Annotation of sys/sys/sem.h, Revision 1.1
1.1 ! nbrk 1: /* $OpenBSD: sem.h,v 1.19 2005/12/13 00:35:23 millert Exp $ */
! 2: /* $NetBSD: sem.h,v 1.8 1996/02/09 18:25:29 christos 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/cdefs.h>
! 14: #ifndef _SYS_IPC_H_
! 15: #include <sys/ipc.h>
! 16: #endif
! 17: #include <sys/queue.h>
! 18:
! 19: #if __BSD_VISIBLE
! 20:
! 21: /* sem-specific sysctl variables corresponding to members of struct seminfo */
! 22: #define KERN_SEMINFO_SEMMNI 1 /* int: # of semaphore identifiers */
! 23: #define KERN_SEMINFO_SEMMNS 2 /* int: # of semaphores in system */
! 24: #define KERN_SEMINFO_SEMMNU 3 /* int: # of undo structures in system */
! 25: #define KERN_SEMINFO_SEMMSL 4 /* int: max semaphores per id */
! 26: #define KERN_SEMINFO_SEMOPM 5 /* int: max operations per semop call */
! 27: #define KERN_SEMINFO_SEMUME 6 /* int: max undo entries per process */
! 28: #define KERN_SEMINFO_SEMUSZ 7 /* int: size in bytes of struct undo */
! 29: #define KERN_SEMINFO_SEMVMX 8 /* int: semaphore maximum value */
! 30: #define KERN_SEMINFO_SEMAEM 9 /* int: adjust on exit max value */
! 31: #define KERN_SEMINFO_MAXID 10 /* number of valid semaphore sysctls */
! 32:
! 33: #define CTL_KERN_SEMINFO_NAMES { \
! 34: { 0, 0 }, \
! 35: { "semmni", CTLTYPE_INT }, \
! 36: { "semmns", CTLTYPE_INT }, \
! 37: { "semmnu", CTLTYPE_INT }, \
! 38: { "semmsl", CTLTYPE_INT }, \
! 39: { "semopm", CTLTYPE_INT }, \
! 40: { "semume", CTLTYPE_INT }, \
! 41: { "semusz", CTLTYPE_INT }, \
! 42: { "semvmx", CTLTYPE_INT }, \
! 43: { "semaem", CTLTYPE_INT }, \
! 44: }
! 45:
! 46: #endif /* __BSD_VISIBLE */
! 47:
! 48: struct sem {
! 49: unsigned short semval; /* semaphore value */
! 50: pid_t sempid; /* pid of last operation */
! 51: unsigned short semncnt; /* # awaiting semval > cval */
! 52: unsigned short semzcnt; /* # awaiting semval = 0 */
! 53: };
! 54:
! 55: struct semid_ds {
! 56: struct ipc_perm sem_perm; /* operation permission struct */
! 57: struct sem *sem_base; /* pointer to first semaphore in set */
! 58: unsigned short sem_nsems; /* number of sems in set */
! 59: time_t sem_otime; /* last operation time */
! 60: long sem_pad1; /* SVABI/386 says I need this here */
! 61: time_t sem_ctime; /* last change time */
! 62: /* Times measured in secs since */
! 63: /* 00:00:00 GMT, Jan. 1, 1970 */
! 64: long sem_pad2; /* SVABI/386 says I need this here */
! 65: long sem_pad3[4]; /* SVABI/386 says I need this here */
! 66: };
! 67:
! 68: #ifdef _KERNEL
! 69: struct semid_ds23 {
! 70: struct ipc_perm23 sem_perm; /* operation permission struct */
! 71: struct sem *sem_base; /* pointer to first semaphore in set */
! 72: unsigned short sem_nsems; /* number of sems in set */
! 73: time_t sem_otime; /* last operation time */
! 74: long sem_pad1; /* SVABI/386 says I need this here */
! 75: time_t sem_ctime; /* last change time */
! 76: /* Times measured in secs since */
! 77: /* 00:00:00 GMT, Jan. 1, 1970 */
! 78: long sem_pad2; /* SVABI/386 says I need this here */
! 79: long sem_pad3[4]; /* SVABI/386 says I need this here */
! 80: };
! 81:
! 82: struct semid_ds35 {
! 83: struct ipc_perm35 sem_perm; /* operation permission struct */
! 84: struct sem *sem_base; /* pointer to first semaphore in set */
! 85: unsigned short sem_nsems; /* number of sems in set */
! 86: time_t sem_otime; /* last operation time */
! 87: long sem_pad1; /* SVABI/386 says I need this here */
! 88: time_t sem_ctime; /* last change time */
! 89: /* Times measured in secs since */
! 90: /* 00:00:00 GMT, Jan. 1, 1970 */
! 91: long sem_pad2; /* SVABI/386 says I need this here */
! 92: long sem_pad3[4]; /* SVABI/386 says I need this here */
! 93: };
! 94: #endif
! 95:
! 96: /*
! 97: * semop's sops parameter structure
! 98: */
! 99: struct sembuf {
! 100: unsigned short sem_num; /* semaphore # */
! 101: short sem_op; /* semaphore operation */
! 102: short sem_flg; /* operation flags */
! 103: };
! 104: #define SEM_UNDO 010000
