user: implement mlibc as the libc, finally.

It's finally done..

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

user/include/mlibc/tests/posix/access.c

@@ -0,0 +1,32 @@
+#include <unistd.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <assert.h>
+#include <fcntl.h>
+
+#ifdef USE_HOST_LIBC
+#define TEST_FILE "access-host-libc.tmp"
+#else
+#define TEST_FILE "access.tmp"
+#endif
+
+int main() {
+	// Make sure that it wasn't created by a previous test run
+	unlink(TEST_FILE);
+
+	assert(access(TEST_FILE, F_OK) == -1);
+	assert(access(TEST_FILE, W_OK) == -1);
+	assert(access(TEST_FILE, R_OK) == -1);
+	assert(access(TEST_FILE, X_OK) == -1);
+
+	close(open(TEST_FILE, O_CREAT | O_RDWR, 0666));
+
+	assert(access(TEST_FILE, F_OK) == 0);
+	assert(access(TEST_FILE, W_OK) == 0);
+	assert(access(TEST_FILE, R_OK) == 0);
+	assert(access(TEST_FILE, X_OK) == -1);
+
+	unlink(TEST_FILE);
+
+	return 0;
+}