[PATCH] [gdbserver] Imply --once if connecting via stdio

[William Ferreira <wqferr@gmail.com>]

Currently, gdbserver hangs after stdin is closed while it tries to
write: "Remote side has terminated connection.  GDBserver will reopen
the connection." This hang disappears if --once is also given. Since
the stdin connection won't ever reopen if it's closed, it's safe to
assume --once is desired.

Bug: https://sourceware.org/bugzilla/show_bug.cgi?id=29796
---
 gdbserver/server.cc | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/gdbserver/server.cc b/gdbserver/server.cc
index 789af36d9a4..3ab7a1eed14 100644
--- a/gdbserver/server.cc
+++ b/gdbserver/server.cc
@@ -4204,6 +4204,10 @@ captured_main (int argc, char *argv[])
 	  /* "-" specifies a stdio connection and is a form of port
 	     specification.  */
 	  port = STDIO_CONNECTION_NAME;
+
+	  /* Implying --once here prevents a hang after stdin has been closed.  */
+	  run_once = true;
+
 	  next_arg++;
 	  break;
 	}
-- 
2.45.1