[apple/xnu.git] / bsd / sys / sem_internal.h

/*
 * Copyright (c) 2000-2007 Apple Inc. All rights reserved.
 *
 * @APPLE_OSREFERENCE_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. The rights granted to you under the License
 * may not be used to create, or enable the creation or redistribution of,
 * unlawful or unlicensed copies of an Apple operating system, or to
 * circumvent, violate, or enable the circumvention or violation of, any
 * terms of an Apple operating system software license agreement.
 * 
 * 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_OSREFERENCE_LICENSE_HEADER_END@
 */
/*
 * NOTICE: This file was modified by SPARTA, Inc. in 2005 to introduce
 * support for mandatory and extensible security protections.  This notice
 * is included in support of clause 2.2 (b) of the Apple Public License,
 * Version 2.0.
 */
/*	$NetBSD: sem.h,v 1.5 1994/06/29 06:45:15 cgd Exp $	*/

/*
 * SVID compatible sem_internal.h file
 *
 * Author:  Daniel Boulet
 */
/*
 * John Bellardo modified the implementation for Darwin. 12/2000
 */

#ifndef _SYS_SEM__INTERNALH_
#define _SYS_SEM__INTERNALH_

#include <sys/sem.h>
#include <sys/cdefs.h>


/*
 * This structure is variant for 64 bits because of sem_otime and sem_ctime.
 */

#if __DARWIN_ALIGN_NATURAL
#pragma options align=natural
#endif

struct user_semid_ds {
	struct ipc_perm sem_perm;	/* [XSI] operation permission struct */
	struct sem	*sem_base;	/* 32 bit base ptr for semaphore set */
	unsigned short	sem_nsems;	/* [XSI] number of sems in set */
	user_time_t	sem_otime;	/* [XSI] last operation time */
	__int32_t	sem_pad1;	/* RESERVED: DO NOT USE! */
	user_time_t	sem_ctime;	/* [XSI] last change time */
    					/* Times measured in secs since */
    					/* 00:00:00 GMT, Jan. 1, 1970 */
	__int32_t	sem_pad2;	/* RESERVED: DO NOT USE! */
	__int32_t	sem_pad3[4];	/* RESERVED: DO NOT USE! */
};

#pragma pack(4)
struct user64_semid_ds {
	struct ipc_perm sem_perm;	/* [XSI] operation permission struct */
	int32_t	sem_base;	/* 32 bit base ptr for semaphore set */
	unsigned short	sem_nsems;	/* [XSI] number of sems in set */
	user64_time_t	sem_otime;	/* [XSI] last operation time */
	int32_t	sem_pad1;	/* RESERVED: DO NOT USE! */
	user64_time_t	sem_ctime;	/* [XSI] last change time */
    					/* Times measured in secs since */
    					/* 00:00:00 GMT, Jan. 1, 1970 */
	int32_t	sem_pad2;	/* RESERVED: DO NOT USE! */
	int32_t	sem_pad3[4];	/* RESERVED: DO NOT USE! */
};

struct user32_semid_ds {
	struct ipc_perm sem_perm;	/* [XSI] operation permission struct */
	int32_t	sem_base;	/* 32 bit base ptr for semaphore set */
	unsigned short	sem_nsems;	/* [XSI] number of sems in set */
	user32_time_t	sem_otime;	/* [XSI] last operation time */
	int32_t	sem_pad1;	/* RESERVED: DO NOT USE! */
	user32_time_t	sem_ctime;	/* [XSI] last change time */
    					/* Times measured in secs since */
    					/* 00:00:00 GMT, Jan. 1, 1970 */
	int32_t	sem_pad2;	/* RESERVED: DO NOT USE! */
	int32_t	sem_pad3[4];	/* RESERVED: DO NOT USE! */
};
#pragma pack()

union user_semun {
	user_addr_t	buf;		/* buffer for IPC_STAT & IPC_SET */
	user_addr_t	array;		/* array for GETALL & SETALL */
};
typedef union user_semun user_semun_t;

