[PATCH v7 04/10] 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 | 9 +++++++++
 pkt-line.h | 1 +
 2 files changed, 10 insertions(+)

diff --git a/pkt-line.c b/pkt-line.c
index 3824d05..37345ca 100644
--- a/pkt-line.c
+++ b/pkt-line.c
@@ -91,6 +91,15 @@ 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;
+	error("flush packet write failed");
+	return -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)));
 
 /*
-- 
2.10.0