1#include <sys/sem.h>
2#include <stdarg.h>
3#include "syscall.h"
4#include "ipc.h"
5
6union semun {
7	int val;
8	struct semid_ds *buf;
9	unsigned short *array;
10};
11
12int semctl(int id, int num, int cmd, ...)
13{
14	union semun arg = {0};
15	va_list ap;
16	switch (cmd) {
17	case SETVAL: case GETALL: case SETALL: case IPC_STAT: case IPC_SET:
18	case IPC_INFO: case SEM_INFO: case SEM_STAT:
19		va_start(ap, cmd);
20		arg = va_arg(ap, union semun);
21		va_end(ap);
22	}
23#ifdef SYS_semctl
24	return syscall(SYS_semctl, id, num, cmd | IPC_64, arg.buf);
25#else
26	return syscall(SYS_ipc, IPCOP_semctl, id, num, cmd | IPC_64, &arg.buf);
27#endif
28}
29