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/cvs/gvpe/lib/poll.h
Revision: 1.3
Committed: Sat Jan 17 01:18:36 2004 UTC (20 years, 10 months ago) by pcg
Content type: text/plain
Branch: MAIN
CVS Tags: HEAD
Changes since 1.2: +1 -1 lines
State: FILE REMOVED
Log Message:
*** empty log message ***

File Contents

# Content
1 #if defined(HAVE_SYS_POLL_H) && defined(HAVE_POLL)
2 # include <sys/poll.h>
3 #else
4
5
6 /*---------------------------------------------------------------------------*\
7 $Id: poll.h,v 1.2 2003/10/14 19:14:28 pcg Exp $
8
9 NAME
10
11 poll - select(2)-based poll() emulation function for BSD systems.
12
13 SYNOPSIS
14 #include "poll.h"
15
16 struct pollfd
17 {
18 int fd;
19 short events;
20 short revents;
21 }
22
23 int poll (struct pollfd *pArray, unsigned long n_fds, int timeout)
24
25 DESCRIPTION
26
27 This file, and the accompanying "poll.c", implement the System V
28 poll(2) system call for BSD systems (which typically do not provide
29 poll()). Poll() provides a method for multiplexing input and output
30 on multiple open file descriptors; in traditional BSD systems, that
31 capability is provided by select(). While the semantics of select()
32 differ from those of poll(), poll() can be readily emulated in terms
33 of select() -- which is how this function is implemented.
34
35 REFERENCES
36 Stevens, W. Richard. Unix Network Programming. Prentice-Hall, 1990.
37
38 NOTES
39 1. This software requires an ANSI C compiler.
40
41 LICENSE
42
43 This software is released under the following license:
44
45 Copyright (c) 1995-2002 Brian M. Clapper
46 All rights reserved.
47
48 Redistribution and use in source and binary forms are
49 permitted provided that: (1) source distributions retain
50 this entire copyright notice and comment; (2) modifications
51 made to the software are prominently mentioned, and a copy
52 of the original software (or a pointer to its location) are
53 included; and (3) distributions including binaries display
54 the following acknowledgement: "This product includes
55 software developed by Brian M. Clapper <bmc@clapper.org>"
56 in the documentation or other materials provided with the
57 distribution. The name of the author may not be used to
58 endorse or promote products derived from this software
59 without specific prior written permission.
60
61 THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS
62 OR IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE
63 IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
64 PARTICULAR PURPOSE.
65
66 Effectively, this means you can do what you want with the software
67 except remove this notice or take advantage of the author's name.
68 If you modify the software and redistribute your modified version,
69 you must indicate that your version is a modification of the
70 original, and you must provide either a pointer to or a copy of the
71 original.
72 \*---------------------------------------------------------------------------*/
73
74 #ifndef _POLL_EMUL_H_
75 #define _POLL_EMUL_H_
76
77 #define POLLIN 0x01
78 #define POLLPRI 0x02
79 #define POLLOUT 0x04
80 #define POLLERR 0x08
81 #define POLLHUP 0x10
82 #define POLLNVAL 0x20
83
84 struct pollfd
85 {
86 int fd;
87 short events;
88 short revents;
89 };
90
91 #ifdef __cplusplus
92 extern "C"
93 {
94 #endif
95
96 #if (__STDC__ > 0) || defined(__cplusplus)
97 extern int poll (struct pollfd *pArray, unsigned long n_fds, int timeout);
98 #else
99 extern int poll();
100 #endif
101
102 #ifdef __cplusplus
103 }
104 #endif
105
106 #endif
107
108 #endif /* _POLL_EMUL_H_ */