From 1a6b6b781c1b30ed6ff694d934c7dac4f975cf81 Mon Sep 17 00:00:00 2001
From: Ben Noordhuis <info@bnoordhuis.nl>
Date: Fri, 29 Jun 2012 18:43:44 +0200
Subject: [PATCH] unix: deduplicate socket creation code in tcp.c

Incidentally fixes a rather obscure bug where uv_tcp_connect() reconnected
and leaked a file descriptor when the handle was already busy connecting,
handle->fd was zero (unlikely) and uv_tcp_connect() got called again.
---
 src/unix/tcp.c | 85 ++++++++++++++++++--------------------------------
 1 file changed, 31 insertions(+), 54 deletions(-)

diff --git a/src/unix/tcp.c b/src/unix/tcp.c
index 223bb048..233be825 100644
--- a/src/unix/tcp.c
+++ b/src/unix/tcp.c
@@ -34,6 +34,26 @@ int uv_tcp_init(uv_loop_t* loop, uv_tcp_t* tcp) {
 }
 
 
+static int maybe_new_socket(uv_tcp_t* handle, int domain, int flags) {
+  int sockfd;
+
+  if (handle->fd != -1)
+    return 0;
+
+  sockfd = uv__socket(domain, SOCK_STREAM, 0);
+
+  if (sockfd == -1)
+    return uv__set_sys_error(handle->loop, errno);
+
+  if (uv__stream_open((uv_stream_t*)handle, sockfd, flags)) {
+    close(sockfd);
+    return -1;
+  }
+
+  return 0;
+}
+
+
 static int uv__bind(uv_tcp_t* tcp,
                     int domain,
                     struct sockaddr* addr,
@@ -44,23 +64,8 @@ static int uv__bind(uv_tcp_t* tcp,
   saved_errno = errno;
   status = -1;
 
-  if (tcp->fd < 0) {
-    if ((tcp->fd = uv__socket(domain, SOCK_STREAM, 0)) == -1) {
-      uv__set_sys_error(tcp->loop, errno);
-      goto out;
-    }
-
-    if (uv__stream_open((uv_stream_t*)tcp,
-                        tcp->fd,
-                        UV_STREAM_READABLE | UV_STREAM_WRITABLE)) {
-      close(tcp->fd);
-      tcp->fd = -1;
-      status = -2;
-      goto out;
-    }
-  }
-
-  assert(tcp->fd >= 0);
+  if (maybe_new_socket(tcp, domain, UV_STREAM_READABLE|UV_STREAM_WRITABLE))
+    return -1;
 
   tcp->delayed_error = 0;
   if (bind(tcp->fd, addr, addrsize) == -1) {
@@ -84,7 +89,6 @@ static int uv__connect(uv_connect_t* req,
                        struct sockaddr* addr,
                        socklen_t addrlen,
                        uv_connect_cb cb) {
-  int sockfd;
   int r;
 
   assert(handle->type == UV_TCP);
@@ -92,18 +96,10 @@ static int uv__connect(uv_connect_t* req,
   if (handle->connect_req)
     return uv__set_sys_error(handle->loop, EALREADY);
 
-  if (handle->fd <= 0) {
-    sockfd = uv__socket(addr->sa_family, SOCK_STREAM, 0);
-
-    if (sockfd == -1)
-      return uv__set_sys_error(handle->loop, errno);
-
-    if (uv__stream_open((uv_stream_t*)handle,
-                        sockfd,
-                        UV_STREAM_READABLE | UV_STREAM_WRITABLE)) {
-      close(sockfd);
-      return -1;
-    }
+  if (maybe_new_socket(handle,
+                       addr->sa_family,
+                       UV_STREAM_READABLE|UV_STREAM_WRITABLE)) {
+    return -1;
   }
 
   handle->delayed_error = 0;
@@ -231,33 +227,14 @@ out:
 
 
 int uv_tcp_listen(uv_tcp_t* tcp, int backlog, uv_connection_cb cb) {
-  int r;
+  if (tcp->delayed_error)
+    return uv__set_sys_error(tcp->loop, tcp->delayed_error);
 
-  if (tcp->delayed_error) {
-    uv__set_sys_error(tcp->loop, tcp->delayed_error);
+  if (maybe_new_socket(tcp, AF_INET, UV_STREAM_READABLE))
     return -1;
-  }
 
-  if (tcp->fd < 0) {
-    if ((tcp->fd = uv__socket(AF_INET, SOCK_STREAM, 0)) == -1) {
-      uv__set_sys_error(tcp->loop, errno);
-      return -1;
-    }
-
-    if (uv__stream_open((uv_stream_t*)tcp, tcp->fd, UV_STREAM_READABLE)) {
-      close(tcp->fd);
-      tcp->fd = -1;
-      return -1;
-    }
-  }
-
-  assert(tcp->fd >= 0);
-
-  r = listen(tcp->fd, backlog);
-  if (r < 0) {
-    uv__set_sys_error(tcp->loop, errno);
-    return -1;
-  }
+  if (listen(tcp->fd, backlog))
+    return uv__set_sys_error(tcp->loop, errno);
 
   tcp->connection_cb = cb;