/*
  select-preload -- Ignore 1 second sleeps for cvs2svn.py performance
  Copyright (c) 2004 Roland Dreier
 
  Redistribution and use in source and binary forms, with or without
  modification, are permitted provided that the following conditions
  are met:
 
  1. Redistributions of source code must retain the above copyright
     notice, this list of conditions and the following disclaimer.

  2. Redistributions in binary form must reproduce the above copyright
     notice, this list of conditions and the following disclaimer in
     the documentation and/or other materials provided with the
     distribution.
 
  THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
  WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
  DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
  GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
  IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
  OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
  IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/

#define _GNU_SOURCE /* Get RTLD_NEXT */
#include <dlfcn.h>

#include <sys/time.h>
#include <sys/types.h>
#include <unistd.h>

#include <stdio.h>

int
select(int             n,
       fd_set         *readfds,
       fd_set         *writefds,
       fd_set         *exceptfds,
       struct timeval *timeout) {
    static int (*orig_select)(int, fd_set*, fd_set*, fd_set*, struct timeval*);

    if (!orig_select) {
        orig_select = dlsym(RTLD_NEXT, "select");
    }

    if (n                    ||
        readfds              ||
        writefds             ||
        exceptfds            ||
        timeout->tv_sec != 1 ||
        timeout->tv_usec) {
        return orig_select(n, readfds, writefds, exceptfds, timeout);
    } else {
        static int warned;

        if (!warned) {
            fprintf(stderr, "Ignoring 1-second select() sleep\n");
        }

        ++warned;
        return 0;
    }
}