mirror of
https://sourceware.org/git/glibc.git
synced 2024-10-01 03:27:48 +00:00
41bdb6e20c
2001-07-06 Paul Eggert <eggert@twinsun.com> * manual/argp.texi: Remove ignored LGPL copyright notice; it's not appropriate for documentation anyway. * manual/libc-texinfo.sh: "Library General Public License" -> "Lesser General Public License". 2001-07-06 Andreas Jaeger <aj@suse.de> * All files under GPL/LGPL version 2: Place under LGPL version 2.1.
76 lines
2.1 KiB
C
76 lines
2.1 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 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 <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
|