89 lines
3.0 KiB
C
89 lines
3.0 KiB
C
/* `fd_set' type and related macros, and `select'/`pselect' declarations.
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Copyright (C) 1996, 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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/* POSIX 1003.1g: 6.2 Select from File Descriptor Sets <sys/select.h> */
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#ifndef _SYS_SELECT_H
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#define _SYS_SELECT_H 1
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#include <features.h>
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/* Get definition of needed basic types. */
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#include <bits/types.h>
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/* Get __FD_* definitions. */
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#include <bits/select.h>
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/* Get definition of timer specification structures. */
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#define __need_timespec
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#include <time.h>
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__BEGIN_DECLS
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/* This declaration puts `struct timeval' in global scope even if
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<sys/time.h> has not been included to define it. That way the
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`select' prototype below will not conflict with a later definition
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of `struct timeval'. */
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struct timeval;
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typedef __fd_mask fd_mask;
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/* Representation of a set of file descriptors. */
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typedef __fd_set fd_set;
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/* Maximum number of file descriptors in `fd_set'. */
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#define FD_SETSIZE __FD_SETSIZE
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#ifdef __USE_MISC
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/* Number of bits per word of `fd_set' (some code assumes this is 32). */
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# define NFDBITS __NFDBITS
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#endif
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/* Access macros for `fd_set'. */
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#define FD_SET(fd, fdsetp) __FD_SET ((fd), (fdsetp))
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#define FD_CLR(fd, fdsetp) __FD_CLR ((fd), (fdsetp))
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#define FD_ISSET(fd, fdsetp) __FD_ISSET ((fd), (fdsetp))
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#define FD_ZERO(fdsetp) __FD_ZERO (fdsetp)
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/* Check the first NFDS descriptors each in READFDS (if not NULL) for read
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readiness, in WRITEFDS (if not NULL) for write readiness, and in EXCEPTFDS
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(if not NULL) for exceptional conditions. If TIMEOUT is not NULL, time out
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after waiting the interval specified therein. Returns the number of ready
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descriptors, or -1 for errors. */
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extern int __select __P ((int __nfds, __fd_set *__readfds,
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__fd_set *__writefds, __fd_set *__exceptfds,
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struct timeval *__timeout));
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extern int select __P ((int __nfds, __fd_set *__readfds,
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__fd_set *__writefds, __fd_set *__exceptfds,
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struct timeval *__timeout));
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#ifdef __USE_POSIX
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/* Same as above only that the TIMEOUT value is given with higher
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resolution. This version should be used. */
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extern int pselect __P ((int __nfds, __fd_set *__readfds,
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__fd_set *__writefds, __fd_set *__exceptfds,
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struct timespec *__timeout));
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#endif
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__END_DECLS
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#endif /* sys/select.h */
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