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/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License (the "License").
* You may not use this file except in compliance with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright 2008 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
/* Copyright (c) 1988 AT&T */
/* All Rights Reserved */
#pragma ident "%Z%%M% %I% %E% SMI"
#pragma weak _semctl = semctl
#pragma weak _semctl64 = semctl64
#pragma weak _semget = semget
#pragma weak _semop = semop
#pragma weak _semids = semids
#pragma weak _semtimedop = semtimedop
#include "lint.h"
#include <sys/types.h>
#include <sys/ipc.h>
#include <sys/ipc_impl.h>
#include <sys/sem.h>
#include <sys/sem_impl.h>
#include <sys/syscall.h>
#include <stdarg.h>
#include <errno.h>
union semun {
int val;
struct semid_ds *buf;
struct semid_ds64 *buf64;
ushort_t *array;
};
/*
* The kernel implementation of semsys expects an argument containing the
* value of the semun argument, but the Sparc compiler passes a pointer
* to it, since it is a union. So, we convert here and pass the value,
* but to keep the naive user from being penalized for the counterintuitive
* behaviour of the Sparc compiler, we ignore the union if it will not be
* used by the system call (to protect the caller from SIGSEGVs, e.g.
* semctl(semid, semnum, cmd, NULL); which would otherwise always result
* in a segmentation violation). We do this partly for consistency, since
* the ICL port did it. This all works just fine for the Intel compiler,
* which actually does pass the union by value.
*/
int
semctl(int semid, int semnum, int cmd, ...)
{
uintptr_t arg;
va_list ap;
switch (cmd) {
case SETVAL:
va_start(ap, cmd);
arg = (uintptr_t)va_arg(ap, union semun).val;
va_end(ap);
break;
case GETALL:
case SETALL:
va_start(ap, cmd);
arg = (uintptr_t)va_arg(ap, union semun).array;
va_end(ap);
break;
case IPC_STAT:
case IPC_SET:
va_start(ap, cmd);
arg = (uintptr_t)va_arg(ap, union semun).buf;
va_end(ap);
break;
case IPC_SET64:
case IPC_STAT64:
(void) __set_errno(EINVAL);
return (-1);
default:
arg = 0;
break;
}
return (syscall(SYS_semsys, SEMCTL, semid, semnum, cmd, arg));
}
int
semctl64(int semid, int semnum, int cmd, ...)
{
struct semid_ds64 *buf;
va_list ap;
if (cmd != IPC_SET64 && cmd != IPC_STAT64) {
(void) __set_errno(EINVAL);
return (-1);
}
va_start(ap, cmd);
buf = va_arg(ap, union semun).buf64;
va_end(ap);
return (syscall(SYS_semsys, SEMCTL, semid, semnum, cmd, buf));
}
int
semget(key_t key, int nsems, int semflg)
{
return (syscall(SYS_semsys, SEMGET, key, nsems, semflg));
}
int
semop(int semid, struct sembuf *sops, size_t nsops)
{
return (syscall(SYS_semsys, SEMOP, semid, sops, nsops));
}
int
semids(int *buf, uint_t nids, uint_t *pnids)
{
return (syscall(SYS_semsys, SEMIDS, buf, nids, pnids));
}
int
semtimedop(int semid, struct sembuf *sops, size_t nsops,
const timespec_t *timeout)
{
return (syscall(SYS_semsys, SEMTIMEDOP, semid, sops, nsops,
timeout));
}
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