forked from Bananymous/banan-os
55 lines
1.3 KiB
C
55 lines
1.3 KiB
C
#ifndef _SYS_SEM_H
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#define _SYS_SEM_H 1
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// https://pubs.opengroup.org/onlinepubs/9699919799/basedefs/sys_sem.h.html
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#include <sys/cdefs.h>
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__BEGIN_DECLS
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#define __need_pid_t
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#define __need_size_t
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#define __need_time_t
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#include <sys/types.h>
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#include <sys/ipc.h>
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#define SEM_UNDO 1
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#define GETNCNT 0
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#define GETPID 1
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#define GETVAL 2
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#define GETALL 3
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#define GETZCNT 4
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#define SETVAL 5
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#define SETALL 6
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struct semid_ds
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{
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struct ipc_perm sem_perm; /* Operation permission structure. */
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unsigned short sem_nsems; /* Number of semaphores in set. */
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time_t sem_otime; /* Last semop() time. */
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time_t sem_ctime; /* Last time changed by semctl(). */
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};
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// FIXME: A semaphore shall be represented by an anonymous structure, which shall include the following members:
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// unsigned short semval; /* Semaphore value. */
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// pid_t sempid; /* Process ID of last operation. */
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// unsigned short semncnt; /* Number of processes waiting for semval to become greater than current value. */
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// unsigned short semzcnt; /* Number of processes waiting for semval to become 0. */
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struct sembuf
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{
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unsigned short sem_num; /* Semaphore number. */
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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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int semctl(int, int, int, ...);
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int semget(key_t, int, int);
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int semop(int, struct sembuf *, size_t);
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__END_DECLS
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#endif
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