gdbserver regtest: add return value to sleepers select error message

This is failing on FreeBSD 15 (looks like an OS or libc regression).
Improve the error message to make the problem clearer. errno is 0
but select is returning 93 (from a set of 0 fds!).

diff --git a/gdbserver_tests/sleepers.c b/gdbserver_tests/sleepers.c
index b433c19847afa3abecd1282c6f03ed54b87c9763..51d197a8e7466d717f4b1760beb613cc48a928b0 100644 (file)
--- a/gdbserver_tests/sleepers.c
+++ b/gdbserver_tests/sleepers.c
@@ -84,8 +84,11 @@ static void *sleeper_or_burner(void *v)
          t[s->t].tv_usec = (sleepms % 1000) * 1000;
          ret = select (0, NULL, NULL, NULL, &t[s->t]);
          /* We only expect a timeout result or EINTR from the above. */
-         if (ret != 0 && errno != EINTR)
-            perror("unexpected result from select");
+         if (ret != 0 && errno != EINTR) {
+            char buf[64];
+            snprintf(buf, 64, "unexpected result (%d) from select", ret);
+            perror(buf);
+         }
       }
       if (burn > 0 && s->burn)
          do_burn();