1*a353d785SJoerg Wunsch /* $Id: sem.h,v 1.6 1995/08/30 00:33:34 bde Exp $ */ 23d903220SDoug Rabson /* $NetBSD: sem.h,v 1.5 1994/06/29 06:45:15 cgd Exp $ */ 33d903220SDoug Rabson 43d903220SDoug Rabson /* 53d903220SDoug Rabson * SVID compatible sem.h file 63d903220SDoug Rabson * 73d903220SDoug Rabson * Author: Daniel Boulet 83d903220SDoug Rabson */ 93d903220SDoug Rabson 103d903220SDoug Rabson #ifndef _SYS_SEM_H_ 113d903220SDoug Rabson #define _SYS_SEM_H_ 123d903220SDoug Rabson 133d903220SDoug Rabson #include <sys/ipc.h> 143d903220SDoug Rabson 153d903220SDoug Rabson struct sem { 163d903220SDoug Rabson u_short semval; /* semaphore value */ 173d903220SDoug Rabson pid_t sempid; /* pid of last operation */ 183d903220SDoug Rabson u_short semncnt; /* # awaiting semval > cval */ 193d903220SDoug Rabson u_short semzcnt; /* # awaiting semval = 0 */ 203d903220SDoug Rabson }; 213d903220SDoug Rabson 223d903220SDoug Rabson struct semid_ds { 233d903220SDoug Rabson struct ipc_perm sem_perm; /* operation permission struct */ 243d903220SDoug Rabson struct sem *sem_base; /* pointer to first semaphore in set */ 253d903220SDoug Rabson u_short sem_nsems; /* number of sems in set */ 263d903220SDoug Rabson time_t sem_otime; /* last operation time */ 273d903220SDoug Rabson long sem_pad1; /* SVABI/386 says I need this here */ 283d903220SDoug Rabson time_t sem_ctime; /* last change time */ 293d903220SDoug Rabson /* Times measured in secs since */ 303d903220SDoug Rabson /* 00:00:00 GMT, Jan. 1, 1970 */ 313d903220SDoug Rabson long sem_pad2; /* SVABI/386 says I need this here */ 323d903220SDoug Rabson long sem_pad3[4]; /* SVABI/386 says I need this here */ 333d903220SDoug Rabson }; 343d903220SDoug Rabson 353d903220SDoug Rabson /* 363d903220SDoug Rabson * semop's sops parameter structure 373d903220SDoug Rabson */ 383d903220SDoug Rabson struct sembuf { 393d903220SDoug Rabson u_short sem_num; /* semaphore # */ 403d903220SDoug Rabson short sem_op; /* semaphore operation */ 413d903220SDoug Rabson short sem_flg; /* operation flags */ 423d903220SDoug Rabson }; 433d903220SDoug Rabson #define SEM_UNDO 010000 443d903220SDoug Rabson 453d903220SDoug Rabson #define MAX_SOPS 5 /* maximum # of sembuf's per semop call */ 463d903220SDoug Rabson 473d903220SDoug Rabson /* 483d903220SDoug Rabson * semctl's arg parameter structure 493d903220SDoug Rabson */ 503d903220SDoug Rabson union semun { 513d903220SDoug Rabson int val; /* value for SETVAL */ 523d903220SDoug Rabson struct semid_ds *buf; /* buffer for IPC_STAT & IPC_SET */ 533d903220SDoug Rabson u_short *array; /* array for GETALL & SETALL */ 543d903220SDoug Rabson }; 553d903220SDoug Rabson 563d903220SDoug Rabson /* 573d903220SDoug Rabson * commands for semctl 583d903220SDoug Rabson */ 593d903220SDoug Rabson #define GETNCNT 3 /* Return the value of semncnt {READ} */ 603d903220SDoug Rabson #define GETPID 4 /* Return the value of sempid {READ} */ 613d903220SDoug Rabson #define GETVAL 5 /* Return the value of semval {READ} */ 623d903220SDoug Rabson #define GETALL 