[PATCH v4 03/12] pkt-line: add packet_flush_gentle()

[larsxschneider@gmail.com]

From: Lars Schneider <larsxschneider@gmail.com>

packet_flush() would die in case of a write error even though for some callers
an error would be acceptable. Add packet_flush_gentle() which writes a pkt-line
flush packet and returns `0` for success and `1` for failure.

Signed-off-by: Lars Schneider <larsxschneider@gmail.com>
---
 pkt-line.c | 6 ++++++
 pkt-line.h | 1 +
 2 files changed, 7 insertions(+)

diff --git a/pkt-line.c b/pkt-line.c
index aa158ba..c8a052a 100644
--- a/pkt-line.c
+++ b/pkt-line.c
@@ -91,6 +91,12 @@ void packet_flush(int fd)
 	write_or_die(fd, "0000", 4);
 }
 
+int packet_flush_gently(int fd)
+{
+	packet_trace("0000", 4, 1);
+	return !write_or_whine_pipe(fd, "0000", 4, "flush packet");
+}
+
 void packet_buf_flush(struct strbuf *buf)
 {
 	packet_trace("0000", 4, 1);
diff --git a/pkt-line.h b/pkt-line.h
index ed64511..2fbaee9 100644
--- a/pkt-line.h
+++ b/pkt-line.h
@@ -23,6 +23,7 @@ void packet_flush(int fd);
 void packet_write(int fd, const char *fmt, ...) __attribute__((format (printf, 2, 3)));
 void packet_buf_flush(struct strbuf *buf);
 void packet_buf_write(struct strbuf *buf, const char *fmt, ...) __attribute__((format (printf, 2, 3)));
+int packet_flush_gently(int fd);
 int direct_packet_write(int fd, char *buf, size_t size, int gentle);
 int direct_packet_write_data(int fd, const char *data, size_t size, int gentle);
 
-- 
2.9.0