82 lines
2 KiB
C
82 lines
2 KiB
C
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#ifndef _SYS_SEM_H
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#define _SYS_SEM_H
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#include <sys/types.h>
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#include <sys/ipc.h>
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#define SEMMNI 128
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#define SEMMSL 250
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#define SEMMNS (SEMMSL*SEMMNI)
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#define SEMOPM 32
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#define SEMVMX 32767
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/* Flags for `semop'. */
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#define SEM_UNDO 0x1000 /* undo the operation on exit */
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/* Commands for `semctl'. */
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#define GETPID 11 /* get sempid */
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#define GETVAL 12 /* get semval */
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#define GETALL 13 /* get all semval's */
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#define GETNCNT 14 /* get semncnt */
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#define GETZCNT 15 /* get semzcnt */
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#define SETVAL 16 /* set semval */
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#define SETALL 17 /* set all semval's */
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/* Data structure describing a set of semaphores. */
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struct semid_ds
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{
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struct ipc_perm sem_perm; /* operation permission struct */
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time_t sem_otime; /* last semop() time */
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unsigned long int __unused1;
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time_t sem_ctime; /* last time changed by semctl() */
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unsigned long int __unused2;
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unsigned long int sem_nsems; /* number of semaphores in set */
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unsigned long int __unused3;
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unsigned long int __unused4;
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};
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/* Structure used for argument to `semop' to describe operations. */
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struct sembuf
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{
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unsigned short int sem_num; /* semaphore number */
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short int sem_op; /* semaphore operation */
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short int sem_flg; /* operation flag */
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};
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/* Semaphore control operation. */
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_PROTOTYPE( int semctl, (int __semid, int __semnum, int __cmd, ...));
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/* Get semaphore. */
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_PROTOTYPE( int semget, (key_t __key, int __nsems, int __semflg));
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/* Operate on semaphore. */
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_PROTOTYPE( int semop, (int __semid, struct sembuf *__sops, size_t __nsops));
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#ifdef __USE_MISC
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/* ipcs ctl cmds */
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# define SEM_STAT 18
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# define SEM_INFO 19
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struct seminfo
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{
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int semmap;
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int semmni;
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int semmns;
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int semmnu;
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int semmsl;
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int semopm;
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int semume;
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int semusz;
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int semvmx;
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int semaem;
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};
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#endif /* __USE_MISC */
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#endif /* _SYS_SEM_H */
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