Add uc_set_tcp_keepalive_cfg too set keepalive options

include/ucore/fd_utils.h

@@ -10,42 +10,66 @@ extern "C" {
 * @param fd file descriptor
 * @return 0 on success -1 on failure
 */
-int set_nonblocking(int fd);
+int uc_set_nonblocking(int fd);
 
 /**
 * set the file descriptor to blocking
 * @param fd file descriptor
 * @return 0 on success -1 on failure
 */
-int set_blocking(int fd);
+int uc_set_blocking(int fd);
 
 /**
 * set the socket file descriptor to SO_REUSEADDR
 * @param fd file descriptor
 * @return 0 on success -1 on failure
 */
-int set_reuseaddr(int sockfd);
+int uc_set_reuseaddr(int sockfd);
 
 /**
 * enable TCP keepalive on the socket
 * @param fd file descriptor
 * @return 0 on success -1 on failure
 */
-int set_tcp_keepalive(int sockfd);
+int uc_set_tcp_keepalive(int sockfd);
 
+
+struct UCKeepConfig {
+    /** The maximum number of keepalive probes TCP should 
+     * send before dropping the connection. (TCP_KEEPCNT socket option)
+     */
+    int keepcnt;
+    /** The time (in seconds) the connection needs to remain 
+     * idle before TCP starts sending keepalive probes (TCP_KEEPIDLE socket option)
+     */
+    int keepidle;
+    /** The time (in seconds) between individual keepalive probes.
+     *  (TCP_KEEPINTVL socket option)
+     */
+    int keepintvl;
+};
+
+/** Set the keepalive options on the socket
+* This also enables TCP keepalive on the socket
+*
+* @param fd file descriptor
+* @param fd file descriptor
+* @return 0 on success -1 on failure
+*/
+int uc_set_tcp_keepalive_cfg(int sockfd, const struct UCKeepConfig *cfg);
 /**
 * Set the socket send timeout, in miliseconds
 * @param fd file descriptor
 * @return 0 on success -1 on failure
 */
-int set_send_timeout(int sockfd,long timeoutms);
+int uc_set_send_timeout(int sockfd,long timeoutms);
 
 /**
 * Set the socket receive timeout, in miliseconds
 * @param fd file descriptor
 * @return 0 on success -1 on failure
 */
-int set_receive_timeout(int sockfd,long timeoutms);
+int uc_set_receive_timeout(int sockfd,long timeoutms);
 
 /*
 * Set the IP DSCP (differnetiated services code point) header value
@@ -53,7 +77,7 @@ int set_receive_timeout(int sockfd,long timeoutms);
 * @param fd file descriptor
 * @return 0 on success -1 on failure
 */
-int set_ip_dscp(int fd, unsigned int dscp);
+int uc_set_ip_dscp(int fd, unsigned int dscp);
 
 
 #ifdef __cplusplus