1 /* Poll system call, with emulation if it is not available.
2 Copyright (C) 1997, 1998 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Library General Public License as
7 published by the Free Software Foundation; either version 2 of the
8 License, or (at your option) any later version.
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Library General Public License for more details.
15 You should have received a copy of the GNU Library General Public
16 License along with the GNU C Library; see the file COPYING.LIB. If not,
17 write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
18 Boston, MA 02111-1307, USA. */
23 #include <sys/syscall.h>
26 extern int __syscall_poll __P ((struct pollfd *fds, unsigned int nfds,
28 weak_extern (__syscall_poll)
30 static int __emulate_poll __P ((struct pollfd *fds, unsigned long int nfds,
31 int timeout)) internal_function;
33 /* The real implementation. */
35 poll (fds, nfds, timeout)
37 unsigned long int nfds;
40 static int must_emulate = 0;
41 int (*syscall) __P ((struct pollfd *, unsigned int, int)) = __syscall_poll;
47 int errno_saved = errno;
48 int retval = __syscall_poll (fds, nfds, timeout);
50 if (retval >= 0 || errno != ENOSYS)
53 __set_errno (errno_saved);
59 return __emulate_poll (fds, nfds, timeout);
63 /* Get the emulation code. */
64 # define poll(fds, nfds, timeout) \
65 static internal_function __emulate_poll (fds, nfds, timeout)
67 #include <sysdeps/unix/bsd/poll.c>