NAME

SYNOPSIS

#include <libdill.h>
int tcp_connect_mem(
    const struct ipaddr* addr,
    struct tcp_storage* mem,
    int64_t deadline);

    

DESCRIPTION

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 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

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 already 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 already 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