1 /* $FreeBSD$ */ 2 /* $NetBSD: sem.h,v 1.5 1994/06/29 06:45:15 cgd Exp $ */ 3 4 /* 5 * SVID compatible sem.h file 6 * 7 * Author: Daniel Boulet 8 */ 9 10 #ifndef _SYS_SEM_H_ 11 #define _SYS_SEM_H_ 12 13 #include <sys/ipc.h> 14 15 #ifndef _PID_T_DECLARED 16 typedef __pid_t pid_t; 17 #define _PID_T_DECLARED 18 #endif 19 20 #ifndef _SIZE_T_DECLARED 21 typedef __size_t size_t; 22 #define _SIZE_T_DECLARED 23 #endif 24 25 #ifndef _TIME_T_DECLARED 26 typedef __time_t time_t; 27 #define _TIME_T_DECLARED 28 #endif 29 30 struct semid_ds { 31 struct ipc_perm sem_perm; /* operation permission struct */ 32 struct sem *sem_base; /* pointer to first semaphore in set */ 33 unsigned short sem_nsems; /* number of sems in set */ 34 time_t sem_otime; /* last operation time */ 35 long sem_pad1; /* SVABI/386 says I need this here */ 36 time_t sem_ctime; /* last change time */ 37 /* Times measured in secs since */ 38 /* 00:00:00 GMT, Jan. 1, 1970 */ 39 long sem_pad2; /* SVABI/386 says I need this here */ 40 long sem_pad3[4]; /* SVABI/386 says I need this here */ 41 }; 42 43 /* 44 * semop's sops parameter structure 45 */ 46 struct sembuf { 47 unsigned short sem_num; /* semaphore # */ 48 short sem_op; /* semaphore operation */ 49 short sem_flg; /* operation flags */ 50 }; 51 #define SEM_UNDO 010000 52 53 /* 54 * semctl's arg parameter structure 55 */ 56 union semun { 57 int val; /* value for SETVAL */ 58 struct semid_ds *buf; /* buffer for IPC_STAT & IPC_SET */ 59 unsigned short *array; /* array for GETALL & SETALL */ 60 }; 61 62 /* 63 * commands for semctl 64 */ 65 #define GETNCNT 3 /* Return the value of semncnt {READ} */ 66 #define GETPID 4 /* Return the value of sempid {READ} */ 67 #define GETVAL 5 /* Return the value of semval {READ} */ 68 #define GETALL 6 /* Return semvals into arg.array {READ} */ 69 #define GETZCNT 7 /* Return the value of semzcnt {READ} */ 70 #define SETVAL 8 /* Set the value of semval to arg.val {ALTER} */ 71 #define SETALL 9 /* Set semvals from arg.array {ALTER} */ 72 #define SEM_STAT 10 /* Like IPC_STAT but treats semid as sema-index */ 73 #define SEM_INFO 11 /* Like IPC_INFO but treats semid as sema-index */ 74 75 /* 76 * Permissions 77 */ 78 #define SEM_A IPC_W /* alter permission */ 79 #define SEM_R IPC_R /* read permission */ 80 81 #ifdef _KERNEL 82 83 /* 84 * semaphore info struct 85 */ 86 struct seminfo { 87 int semmap, /* # of entries in semaphore map */ 88 semmni, /* # of semaphore identifiers */ 89 semmns, /* # of semaphores in system */ 90 semmnu, /* # of undo structures in system */ 91 semmsl, /* max # of semaphores per id */ 92 semopm, /* max # of operations per semop call */ 93 semume, /* max # of undo entries per process */ 94 semusz, /* size in bytes of undo structure */ 95 semvmx, /* semaphore maximum value */ 96 semaem; /* adjust on exit max value */ 97 }; 98 extern struct seminfo seminfo; 99 100 /* 101 * Kernel wrapper for the user-level structure 102 */ 103 struct semid_kernel { 104 struct semid_ds u; 105 struct label *label; /* MAC framework label */ 106 }; 107 108 /* internal "mode" bits */ 109 #define SEM_ALLOC 01000 /* semaphore is allocated */ 110 #define SEM_DEST 02000 /* semaphore will be destroyed on last detach */ 111 112 /* 113 * Process sem_undo vectors at proc exit. 114 */ 115 void semexit(struct proc *p); 116 117 #else /* ! _KERNEL */ 118 119 __BEGIN_DECLS 120 int semsys(int, ...); 121 int semctl(int, int, int, ...); 122 int semget(key_t, int, int); 123 int semop(int, struct sembuf *, size_t); 124 __END_DECLS 125 126 #endif /* !_KERNEL */ 127 128 #endif /* !_SYS_SEM_H_ */ 129