/*---------------------------------------------------------------------------*\ $Id$ 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_ */