libdill: Structured Concurrency for C


tcp_connect_mem - creates a connection to remote TCP endpoint


#include <libdill.h>

int tcp_connect_mem(
    const struct ipaddr* addr,
    struct tcp_storage* 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 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.


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, "", 80, 0, -1);
int s = tcp_connect(&addr, -1);
bsend(s, "ABC", 3, -1);
char buf[3];
brecv(s, buf, sizeof(buf), -1);


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_listener_fromfd(3) tcp_listener_fromfd_mem(3)