#if __DARWIN_ALIGN_NATURAL
#pragma options align=reset
#endif


/*
 * Kernel implementation stuff
 */
#define SEMVMX	32767		/* semaphore maximum value */
#define SEMAEM	16384		/* adjust on exit max value */

/*
 * Configuration parameters.  SEMMNI, SEMMNS, and SEMMNU are hard limits.
 * The code dynamically allocates enough memory to satisfy the current
 * demand in even increments of SEMMNI_INC, SEMMNS_INC, and SEMMNU_INC.
 * The code will never allocate more than the hard limits.  The *_INC's
 * are defined in the kernel section of the header.
 */
/*
 * Configuration parameters
 */
#ifndef SEMMNS			/* # of semaphores in system */
#define SEMMNS	(1048576/sizeof(struct sem))
#endif				/* no more than 1M of semaphore data */
#ifndef SEMMNI			/* # of semaphore identifiers */
#define SEMMNI	SEMMNS		/* max of 1 for each semaphore */
#endif
#ifndef SEMUME
#define SEMUME	10		/* max # of undo entries per process */
#endif
#ifndef SEMMNU			/* # of undo structures in system */
#define SEMMNU	SEMMNS		/* 1 for each semaphore.  This is quite large */
#endif				/* This should be max 1 for each process */

/* shouldn't need tuning */
#ifndef SEMMAP
#define SEMMAP	30		/* # of entries in semaphore map */
#endif
#ifndef SEMMSL
#define SEMMSL	SEMMNS		/* max # of semaphores per id */
#endif
#ifndef SEMOPM
#define SEMOPM	100		/* max # of operations per semop call */
#endif


/*
 * Undo structure (internal: one per process)
 */
struct sem_undo {
	int 	un_next_idx;	/* index of next active undo structure */
	struct	proc *un_proc;		/* owner of this structure */
	short	un_cnt;			/* # of active entries */
	struct undo {
		short	une_adjval;	/* adjust on exit values */
		short	une_num;	/* semaphore # */
		int	une_id;		/* semid */
		struct undo *une_next;	/* next undo entry */
	} *un_ent;			/* undo entries */
};

/*
 * semaphore info struct (internal; for administrative limits and ipcs)
 */
struct seminfo {
	int	semmap,		/* # of entries in semaphore map */
		semmni,		/* # of semaphore identifiers */
		semmns,		/* # of semaphores in system */
		semmnu,		/* # of undo structures in system */
		semmsl,		/* max # of semaphores per id */
		semopm,		/* max # of operations per semop call */
		semume,		/* max # of undo entries per process */
		semusz,		/* size in bytes of undo structure */
		semvmx,		/* semaphore maximum value */
		semaem;		/* adjust on exit max value */
};
extern struct seminfo	seminfo;

/*
 * Kernel wrapper for the user-level structure
 */
struct semid_kernel {
	struct	user_semid_ds u;
	struct	label *label;	/* MAC framework label */
};


/* internal "mode" bits */
#define	SEM_ALLOC	01000	/* semaphore is allocated */
#define	SEM_DEST	02000	/* semaphore will be destroyed on last detach */

#define SEMMNI_INC	8	/* increment value for semaphore identifiers */
#define SEMMNS_INC	64	/* increment value for semaphores */
#define SEMMNU_INC	32	/* increment value for undo structures */

/*
 * Due to the way semaphore memory is allocated, we have to ensure that
 * SEMUSZ is properly aligned.
 *
 * We are not doing strange semaphore memory allocation anymore, so
 * these macros are no longer needed.
 */

/*
 * #define SEM_ALIGN(bytes) (((bytes) + (sizeof(long) - 1)) & ~(sizeof(long) - 1))
 */

/* actual size of an undo structure */
/*
 * #define SEMUSZ	SEM_ALIGN(offsetof(struct sem_undo, un_ent[SEMUME]))
 */
#define SEMUSZ		sizeof(struct sem_undo)

extern struct semid_kernel	*sema;		/* semaphore id pool */
extern struct sem		*sem_pool;	/* semaphore pool */
/* This is now a struct sem_undo with the new memory allocation 
 * extern int	*semu;		// undo structure pool
 */
extern struct sem_undo	*semu;		/* undo structure pool */

