Warren Young <email@example.com>
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cryp.to ac-archive's Miscellaneous (released)
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 ETR_SYSV_IPC before this macro, to separate the
check for System V IPC headers from the check for struct semun.
AC_CACHE_CHECK([for struct semun], ac_cv_struct_semun, [
[ struct semun s; ],
if test x"$ac_cv_struct_semun" = "xyes"
[ Define if your system's sys/sem.h file defines struct semun ])
]) dnl ETR_STRUCT_SEMUN