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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01//EN"
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Autoconf Macro: etr_struct_semun
</title>
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<a href="http://autoconf-archive.cryp.to/etr_struct_semun.m4">Download M4
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<hr>
<h1>
etr_struct_semun
</h1>
<h2>
Synopsis
</h2>
<p class="indent" style="white-space:nowrap;">
<code>ETR_STRUCT_SEMUN</code>
</p>
<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>
Author
</h2>
<p class="indent">
Warren Young <warren@etr-usa.com>
</p>
<h2>
Last Modified
</h2>
<p class="indent">
2001-05-28
</p>
<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>
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