redirecting stderr failure on :ext: ssh and large data

[Frank Hemer]

I just discovered a bug with stderr redirection.
In case some app starts cvs as coprocess and has redirected stderr before:

dup2(STDOUT_FILENO,STDERR_FILENO);

cvs will lose data. This only applies to :ext: method with CVS_RSH set to ssh 
and a filesize of a few thousand lines (tested with diff --side-by-side).

Changing the following code in client.c/handle_m(args, len)  will fix this:

>>>>>>>>>>>>>>>>> old >>>>>>>>>>>>>>>>>>

    fflush (stderr);
    fwrite (args, len, sizeof (*args), stdout);
    putc ('\n', stdout);

<<<<<<<<<<<<<<<< new <<<<<<<<<<<<<<<<<<

    fflush (stderr);

    fd_set wfds;
    FD_ZERO(&wfds);
    FD_SET(STDOUT_FILENO, &wfds);
    int s = select(STDOUT_FILENO+1,NULL,&wfds,NULL,NULL);
    if (s < 1) {
       perror("cannot write to stdout");
    }

    fwrite (args, len, sizeof (*args), stdout);
    putc ('\n', stdout);

>>>>>>>>>>>>>>> end >>>>>>>>>>>>>>>>>>>

Frank