linux-kernel - [PATCH liburing v1 05/12] t/socket-rw-offset: Don't brute force the port number

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Date:   Fri,  2 Sep 2022 07:59:39 +0700
From:   Ammar Faizi <ammarfaizi2@...weeb.org>
To:     Jens Axboe <axboe@...nel.dk>
Cc:     Ammar Faizi <ammarfaizi2@...weeb.org>,
        Dylan Yudaken <dylany@...com>,
        Facebook Kernel Team <kernel-team@...com>,
        Pavel Begunkov <asml.silence@...il.com>,
        Kanna Scarlet <knscarlet@...weeb.org>,
        Muhammad Rizki <kiizuha@...weeb.org>,
        GNU/Weeb Mailing List <gwml@...r.gnuweeb.org>,
        io-uring Mailing List <io-uring@...r.gnuweeb.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: [PATCH liburing v1 05/12] t/socket-rw-offset: Don't brute force the port number

From: Ammar Faizi <ammarfaizi2@...weeb.org>

Don't brute force the port number, use `t_bind_ephemeral_port()`,
much simpler and reliable for choosing a port number that is not
in use.

Cc: Dylan Yudaken <dylany@...com>
Cc: Facebook Kernel Team <kernel-team@...com>
Cc: Pavel Begunkov <asml.silence@...il.com>
Signed-off-by: Ammar Faizi <ammarfaizi2@...weeb.org>
---
 test/socket-rw-offset.c | 13 ++-----------
 1 file changed, 2 insertions(+), 11 deletions(-)

diff --git a/test/socket-rw-offset.c b/test/socket-rw-offset.c
index 987b6c9..c422442 100644
--- a/test/socket-rw-offset.c
+++ b/test/socket-rw-offset.c
@@ -10,60 +10,51 @@
 #include <stdint.h>
 #include <assert.h>
 
 #include <errno.h>
 #include <fcntl.h>
 #include <unistd.h>
 #include <sys/socket.h>
 #include <sys/un.h>
 #include <netinet/tcp.h>
 #include <netinet/in.h>
 #include <arpa/inet.h>
 
 #include "liburing.h"
+#include "helpers.h"
 
 int main(int argc, char *argv[])
 {
 	int p_fd[2], ret;
 	int32_t recv_s0;
 	int32_t val = 1;
 	struct sockaddr_in addr;
 	struct iovec iov_r[1], iov_w[1];
 
 	if (argc > 1)
 		return 0;
 
 	srand(getpid());
 
 	recv_s0 = socket(AF_INET, SOCK_STREAM | SOCK_CLOEXEC, IPPROTO_TCP);
 
 	ret = setsockopt(recv_s0, SOL_SOCKET, SO_REUSEPORT, &val, sizeof(val));
 	assert(ret != -1);
 	ret = setsockopt(recv_s0, SOL_SOCKET, SO_REUSEADDR, &val, sizeof(val));
 	assert(ret != -1);
 
 	addr.sin_family = AF_INET;
 	addr.sin_addr.s_addr = inet_addr("127.0.0.1");
-
-	do {
-		addr.sin_port = htons((rand() % 61440) + 4096);
-		ret = bind(recv_s0, (struct sockaddr*)&addr, sizeof(addr));
-		if (!ret)
-			break;
-		if (errno != EADDRINUSE) {
-			perror("bind");
-			exit(1);
-		}
-	} while (1);
+	assert(!t_bind_ephemeral_port(recv_s0, &addr));
 	ret = listen(recv_s0, 128);
 	assert(ret != -1);
 
 
 	p_fd[1] = socket(AF_INET, SOCK_STREAM | SOCK_CLOEXEC, IPPROTO_TCP);
 
 	val = 1;
 	ret = setsockopt(p_fd[1], IPPROTO_TCP, TCP_NODELAY, &val, sizeof(val));
 	assert(ret != -1);
 
 	int32_t flags = fcntl(p_fd[1], F_GETFL, 0);
 	assert(flags != -1);
 
-- 
Ammar Faizi