libdill: Structured Concurrency for C


pfx_detach - terminates PFX protocol and returns the underlying socket


#include <libdill.h>

int pfx_detach(
    int s,
    int64_t deadline);


PFX is a message-based protocol to send binary messages prefixed by 8-byte size in network byte order. The protocol has no initial handshake. Terminal handshake is accomplished by each peer sending eight 0xFF bytes.

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 PFX 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 = pfx_attach(s);
msend(s, "ABC", 3, -1);
char buf[256];
ssize_t sz = mrecv(s, buf, sizeof(buf), -1);
s = pfx_detach(s, -1);


mrecv(3) mrecvl(3) msend(3) msendl(3) now(3) pfx_attach(3) pfx_attach_mem(3)