1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
|
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01//EN"
"http://www.w3.org/TR/html4/strict.dtd">
<html lang="en">
<head>
<title>Autoconf Macro: etr_struct_semun</title>
<link rel="stylesheet" type="text/css" href="ac-archive.css">
</head>
<body>
<table summary="web navigation" style="width:100%;">
<tbody>
<tr>
<td style="width:50%;" align="center">[<a href="index.html">Macro Index
Page</a>]</td>
<td style="width:50%;" align="center">[<a href=
"../m4source/etr_struct_semun.m4">Download M4 Source</a>]</td>
</tr>
</tbody>
</table>
<hr>
<h1>etr_struct_semun</h1>
<h2>Synopsis</h2>
<div class="indent">
<p style="text-align:left; white-space:nowrap;">
<code>ETR_STRUCT_SEMUN</code></p>
</div>
<h2>Description</h2>
<div class="indent">
<p>This macro checks to see if sys/sem.h defines struct semun. Some systems
do, some systems don't. Your code must be able to deal with this
possibility; if HAVE_STRUCT_SEMUM isn't defined for a given system, you
have to define this structure before you can call functions like
semctl().</p>
<p>You should call ETR_SYSV_IPC before this macro, to separate the check
for System V IPC headers from the check for struct semun.</p>
</div>
<h2>Version</h2>
<div class="indent">
<p>1.3 (last modified: 2001-05-28)</p>
</div>
<h2>Author</h2>
<div class="indent">
<p>Warren Young <warren@etr-usa.com></p>
</div>
<h2>M4 Source Code</h2>
<div class="indent">
<pre class="m4source">
AC_DEFUN([ETR_STRUCT_SEMUN],
[
AC_CACHE_CHECK([for struct semun], ac_cv_struct_semun, [
AC_TRY_COMPILE(
[
#include <sys/types.h>
#include <sys/ipc.h>
#include <sys/sem.h>
],
[ struct semun s; ],
ac_cv_struct_semun=yes,
ac_cv_struct_semun=no)
])
if test x"$ac_cv_struct_semun" = "xyes"
then
AC_DEFINE(HAVE_STRUCT_SEMUN, 1,
[ Define if your system's sys/sem.h file defines struct semun ])
fi
]) dnl ETR_STRUCT_SEMUN
</pre>
</div>
<h2>Copyright</h2>
<div class="indent">
<a href="COPYING.html">GNU General Public License</a> with this special
<a href="COPYING-Exception.html">exception</a>.
</div>
</body>
</html>
|
