mirror of
git://sourceware.org/git/glibc.git
synced 2024-12-27 04:41:02 +08:00
958f238f36
1999-05-26 Ulrich Drepper <drepper@cygnus.com> * config.h.in: Add __LINUX_KERNEL_VERSION. * configure.in: Recognize --enable-kernel. * sysdeps/unix/sysv/linux/configure.in: Check for correct kernel headers if --enable-kernel is given and set __LINUX_KERNEL_VERSION appropriately. * sysdeps/unix/sysv/linux/init-first.c: If minimal kernel version is given perform runtime test. * sysdeps/unix/sysv/linux/kernel-features.h: New file. * sysdeps/unix/sysv/linux/getcwd.c: Elide compatibility code if minimal supported kernel is known to have the feature. * sysdeps/unix/sysv/linux/poll.c: Likewise. * sysdeps/unix/sysv/linux/pread.c: Likewise. * sysdeps/unix/sysv/linux/pread64.c: Likewise. * sysdeps/unix/sysv/linux/pwrite.c: Likewise. * sysdeps/unix/sysv/linux/pwrite64.c: Likewise. * sysdeps/unix/sysv/linux/seteuid.c: Likewise. * sysdeps/unix/sysv/linux/sigaction.c: Likewise. * sysdeps/unix/sysv/linux/sigprocmask.c: Likewise. * sysdeps/unix/sysv/linux/sigsuspend.c: Likewise. * sysdeps/unix/sysv/linux/testrtsig.h: Likewise. * sysdeps/unix/sysv/linux/i386/chown.c: Likewise. * sysdeps/unix/sysv/linux/i386/pread.c: Likewise. * sysdeps/unix/sysv/linux/i386/pread64.c: Likewise. * sysdeps/unix/sysv/linux/i386/pwrite.c: Likewise. * sysdeps/unix/sysv/linux/i386/pwrite64.c: Likewise. * sysdeps/unix/sysv/linux/sysctl.c: Add __sysctl alias.
75 lines
2.1 KiB
C
75 lines
2.1 KiB
C
/* Poll system call, with emulation if it is not available.
|
|
Copyright (C) 1997, 1998, 1999 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 "kernel-features.h"
|
|
|
|
#if defined __NR_poll || __ASSUME_POLL_SYSCALL > 0
|
|
|
|
extern int __syscall_poll __P ((struct pollfd *fds, unsigned int nfds,
|
|
int timeout));
|
|
|
|
# if __ASSUME_POLL_SYSCALL == 0
|
|
static int __emulate_poll __P ((struct pollfd *fds, unsigned long int nfds,
|
|
int timeout)) internal_function;
|
|
# endif
|
|
|
|
/* The real implementation. */
|
|
int
|
|
__poll (fds, nfds, timeout)
|
|
struct pollfd *fds;
|
|
unsigned long int 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, fds, 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, fds, 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
|