Rename regression to test

test/apps/network/socketpair.c

@@ -0,0 +1,41 @@
+// SPDX-License-Identifier: MPL-2.0
+
+#include <stdio.h>
+#include <sys/socket.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#define MESG1 "Hello from child"
+#define MESG2 "Hello from parent"
+
+int main()
+{
+	int sockets[2], child;
+	char buf[1024];
+	if (socketpair(AF_UNIX, SOCK_STREAM, 0, sockets) < 0) {
+		perror("create socket pair");
+		exit(1);
+	}
+	if ((child = fork()) == -1)
+		perror("fork");
+	else if (child) {
+		// parent
+		close(sockets[0]);
+		if (read(sockets[1], buf, 1024) < 0)
+			perror("read from child");
+		printf("Receive from child: %s\n", buf);
+		if (write(sockets[1], MESG2, sizeof(MESG2)) < 0)
+			perror("write to child");
+		close(sockets[1]);
+	} else {
+		// child
+		close(sockets[1]);
+		if (write(sockets[0], MESG1, sizeof(MESG1)) < 0)
+			perror("write to parent");
+		if (read(sockets[0], buf, 1024) < 0)
+			perror("read from parent");
+		printf("Receive from parent: %s\n", buf);
+		close(sockets[0]);
+	}
+	return 0;
+}