selftests: net: tfo: Fix build warning

Fix

tfo.c: In function ‘run_server’:
tfo.c:84:9: warning: ignoring return value of ‘read’ declared with attribute ‘warn_unused_result’

by evaluating the return value from read() and displaying an error message
if it reports an error.

Fixes: c65b5bb2329e3 ("selftests: net: add passive TFO test binary")
Cc: David Wei <dw@davidwei.uk>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Link: https://patch.msgid.link/20251205171010.515236-14-linux@roeck-us.net
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

diff --git a/tools/testing/selftests/net/tfo.c b/tools/testing/selftests/net/tfo.c
index eb3cac5e583c9d714cb24142aa80149a614c10ed..8d82140f0f7679f7dd7fc522114418fb0e2d5f71 100644 (file)
--- a/tools/testing/selftests/net/tfo.c
+++ b/tools/testing/selftests/net/tfo.c
@@ -81,7 +81,8 @@ static void run_server(void)
        if (getsockopt(connfd, SOL_SOCKET, SO_INCOMING_NAPI_ID, &opt, &len) < 0)
                error(1, errno, "getsockopt(SO_INCOMING_NAPI_ID)");
 
-       read(connfd, buf, 64);
+       if (read(connfd, buf, 64) < 0)
+               perror("read()");
        fprintf(outfile, "%d\n", opt);
 
        fclose(outfile);