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#ifndef __TENDRA_SYS_SEM_H
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#define __TENDRA_SYS_SEM_H
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/*
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* semop's sops parameter structure
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*/
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struct sembuf {
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unsigned short sem_num; /* semaphore # */
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short sem_op; /* semaphore operation */
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short sem_flg; /* operation flags */
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};
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#define SEM_UNDO 010000
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struct semid_ds {
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struct ipc_perm sem_perm; /* operation permission struct */
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struct sem *__sem_base; /* pointer to first semaphore in set */
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unsigned short sem_nsems; /* number of sems in set */
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time_t sem_otime; /* last operation time */
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time_t sem_ctime; /* last change time */
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/* Times measured in secs since */
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/* 00:00:00 UTC, Jan. 1, 1970, without leap seconds */
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};
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/*
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* commands for semctl
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*/
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#define GETNCNT 3 /* Return the value of semncnt {READ} */
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#define GETPID 4 /* Return the value of sempid {READ} */
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#define GETVAL 5 /* Return the value of semval {READ} */
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#define GETALL 6 /* Return semvals into arg.array {READ} */
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#define GETZCNT 7 /* Return the value of semzcnt {READ} */
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#define SETVAL 8 /* Set the value of semval to arg.val {ALTER} */
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#define SETALL 9 /* Set semvals from arg.array {ALTER} */
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#define SEM_STAT 10 /* Like IPC_STAT but treats semid as sema-index */
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#define SEM_INFO 11 /* Like IPC_INFO but treats semid as sema-index */
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#endif
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