summaryrefslogtreecommitdiff
path: root/libc/misc/sysvipc/sem.c
diff options
context:
space:
mode:
Diffstat (limited to 'libc/misc/sysvipc/sem.c')
-rw-r--r--libc/misc/sysvipc/sem.c79
1 files changed, 79 insertions, 0 deletions
diff --git a/libc/misc/sysvipc/sem.c b/libc/misc/sysvipc/sem.c
new file mode 100644
index 000000000..83724d4c6
--- /dev/null
+++ b/libc/misc/sysvipc/sem.c
@@ -0,0 +1,79 @@
+/* Copyright (C) 1995, 1997, 1998 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+ Contributed by Ulrich Drepper <drepper@gnu.ai.mit.edu>, August 1995.
+
+ 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.
+
+ 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.
+
+ 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. */
+
+#include <errno.h>
+#include <sys/sem.h>
+#include "ipc.h"
+
+#ifdef L_semctl
+/* Return identifier for array of NSEMS semaphores associated with
+ KEY. */
+#include <stdarg.h>
+/* Define a `union semun' suitable for Linux here. */
+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 */
+};
+
+
+int
+semctl (int semid, int semnum, int cmd, ...)
+{
+ union semun arg;
+ va_list ap;
+
+ va_start (ap, cmd);
+
+ /* Get the argument. */
+ arg = va_arg (ap, union semun);
+
+ va_end (ap);
+
+ return __ipc(IPCOP_semctl, semid, semnum, cmd, &arg);
+}
+#endif
+
+#ifdef L_semget
+#include <stdlib.h> /* for definition of NULL */
+/* Return identifier for array of NSEMS semaphores associated with
+ KEY. */
+int
+semget (key, nsems, semflg)
+ key_t key;
+ int nsems;
+ int semflg;
+{
+ return __ipc(IPCOP_semget, key, nsems, semflg, NULL);
+}
+#endif
+
+#ifdef L_semop
+/* Perform user-defined atomical operation of array of semaphores. */
+int
+semop (semid, sops, nsops)
+ int semid;
+ struct sembuf *sops;
+ unsigned int nsops;
+{
+ return __ipc(IPCOP_semop, semid, (int) nsops, 0, sops);
+}
+#endif