tap, tcp, util: Add some missing SOCK_CLOEXEC flags

I have no idea why, but these are reported by clang-tidy (19.2.1) on
Alpine (x86) only:

/home/sbrivio/passt/tap.c:1139:38: error: 'socket' should use SOCK_CLOEXEC where possible [android-cloexec-socket,-warnings-as-errors]
 1139 |         int fd = socket(AF_UNIX, SOCK_STREAM, 0);
      |                                             ^
      |                                              | SOCK_CLOEXEC
/home/sbrivio/passt/tap.c:1158:51: error: 'socket' should use SOCK_CLOEXEC where possible [android-cloexec-socket,-warnings-as-errors]
 1158 |                 ex = socket(AF_UNIX, SOCK_STREAM | SOCK_NONBLOCK, 0);
      |                                                                 ^
      |                                                                  | SOCK_CLOEXEC
/home/sbrivio/passt/tcp.c:1413:44: error: 'socket' should use SOCK_CLOEXEC where possible [android-cloexec-socket,-warnings-as-errors]
 1413 |         s = socket(af, SOCK_STREAM | SOCK_NONBLOCK, IPPROTO_TCP);
      |                                                   ^
      |                                                    | SOCK_CLOEXEC
/home/sbrivio/passt/util.c:188:38: error: 'socket' should use SOCK_CLOEXEC where possible [android-cloexec-socket,-warnings-as-errors]
  188 |         if ((s = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP)) < 0) {
      |                                             ^
      |                                              | SOCK_CLOEXEC

Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
Reviewed-by: David Gibson <david@gibson.dropbear.id.au>

1 files changed, 2 insertions, 1 deletions

diff --git a/util.c b/util.c
index dddef93..3448f30 100644
--- a/util.c
+++ b/util.c
@@ -183,7 +183,8 @@ void sock_probe_mem(struct ctx *c)
 	int v = INT_MAX / 2, s;
 	socklen_t sl;
 
-	if ((s = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP)) < 0) {
+	s = socket(AF_INET, SOCK_STREAM | SOCK_CLOEXEC, IPPROTO_TCP);
+	if (s < 0) {
 		c->low_wmem = c->low_rmem = 1;
 		return;
 	}