! 105:
! 106: /*
! 107: * semctl's arg parameter structure
! 108: */
! 109: union semun {
! 110: int val; /* value for SETVAL */
! 111: struct semid_ds *buf; /* buffer for IPC_STAT & IPC_SET */
! 112: unsigned short *array; /* array for GETALL & SETALL */
! 113: };
! 114:
! 115: /*
! 116: * commands for semctl
! 117: */
! 118: #define GETNCNT 3 /* Return the value of semncnt {READ} */
! 119: #define GETPID 4 /* Return the value of sempid {READ} */
! 120: #define GETVAL 5 /* Return the value of semval {READ} */
! 121: #define GETALL 6 /* Return semvals into arg.array {READ} */
! 122: #define GETZCNT 7 /* Return the value of semzcnt {READ} */
! 123: #define SETVAL 8 /* Set the value of semval to arg.val {ALTER} */
! 124: #define SETALL 9 /* Set semvals from arg.array {ALTER} */
! 125:
! 126:
! 127: /*
! 128: * Permissions
! 129: */
! 130: #define SEM_A 0200 /* alter permission */
! 131: #define SEM_R 0400 /* read permission */
! 132:
! 133:
! 134: #ifdef _KERNEL
! 135: /*
! 136: * Kernel implementation stuff
! 137: */
! 138: #define SEMVMX 32767 /* semaphore maximum value */
! 139: #define SEMAEM 16384 /* adjust on exit max value */
! 140:
! 141: /*
! 142: * Undo structure (one per process)
! 143: */
! 144: struct sem_undo {
! 145: SLIST_ENTRY(sem_undo) un_next; /* ptr to next active undo structure */
! 146: struct proc *un_proc; /* owner of this structure */
! 147: short un_cnt; /* # of active entries */
! 148: struct undo {
! 149: short un_adjval; /* adjust on exit values */
! 150: short un_num; /* semaphore # */
! 151: int un_id; /* semid */
! 152: } un_ent[1]; /* undo entries */
! 153: };
! 154:
! 155: /*
! 156: * semaphore info struct
! 157: */
! 158: struct seminfo {
! 159: int semmni, /* # of semaphore identifiers */
! 160: semmns, /* # of semaphores in system */
! 161: semmnu, /* # of undo structures in system */
! 162: semmsl, /* max # of semaphores per id */
! 163: semopm, /* max # of operations per semop call */
! 164: semume, /* max # of undo entries per process */
! 165: semusz, /* size in bytes of undo structure */
! 166: semvmx, /* semaphore maximum value */
! 167: semaem; /* adjust on exit max value */
! 168: };
! 169:
! 170: struct sem_sysctl_info {
! 171: struct seminfo seminfo;
! 172: struct semid_ds semids[1];
! 173: };
! 174:
! 175: extern struct seminfo seminfo;
! 176:
! 177: /*
! 178: * Configuration parameters
! 179: */
! 180: #ifndef SEMMNI
! 181: #define SEMMNI 10 /* # of semaphore identifiers */
! 182: #endif
! 183: #ifndef SEMMNS
! 184: #define SEMMNS 60 /* # of semaphores in system */
! 185: #endif
! 186: #ifndef SEMUME
! 187: #define SEMUME 10 /* max # of undo entries per process */
! 188: #endif
! 189: #ifndef SEMMNU
! 190: #define SEMMNU 30 /* # of undo structures in system */
! 191: #endif
! 192:
! 193: /* shouldn't need tuning */
! 194: #ifndef SEMMSL
! 195: #define SEMMSL SEMMNS /* max # of semaphores per id */
! 196: #endif
! 197: #ifndef SEMOPM
! 198: #define SEMOPM 100 /* max # of operations per semop call */
! 199: #endif
! 200:
! 201: /* actual size of an undo structure */
! 202: #define SEMUSZ (sizeof(struct sem_undo)+sizeof(struct undo)*SEMUME)
! 203:
! 204: extern struct semid_ds **sema; /* semaphore id list */
! 205:
! 206: #endif /* _KERNEL */
! 207:
! 208: #ifndef _KERNEL
! 209: __BEGIN_DECLS
! 210: int semctl(int, int, int, ...);
! 211: int __semctl(int, int, int, union semun *);
! 212: int semget(key_t, int, int);
! 213: int semop(int, struct sembuf *, size_t);
! 214: int semconfig(int);
! 215: __END_DECLS
! 216: #else
! 217: void seminit(void);
! 218: void semexit(struct proc *);
! 219: int sysctl_sysvsem(int *, u_int, void *, size_t *, void *, size_t);
! 220: int semctl1(struct proc *, int, int, int, union semun *, register_t *,
! 221: int (*)(const void *, void *, size_t),
! 222: int (*)(const void *, void *, size_t));
! 223: #endif /* !_KERNEL */
! 224:
! 225: #endif /* !_SEM_H_ */
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