user: implement mlibc as the libc, finally.

It's finally done..

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

user/include/mlibc/options/linux/generic/sys-mount.cpp

@@ -0,0 +1,29 @@
+
+#include <errno.h>
+#include <sys/mount.h>
+
+#include <bits/ensure.h>
+#include <mlibc/linux-sysdeps.hpp>
+
+int mount(const char *source, const char *target,
+		const char *fstype, unsigned long flags, const void *data) {
+	MLIBC_CHECK_OR_ENOSYS(mlibc::sys_mount, -1);
+	if(int e = mlibc::sys_mount(source, target, fstype, flags, data); e) {
+		errno = e;
+		return -1;
+	}
+	return 0;
+}
+
+int umount(const char *target) {
+	return umount2(target, 0);
+}
+
+int umount2(const char *target, int flags) {
+	MLIBC_CHECK_OR_ENOSYS(mlibc::sys_umount2, -1);
+	if(int e = mlibc::sys_umount2(target, flags); e) {
+		errno = e;
+		return -1;
+	}
+	return 0;
+}