tcp_connect_mem - creates a connection to remote TCP endpoint
#include <libdill.h> int tcp_connect_mem( const struct ipaddr* addr, void* mem, int64_t deadline);
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 memory to store the newly created object. It must be at least TCP_SIZE bytes long and 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.
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.
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; brecv(s, buf, sizeof(buf), -1); tcp_close(s);
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_listen(3) tcp_listen_mem(3)