[apple/libc.git] / sys / semctl.c

/*
 * Copyright (c) 2004 Apple Computer, Inc. All rights reserved.
 *
 * @APPLE_LICENSE_HEADER_START@
 * 
 * This file contains Original Code and/or Modifications of Original Code
 * as defined in and that are subject to the Apple Public Source License
 * Version 2.0 (the 'License'). You may not use this file except in
 * compliance with the License. Please obtain a copy of the License at
 * http://www.opensource.apple.com/apsl/ and read it before using this
 * file.
 * 
 * The Original Code and all software distributed under the License are
 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
 * Please see the License for the specific language governing rights and
 * limitations under the License.
 * 
 * @APPLE_LICENSE_HEADER_END@
 */
#include <unistd.h>
#include <stdarg.h>
#include <sys/sem.h>

#include <errno.h>
/*
 * Because KERNEL is defined, including errno.h doesn't define errno, so
 * we have to do it ourselves.
 */
extern int * __error(void);
#define errno (*__error())

/*
 * Legacy stub to account for the differences in the ipc_perm structure,
 * while maintaining binary backward compatibility.
 */
extern int __semctl(int semid, int semnum, int cmd, void *);

int
semctl(int semid, int semnum, int cmd, ...)
{
	va_list			ap;
	int			rv;
	int			val = 0;
	struct __semid_ds_new	ds;
	struct __semid_ds_new	*ds_new = &ds;
	struct __semid_ds_old   *ds_old = NULL;

	va_start(ap, cmd);
	if (cmd == SETVAL)
		val = va_arg(ap, int);
	else
		ds_old = va_arg(ap, struct __semid_ds_old *);
	va_end(ap);

#define	_UP_CVT(x)	ds_new-> x = ds_old-> x
#define	_DN_CVT(x)	ds_old-> x = ds_new-> x

	if ((cmd == IPC_SET || cmd == IPC_STAT) && ds_old == NULL) {
		/* Return EFAULT if ds_old is NULL (like the kernel would do) */
		errno = EFAULT;
		return -1;
	}
	if (cmd == IPC_SET) {
		/* convert before call */
		_UP_CVT(sem_perm.uid);
		_UP_CVT(sem_perm.gid);
		_UP_CVT(sem_perm.cuid);
		_UP_CVT(sem_perm.cgid);
		_UP_CVT(sem_perm.mode);
		ds_new->sem_perm._seq = ds_old->sem_perm.seq;
		ds_new->sem_perm._key = ds_old->sem_perm.key;
		_UP_CVT(sem_base);
		_UP_CVT(sem_nsems);
		_UP_CVT(sem_otime);
		_UP_CVT(sem_pad1);	/* binary compatibility */
		_UP_CVT(sem_ctime);
		_UP_CVT(sem_pad2);	/* binary compatibility */
		_UP_CVT(sem_pad3[0]);	/* binary compatibility */
		_UP_CVT(sem_pad3[1]);	/* binary compatibility */
		_UP_CVT(sem_pad3[2]);	/* binary compatibility */
		_UP_CVT(sem_pad3[3]);	/* binary compatibility */
	}
	switch (cmd) {
	case SETVAL:
		/* syscall must use LP64 quantities */
		rv = __semctl(semid, semnum, cmd, (void *)val);
		break;
	case IPC_SET:
	case IPC_STAT:
		rv = __semctl(semid, semnum, cmd, ds_new);
		break;
	default:
		rv = __semctl(semid, semnum, cmd, ds_old);
		break;
	}

	if (cmd == IPC_STAT) {
		/* convert after call */
		_DN_CVT(sem_perm.uid);	/* warning!  precision loss! */
		_DN_CVT(sem_perm.gid);	/* warning!  precision loss! */
		_DN_CVT(sem_perm.cuid);	/* warning!  precision loss! */
		_DN_CVT(sem_perm.cgid);	/* warning!  precision loss! */
		_DN_CVT(sem_perm.mode);
		ds_old->sem_perm.seq = ds_new->sem_perm._seq;
		ds_old->sem_perm.key = ds_new->sem_perm._key;
		_DN_CVT(sem_base);
		_DN_CVT(sem_nsems);
		_DN_CVT(sem_otime);
		_DN_CVT(sem_pad1);	/* binary compatibility */
		_DN_CVT(sem_ctime);
		_DN_CVT(sem_pad2);	/* binary compatibility */
		_DN_CVT(sem_pad3[0]);	/* binary compatibility */
		_DN_CVT(sem_pad3[1]);	/* binary compatibility */
		_DN_CVT(sem_pad3[2]);	/* binary compatibility */
		_DN_CVT(sem_pad3[3]);	/* binary compatibility */
	}

