Cache last used port in bind_any

This way we don't try to bind to ports we already checked

1 files changed, 10 insertions, 0 deletions

diff --git a/sockutil.c b/sockutil.c
index 05097b2..f13bcaf 100644
--- a/sockutil.c
+++ b/sockutil.c
@@ -49,8 +49,16 @@ getsockport(int sd)
 int
 bind_any(int minport)
 {
+	static int lastminport = 0;
+	static int nextport = 0;
 	int sd;
 	struct sockaddr_in addr;
+
+	if (minport == lastminport) {
+		minport = nextport;
+	} else {
+		lastminport = minport;
+	}
 	
 	sd = socket(AF_INET, SOCK_STREAM, 0);
 	if (sd == -1) return -1;
@@ -59,6 +67,8 @@ bind_any(int minport)
 	do {
 		addr.sin_port = htons(minport++);
 	} while (bind(sd, (struct sockaddr *)&addr, sizeof addr) != 0);
+	nextport = minport;
+
 	if (listen(sd, 0) == -1) {
 		syslog(LOG_WARNING, "listen error %d, %s", errno,
 				strerror(errno));