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| TCP_CONNECT(3) | libdill Library Functions | TCP_CONNECT(3) |
NAME
tcp_connect - creates a connection to remote TCP endpointSYNOPSIS
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#include <libdill.h> int tcp_connect( const struct ipaddr* addr, 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.
addr: IP address to connect to.
deadline: A point in time when the operation should time out, in milliseconds. Use the now function to get your current point in time. 0 means immediate timeout, i.e., perform the operation if possible or return 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 --disable-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 below.ERRORS
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- ECANCELED: Current coroutine was canceled.
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- ECONNREFUSED: The target address was not listening for connections or refused the connection request.
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- ECONNRESET: Remote host reset the connection request.
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- EHOSTUNREACH: The destination host cannot be reached.
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- EINVAL: Invalid argument.
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- EMFILE: The maximum number of file descriptors in the process are already open.
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- ENETDOWN: The local network interface used to reach the destination is down.
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- ENETUNREACH: No route to the network is present.
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- ENFILE: The maximum number of file descriptors in the system are already open.
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- ENOMEM: Not enough memory.
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- ETIMEDOUT: Deadline was reached.
EXAMPLE
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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_mem(3) tcp_done(3) tcp_fromfd(3) tcp_fromfd_mem(3) tcp_listen(3) tcp_listen_mem(3) tcp_listener_fromfd(3) tcp_listener_fromfd_mem(3)| libdill |
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