/* $OpenBSD: sem.h,v 1.26 2024/10/26 05:39:03 jsg Exp $ */ /* $NetBSD: sem.h,v 1.8 1996/02/09 18:25:29 christos Exp $ */ /* * SVID compatible sem.h file * * Author: Daniel Boulet */ #ifndef _SYS_SEM_H_ #define _SYS_SEM_H_ #ifndef _SYS_IPC_H_ #include <sys/ipc.h> #endif #if __BSD_VISIBLE /* sem-specific sysctl variables corresponding to members of struct seminfo */ #define KERN_SEMINFO_SEMMNI 1 /* int: # of semaphore identifiers */ #define KERN_SEMINFO_SEMMNS 2 /* int: # of semaphores in system */ #define KERN_SEMINFO_SEMMNU 3 /* int: # of undo structures in system */ #define KERN_SEMINFO_SEMMSL 4 /* int: max semaphores per id */ #define KERN_SEMINFO_SEMOPM 5 /* int: max operations per semop call */ #define KERN_SEMINFO_SEMUME 6 /* int: max undo entries per process */ #define KERN_SEMINFO_SEMUSZ 7 /* int: size in bytes of struct undo */ #define KERN_SEMINFO_SEMVMX 8 /* int: semaphore maximum value */ #define KERN_SEMINFO_SEMAEM 9 /* int: adjust on exit max value */ #define KERN_SEMINFO_MAXID 10 /* number of valid semaphore sysctls */ #define CTL_KERN_SEMINFO_NAMES { \ { 0, 0 }, \ { "semmni", CTLTYPE_INT }, \ { "semmns", CTLTYPE_INT }, \ { "semmnu", CTLTYPE_INT }, \ { "semmsl", CTLTYPE_INT }, \ { "semopm", CTLTYPE_INT }, \ { "semume", CTLTYPE_INT }, \ { "semusz", CTLTYPE_INT }, \ { "semvmx", CTLTYPE_INT }, \ { "semaem", CTLTYPE_INT }, \ } #endif /* __BSD_VISIBLE */ struct sem { unsigned short semval; /* semaphore value */ pid_t sempid; /* pid of last operation */ unsigned short semncnt; /* # awaiting semval > cval */ unsigned short semzcnt; /* # awaiting semval = 0 */ }; struct semid_ds { struct ipc_perm sem_perm; /* operation permission struct */ struct sem *sem_base; /* pointer to first semaphore in set */ unsigned short sem_nsems; /* number of sems in set */ time_t sem_otime; /* last operation time */ long sem_pad1; /* SVABI/386 says I need this here */ time_t sem_ctime; /* last change time */ /* Times measured in secs since */ /* 00:00:00 GMT, Jan. 1, 1970 */ long sem_pad2; /* SVABI/386 says I need this here */ long sem_pad3[4]; /* SVABI/386 says I need this here */ }; /* * semop's sops parameter structure */ struct sembuf { unsigned short sem_num; /* semaphore # */ short sem_op; /* semaphore operation */ short sem_flg; /* operation flags */ }; #define SEM_UNDO 010000 /* * semctl's arg parameter structure */ union semun { int val; /* value for SETVAL */ struct semid_ds *buf; /* buffer for IPC_STAT & IPC_SET */ unsigned short *array; /* array for GETALL & SETALL */ }; /* * commands for semctl */ #define GETNCNT 3 /* Return the value of semncnt {READ} */ #define GETPID 4 /* Return the value of sempid {READ} */ #define GETVAL 5 /* Return the value of semval {READ} */ #define GETALL 6 /* Return semvals into arg.array {READ} */ #define GETZCNT 7 /* Return the value of semzcnt {READ} */ #define SETVAL 8 /* Set the value of semval to arg.val {ALTER} */ #define SETALL 9 /* Set semvals from arg.array {ALTER} */ /* * Permissions */ #define SEM_A 0200 /* alter permission */ #define SEM_R 0400 /* read permission */ #ifdef _KERNEL #include <sys/queue.h> /* * Kernel implementation stuff */ #define SEMVMX 32767 /* semaphore maximum value */ #define SEMAEM 16384 /* adjust on exit max value */ /* * Undo structure (one per process) */ struct sem_undo { SLIST_ENTRY(sem_undo) un_next; /* ptr to next active undo structure */ struct process *un_proc; /* owner of this structure */ short un_cnt; /* # of active entries */ struct undo { short un_adjval; /* adjust on exit values */ short un_num; /* semaphore # */ int un_id; /* semid */ } un_ent[1]; /* undo entries */ }; /* * semaphore info struct */ struct seminfo { int semmni, /* # of semaphore identifiers */ semmns, /* # of semaphores in system */ semmnu, /* # of undo structures in system */ semmsl, /* max # of semaphores per id */ semopm, /* max # of operations per semop call */ semume, /* max # of undo entries per process */ semusz, /* size in bytes of undo structure */ semvmx, /* semaphore maximum value */ semaem; /* adjust on exit max value */ }; struct sem_sysctl_info { struct seminfo seminfo; struct semid_ds semids[1]; }; extern struct seminfo seminfo; /* * Configuration parameters */ #ifndef SEMMNI #define SEMMNI 10 /* # of semaphore identifiers */ #endif #ifndef SEMMNS #define SEMMNS 60 /* # of semaphores in system */ #endif #ifndef SEMUME #define SEMUME 10 /* max # of undo entries per process */ #endif #ifndef SEMMNU #define SEMMNU 30 /* # of undo structures in system */ #endif /* shouldn't need tuning */ #ifndef SEMMSL #define SEMMSL SEMMNS /* max # of semaphores per id */ #endif #ifndef SEMOPM #define SEMOPM 100 /* max # of operations per semop call */ #endif /* actual size of an undo structure */ #define SEMUSZ (sizeof(struct sem_undo)+sizeof(struct undo)*SEMUME) extern struct semid_ds **sema; /* semaphore id list */ void seminit(void); void semexit(struct process *); int sysctl_sysvsem(int *, u_int, void *, size_t *, void *, size_t); #endif /* _KERNEL */ #ifndef _KERNEL __BEGIN_DECLS int semctl(int, int, int, ...); int __semctl(int, int, int, union semun *); int semget(key_t, int, int); int semop(int, struct sembuf *, size_t); __END_DECLS #endif /* !_KERNEL */ #endif /* !_SYS_SEM_H_ */