	return (rv);
}
Commit	Line	Data
3d9156a7 A	1	/*
	2	* Copyright (c) 2004 Apple Computer, Inc. All rights reserved.
	3	*
	4	* @APPLE_LICENSE_HEADER_START@
	5	*
	6	* This file contains Original Code and/or Modifications of Original Code
	7	* as defined in and that are subject to the Apple Public Source License
	8	* Version 2.0 (the 'License'). You may not use this file except in
	9	* compliance with the License. Please obtain a copy of the License at
	10	* http://www.opensource.apple.com/apsl/ and read it before using this
	11	* file.
	12	*
	13	* The Original Code and all software distributed under the License are
	14	* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
	15	* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
	16	* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
	17	* FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
	18	* Please see the License for the specific language governing rights and
	19	* limitations under the License.
	20	*
	21	* @APPLE_LICENSE_HEADER_END@
	22	*/
	23	#include <unistd.h>
	24	#include <stdarg.h>
	25	#include <sys/sem.h>
224c7076	26
224c7076 A	27	#include <errno.h>
	28	/*
	29	* Because KERNEL is defined, including errno.h doesn't define errno, so
	30	* we have to do it ourselves.
	31	*/
	32	extern int * __error(void);
	33	#define errno (*__error())
3d9156a7 A	34
3d9156a7 A	35	/*
34e8f829	36	* Legacy stub to account for the differences in the ipc_perm structure,
3d9156a7 A	37	* while maintaining binary backward compatibility.
3d9156a7 A	38	*/
224c7076 A	39	extern int __semctl(int semid, int semnum, int cmd, void *);
224c7076 A	40
3d9156a7 A	41	int
	42	semctl(int semid, int semnum, int cmd, ...)
	43	{
3d9156a7	44	va_list ap;
224c7076 A	45	int rv;
224c7076 A	46	int val = 0;
3d9156a7 A	47	struct __semid_ds_new ds;
3d9156a7 A	48	struct __semid_ds_new *ds_new = &ds;
224c7076	49	struct __semid_ds_old *ds_old = NULL;
3d9156a7 A	50
3d9156a7 A	51	va_start(ap, cmd);
224c7076 A	52	if (cmd == SETVAL)
	53	val = va_arg(ap, int);
	54	else
	55	ds_old = va_arg(ap, struct __semid_ds_old *);
3d9156a7 A	56	va_end(ap);
	57
	58	#define _UP_CVT(x) ds_new-> x = ds_old-> x
	59	#define _DN_CVT(x) ds_old-> x = ds_new-> x
	60
224c7076 A	61	if ((cmd == IPC_SET \|\| cmd == IPC_STAT) && ds_old == NULL) {
	62	/* Return EFAULT if ds_old is NULL (like the kernel would do) */
	63	errno = EFAULT;
	64	return -1;
	65	}
3d9156a7 A	66	if (cmd == IPC_SET) {
	67	/* convert before call */
	68	_UP_CVT(sem_perm.uid);
	69	_UP_CVT(sem_perm.gid);
	70	_UP_CVT(sem_perm.cuid);
	71	_UP_CVT(sem_perm.cgid);
	72	_UP_CVT(sem_perm.mode);
	73	ds_new->sem_perm._seq = ds_old->sem_perm.seq;
	74	ds_new->sem_perm._key = ds_old->sem_perm.key;
	75	_UP_CVT(sem_base);
	76	_UP_CVT(sem_nsems);
	77	_UP_CVT(sem_otime);
	78	_UP_CVT(sem_pad1); /* binary compatibility */
	79	_UP_CVT(sem_ctime);
	80	_UP_CVT(sem_pad2); /* binary compatibility */
	81	_UP_CVT(sem_pad3[0]); /* binary compatibility */
	82	_UP_CVT(sem_pad3[1]); /* binary compatibility */
	83	_UP_CVT(sem_pad3[2]); /* binary compatibility */
	84	_UP_CVT(sem_pad3[3]); /* binary compatibility */
	85	}
224c7076 A	86	switch (cmd) {
	87	case SETVAL:
	88	/* syscall must use LP64 quantities */
	89	rv = __semctl(semid, semnum, cmd, (void *)val);
	90	break;
	91	case IPC_SET:
	92	case IPC_STAT:
	93	rv = __semctl(semid, semnum, cmd, ds_new);
	94	break;
	95	default:
	96	rv = __semctl(semid, semnum, cmd, ds_old);
	97	break;
	98	}
3d9156a7 A	99
	100	if (cmd == IPC_STAT) {
	101	/* convert after call */
	102	_DN_CVT(sem_perm.uid); /* warning! precision loss! */
	103	_DN_CVT(sem_perm.gid); /* warning! precision loss! */
	104	_DN_CVT(sem_perm.cuid); /* warning! precision loss! */
	105	_DN_CVT(sem_perm.cgid); /* warning! precision loss! */
	106	_DN_CVT(sem_perm.mode);
224c7076 A	107	ds_old->sem_perm.seq = ds_new->sem_perm._seq;
224c7076 A	108	ds_old->sem_perm.key = ds_new->sem_perm._key;
3d9156a7 A	109	_DN_CVT(sem_base);
	110	_DN_CVT(sem_nsems);
	111	_DN_CVT(sem_otime);
	112	_DN_CVT(sem_pad1); /* binary compatibility */
	113	_DN_CVT(sem_ctime);
	114	_DN_CVT(sem_pad2); /* binary compatibility */
	115	_DN_CVT(sem_pad3[0]); /* binary compatibility */
	116	_DN_CVT(sem_pad3[1]); /* binary compatibility */
	117	_DN_CVT(sem_pad3[2]); /* binary compatibility */
	118	_DN_CVT(sem_pad3[3]); /* binary compatibility */
	119	}
	120
	121	return (rv);
3d9156a7	122	}