thread.c: return the error

* thread.c (rb_wait_for_single_fd): return the error when ppoll
  failed.  fix r51319.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@51330 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 1 insertions, 0 deletions

diff --git a/thread.c b/thread.c
index 45f0fa7355..48115d8ddc 100644
--- a/thread.c
+++ b/thread.c
@@ -3694,6 +3694,7 @@ rb_wait_for_single_fd(int fd, int events, struct timeval *tv)
 
 	RUBY_VM_CHECK_INTS_BLOCKING(th);
     } while (result < 0 && retryable(errno = lerrno) && poll_update());
+    if (result < 0) return -1;
 
     if (fds.revents & POLLNVAL) {
 	errno = EBADF;