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socket_library.md

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socket library

We are going to write a socket library as an exercise to what we have learnt in the socket programming.

The socket library has the following API.

The below are the error numbers to return by the APIs that we are about to write.

typedef enum {
    TCP_SOCK_OPEN_SUCCESS = 0,
    TCP_SOCK_OPEN_ERROR_INVAL_PROTO,
    TCP_SOCK_BIND_ERROR_SERVER_ALREADY_BOUND,
    TCP_SOCK_BIND_ERROR_INVAL_AF,
    TCP_SOCK_CONN_ERROR_INVAL_CONN,
    TCP_SOCK_ACCEPT_ERROR_INVAL_CLIENT,
    TCP_SOCK_SEND_ERROR_SOCK_CLOSED,
    TCP_SOCK_SEND_ERROR_SOCK_INVAL,
    UDP_SOCK_OPEN_ERROR_INVAL_PROTO,
    UDP_SOCK_BIND_ERROR_SERVER_ALREADY_BOUND,
    UDP_SOCK_BIND_ERROR_INVAL_AF,
    UDP_SOCK_CONN_ERROR_INVAL_CONN,
    UDP_SOCK_SEND_ERROR_SOCK_CLOSED,
    UDP_SOCK_SEND_ERROR_SOCK_INVAL,
} socketlib_ret_t;

// default connections to the listen function
#define SOCKET_LIB_MAX_CONN 100

1. tcp_socket_create_client(char *ip_port);
2. tcp_socket_create_server(char *ip_port, tcp_socket_accept_conn_cb *);
3. tcp_socket_destroy(int sock);
4. tcp_socket_accept_conn_cb(int sock, struct sockaddr *remote, socklen_t *remote_len);
5. tcp_socket_send(int sock, void *buf, int len, int opts);
6. tcp_socket_recv(int sock, void *buf, int len, int opts);
7. udp_socket_create_client(char *ip_port, char *to_send_ip_port);
8. udp_socket_create_server(char *ip_port, udp_socket_accept_conn_cb *);
9. udp_socket_destroy(int sock);
10. udp_socket_send(int sock, void *buf, int len, int opts);
11. udp_socket_recv(int sock, void *buf, int len, int opts);
12. udp_socket_sendto(int sock, void *buf, int len, int opts, struct sockaddr *addr, socklen_t len);
13. udp_socket_recvfrom(int sock, void *buf, int len, int opts, struct sockaddr *addr, socklen_t *len);
14. socklib_select(int sock, fd_set *rdfds, struct timeval *timeout);