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/* Poll system call, with emulation if it is not available.
Copyright (C) 1997,1998,1999,2000,2001,2002,2006
Free Software Foundation, Inc.
This file is part of the GNU C Library.
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, see
<http://www.gnu.org/licenses/>. */
#include <errno.h>
#include <sys/poll.h>
#include <sysdep-cancel.h>
#include <sys/syscall.h>
#include <bp-checks.h>
#include <kernel-features.h>
#if defined __NR_poll || __ASSUME_POLL_SYSCALL > 0
# if __ASSUME_POLL_SYSCALL == 0
static int __emulate_poll (struct pollfd *fds, nfds_t nfds,
int timeout) internal_function;
# endif
# if __ASSUME_POLL_SYSCALL == 0
/* For loser kernels. */
static int
loser_poll (struct pollfd *fds, nfds_t nfds, int timeout)
{
static int must_emulate;
if (!must_emulate)
{
int errno_saved = errno;
int retval = INLINE_SYSCALL (poll, 3, CHECK_N (fds, nfds), nfds,
timeout);
if (retval >= 0 || errno != ENOSYS)
return retval;
__set_errno (errno_saved);
must_emulate = 1;
}
return __emulate_poll (fds, nfds, timeout);
}
# endif
/* The real implementation. */
int
__poll (fds, nfds, timeout)
struct pollfd *fds;
nfds_t nfds;
int timeout;
{
# if __ASSUME_POLL_SYSCALL == 0
if (SINGLE_THREAD_P)
return loser_poll (CHECK_N (fds, nfds), nfds, timeout);
int oldtype = LIBC_CANCEL_ASYNC ();
int result = loser_poll (CHECK_N (fds, nfds), nfds, timeout);
LIBC_CANCEL_RESET (oldtype);
return result;
# else
if (SINGLE_THREAD_P)
return INLINE_SYSCALL (poll, 3, CHECK_N (fds, nfds), nfds, timeout);
int oldtype = LIBC_CANCEL_ASYNC ();
int result = INLINE_SYSCALL (poll, 3, CHECK_N (fds, nfds), nfds, timeout);
LIBC_CANCEL_RESET (oldtype);
return result;
# endif
}
libc_hidden_def (__poll)
weak_alias (__poll, poll)
strong_alias (__poll, __libc_poll)
/* Get the emulation code. */
# define __poll(fds, nfds, timeout) \
static internal_function __emulate_poll (fds, nfds, timeout)
#endif
#if __ASSUME_POLL_SYSCALL == 0
# include <sysdeps/unix/bsd/poll.c>
#endif
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