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TCP_CONNECT_MEM(3) libdill Library Functions TCP_CONNECT_MEM(3) NAME tcp_connect_mem - creates a connection to remote TCP endpoint SYNOPSIS #include <libdill.h> int tcp_connect_mem( const struct ipaddr* addr, struct tcp_storage* mem, int64_t deadline); DESCRIPTION TCP protocol is a reliable bytestream protocol for transporting data over network. It is defined in RFC 793. This function creates a connection to a remote TCP endpoint. This function allows to avoid one dynamic memory allocation by storing the object in user-supplied memory. Unless you are hyper-optimizing use tcp_connect instead. addr: IP address to connect to. mem: The structure to store the newly created object in. It must not be deallocated before the object is closed. deadline: A point in time when the operation should time out, in mil- liseconds. Use the now function to get your current point in time. 0 means immediate timeout, i.e., perform the operation if possible or re- turn without blocking if not. -1 means no deadline, i.e., the call will block forever if the operation cannot be performed. The socket can be cleanly shut down using tcp_close function. This function is not available if libdill is compiled with --dis- able-sockets option. RETURN VALUE In case of success the function returns newly created socket handle. In case of error it returns -1 and sets errno to one of the values be- low. ERRORS • ECANCELED: Current coroutine was canceled. • ECONNREFUSED: The target address was not listening for connections or refused the connection request. • ECONNRESET: Remote host reset the connection request. • EHOSTUNREACH: The destination host cannot be reached. • EINVAL: Invalid argument. • EMFILE: The maximum number of file descriptors in the process are al- ready open. • ENETDOWN: The local network interface used to reach the destination is down. • ENETUNREACH: No route to the network is present. • ENFILE: The maximum number of file descriptors in the system are al- ready open. • ENOMEM: Not enough memory. • ETIMEDOUT: Deadline was reached. EXAMPLE struct ipaddr addr; ipaddr_remote(&addr, "www.example.org", 80, 0, -1); int s = tcp_connect(&addr, -1); bsend(s, "ABC", 3, -1); char buf[3]; brecv(s, buf, sizeof(buf), -1); tcp_close(s); SEE ALSO brecv(3) brecvl(3) bsend(3) bsendl(3) hclose(3) now(3) tcp_accept(3) tcp_accept_mem(3) tcp_close(3) tcp_connect(3) tcp_done(3) tcp_fromfd(3) tcp_fromfd_mem(3) tcp_listen(3) tcp_listen_mem(3) tcp_listen- er_fromfd(3) tcp_listener_fromfd_mem(3) libdill TCP_CONNECT_MEM(3)
NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | EXAMPLE | SEE ALSO
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