6 /* Return semvals into arg.array {READ} */ 633d903220SDoug Rabson #define GETZCNT 7 /* Return the value of semzcnt {READ} */ 643d903220SDoug Rabson #define SETVAL 8 /* Set the value of semval to arg.val {ALTER} */ 653d903220SDoug Rabson #define SETALL 9 /* Set semvals from arg.array {ALTER} */ 663d903220SDoug Rabson 67aed5ecb7SJoerg Wunsch /* 68aed5ecb7SJoerg Wunsch * Permissions 69aed5ecb7SJoerg Wunsch */ 70aed5ecb7SJoerg Wunsch #define SEM_A 0200 /* alter permission */ 71aed5ecb7SJoerg Wunsch #define SEM_R 0400 /* read permission */ 72aed5ecb7SJoerg Wunsch 733d903220SDoug Rabson #ifdef KERNEL 743d903220SDoug Rabson /* 753d903220SDoug Rabson * Kernel implementation stuff 763d903220SDoug Rabson */ 773d903220SDoug Rabson #define SEMVMX 32767 /* semaphore maximum value */ 783d903220SDoug Rabson #define SEMAEM 16384 /* adjust on exit max value */ 793d903220SDoug Rabson 803d903220SDoug Rabson 813d903220SDoug Rabson /* 823d903220SDoug Rabson * Undo structure (one per process) 833d903220SDoug Rabson */ 843d903220SDoug Rabson struct sem_undo { 853d903220SDoug Rabson struct sem_undo *un_next; /* ptr to next active undo structure */ 863d903220SDoug Rabson struct proc *un_proc; /* owner of this structure */ 873d903220SDoug Rabson short un_cnt; /* # of active entries */ 883d903220SDoug Rabson struct undo { 893d903220SDoug Rabson short un_adjval; /* adjust on exit values */ 903d903220SDoug Rabson short un_num; /* semaphore # */ 913d903220SDoug Rabson int un_id; /* semid */ 923d903220SDoug Rabson } un_ent[1]; /* undo entries */ 933d903220SDoug Rabson }; 943d903220SDoug Rabson 953d903220SDoug Rabson /* 963d903220SDoug Rabson * semaphore info struct 973d903220SDoug Rabson */ 983d903220SDoug Rabson struct seminfo { 993d903220SDoug Rabson int semmap, /* # of entries in semaphore map */ 1003d903220SDoug Rabson semmni, /* # of semaphore identifiers */ 1013d903220SDoug Rabson semmns, /* # of semaphores in system */ 1023d903220SDoug Rabson semmnu, /* # of undo structures in system */ 1033d903220SDoug Rabson semmsl, /* max # of semaphores per id */ 1043d903220SDoug Rabson semopm, /* max # of operations per semop call */ 1053d903220SDoug Rabson semume, /* max # of undo entries per process */ 1063d903220SDoug Rabson semusz, /* size in bytes of undo structure */ 1073d903220SDoug Rabson semvmx, /* semaphore maximum value */ 1083d903220SDoug Rabson semaem; /* adjust on exit max value */ 1093d903220SDoug Rabson }; 110789668e2SDavid Greenman extern struct seminfo seminfo; 1113d903220SDoug Rabson 1123d903220SDoug Rabson /* internal "mode" bits */ 1133d903220SDoug Rabson #define SEM_ALLOC 01000 /* semaphore is allocated */ 1143d903220SDoug Rabson #define SEM_DEST 02000 /* semaphore will be destroyed on last detach */ 1153d903220SDoug Rabson 1163d903220SDoug Rabson /* 1173d903220SDoug Rabson * Configuration parameters 1183d903220SDoug Rabson */ 1193d903220SDoug Rabson #ifndef SEMMNI 1203d903220SDoug Rabson #define SEMMNI 10 /* # of semaphore identifiers */ 1213d903220SDoug Rabson #endif 