Handle SIGPIPE during TCP stream test teardown

tests/test_stream_service.c

@@ -2,6 +2,7 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
+#include <signal.h>
 
 #include <openssl/sha.h>
 
@@ -1019,6 +1020,10 @@ int main(void) {
     debug_set_category_level(DEBUG_CATEGORY_STREAM, DEBUG_LEVEL_DEBUG);
     debug_set_category_level(DEBUG_CATEGORY_MEMBER_SYNC, DEBUG_LEVEL_INFO);
     debug_set_category_level(DEBUG_CATEGORY_SYS, DEBUG_LEVEL_WARN);
+#ifdef SIGPIPE
+    CHECK(signal(SIGPIPE, SIG_IGN) != SIG_ERR);
+    DEBUG_INFO(DEBUG_CATEGORY_STREAM, "TCP stream test ignores SIGPIPE; closed socket errors are handled by transport");
+#endif
     test_member_format();
     size_t allocations = u_get_allocated_count();
     test_clock_init(100); utun_instance_set_tun_init_enabled(0);