98 lines
1.8 KiB
C
98 lines
1.8 KiB
C
#define __USE_MISC
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#define _SYSTEM 1
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#define _MINIX 1
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#include <minix/com.h>
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#include <minix/config.h>
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#include <minix/ipc.h>
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#include <minix/endpoint.h>
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#include <minix/sysutil.h>
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#include <minix/const.h>
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#include <minix/type.h>
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#include <minix/rs.h>
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#include <lib.h>
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#include <sys/types.h>
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#include <sys/ipc.h>
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#include <sys/sem.h>
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#include <stdlib.h>
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#include <stdarg.h>
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#include <errno.h>
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PRIVATE int get_ipc_endpt(endpoint_t *pt)
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{
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return minix_rs_lookup("ipc", pt);
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}
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/* Get semaphore. */
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PUBLIC int semget(key_t key, int nsems, int semflag)
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{
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message m;
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endpoint_t ipc_pt;
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int r;
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if (get_ipc_endpt(&ipc_pt) != OK) {
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errno = ENOSYS;
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return -1;
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}
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m.SEMGET_KEY = key;
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m.SEMGET_NR = nsems;
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m.SEMGET_FLAG = semflag;
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r = _syscall(ipc_pt, IPC_SEMGET, &m);
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if (r != OK)
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return r;
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return m.SEMGET_RETID;
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}
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/* Semaphore control operation. */
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PUBLIC int semctl(int semid, int semnum, int cmd, ...)
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{
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message m;
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endpoint_t ipc_pt;
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va_list ap;
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int r;
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if (get_ipc_endpt(&ipc_pt) != OK) {
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errno = ENOSYS;
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return -1;
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}
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m.SEMCTL_ID = semid;
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m.SEMCTL_NUM = semnum;
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m.SEMCTL_CMD = cmd;
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va_start(ap, cmd);
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if (cmd == IPC_STAT || cmd == IPC_SET || cmd == IPC_INFO ||
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cmd == SEM_INFO || cmd == SEM_STAT || cmd == GETALL ||
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cmd == SETALL || cmd == SETVAL)
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m.SEMCTL_OPT = (long) va_arg(ap, long);
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va_end(ap);
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r = _syscall(ipc_pt, IPC_SEMCTL, &m);
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if ((r != -1) && (cmd == GETNCNT || cmd == GETZCNT || cmd == GETPID ||
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cmd == GETVAL || cmd == IPC_INFO || cmd == SEM_INFO ||
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cmd == SEM_STAT))
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return m.SHMCTL_RET;
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return r;
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}
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/* Operate on semaphore. */
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PUBLIC int semop(int semid, struct sembuf *sops, size_t nsops)
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{
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message m;
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endpoint_t ipc_pt;
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if (get_ipc_endpt(&ipc_pt) != OK) {
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errno = ENOSYS;
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return -1;
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}
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m.SEMOP_ID = semid;
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m.SEMOP_OPS = (long) sops;
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m.SEMOP_SIZE = nsops;
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return _syscall(ipc_pt, IPC_SEMOP, &m);
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}
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