/*
 * Macro to find a particular sem_undo vector
 */
/* Until we can initialize seminfo.semusz to SEMUSZ, we hard code the size macro
 * in SEMU.  This should be fixed when (if) we implement dynamic pool sizes
 *
 * #define SEMU(ix)     ((struct sem_undo *)(((intptr_t)semu)+ix * seminfo.semusz))
 */
/*
 * This macro doesn't work because we are using a staticly allocated array
 * for semu now.
 * #define SEMU(ix)        ((struct sem_undo *)(((intptr_t)semu)+ix * SEMUSZ)) 
 */
#define SEMU(ix)        (&semu[ix])


/*
 * Process sem_undo vectors at proc exit.
 */
void	semexit(struct proc *p);

#endif /* !_SYS_SEM__INTERNALH_ */
Commit	Line	Data
91447636	1	/*
2d21ac55	2	* Copyright (c) 2000-2007 Apple Inc. All rights reserved.
5d5c5d0d	3	*
2d21ac55	4	* @APPLE_OSREFERENCE_LICENSE_HEADER_START@
91447636	5	*
2d21ac55 A	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. The rights granted to you under the License
	10	* may not be used to create, or enable the creation or redistribution of,
	11	* unlawful or unlicensed copies of an Apple operating system, or to
	12	* circumvent, violate, or enable the circumvention or violation of, any
	13	* terms of an Apple operating system software license agreement.
8f6c56a5	14	*
2d21ac55 A	15	* Please obtain a copy of the License at
	16	* http://www.opensource.apple.com/apsl/ and read it before using this file.
	17	*
	18	* The Original Code and all software distributed under the License are
	19	* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
8f6c56a5 A	20	* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
8f6c56a5 A	21	* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
2d21ac55 A	22	* FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
	23	* Please see the License for the specific language governing rights and
	24	* limitations under the License.
8f6c56a5	25	*
2d21ac55 A	26	* @APPLE_OSREFERENCE_LICENSE_HEADER_END@
	27	*/
	28	/*
	29	* NOTICE: This file was modified by SPARTA, Inc. in 2005 to introduce
	30	* support for mandatory and extensible security protections. This notice
	31	* is included in support of clause 2.2 (b) of the Apple Public License,
	32	* Version 2.0.
91447636 A	33	*/
	34	/* $NetBSD: sem.h,v 1.5 1994/06/29 06:45:15 cgd Exp $ */
	35
	36	/*
	37	* SVID compatible sem_internal.h file
	38	*
	39	* Author: Daniel Boulet
	40	*/
	41	/*
	42	* John Bellardo modified the implementation for Darwin. 12/2000
	43	*/
	44
	45	#ifndef _SYS_SEM__INTERNALH_
	46	#define _SYS_SEM__INTERNALH_
	47
	48	#include <sys/sem.h>
	49	#include <sys/cdefs.h>
	50
	51
	52	/*
	53	* This structure is variant for 64 bits because of sem_otime and sem_ctime.
	54	*/
	55
	56	#if __DARWIN_ALIGN_NATURAL
	57	#pragma options align=natural
	58	#endif
	59
	60	struct user_semid_ds {
	61	struct ipc_perm sem_perm; /* [XSI] operation permission struct */
	62	struct sem sem_base; / 32 bit base ptr for semaphore set */
	63	unsigned short sem_nsems; /* [XSI] number of sems in set */
	64	user_time_t sem_otime; /* [XSI] last operation time */
	65	__int32_t sem_pad1; /* RESERVED: DO NOT USE! */
	66	user_time_t sem_ctime; /* [XSI] last change time */
	67	/* Times measured in secs since */
	68	/* 00:00:00 GMT, Jan. 1, 1970 */
