user: implement mlibc as the libc, finally.

It's finally done..

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

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

@@ -0,0 +1,82 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <errno.h>
+#include <string.h>
+#include <unistd.h>
+#include <sys/xattr.h>
+
+#define assert_perror(x)            \
+	({                          \
+		int res = (x);      \
+		if (res < 0) {      \
+			perror(#x); \
+			return 1;   \
+		}                   \
+		res;                \
+	})
+
+#define soft_assert(x, m)                                                   \
+	({                                                                  \
+		if (!(x)) {                                                 \
+			fprintf(stderr, "cond \"%s\" failed: %s\n", #x, m); \
+			return 1;                                           \
+		}                                                           \
+	})
+
+void remove_tmp(const char (*fname)[]) {
+	unlink(&(*fname)[0]);
+}
+#define _cleanup_file_ __attribute__((cleanup(remove_tmp)))
+
+int main(void) {
+	int ret;
+	char buf[32] = { 0 };
+	_cleanup_file_ char filename[] = "xattr_test.XXXXXX";
+	_cleanup_file_ char filename2[] = "xattr_test.XXXXXX.2";
+
+	int tmpfile = assert_perror(mkstemp(filename));
+	memcpy(filename2, filename, sizeof(filename) - 1);
+	assert_perror(symlink(filename, filename2));
+
+	assert_perror(setxattr(filename, "user.T1", "ABC", 3, XATTR_CREATE));
+	assert_perror(fsetxattr(tmpfile, "user.T2", "DEF", 3, XATTR_CREATE));
+
+	// for testing remove
+	assert_perror(fsetxattr(tmpfile, "user.T3", "DEF", 3, XATTR_CREATE));
+
+	if ((ret = getxattr(filename, "user.T1", buf, 3)) != 3) {
+		if (ret < 0) {
+			perror("getxattr");
+			return 1;
+		}
+
+		soft_assert(memcmp(buf, "ABC", 3) == 0, "xattr read wrong");
+	}
+
+	ret = lgetxattr(filename2, "user.T1", buf, 3);
+	soft_assert(ret < 0 && errno == ENODATA, "lgetxattr deref'd");
+
+	if ((ret = fgetxattr(tmpfile, "user.T3", buf, 3)) != 3) {
+		if (ret < 0) {
+			perror("fgetxattr");
+			return 1;
+		}
+
+		soft_assert(memcmp(buf, "DEF", 3) == 0, "xattr read wrong");
+	}
+
+	assert_perror(removexattr(filename, "user.T2"));
+	assert_perror(fremovexattr(tmpfile, "user.T3"));
+
+	ret = assert_perror(listxattr(filename, buf, sizeof(buf) - 1));
+	soft_assert(memmem(buf, ret, "user.T1", 7), "user.T1 not found");
+	soft_assert(!memmem(buf, ret, "user.T2", 7), "user.T2 found");
+	soft_assert(!memmem(buf, ret, "user.T3", 7), "user.T3 found");
+
+	ret = assert_perror(flistxattr(tmpfile, buf, sizeof(buf) - 1));
+	soft_assert(memmem(buf, ret, "user.T1", 7), "user.T1 not found");
+	soft_assert(!memmem(buf, ret, "user.T2", 7), "user.T2 found");
+	soft_assert(!memmem(buf, ret, "user.T3", 7), "user.T3 found");
+
+	return 0;
+}