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

src/fd_utils.c

@@ -2,11 +2,12 @@
 #include <fcntl.h>
 #include <errno.h>
 #include <netinet/in.h>
+#include <netinet/tcp.h>
 #include <sys/socket.h>
 #include <sys/types.h>
 #include "ucore/fd_utils.h"
 
-int set_nonblocking(int fd)
+int uc_set_nonblocking(int fd)
 {
     int flags = fcntl(fd,F_GETFL,NULL);
     if(flags < 0 ) {
@@ -15,7 +16,7 @@ int set_nonblocking(int fd)
     return fcntl(fd,F_SETFL,flags | O_NONBLOCK);
 }
 
-int set_blocking(int fd)
+int uc_set_blocking(int fd)
 {
     int flags = fcntl(fd,F_GETFL,NULL);
     if(flags < 0 ) {
@@ -25,35 +26,66 @@ int set_blocking(int fd)
     return fcntl(fd,F_SETFL,flags&~O_NONBLOCK);
 }
 
-int set_reuseaddr(int sockfd)
+int uc_set_reuseaddr(int sockfd)
 {
     int opt = 1;
     return setsockopt(sockfd, SOL_SOCKET, SO_REUSEADDR, (char *)&opt, sizeof(opt));
 
 }
 
-int set_tcp_keepalive(int sockfd)
+int uc_set_tcp_keepalive(int sockfd)
 {
     int optval = 1;
+
     return setsockopt(sockfd, SOL_SOCKET, SO_KEEPALIVE, &optval, sizeof(optval));
 }
 
+int uc_set_tcp_keepalive_cfg(int sockfd, const struct UCKeepConfig *cfg)
+{
+    int rc;
 
-int set_send_timeout(int sockfd,long timeoutms)
+    //first turn on keepalive
+    rc = uc_set_tcp_keepalive(sockfd);
+    if (rc != 0) {
+        return rc;
+    }
+
+    //set the keepalive options
+
+    rc = setsockopt(sockfd, SOL_TCP, TCP_KEEPCNT, &cfg->keepcnt, sizeof cfg->keepcnt);
+    if (rc != 0) {
+        return rc;
+    }
+
+    rc = setsockopt(sockfd, SOL_TCP, TCP_KEEPCNT, &cfg->keepidle, sizeof cfg->keepintvl);
+    if (rc != 0) {
+        return rc;
+    }
+
+    rc = setsockopt(sockfd, SOL_TCP, TCP_KEEPCNT, &cfg->keepintvl, sizeof cfg->keepintvl);
+    if (rc != 0) {
+        return rc;
+    }
+
+    return 0;
+}
+
+
+int uc_set_send_timeout(int sockfd,long timeoutms)
 {
     struct timeval so_sndtimeo = {timeoutms/1000,(timeoutms%1000)*1000};
 
     return setsockopt(sockfd, SOL_SOCKET, SO_SNDTIMEO, &so_sndtimeo, sizeof(so_sndtimeo));
 }
 
-int set_receive_timeout(int sockfd,long timeoutms)
+int uc_set_receive_timeout(int sockfd,long timeoutms)
 {
     struct timeval so_sndtimeo = {timeoutms/1000,(timeoutms%1000)*1000};
 
     return setsockopt(sockfd, SOL_SOCKET, SO_RCVTIMEO, &so_sndtimeo, sizeof(so_sndtimeo));
 }
-int
-set_ip_dscp(int fd, unsigned int dscp) {
+
+int uc_set_ip_dscp(int fd, unsigned int dscp) {
     int val;
 
     if (dscp > 63) {