	69	__int32_t sem_pad2; /* RESERVED: DO NOT USE! */
	70	__int32_t sem_pad3[4]; /* RESERVED: DO NOT USE! */
	71	};
	72
b0d623f7 A	73	#pragma pack(4)
	74	struct user64_semid_ds {
	75	struct ipc_perm sem_perm; /* [XSI] operation permission struct */
	76	int32_t sem_base; /* 32 bit base ptr for semaphore set */
	77	unsigned short sem_nsems; /* [XSI] number of sems in set */
	78	user64_time_t sem_otime; /* [XSI] last operation time */
	79	int32_t sem_pad1; /* RESERVED: DO NOT USE! */
	80	user64_time_t sem_ctime; /* [XSI] last change time */
	81	/* Times measured in secs since */
	82	/* 00:00:00 GMT, Jan. 1, 1970 */
	83	int32_t sem_pad2; /* RESERVED: DO NOT USE! */
	84	int32_t sem_pad3[4]; /* RESERVED: DO NOT USE! */
	85	};
	86
	87	struct user32_semid_ds {
	88	struct ipc_perm sem_perm; /* [XSI] operation permission struct */
	89	int32_t sem_base; /* 32 bit base ptr for semaphore set */
	90	unsigned short sem_nsems; /* [XSI] number of sems in set */
	91	user32_time_t sem_otime; /* [XSI] last operation time */
	92	int32_t sem_pad1; /* RESERVED: DO NOT USE! */
	93	user32_time_t sem_ctime; /* [XSI] last change time */
	94	/* Times measured in secs since */
	95	/* 00:00:00 GMT, Jan. 1, 1970 */
	96	int32_t sem_pad2; /* RESERVED: DO NOT USE! */
	97	int32_t sem_pad3[4]; /* RESERVED: DO NOT USE! */
	98	};
	99	#pragma pack()
	100
91447636 A	101	union user_semun {
	102	user_addr_t buf; /* buffer for IPC_STAT & IPC_SET */
	103	user_addr_t array; /* array for GETALL & SETALL */
	104	};
	105	typedef union user_semun user_semun_t;
	106
	107	#if __DARWIN_ALIGN_NATURAL
	108	#pragma options align=reset
	109	#endif
	110
	111
	112	/*
	113	* Kernel implementation stuff
	114	*/
	115	#define SEMVMX 32767 /* semaphore maximum value */
	116	#define SEMAEM 16384 /* adjust on exit max value */
	117
	118	/*
	119	* Configuration parameters. SEMMNI, SEMMNS, and SEMMNU are hard limits.
	120	* The code dynamically allocates enough memory to satisfy the current
	121	* demand in even increments of SEMMNI_INC, SEMMNS_INC, and SEMMNU_INC.
	122	* The code will never allocate more than the hard limits. The *_INC's
	123	* are defined in the kernel section of the header.
	124	*/
	125	/*
	126	* Configuration parameters
	127	*/
	128	#ifndef SEMMNS /* # of semaphores in system */
	129	#define SEMMNS (1048576/sizeof(struct sem))
	130	#endif /* no more than 1M of semaphore data */
	131	#ifndef SEMMNI /* # of semaphore identifiers */
	132	#define SEMMNI SEMMNS /* max of 1 for each semaphore */
	133	#endif
	134	#ifndef SEMUME
	135	#define SEMUME 10 /* max # of undo entries per process */
	136	#endif
	137	#ifndef SEMMNU /* # of undo structures in system */
	138	#define SEMMNU SEMMNS /* 1 for each semaphore. This is quite large */
	139	#endif /* This should be max 1 for each process */
	140
	141	/* shouldn't need tuning */
	142	#ifndef SEMMAP
	143	#define SEMMAP 30 /* # of entries in semaphore map */
	144	#endif
	145	#ifndef SEMMSL
	146	#define SEMMSL SEMMNS /* max # of semaphores per id */
	147	#endif
	148	#ifndef SEMOPM
	149	#define SEMOPM 100 /* max # of operations per semop call */
	150	#endif
	151
	152
	153	/*
	154	* Undo structure (internal: one per process)
	155	*/
	156	struct sem_undo {
