@node ax_struct_semun
@unnumberedsec ax_struct_semun

@majorheading Synopsis

@smallexample
AX_STRUCT_SEMUN
@end smallexample

@majorheading Description

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().

You should call AX_SYSV_IPC before this macro, to separate the check for
System V IPC headers from the check for struct semun.

@majorheading Source Code

Download the
@uref{http://git.savannah.gnu.org/gitweb/?p=autoconf-archive.git;a=blob_plain;f=m4/ax_struct_semun.m4,latest
version of @file{ax_struct_semun.m4}} or browse
@uref{http://git.savannah.gnu.org/gitweb/?p=autoconf-archive.git;a=history;f=m4/ax_struct_semun.m4,the
macro's revision history}.

@majorheading License

@w{Copyright @copyright{} 2008 Warren Young @email{warren@@etr-usa.com}}

Copying and distribution of this file, with or without modification, are
permitted in any medium without royalty provided the copyright notice
and this notice are preserved. This file is offered as-is, without any
warranty.