#ifndef FD_UTILS_H_
#define FD_UTILS_H_
#ifdef __cplusplus
extern "C" {
#endif
// inspect errno if any of these fails

/**
* set the file descriptor to non-blocking
* @param fd file descriptor
* @return 0 on success -1 on failure
*/
int uc_set_nonblocking(int fd);

/**
* set the file descriptor to blocking
* @param fd file descriptor
* @return 0 on success -1 on failure
*/
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 uc_set_reuseaddr(int sockfd);

/**
* enable TCP keepalive on the socket
* @param fd file descriptor
* @return 0 on success -1 on failure
*/
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 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 uc_set_receive_timeout(int sockfd,long timeoutms);

/*
* Set the IP DSCP (differnetiated services code point) header value
* The dscp must be < 64
* @param fd file descriptor
* @return 0 on success -1 on failure
*/
int uc_set_ip_dscp(int fd, unsigned int dscp);


#ifdef __cplusplus
};
#endif
#endif /* FD_UTILS_H_ */