2d21ac55	157	int un_next_idx; /* index of next active undo structure */
91447636 A	158	struct proc un_proc; / owner of this structure */
	159	short un_cnt; /* # of active entries */
	160	struct undo {
	161	short une_adjval; /* adjust on exit values */
	162	short une_num; /* semaphore # */
	163	int une_id; /* semid */
	164	struct undo une_next; / next undo entry */
	165	} un_ent; / undo entries */
	166	};
	167
	168	/*
	169	* semaphore info struct (internal; for administrative limits and ipcs)
	170	*/
	171	struct seminfo {
	172	int semmap, /* # of entries in semaphore map */
	173	semmni, /* # of semaphore identifiers */
	174	semmns, /* # of semaphores in system */
	175	semmnu, /* # of undo structures in system */
	176	semmsl, /* max # of semaphores per id */
	177	semopm, /* max # of operations per semop call */
	178	semume, /* max # of undo entries per process */
	179	semusz, /* size in bytes of undo structure */
	180	semvmx, /* semaphore maximum value */
	181	semaem; /* adjust on exit max value */
	182	};
	183	extern struct seminfo seminfo;
	184
2d21ac55 A	185	/*
	186	* Kernel wrapper for the user-level structure
	187	*/
	188	struct semid_kernel {
	189	struct user_semid_ds u;
	190	struct label label; / MAC framework label */
	191	};
	192
	193
91447636 A	194	/* internal "mode" bits */
	195	#define SEM_ALLOC 01000 /* semaphore is allocated */
	196	#define SEM_DEST 02000 /* semaphore will be destroyed on last detach */
	197
	198	#define SEMMNI_INC 8 /* increment value for semaphore identifiers */
	199	#define SEMMNS_INC 64 /* increment value for semaphores */
	200	#define SEMMNU_INC 32 /* increment value for undo structures */
	201
	202	/*
	203	* Due to the way semaphore memory is allocated, we have to ensure that
	204	* SEMUSZ is properly aligned.
	205	*
	206	* We are not doing strange semaphore memory allocation anymore, so
	207	* these macros are no longer needed.
	208	*/
	209
	210	/*
	211	* #define SEM_ALIGN(bytes) (((bytes) + (sizeof(long) - 1)) & ~(sizeof(long) - 1))
	212	*/
	213
	214	/* actual size of an undo structure */
	215	/*
	216	* #define SEMUSZ SEM_ALIGN(offsetof(struct sem_undo, un_ent[SEMUME]))
	217	*/
	218	#define SEMUSZ sizeof(struct sem_undo)
	219
2d21ac55	220	extern struct semid_kernel sema; / semaphore id pool */
91447636 A	221	extern struct sem sem_pool; / semaphore pool */
	222	/* This is now a struct sem_undo with the new memory allocation
	223	* extern int *semu; // undo structure pool
	224	*/
	225	extern struct sem_undo semu; / undo structure pool */
	226
	227	/*
	228	* Macro to find a particular sem_undo vector
	229	*/
	230	/* Until we can initialize seminfo.semusz to SEMUSZ, we hard code the size macro
	231	* in SEMU. This should be fixed when (if) we implement dynamic pool sizes
	232	*
	233	* #define SEMU(ix) ((struct sem_undo )(((intptr_t)semu)+ix seminfo.semusz))
	234	*/
	235	/*
	236	* This macro doesn't work because we are using a staticly allocated array
	237	* for semu now.
	238	* #define SEMU(ix) ((struct sem_undo )(((intptr_t)semu)+ix SEMUSZ))
	239	*/
	240	#define SEMU(ix) (&semu[ix])
	241
	242
	243	/*
	244	* Process sem_undo vectors at proc exit.
	245	*/
	246	void semexit(struct proc *p);
	247
91447636	248	#endif /* !_SYS_SEM__INTERNALH_ */