LOCK_EX not available on solaris about pwauth HOT 2 CLOSED

Ugh. Solaris seems to have manual pages claiming it has flock() but they lie.

Probably I should rewrite this using fcntl() which is probably more portable.

Probably the function would change to something like:

snooze(int seconds)
{
    int slfd;
    struct flock lock;
    lock.l_type= F_WRLCK;
    lock.l_whence= SEEK_SET;
    lock.l_start= 0;
    lock.l_len= 0;

    /* Lock the sleep-lock file to serialize our sleeps */

    if ((slfd= open(SLEEP_LOCK,O_CREAT|O_RDWR,0644)) >= 0)
        fcntl(slfd,F_SETLKW,&lock);

    sleep(seconds);

    /* Release sleep-lock file */
    /*lock.l_type= F_UNLCK; fcntl(slfd,F_SETLK,&lock);*/
    close(slfd);
}

But I haven't tested that at all.

Version 2.3.10 has been modified to use fcntl() locking instead of flock() 
locking. Since fcntl() is a POSIX standard, I believe it should be more 
portable and should work on Solaris.