diff mercurial/commandserver.py @ 23036:19f5273c9f3e

cmdserver: include pid of server handling requests in hello message

Because unix-mode server forks child process per connection, client does not
know the pid of the server that will handle requests.  The pid is necessary
to interrupt hung process:

 1. client connects to socket server
 2. server accepts the connection, forks, and tells pid
 3. client requests "runcommand pull"
    .. hung ..
 4. client sends SIGINT to the (forked) server
 5. server returns from I/O wait

Note that getsockopt(SO_PEERCRED) of Linux cannot be used because the server
fork()s after accept().

--- a/mercurial/commandserver.py	Sat Oct 18 21:52:11 2014 +0900
+++ b/mercurial/commandserver.py	Sat Oct 18 12:24:50 2014 +0900
@@ -232,6 +232,8 @@
         hellomsg = 'capabilities: ' + ' '.join(sorted(self.capabilities))
         hellomsg += '\n'
         hellomsg += 'encoding: ' + encoding.encoding
+        hellomsg += '\n'
+        hellomsg += 'pid: %d' % os.getpid()
 
         # write the hello msg in -one- chunk
         self.cout.write(hellomsg)