1 /* $NetBSD: sem.h,v 1.5 1994/06/29 06:45:15 cgd Exp $ */ 2 3 /* 4 * SVID compatible sem.h file 5 * 6 * Author: Daniel Boulet 7 */ 8 9 #ifndef _SYS_SEM_H_ 10 #define _SYS_SEM_H_ 11 12 #ifdef _WANT_SYSVSEM_INTERNALS 13 #define _WANT_SYSVIPC_INTERNALS 14 #endif 15 #include <sys/ipc.h> 16 17 #ifndef _PID_T_DECLARED 18 typedef __pid_t pid_t; 19 #define _PID_T_DECLARED 20 #endif 21 22 #ifndef _SIZE_T_DECLARED 23 typedef __size_t size_t; 24 #define _SIZE_T_DECLARED 25 #endif 26 27 #ifndef _TIME_T_DECLARED 28 typedef __time_t time_t; 29 #define _TIME_T_DECLARED 30 #endif 31 32 #if defined(COMPAT_FREEBSD4) || defined(COMPAT_FREEBSD5) || \ 33 defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD7) 34 struct semid_ds_old { 35 struct ipc_perm_old sem_perm; /* operation permission struct */ 36 struct sem *__sem_base; /* pointer to first semaphore in set */ 37 unsigned short sem_nsems; /* number of sems in set */ 38 time_t sem_otime; /* last operation time */ 39 long sem_pad1; /* SVABI/386 says I need this here */ 40 time_t sem_ctime; /* last change time */ 41 /* Times measured in secs since */ 42 /* 00:00:00 UTC, Jan. 1, 1970, without leap seconds */ 43 long sem_pad2; /* SVABI/386 says I need this here */ 44 long sem_pad3[4]; /* SVABI/386 says I need this here */ 45 }; 46 #endif 47 48 struct semid_ds { 49 struct ipc_perm sem_perm; /* operation permission struct */ 50 struct sem *__sem_base; /* pointer to first semaphore in set */ 51 unsigned short sem_nsems; /* number of sems in set */ 52 time_t sem_otime; /* last operation time */ 53 time_t sem_ctime; /* last change time */ 54 /* Times measured in secs since */ 55 /* 00:00:00 UTC, Jan. 1, 1970, without leap seconds */ 56 }; 57 58 /* 59 * semop's sops parameter structure 60 */ 61 struct sembuf { 62 unsigned short sem_num; /* semaphore # */ 63 short sem_op; /* semaphore operation */ 64 short sem_flg; /* operation flags */ 65 }; 66 #define SEM_UNDO 010000 67 68 #if defined(COMPAT_FREEBSD4) || defined(COMPAT_FREEBSD5) || \ 69 defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD7) || \ 70 defined(_WANT_SEMUN_OLD) 71 union semun_old { 72 int val; /* value for SETVAL */ 73 struct semid_ds_old *buf; /* buffer for IPC_STAT & IPC_SET */ 74 unsigned short *array; /* array for GETALL & SETALL */ 75 }; 76 #endif 77 78 #if defined(_KERNEL) || defined(_WANT_SEMUN) 79 /* 80 * semctl's arg parameter structure 81 */ 82 union semun { 83 int val; /* value for SETVAL */ 84 struct semid_ds *buf; /* buffer for IPC_STAT & IPC_SET */ 85 unsigned short *array; /* array for GETALL & SETALL */ 86 }; 87 #endif 88 89 /* 90 * commands for semctl 91 */ 92 #define GETNCNT 3 /* Return the value of semncnt {READ} */ 93 #define GETPID 4 /* Return the value of sempid {READ} */ 94 #define GETVAL 5 /* Return the value of semval {READ} */ 95 #define GETALL 6 /* Return semvals into arg.array {READ} */ 96 #define GETZCNT 7 /* Return the value of semzcnt {READ} */ 97 #define SETVAL 8 /* Set the value of semval to arg.val {ALTER} */ 98 #define SETALL 9 /* Set semvals from arg.array {ALTER} */ 99 #define SEM_STAT 10 /* Like IPC_STAT but treats semid as sema-index */ 100 #define SEM_INFO 11 /* Like IPC_INFO but treats semid as sema-index */ 101 102 /* 103 * Permissions 104 */ 105 #define SEM_A IPC_W /* alter permission */ 106 #define SEM_R IPC_R /* read permission */ 107 108 #if defined(_KERNEL) || defined(_WANT_SYSVSEM_INTERNALS) 109 /* 110 * semaphore info struct 111 */ 112 struct seminfo { 113 int semmni; /* # of semaphore identifiers */ 114 int semmns; /* # of semaphores in system */ 115 int semmnu; /* # of undo structures in system */ 116 int semmsl; /* max # of semaphores per id */ 117 int semopm; /* max # of operations per semop call */ 118 int semume; /* max # of undo entries per process */ 119 int semusz; /* size in bytes of undo structure */ 120 int semvmx; /* semaphore maximum value */ 121 int semaem; /* adjust on exit max value */ 122 }; 123 124 /* 125 * Kernel wrapper for the user-level structure 126 */ 127 struct semid_kernel { 128 struct semid_ds u; 129 struct label *label; /* MAC framework label */ 130 struct ucred *cred; /* creator's credentials */ 131 }; 132 133 /* internal "mode" bits */ 134 #define SEM_ALLOC 01000 /* semaphore is allocated */ 135 #define SEM_DEST 02000 /* semaphore will be destroyed on last detach */ 136 #endif 137 138 #ifdef _KERNEL 139 extern struct seminfo seminfo; 140 /* 141 * Process sem_undo vectors at proc exit. 142 */ 143 void semexit(struct proc *p); 144 145 int kern_get_sema(struct thread *td, struct semid_kernel **res, 146 size_t *sz); 147 148 #else /* !_KERNEL */ 149 150 __BEGIN_DECLS 151 int semctl(int, int, int, ...); 152 int semget(key_t, int, int); 153 int semop(int, struct sembuf *, size_t); 154 __END_DECLS 155 156 #endif /* !_KERNEL */ 157 158 #endif /* !_SYS_SEM_H_ */ 159