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Commit	Line	Data
	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>
	26
	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())
	34
	35	/*
	36	* Legacy stub to account for the differences in the ipc_perm structure,
	37	* while maintaining binary backward compatibility.
	38	*/
	39	extern int __semctl(int semid, int semnum, int cmd, void *);
	40
	41	int
	42	semctl(int semid, int semnum, int cmd, ...)
	43	{
	44	va_list ap;
	45	int rv;
	46	int val = 0;
	47	struct __semid_ds_new ds;
	48	struct __semid_ds_new *ds_new = &ds;
	49	struct __semid_ds_old *ds_old = NULL;
	50
	51	va_start(ap, cmd);
	52	if (cmd == SETVAL)
	53	val = va_arg(ap, int);
	54	else
	55	ds_old = va_arg(ap, struct __semid_ds_old *);
	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
	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	}
	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	}
	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	}
	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);
	107	ds_old->sem_perm.seq = ds_new->sem_perm._seq;
	108	ds_old->sem_perm.key = ds_new->sem_perm._key;
	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);
	122	}