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ETR_STRUCT_SEMUN
1.1 (2001/07/26) Miscellaneous @ ac-archive-0.5.39
Warren Young <warren@etr-usa.com>
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_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