mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-19 03:20:05 +00:00
68 lines
2.0 KiB
C
68 lines
2.0 KiB
C
/* Poll system call, with emulation if it is not available.
|
|
Copyright (C) 1997, 1998 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 <sys/syscall.h>
|
|
#ifdef __NR_poll
|
|
|
|
extern int __syscall_poll __P ((struct pollfd *fds, unsigned int nfds,
|
|
int timeout));
|
|
weak_extern (__syscall_poll)
|
|
|
|
static int __emulate_poll __P ((struct pollfd *fds, unsigned long int nfds,
|
|
int timeout)) internal_function;
|
|
|
|
/* The real implementation. */
|
|
int
|
|
__poll (fds, nfds, timeout)
|
|
struct pollfd *fds;
|
|
unsigned long int nfds;
|
|
int timeout;
|
|
{
|
|
static int must_emulate = 0;
|
|
int (*syscall) __P ((struct pollfd *, unsigned int, int)) = __syscall_poll;
|
|
|
|
if (!must_emulate)
|
|
{
|
|
if (syscall)
|
|
{
|
|
int errno_saved = errno;
|
|
int retval = __syscall_poll (fds, nfds, timeout);
|
|
|
|
if (retval >= 0 || errno != ENOSYS)
|
|
return retval;
|
|
|
|
__set_errno (errno_saved);
|
|
}
|
|
|
|
must_emulate = 1;
|
|
}
|
|
|
|
return __emulate_poll (fds, nfds, timeout);
|
|
}
|
|
weak_alias (__poll, poll)
|
|
|
|
/* Get the emulation code. */
|
|
# define __poll(fds, nfds, timeout) \
|
|
static internal_function __emulate_poll (fds, nfds, timeout)
|
|
#endif
|
|
#include <sysdeps/unix/bsd/poll.c>
|