-/* Copyright (C) 1995, 1996, 1997 Free Software Foundation, Inc.
+/* Copyright (C) 1995-2023 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
- modify it under the terms of the GNU Library General Public License as
- published by the Free Software Foundation; either version 2 of the
- License, or (at your option) any later version.
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- Library General Public License for more details.
+ Lesser General Public License for more details.
- You should have received a copy of the GNU Library General Public
- License along with the GNU C Library; see the file COPYING.LIB. If not,
- write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
- Boston, MA 02111-1307, USA. */
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; if not, see
+ <https://www.gnu.org/licenses/>. */
#ifndef _SYS_SEM_H
# error "Never include <bits/sem.h> directly; use <sys/sem.h> instead."
unsigned short int sem_nsems; /* number of semaphores in set */
};
-/* Union used for argument for `semctl'. */
-union semun
-{
- int val; /* value for SETVAL */
- struct semid_ds *buf; /* buffer for IPC_STAT & IPC_SET */
- unsigned short int *array; /* array for GETALL & SETALL */
- struct seminfo *__buf; /* buffer for IPC_INFO */
- };
+/* The user should define a union like the following to use it for arguments
+ for `semctl'.
+
+ union semun
+ {
+ int val; <= value for SETVAL
+ struct semid_ds *buf; <= buffer for IPC_STAT & IPC_SET
+ unsigned short int *array; <= array for GETALL & SETALL
+ struct seminfo *__buf; <= buffer for IPC_INFO
+ };
+
+ Previous versions of this file used to define this union but this is
+ incorrect. One can test the macro _SEM_SEMUN_UNDEFINED to see whether
+ one must define the union or not. */
+#define _SEM_SEMUN_UNDEFINED 1