Add talk_to_socket handler

This handler talks directly to a daemon using a Unix SOCK_SEQPACKET socket,
allowing e.g. cookie handlers to be implemented without having to fork and
and execute an external program or script interpreter.

A little explanation of the functioning of talk_to_socket():

 1. We receive our argument as a string in the format of "HANDLER EXTRA_ARGS".
 2. Copy "HANDLER" into our Unix socket address structure and connect to that
    address (blocking). Error out if connection fails.
 3. Write "EXTRA_ARGS" to the socket. Error out if writing fails.
 4. Use poll() to wait for a response, timing out after 500ms of inactivity.
 5. Use ioctl(FIONREAD) to find out how long the pending datagram is.
 6. Allocate an appropriately sized buffer (len+1) and write a null at the
    end, so our output is always null-terminated no matter what.
 7. Read from socket into buffer. Error out if read fails.
 8. Close socket.

1 files changed, 3 insertions, 0 deletions

diff --git a/uzbl.h b/uzbl.h
index c9d81b2..4b0a98b 100644
--- a/uzbl.h
+++ b/uzbl.h
@@ -338,6 +338,9 @@ char*
 build_progressbar_ascii(int percent);
 
 void
+talk_to_socket(WebKitWebView *web_view, GArray *argv, GString *result);
+
+void
 spawn(WebKitWebView *web_view, GArray *argv, GString *result);
 
 void