mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-20 12:00:06 +00:00
90 lines
3.2 KiB
C
90 lines
3.2 KiB
C
/* `fd_set' type and related macros, and `select'/`pselect' declarations.
|
|
Copyright (C) 1996, 1997 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. */
|
|
|
|
/* POSIX 1003.1g: 6.2 Select from File Descriptor Sets <sys/select.h> */
|
|
|
|
#ifndef _SYS_SELECT_H
|
|
|
|
#define _SYS_SELECT_H 1
|
|
#include <features.h>
|
|
|
|
/* Get definition of needed basic types. */
|
|
#include <gnu/types.h>
|
|
|
|
/* Get __FD_* definitions. */
|
|
#include <selectbits.h>
|
|
|
|
/* Get definition of timer specification structures. */
|
|
#define __need_timespec
|
|
#include <time.h>
|
|
|
|
__BEGIN_DECLS
|
|
|
|
/* This declaration puts `struct timeval' in global scope even if
|
|
<sys/time.h> has not been included to define it. That way the
|
|
`select' prototype below will not conflict with a later definition
|
|
of `struct timeval'. */
|
|
struct timeval;
|
|
|
|
typedef __fd_mask fd_mask;
|
|
|
|
/* Representation of a set of file descriptors. */
|
|
typedef __fd_set fd_set;
|
|
|
|
/* Maximum number of file descriptors in `fd_set'. */
|
|
#define FD_SETSIZE __FD_SETSIZE
|
|
|
|
#ifdef __USE_MISC
|
|
/* Number of bits per word of `fd_set' (some code assumes this is 32). */
|
|
#define NFDBITS __NFDBITS
|
|
#endif
|
|
|
|
|
|
/* Access macros for `fd_set'. */
|
|
#define FD_SET(fd, fdsetp) __FD_SET ((fd), (fdsetp))
|
|
#define FD_CLR(fd, fdsetp) __FD_CLR ((fd), (fdsetp))
|
|
#define FD_ISSET(fd, fdsetp) __FD_ISSET ((fd), (fdsetp))
|
|
#define FD_ZERO(fdsetp) __FD_ZERO (fdsetp)
|
|
|
|
|
|
/* Check the first NFDS descriptors each in READFDS (if not NULL) for read
|
|
readiness, in WRITEFDS (if not NULL) for write readiness, and in EXCEPTFDS
|
|
(if not NULL) for exceptional conditions. If TIMEOUT is not NULL, time out
|
|
after waiting the interval specified therein. Returns the number of ready
|
|
descriptors, or -1 for errors. */
|
|
extern int __select __P ((int __nfds, __fd_set *__readfds,
|
|
__fd_set *__writefds, __fd_set *__exceptfds,
|
|
struct timeval *__timeout));
|
|
extern int select __P ((int __nfds, __fd_set *__readfds,
|
|
__fd_set *__writefds, __fd_set *__exceptfds,
|
|
struct timeval *__timeout));
|
|
|
|
/* Same as above only that the TIMEOUT value is given with higher
|
|
resolution. This version should be used. */
|
|
extern int __pselect __P ((int __nfds, __fd_set *__readfds,
|
|
__fd_set *__writefds, __fd_set *__exceptfds,
|
|
struct timespec *__timeout));
|
|
extern int pselect __P ((int __nfds, __fd_set *__readfds,
|
|
__fd_set *__writefds, __fd_set *__exceptfds,
|
|
struct timespec *__timeout));
|
|
|
|
__END_DECLS
|
|
|
|
#endif /* sys/select.h */
|