pkt-line: add packet_flush_gently()

packet_flush() would die in case of a write error even though for some
callers an error would be acceptable. Add packet_flush_gently() which
writes a pkt-line flush packet like packet_flush() but does not die in
case of an error. The function is used in a subsequent patch.

Signed-off-by: Lars Schneider <larsxschneider@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

1 files changed, 8 insertions, 0 deletions

diff --git a/pkt-line.c b/pkt-line.c
index 3288ff0..62b89db 100644
--- a/pkt-line.c
+++ b/pkt-line.c
@@ -91,6 +91,14 @@ void packet_flush(int fd)
 	write_or_die(fd, "0000", 4);
 }
 
+int packet_flush_gently(int fd)
+{
+	packet_trace("0000", 4, 1);
+	if (write_in_full(fd, "0000", 4) == 4)
+		return 0;
+	return error("flush packet write failed");
+}
+
 void packet_buf_flush(struct strbuf *buf)
 {
 	packet_trace("0000", 4, 1);