implement ff_socket_nonblock and use it in networking code

Originally committed as revision 8846 to svn://svn.ffmpeg.org/ffmpeg/trunk

ffserver.c

@@ -440,7 +440,7 @@ static int socket_open_listen(struct sockaddr_in *my_addr)
         closesocket(server_fd);
         return -1;
     }
-    fcntl(server_fd, F_SETFL, O_NONBLOCK);
+    ff_socket_nonblock(server_fd, 1);
 
     return server_fd;
 }
@@ -649,7 +649,7 @@ static void new_connection(int server_fd, int is_rtsp)
                 &len);
     if (fd < 0)
         return;
-    fcntl(fd, F_SETFL, O_NONBLOCK);
+    ff_socket_nonblock(fd, 1);
 
     /* XXX: should output a warning page when coming
        close to the connection limit */

libavformat/network.h

@@ -32,6 +32,8 @@
 #define ff_neterrno() errno
 #define FF_NETERROR(err) err
 
+int ff_socket_nonblock(int socket, int enable);
+
 #if !defined(HAVE_INET_ATON)
 /* in os_support.c */
 int inet_aton (const char * str, struct in_addr * add);

libavformat/os_support.c

@@ -114,6 +114,14 @@ int resolve_host(struct in_addr *sin_addr, const char *hostname)
     }
     return 0;
 }
+
+int ff_socket_nonblock(int socket, int enable)
+{
+   if (enable)
+      return fcntl(socket, F_SETFL, fcntl(socket, F_GETFL) | O_NONBLOCK);
+   else
+      return fcntl(socket, F_SETFL, fcntl(socket, F_GETFL) & ~O_NONBLOCK);
+}
 #endif /* CONFIG_NETWORK */
 
 #ifdef CONFIG_FFSERVER

libavformat/tcp.c

@@ -22,7 +22,6 @@
 #include <unistd.h>
 #include "network.h"
 #include <sys/time.h>
-#include <fcntl.h>
 
 typedef struct TCPContext {
     int fd;
@@ -62,7 +61,7 @@ static int tcp_open(URLContext *h, const char *uri, int flags)
     fd = socket(AF_INET, SOCK_STREAM, 0);
     if (fd < 0)
         goto fail;
-    fcntl(fd, F_SETFL, O_NONBLOCK);
+    ff_socket_nonblock(fd, 1);
 
  redo:
     ret = connect(fd, (struct sockaddr *)&dest_addr,