Function getlock

sys/unix/unixunix.c:102–259

}

void
getlock(void)
{
#ifndef SELF_RECOVER
    static const char destroy_old_game_prompt[] =
    "There is already a game in progress under your name.  Destroy old game?";
#endif
    int i = 0, fd, c, too_old;
    const char *fq_lock;

#ifdef TTY_GRAPHICS
    /* idea from rpick%ucqais@uccba.uc.edu
     * prevent automated rerolling of characters
     * test input (fd0) so that tee'ing output to get a screen dump still
     * works
     * also incidentally prevents development of any hack-o-matic programs
     */
    /* added check for window-system type -dlc */
    if (!strcmp(windowprocs.name, "tty"))
        if (!isatty(0))
            error("You must play from a terminal.");
#endif

    /* we ignore QUIT and INT at this point */
    if (!lock_file(HLOCK, LOCKPREFIX, 10)) {
        wait_synch();
        error("%s", "");
    }

    /* default value of gl.lock[] is "1lock" where '1' gets changed to
       'a','b',&c below; override the default and use <uid><charname>
       if we aren't restricting the number of simultaneous games */
    if (!gl.locknum)
        Sprintf(gl.lock, "%u%s", (unsigned) getuid(), svp.plname);

    regularize(gl.lock);
    set_levelfile_name(gl.lock, 0);

    if (gl.locknum) {
        if (gl.locknum > 25)
            gl.locknum = 25;

        do {
            gl.lock[0] = 'a' + i++;
            fq_lock = fqname(gl.lock, LEVELPREFIX, 0);

            if ((fd = open(fq_lock, 0)) == -1) {
                if (errno == ENOENT)
                    goto gotlock; /* no such file */
                perror(fq_lock);
                unlock_file(HLOCK);
                error("Cannot open %s", fq_lock);
            }

            /* veryold() no longer conditionally closes fd */
            too_old = veryold(fd);
            (void) close(fd);
            if (too_old && eraseoldlocks())