tools/regression/pipe/pipe-overcommit2.c

   1 /*-
   2  * Copyright (C) 2005 Michael J. Silbersack <silby@freebsd.org>
   3  *  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice(s), this list of conditions and the following disclaimer as
  10  *    the first lines of this file unmodified other than the possible
  11  *    addition of one or more copyright notices.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice(s), this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  *
  16  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER(S) ``AS IS'' AND ANY
  17  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
  18  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  19  * DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) BE LIABLE FOR ANY
  20  * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
  21  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
  22  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
  23  * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
  26  * DAMAGE.
  27  */
  28
  29 #include <stdio.h>
  30 #include <stdlib.h>
  31 #include <fcntl.h>
  32
  33 /*
  34  * $FreeBSD$
  35  * This program tests how sys_pipe.c handles the case where there
  36  * is ample memory to allocate a pipe, but the file descriptor
  37  * limit for that user has been exceeded.
  38  */
  39
  40 int main (int argc, void *argv[])
  41
  42 {
  43         int i, returnval, lastfd;
  44         int pipes[10000];
  45
  46         for (i = 0; i < 100000; i++) {
  47                 returnval = open(argv[0], O_RDONLY);
  48                 if (returnval < 1)
  49                         break; /* All descriptors exhausted. */
  50                 else
  51                         lastfd = returnval;
  52         }
  53
  54         /* First falloc failure case in sys_pipe.c:pipe() */
  55         for (i = 0; i < 1000; i++) {
  56                 returnval = pipe(&pipes[i]);
  57         }
  58
  59         /*
  60          * Free just one FD so that the second falloc failure
  61          * case will occur.
  62          */
  63         close(lastfd);
  64
  65         for (i = 0; i < 1000; i++) {
  66                 returnval = pipe(&pipes[i]);
  67         }
  68         printf("PASS\n");
  69 }