Next: , Previous: , Up: The Macros  





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.

Source Code

Download the latest version of ax_struct_semun.m4 or browse the macro’s revision history.


Copyright © 2008 Warren Young

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.