Libraries

Libevent - event notifications on file descriptors

The event API provides a mechanism to execute a function when
a specific event on a file descriptor occurs or after at a given
time has passed.

Service setup example:
socketpair(AF_UNIX, SOCK_STREAM, 0, pair);
close(pair[1]);
con->pfd = pair[0];
event_set(&con->pread, con->pfd, EV_READ, cmd_read, con);
event_set(&con->pwrite, con->pfd, EV_WRITE, cmd_write, con);
event_add(&con->pread, NULL);

void
cmd_read(int fd, short which, void *arg)
{
   struct tcp_con *con = arg;
[...]
   tcp_senddata(con, TH_ACK);
 again:
   cmd_trigger_read(con);
}