user: implement mlibc as the libc, finally.

It's finally done..

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

user/include/mlibc/tests/linux/pthread_setname_np.c

@@ -0,0 +1,33 @@
+#ifndef _GNU_SOURCE
+#define _GNU_SOURCE
+#endif
+
+#include <assert.h>
+#include <errno.h>
+#include <string.h>
+#include <pthread.h>
+
+int main() {
+	int ret = pthread_setname_np(pthread_self(), "mlibc-test-123");
+	assert(!ret);
+
+	char buf[16];
+	ret = pthread_getname_np(pthread_self(), buf, 16);
+	assert(!ret);
+	assert(!strcmp("mlibc-test-123", buf));
+
+	ret = pthread_setname_np(pthread_self(), "mlibc-test-123-too-long");
+	assert(ret == ERANGE);
+
+	ret = pthread_getname_np(pthread_self(), buf, 1);
+	assert(ret == ERANGE);
+
+	ret = pthread_getname_np(pthread_self(), buf, 15);
+	assert(ret == ERANGE);
+
+	ret = pthread_getname_np(pthread_self(), buf, 16);
+	assert(!ret);
+	assert(!strcmp("mlibc-test-123", buf));
+
+	return 0;
+}