While --init-timeout and --timeout options exist and I've never
run git-daemon without them, some users may forget to set them
and encounter hung daemon processes when connections fail.
Enable socket-level timeouts so the kernel can send keepalive
probes as necessary to detect failed connections.
Signed-off-by: Eric Wong <e@xxxxxxxxx>
---
daemon.c | 14 ++++++++++++++
1 file changed, 14 insertions(+)
diff --git a/daemon.c b/daemon.c
index 8d45c33..46dddac 100644
--- a/daemon.c
+++ b/daemon.c
@@ -669,6 +669,15 @@ static void hostinfo_clear(struct hostinfo *hi)
strbuf_release(&hi->tcp_port);
}
+static void set_keep_alive(int sockfd)
+{
+ int ka = 1;
+
+ if (setsockopt(sockfd, SOL_SOCKET, SO_KEEPALIVE, &ka, sizeof(ka)) < 0)
+ logerror("unable to set SO_KEEPALIVE on socket: %s",
+ strerror(errno));
+}
+
static int execute(void)
{
char *line = packet_buffer;
@@ -681,6 +690,7 @@ static int execute(void)
if (addr)
loginfo("Connection from %s:%s", addr, port);
+ set_keep_alive(0);
alarm(init_timeout ? init_timeout : timeout);
pktlen = packet_read(0, NULL, NULL, packet_buffer, sizeof(packet_buffer), 0);
alarm(0);
@@ -951,6 +961,8 @@ static int setup_named_sock(char *listen_addr, int listen_port, struct socketlis
continue;
}
+ set_keep_alive(sockfd);
+
if (bind(sockfd, ai->ai_addr, ai->ai_addrlen) < 0) {
logerror("Could not bind to %s: %s",
ip2str(ai->ai_family, ai->ai_addr, ai->ai_addrlen),
@@ -1010,6 +1022,8 @@ static int setup_named_sock(char *listen_addr, int listen_port, struct socketlis
return 0;
}
+ set_keep_alive(sockfd);
+
if ( bind(sockfd, (struct sockaddr *)&sin, sizeof sin) < 0 ) {
logerror("Could not bind to %s: %s",
ip2str(AF_INET, (struct sockaddr *)&sin, sizeof(sin)),
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