glibc/sysdeps/unix/sysv/linux/poll.c
Ulrich Drepper 3eee130454 Update.
* io/sys/poll.h: Define nfds_t and use it in poll prototype.
	* sysdeps/generic/poll.c: Use nfds_t type in function definition.
	* sysdeps/mach/hurd/poll.c: Likewise.
	* sysdeps/unix/bsd/poll.c: Likewise.
	* sysdeps/unix/sysv/linux/poll.c: Likewise.
	* sysdeps/unix/sysv/aix/poll.c: Likewise.
	* sysdeps/generic/bits/poll.h: Define NPOLLFILE only if __USE_MISC.
	* sysdeps/unix/sysv/linux/bits/poll.h: Likewise.
	* sysdeps/unix/sysv/linux/m68k/bits/poll.h: Likewise.
	* sysdeps/unix/sysv/linux/mips/bits/poll.h: Likewise.
	* sysdeps/unix/sysv/linux/sparc/bits/poll.h: Likewise.
	* conform/data/poll.h-data: Fix typo in poll prototype.
2001-01-27 05:01:26 +00:00

76 lines
2.2 KiB
C

/* Poll system call, with emulation if it is not available.
Copyright (C) 1997, 1998, 1999, 2000, 2001 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 Library General Public License as
published by the Free Software Foundation; either version 2 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
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with the GNU C Library; see the file COPYING.LIB. If not,
write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA. */
#include <errno.h>
#include <sys/poll.h>
#include <sysdep.h>
#include <sys/syscall.h>
#include <bp-checks.h>
#include "kernel-features.h"
#if defined __NR_poll || __ASSUME_POLL_SYSCALL > 0
extern int __syscall_poll (struct pollfd *__unbounded fds,
unsigned int nfds, int timeout);
# if __ASSUME_POLL_SYSCALL == 0
static int __emulate_poll (struct pollfd *fds, nfds_t nfds,
int timeout) internal_function;
# endif
/* The real implementation. */
int
__poll (fds, nfds, timeout)
struct pollfd *fds;
nfds_t nfds;
int timeout;
{
# if __ASSUME_POLL_SYSCALL == 0
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);
# else
return INLINE_SYSCALL (poll, 3, CHECK_N (fds, nfds), nfds, timeout);
# endif
}
weak_alias (__poll, 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