user: implement mlibc as the libc, finally.

It's finally done..

Signed-off-by: kaguya <vpshinomiya@protonmail.com>

user/include/mlibc/options/posix/generic/sys-sem.cpp

@@ -0,0 +1,51 @@
+
+#include <bits/ensure.h>
+#include <errno.h>
+#include <limits.h>
+#include <sys/sem.h>
+
+#include <mlibc/posix-sysdeps.hpp>
+
+int semget(key_t key, int n, int fl) {
+	if(n > USHRT_MAX) {
+		errno = EINVAL;
+		return -1;
+	}
+
+	int id = 0;
+	auto sysdep = MLIBC_CHECK_OR_ENOSYS(mlibc::sys_semget, -1);
+	if(int e = sysdep(key, n, fl, &id); e) {
+		errno = e;
+		return -1;
+	}
+	return id;
+}
+
+int semop(int, struct sembuf *, size_t) {
+	__ensure(!"Not implemented");
+	__builtin_unreachable();
+}
+
+union semun {
+	int val;
+	struct semid_ds *buf;
+	unsigned short *array;
+};
+
+int semctl(int id, int num, int cmd, ...) {
+	union semun semun;
+	int ret = 0;
+
+	va_list ap;
+	va_start(ap, cmd);
+	semun = va_arg(ap, union semun);
+	va_end(ap);
+
+	auto sysdep = MLIBC_CHECK_OR_ENOSYS(mlibc::sys_semctl, -1);
+	if(int e = sysdep(id, num, cmd, semun.buf, &ret); e) {
+		errno = e;
+		return -1;
+	}
+
+	return ret;
+}