Pull in third-party poll emulator and automatically link it in if we detect the system's poll is broken

2012-04-20 04:59:09 -04:00
parent 8de74afb5f
commit dd49b986ed
7 changed files with 515 additions and 3 deletions
@@ -0,0 +1,105 @@
+/*---------------------------------------------------------------------------*\
+  $Id$
+
+  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_ */