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https://origsvn.digium.com/svn/asterisk/branches/1.8 ................ r284597 | tilghman | 2010-09-02 00:00:34 -0500 (Thu, 02 Sep 2010) | 29 lines Merged revisions 284593,284595 via svnmerge from https://origsvn.digium.com/svn/asterisk/branches/1.6.2 ................ r284593 | tilghman | 2010-09-01 17:59:50 -0500 (Wed, 01 Sep 2010) | 18 lines Merged revisions 284478 via svnmerge from https://origsvn.digium.com/svn/asterisk/branches/1.4 ........ r284478 | tilghman | 2010-09-01 13:49:11 -0500 (Wed, 01 Sep 2010) | 11 lines Ensure that all areas that previously used select(2) now use poll(2), with implementations that need poll(2) implemented with select(2) safe against 1024-bit overflows. This is a followup to the fix for the pthread timer in 1.6.2 and beyond, fixing a potential crash bug in all supported releases. (closes issue #17678) Reported by: russell Branch: https://origsvn.digium.com/svn/asterisk/team/tilghman/ast_select Review: https://reviewboard.asterisk.org/r/824/ ........ ................ r284595 | tilghman | 2010-09-01 22:57:43 -0500 (Wed, 01 Sep 2010) | 2 lines Failed to rerun bootstrap.sh after last commit ................ ................ git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@284598 65c4cc65-6c06-0410-ace0-fbb531ad65f3
140 lines
3.8 KiB
C
140 lines
3.8 KiB
C
/*
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* Asterisk -- An open source telephony toolkit.
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*
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* See http://www.asterisk.org for more information about
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* the Asterisk project. Please do not directly contact
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* any of the maintainers of this project for assistance;
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* the project provides a web site, mailing lists and IRC
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* channels for your use.
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*/
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/*---------------------------------------------------------------------------*\
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$Id$
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NAME
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poll - select(2)-based poll() emulation function for BSD systems.
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SYNOPSIS
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#include "poll.h"
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struct pollfd
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{
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int fd;
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short events;
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short revents;
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}
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int poll (struct pollfd *pArray, unsigned long n_fds, int timeout)
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DESCRIPTION
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This file, and the accompanying "poll.c", implement the System V
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poll(2) system call for BSD systems (which typically do not provide
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poll()). Poll() provides a method for multiplexing input and output
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on multiple open file descriptors; in traditional BSD systems, that
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capability is provided by select(). While the semantics of select()
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differ from those of poll(), poll() can be readily emulated in terms
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of select() -- which is how this function is implemented.
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REFERENCES
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Stevens, W. Richard. Unix Network Programming. Prentice-Hall, 1990.
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NOTES
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1. This software requires an ANSI C compiler.
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LICENSE
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This software is released under the following license:
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Copyright (c) 1995-2002 Brian M. Clapper
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All rights reserved.
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Redistribution and use in source and binary forms are
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permitted provided that: (1) source distributions retain
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this entire copyright notice and comment; (2) modifications
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made to the software are prominently mentioned, and a copy
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of the original software (or a pointer to its location) are
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included; and (3) distributions including binaries display
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the following acknowledgement: "This product includes
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software developed by Brian M. Clapper <bmc@clapper.org>"
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in the documentation or other materials provided with the
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distribution. The name of the author may not be used to
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endorse or promote products derived from this software
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without specific prior written permission.
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THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS
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OR IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE
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IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
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PARTICULAR PURPOSE.
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Effectively, this means you can do what you want with the software
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except remove this notice or take advantage of the author's name.
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If you modify the software and redistribute your modified version,
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you must indicate that your version is a modification of the
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original, and you must provide either a pointer to or a copy of the
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original.
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\*---------------------------------------------------------------------------*/
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#ifndef __AST_POLL_COMPAT_H
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#define __AST_POLL_COMPAT_H
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#include "asterisk/select.h"
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#ifndef AST_POLL_COMPAT
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#include <sys/poll.h>
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#define ast_poll(a, b, c) poll(a, b, c)
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#else /* AST_POLL_COMPAT */
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#define POLLIN 0x01
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#define POLLPRI 0x02
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#define POLLOUT 0x04
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#define POLLERR 0x08
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#define POLLHUP 0x10
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#define POLLNVAL 0x20
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struct pollfd {
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int fd;
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short events;
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short revents;
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};
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#ifdef __cplusplus
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extern "C" {
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#endif
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#define ast_poll(a, b, c) ast_internal_poll(a, b, c)
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int ast_internal_poll(struct pollfd *pArray, unsigned long n_fds, int timeout);
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#ifdef __cplusplus
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}
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#endif
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#endif /* AST_POLL_COMPAT */
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/*!
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* \brief Same as poll(2), except the time is specified in microseconds and
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* the tv argument is modified to indicate the time remaining.
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*/
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int ast_poll2(struct pollfd *pArray, unsigned long n_fds, struct timeval *tv);
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/*!
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* \brief Shortcut for conversion of FD_ISSET to poll(2)-based
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*/
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static inline int ast_poll_fd_index(struct pollfd *haystack, int nfds, int needle)
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{
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int i;
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for (i = 0; i < nfds; i++) {
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if (haystack[i].fd == needle) {
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return i;
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}
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}
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return -1;
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}
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#endif /* __AST_POLL_COMPAT_H */
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