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68 lines
2.0 KiB
C
68 lines
2.0 KiB
C
/* Poll system call, with emulation if it is not available.
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Copyright (C) 1997, 1998 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 Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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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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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If not,
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write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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#include <errno.h>
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#include <sys/poll.h>
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#include <sys/syscall.h>
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#ifdef __NR_poll
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extern int __syscall_poll __P ((struct pollfd *fds, unsigned int nfds,
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int timeout));
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weak_extern (__syscall_poll)
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static int __emulate_poll __P ((struct pollfd *fds, unsigned long int nfds,
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int timeout)) internal_function;
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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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unsigned long int nfds;
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int timeout;
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{
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static int must_emulate = 0;
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int (*syscall) __P ((struct pollfd *, unsigned int, int)) = __syscall_poll;
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if (!must_emulate)
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{
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if (syscall)
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{
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int errno_saved = errno;
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int retval = __syscall_poll (fds, 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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}
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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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}
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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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#include <sysdeps/unix/bsd/poll.c>
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