(no version information, might be only in CVS)
php_stream_sock_open_unix -- Open a Unix domain socket and convert into a stream
Description
php_stream * 
php_stream_sock_open_unix ( const char * path, int pathlen, int persistent, struct timeval * timeout )
     php_stream_sock_open_unix() attempts to open the Unix domain socket
      specified by path.  pathlen specifies the
      length of path.
      If timeout is not NULL, it specifies a timeout period for the connection attempt.
      persistent indicates if the stream should be opened as a persistent
      stream. Generally speaking, this parameter will usually be 0.
     
注: 
       This function will not work under Windows, which does not implement Unix domain sockets.
       A possible exception to this rule is if your PHP binary was built using cygwin.  You are encouraged
       to consider this aspect of the portability of your extension before it's release.
      
注: 
       This function treats path in a binary safe manner, suitable for
       use on systems with an abstract namespace (such as Linux), where the first character
       of path is a NUL character.