selftests: mptcp: sockopt: rename pipefd to ipcfd

Rename pipefd to ipcfd to better reflect its generalized purpose since
it now handles both pipes and Unix domain sockets. This naming improves
code clarity for IPC channel handling.

Signed-off-by: Geliang Tang <[email protected]>

Author: Geliang Tang

tools/testing/selftests/net/mptcp/mptcp_sockopt.c

@@ -722,7 +722,7 @@ static int xaccept(int s)
 	return fd;
 }
 
-static int server(int pipefd)
+static int server(int ipcfd)
 {
 	int fd = -1, r;
 
@@ -738,13 +738,13 @@ static int server(int pipefd)
 		break;
 	}
 
-	r = write(pipefd, "conn", 4);
+	r = write(ipcfd, "conn", 4);
 	assert(r == 4);
 
 	alarm(15);
 	r = xaccept(fd);
 
-	process_one_client(r, pipefd);
+	process_one_client(r, ipcfd);
 
 	return 0;
 }
@@ -787,7 +787,7 @@ static void test_ip_tos_sockopt(int fd)
 		xerror("expect socklen_t == -1");
 }
 
-static int client(int pipefd)
+static int client(int ipcfd)
 {
 	int fd = -1;
 
@@ -806,7 +806,7 @@ static int client(int pipefd)
 
 	test_ip_tos_sockopt(fd);
 
-	connect_one_server(fd, pipefd);
+	connect_one_server(fd, ipcfd);
 
 	return 0;
 }
@@ -853,31 +853,32 @@ int main(int argc, char *argv[])
 {
 	int e1, e2, wstatus;
 	pid_t s, c, ret;
-	int pipefds[2];
+	int ipcfds[2];
 
 	parse_opts(argc, argv);
 
 	init_rng();
 
-	e1 = pipe(pipefds);
+	e1 = inq ? socketpair(AF_UNIX, SOCK_DGRAM, 0, ipcfds) :
+		   pipe(ipcfds);
 	if (e1 < 0)
 		die_perror("pipe");
 
 	s = xfork();
 	if (s == 0)
-		return server(pipefds[1]);
+		return server(ipcfds[1]);
 
-	close(pipefds[1]);
+	close(ipcfds[1]);
 
 	/* wait until server bound a socket */
-	e1 = read(pipefds[0], &e1, 4);
+	e1 = read(ipcfds[0], &e1, 4);
 	assert(e1 == 4);
 
 	c = xfork();
 	if (c == 0)
-		return client(pipefds[0]);
+		return client(ipcfds[0]);
 
-	close(pipefds[0]);
+	close(ipcfds[0]);
 
 	ret = waitpid(s, &wstatus, 0);
 	if (ret == -1)