[PATCH v6 04/13] pkt-line: add packet_flush_gently()

[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_gently() 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 3e8b2fb..cad26df 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_in_full(fd, "0000", 4) == 4 ? 0 : -1);
+}
+
 void packet_buf_flush(struct strbuf *buf)
 {
 	packet_trace("0000", 4, 1);
diff --git a/pkt-line.h b/pkt-line.h
index 3caea77..3fa0899 100644
--- a/pkt-line.h
+++ b/pkt-line.h
@@ -23,6 +23,7 @@ void packet_flush(int fd);
 void packet_write_fmt(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 packet_write_fmt_gently(int fd, const char *fmt, ...) __attribute__((format (printf, 2, 3)));
 
 /*
-- 
2.9.2