End a request quietly when the client has gone

A write that failed with EPIPE on an uncached page died into an error
page, which died again at exit when the page could not be sent either,
and git logged a recursion warning on every dropped connection. A
filter that exits early fails a write the same way, so the quiet exit
is kept for writes that reach the client itself.

1 file changed, 5 insertions, 0 deletions

diff --git a/source/filter.c b/source/filter.c
index dd1eaf0..6e16537 100644
--- a/source/filter.c
+++ b/source/filter.c
@@ -450,6 +450,11 @@ void cgit_abort_filters(void)
 #endif
 }
 
+int cgit_filter_holds_stdout(void)
+{
+	return running_exec != NULL;
+}
+
 static const struct {
 	const char *prefix;
 	struct cgit_filter *(*create)(const char *cmd, int argument_count);