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 #if defined(COMPAT_FREEBSD4) || defined(COMPAT_FREEBSD5) || \ 31 defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD7) 32 struct semid_ds_old { 33 struct ipc_perm_old sem_perm; /* operation permission struct */ 34 struct sem *sem_base; /* pointer to first semaphore in set */ 35 unsigned short sem_nsems; /* number of sems in set */ 36 time_t sem_otime; /* last operation time */ 37 long sem_pad1; /* SVABI/386 says I need this here */ 38 time_t sem_ctime; /* last change time */ 39 /* Times measured in secs since */ 40 /* 00:00:00 UTC, Jan. 1, 1970, without leap seconds */ 41 long sem_pad2; /* SVABI/386 says I need this here */ 42 long sem_pad3[4]; /* SVABI/386 says I need this here */ 43 }; 44 #endif 45 46 struct semid_ds { 47 struct ipc_perm sem_perm; /* operation permission struct */ 48 struct sem *sem_base; /* pointer to first semaphore in set */ 49 unsigned short sem_nsems; /* number of sems in set */ 50 time_t sem_otime; /* last operation time */ 51 time_t sem_ctime; /* last change time */ 52 /* Times measured in secs since */ 53 /* 00:00:00 UTC, Jan. 1, 1970, without leap seconds */ 54 }; 55 56 /* 57 * semop's sops parameter structure 58 */ 59 struct sembuf { 60 unsigned short sem_num; /* semaphore # */ 61 short sem_op; /* semaphore operation */ 62 short sem_flg; /* operation flags */ 63 }; 64 #define SEM_UNDO 010000 65 66 #if defined(COMPAT_FREEBSD4) || defined(COMPAT_FREEBSD5) || \ 67 defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD7) || \ 68 defined(_WANT_SEMUN_OLD) 69 union semun_old { 70 int val; /* value for SETVAL */ 71 struct semid_ds_old *buf; /* buffer for IPC_STAT & IPC_SET */ 72 unsigned short *array; /* array for GETALL & SETALL */ 73 }; 74 #endif 75 76 /* 77 * semctl's arg parameter structure 78 */ 79 union semun { 80 int val; /* value for SETVAL */ 81 struct semid_ds *buf; /* buffer for IPC_STAT & IPC_SET */ 82 unsigned short *array; /* array for GETALL & SETALL */ 83 }; 84 85 /* 86 * commands for semctl 87 */ 88 #define GETNCNT 3 /* Return the value of semncnt {READ} */ 89 #define GETPID 4 /* Return the value of sempid {READ} */ 90 #define GETVAL 5 /* Return the value of semval {READ} */ 91 #define GETALL 6 /* Return semvals into arg.array {READ} */ 92 #define GETZCNT 7 /* Return the value of semzcnt {READ} */ 93 #define SETVAL 8 /* Set the value of semval to arg.val {ALTER} */ 94 #define SETALL 9 /* Set semvals from arg.array {ALTER} */ 95 #define SEM_STAT 10 /* Like IPC_STAT but treats semid as sema-index */ 96 #define SEM_INFO 11 /* Like IPC_INFO but treats semid as sema-index */ 97 98 /* 99 * Permissions 100 */ 101 #define SEM_A IPC_W /* alter permission */ 102 #define SEM_R IPC_R /* read permission */ 103 104 #ifdef _KERNEL 105 106 /* 107 * semaphore info struct 108 */ 109 struct seminfo { 110 int semmni, /* # of semaphore identifiers */ 111 semmns, /* # of semaphores in system */ 112 semmnu, /* # of undo structures in system */ 113 semmsl, /* max # of semaphores per id */ 114 semopm, /* max # of operations per semop call */ 115 semume, /* max # of undo entries per process */ 116 semusz, /* size in bytes of undo structure */ 117 semvmx, /* semaphore maximum value */ 118 semaem; /* adjust on exit max value */ 119 }; 120 extern struct seminfo seminfo; 121 122 /* 123 * Kernel wrapper for the user-level structure 124 */ 125 struct semid_kernel { 126 struct semid_ds u; 127 struct label *label; /* MAC framework label */ 128 struct ucred *cred; /* creator's credentials */ 129 }; 130 131 /* internal "mode" bits */ 132 #define SEM_ALLOC 01000 /* semaphore is allocated */ 133 #define SEM_DEST 02000 /* semaphore will be destroyed on last detach */ 134 135 /* 136 * Process sem_undo vectors at proc exit. 137 */ 138 void semexit(struct proc *p); 139 140 #endif /* _KERNEL */ 141 142 #if !defined(_KERNEL) || defined(_WANT_SEM_PROTOTYPES) 143 __BEGIN_DECLS 144 #if __BSD_VISIBLE 145 int semsys(int, ...); 146 #endif 147 int semctl(int, int, int, ...); 148 int semget(key_t, int, int); 149 int semop(int, struct sembuf *, size_t); 150 __END_DECLS 151 152 #endif /* !_KERNEL || _WANT_SEM_PROTOTYPES */ 153 154 #endif /* !_SYS_SEM_H_ */ 155