mirror of
https://github.com/sheumann/hush.git
synced 2024-11-18 17:10:36 +00:00
488a238ad7
This is a BSD-licensed poll() implementation by Brian M. Clapper. Its performance characteristics aren't as good as a "native" poll() would be, but this shouldn't be a problem in practice.
106 lines
3.2 KiB
C
106 lines
3.2 KiB
C
/*---------------------------------------------------------------------------*\
|
|
$Id$
|
|
|
|
NAME
|
|
|
|
poll - select(2)-based poll() emulation function for BSD systems.
|
|
|
|
SYNOPSIS
|
|
#include "poll.h"
|
|
|
|
struct pollfd
|
|
{
|
|
int fd;
|
|
short events;
|
|
short revents;
|
|
}
|
|
|
|
int poll (struct pollfd *pArray, unsigned long n_fds, int timeout)
|
|
|
|
DESCRIPTION
|
|
|
|
This file, and the accompanying "poll.c", implement the System V
|
|
poll(2) system call for BSD systems (which typically do not provide
|
|
poll()). Poll() provides a method for multiplexing input and output
|
|
on multiple open file descriptors; in traditional BSD systems, that
|
|
capability is provided by select(). While the semantics of select()
|
|
differ from those of poll(), poll() can be readily emulated in terms
|
|
of select() -- which is how this function is implemented.
|
|
|
|
REFERENCES
|
|
Stevens, W. Richard. Unix Network Programming. Prentice-Hall, 1990.
|
|
|
|
NOTES
|
|
1. This software requires an ANSI C compiler.
|
|
|
|
LICENSE
|
|
|
|
This software is released under the following BSD license, adapted from
|
|
http://opensource.org/licenses/bsd-license.php
|
|
|
|
Copyright (c) 1995-2011, Brian M. Clapper
|
|
All rights reserved.
|
|
|
|
Redistribution and use in source and binary forms, with or without
|
|
modification, are permitted provided that the following conditions are met:
|
|
|
|
* Redistributions of source code must retain the above copyright notice,
|
|
this list of conditions and the following disclaimer.
|
|
|
|
* Redistributions in binary form must reproduce the above copyright
|
|
notice, this list of conditions and the following disclaimer in the
|
|
documentation and/or other materials provided with the distribution.
|
|
|
|
* Neither the name of the clapper.org nor the names of its contributors
|
|
may be used to endorse or promote products derived from this software
|
|
without specific prior written permission.
|
|
|
|
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
|
|
IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
|
|
THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
|
|
PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
|
|
CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
|
|
EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
|
|
PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
|
|
PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
|
|
LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
|
|
NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
|
|
SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|
\*---------------------------------------------------------------------------*/
|
|
|
|
#ifndef _POLL_EMUL_H_
|
|
#define _POLL_EMUL_H_
|
|
|
|
#define POLLIN 0x01
|
|
#define POLLPRI 0x02
|
|
#define POLLOUT 0x04
|
|
#define POLLERR 0x08
|
|
#define POLLHUP 0x10
|
|
#define POLLNVAL 0x20
|
|
|
|
struct pollfd
|
|
{
|
|
int fd;
|
|
short events;
|
|
short revents;
|
|
};
|
|
|
|
typedef unsigned long nfds_t;
|
|
|
|
#ifdef __cplusplus
|
|
extern "C"
|
|
{
|
|
#endif
|
|
|
|
#if (__STDC__ > 0) || defined(__cplusplus)
|
|
extern int poll (struct pollfd *pArray, nfds_t n_fds, int timeout);
|
|
#else
|
|
extern int poll();
|
|
#endif
|
|
|
|
#ifdef __cplusplus
|
|
}
|
|
#endif
|
|
|
|
#endif /* _POLL_EMUL_H_ */
|