daemon: log errors if we could not use some sockets

Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/daemon.c b/daemon.c
index 4c8346d5a1fe1325de2dd335a4e61a2dad994211..3a348a79b3da190488cffcc85c966df75189970d 100644 (file)
--- a/daemon.c
+++ b/daemon.c
@@ -734,6 +734,29 @@ struct socketlist {
        size_t alloc;
 };
 
+static const char *ip2str(int family, struct sockaddr *sin, socklen_t len)
+{
+#ifdef NO_IPV6
+       static char ip[INET_ADDRSTRLEN];
+#else
+       static char ip[INET6_ADDRSTRLEN];
+#endif
+
+       switch (family) {
+#ifndef NO_IPV6
+       case AF_INET6:
+               inet_ntop(family, &((struct sockaddr_in6*)sin)->sin6_addr, ip, len);
+               break;
+#endif
+       case AF_INET:
+               inet_ntop(family, &((struct sockaddr_in*)sin)->sin_addr, ip, len);
+               break;
+       default:
+               strcpy(ip, "<unknown>");
+       }
+       return ip;
+}
+
 #ifndef NO_IPV6
 
 static int setup_named_sock(char *listen_addr, int listen_port, struct socketlist *socklist)
@@ -780,15 +803,22 @@ static int setup_named_sock(char *listen_addr, int listen_port, struct socketlis
 #endif
 
                if (set_reuse_addr(sockfd)) {
+                       logerror("Could not set SO_REUSEADDR: %s", strerror(errno));
                        close(sockfd);
                        continue;
                }
 
                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),
+                                strerror(errno));
                        close(sockfd);
                        continue;       /* not fatal */
                }
                if (listen(sockfd, 5) < 0) {
+                       logerror("Could not listen to %s: %s",
+                                ip2str(ai->ai_family, ai->ai_addr, ai->ai_addrlen),
+                                strerror(errno));
                        close(sockfd);
                        continue;       /* not fatal */
                }
@@ -835,16 +865,23 @@ static int setup_named_sock(char *listen_addr, int listen_port, struct socketlis
                return 0;
 
        if (set_reuse_addr(sockfd)) {
+               logerror("Could not set SO_REUSEADDR: %s", strerror(errno));
                close(sockfd);
                return 0;
        }
 
        if ( bind(sockfd, (struct sockaddr *)&sin, sizeof sin) < 0 ) {
+               logerror("Could not listen to %s: %s",
+                        ip2str(AF_INET, (struct sockaddr *)&sin, sizeof(sin)),
+                        strerror(errno));
                close(sockfd);
                return 0;
        }
 
        if (listen(sockfd, 5) < 0) {
+               logerror("Could not listen to %s: %s",
+                        ip2str(AF_INET, (struct sockaddr *)&sin, sizeof(sin)),
+                        strerror(errno));
                close(sockfd);
                return 0;
        }