diff options
Diffstat (limited to 'sys/sys/sem.h')
| -rw-r--r-- | sys/sys/sem.h | 198 |
1 files changed, 198 insertions, 0 deletions
diff --git a/sys/sys/sem.h b/sys/sys/sem.h new file mode 100644 index 0000000..184482d --- /dev/null +++ b/sys/sys/sem.h @@ -0,0 +1,198 @@ +/* $OpenBSD: sem.h,v 1.24 2016/09/01 08:33:40 tom 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 */ + +struct proc; + +void seminit(void); +void semexit(struct process *); +int sysctl_sysvsem(int *, u_int, void *, size_t *, void *, size_t); +int semctl1(struct proc *, int, int, int, union semun *, register_t *, + int (*)(const void *, void *, size_t), + int (*)(const void *, 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_ */ |