libdill: Structured Concurrency for C


crlf_detach - terminates CRLF protocol and returns the underlying socket


#include <libdill.h>

int crlf_detach(
    int s,
    int64_t deadline);


CRLF is a message-based protocol that delimits messages usign CR+LF byte sequence (0x0D 0x0A). In other words, it's a protocol to send text messages separated by newlines. The protocol has no initial handshake. Terminal handshake is accomplished by each peer sending an empty line.

This function does the terminal handshake and returns underlying socket to the user. The socket is closed even in the case of error.

s: Handle of the CRLF socket.

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.

This function is not available if libdill is compiled with --disable-sockets option.


In case of success the function returns underlying socket handle. In case of error it returns -1 and sets errno to one of the values below.



int s = tcp_connect(&addr, -1);
s = crlf_attach(s);
msend(s, "ABC", 3, -1);
char buf[256];
ssize_t sz = mrecv(s, buf, sizeof(buf), -1);
s = crlf_detach(s, -1);


crlf_attach(3) crlf_attach_mem(3) mrecv(3) mrecvl(3) msend(3) msendl(3) now(3)