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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.
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Copyright (C) 1997, 1998, 1999, 2000, 2001 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, write to the Free
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA. */
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#include <errno.h>
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#include <sys/poll.h>
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#include <sysdep.h>
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#include <sys/syscall.h>
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#include <bp-checks.h>
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#include "kernel-features.h"
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#if defined __NR_poll || __ASSUME_POLL_SYSCALL > 0
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extern int __syscall_poll (struct pollfd *__unbounded fds,
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unsigned int nfds, int timeout);
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# if __ASSUME_POLL_SYSCALL == 0
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static int __emulate_poll (struct pollfd *fds, nfds_t nfds,
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int timeout) internal_function;
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# endif
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/* The real implementation. */
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int
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__poll (fds, nfds, timeout)
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struct pollfd *fds;
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nfds_t nfds;
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int timeout;
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{
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# if __ASSUME_POLL_SYSCALL == 0
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static int must_emulate;
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if (!must_emulate)
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{
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int errno_saved = errno;
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int retval = INLINE_SYSCALL (poll, 3, CHECK_N (fds, nfds), nfds, timeout);
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if (retval >= 0 || errno != ENOSYS)
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return retval;
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__set_errno (errno_saved);
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must_emulate = 1;
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}
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return __emulate_poll (fds, nfds, timeout);
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# else
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return INLINE_SYSCALL (poll, 3, CHECK_N (fds, nfds), nfds, timeout);
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# endif
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}
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weak_alias (__poll, poll)
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/* Get the emulation code. */
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# define __poll(fds, nfds, timeout) \
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static internal_function __emulate_poll (fds, nfds, timeout)
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#endif
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#if __ASSUME_POLL_SYSCALL == 0
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# include <sysdeps/unix/bsd/poll.c>
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#endif
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