tval);
+
+ if (sigmask != NULL)
+ __sigprocmask (SIG_SETMASK, &savemask, NULL);
+
+ return retval;
+}
+
+#ifndef ppoll
+/* __poll handles cancellation. */
+LIBC_CANCEL_HANDLED ();
+#endif