104 lines
2.9 KiB
C
104 lines
2.9 KiB
C
/*---------------------------------------------------------------------------*\
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$Id: poll.h,v 1.3 2002/05/11 11:32:30 bmc Exp $
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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 _POLL_EMUL_H_
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#define _POLL_EMUL_H_
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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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{
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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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typedef unsigned int nfds_t;
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#ifdef __cplusplus
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extern "C"
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{
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#endif
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#if (__STDC__ > 0) || defined(__cplusplus)
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extern int poll (struct pollfd *pArray, unsigned long n_fds, int timeout);
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#else
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extern int poll();
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#endif
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#ifdef __cplusplus
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}
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#endif
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#endif /* _POLL_EMUL_H_ */
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