1223d903220SDoug Rabson #ifndef SEMMNS 1233d903220SDoug Rabson #define SEMMNS 60 /* # of semaphores in system */ 1243d903220SDoug Rabson #endif 1253d903220SDoug Rabson #ifndef SEMUME 1263d903220SDoug Rabson #define SEMUME 10 /* max # of undo entries per process */ 1273d903220SDoug Rabson #endif 1283d903220SDoug Rabson #ifndef SEMMNU 1293d903220SDoug Rabson #define SEMMNU 30 /* # of undo structures in system */ 1303d903220SDoug Rabson #endif 1313d903220SDoug Rabson 1323d903220SDoug Rabson /* shouldn't need tuning */ 1333d903220SDoug Rabson #ifndef SEMMAP 1343d903220SDoug Rabson #define SEMMAP 30 /* # of entries in semaphore map */ 1353d903220SDoug Rabson #endif 1363d903220SDoug Rabson #ifndef SEMMSL 1373d903220SDoug Rabson #define SEMMSL SEMMNS /* max # of semaphores per id */ 1383d903220SDoug Rabson #endif 1393d903220SDoug Rabson #ifndef SEMOPM 1403d903220SDoug Rabson #define SEMOPM 100 /* max # of operations per semop call */ 1413d903220SDoug Rabson #endif 1423d903220SDoug Rabson 1433d903220SDoug Rabson /* actual size of an undo structure */ 1443d903220SDoug Rabson #define SEMUSZ (sizeof(struct sem_undo)+sizeof(struct undo)*SEMUME) 1453d903220SDoug Rabson 14628f8db14SBruce Evans extern struct semid_ds *sema; /* semaphore id pool */ 14728f8db14SBruce Evans extern struct sem *sem; /* semaphore pool */ 14828f8db14SBruce Evans extern struct map *semmap; /* semaphore allocation map */ 14928f8db14SBruce Evans extern struct sem_undo *semu_list; /* list of active undo structures */ 15028f8db14SBruce Evans extern int *semu; /* undo structure pool */ 1513d903220SDoug Rabson 1523d903220SDoug Rabson /* 1533d903220SDoug Rabson * Macro to find a particular sem_undo vector 1543d903220SDoug Rabson */ 1553d903220SDoug Rabson #define SEMU(ix) ((struct sem_undo *)(((long)semu)+ix * SEMUSZ)) 1563d903220SDoug Rabson 1573d903220SDoug Rabson /* 158*a353d785SJoerg Wunsch * Process sem_undo vectors at proc exit. 159*a353d785SJoerg Wunsch */ 160*a353d785SJoerg Wunsch void semexit __P((struct proc *p)); 161*a353d785SJoerg Wunsch 162*a353d785SJoerg Wunsch /* 1633d903220SDoug Rabson * Parameters to the semconfig system call 1643d903220SDoug Rabson */ 1653d903220SDoug Rabson typedef enum { 1663d903220SDoug Rabson SEM_CONFIG_FREEZE, /* Freeze the semaphore facility. */ 1673d903220SDoug Rabson SEM_CONFIG_THAW /* Thaw the semaphore facility. */ 1683d903220SDoug Rabson } semconfig_ctl_t; 1693d903220SDoug Rabson #endif /* KERNEL */ 1703d903220SDoug Rabson 1713d903220SDoug Rabson #ifndef KERNEL 1723d903220SDoug Rabson #include <sys/cdefs.h> 1733d903220SDoug Rabson 1743d903220SDoug Rabson __BEGIN_DECLS 1753d903220SDoug Rabson int semsys __P((int, ...)); 1763d903220SDoug Rabson int semctl __P((int, int, int, union semun)); 1773d903220SDoug Rabson int semget __P((key_t, int, int)); 1783d903220SDoug Rabson int semop __P((int, struct sembuf *,unsigned)); 1793d903220SDoug Rabson __END_DECLS 1803d903220SDoug Rabson #endif /* !KERNEL */ 1813d903220SDoug Rabson 1823d903220SDoug Rabson #endif /* !_SEM_H_ */ 183