src/tests/make-page.c

   1 /*
   2  * Copyright (c) 2000 Kungliga Tekniska Högskolan
   3  * (Royal Institute of Technology, Stockholm, Sweden).
   4  * All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions
   8  * are met:
   9  *
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  *
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  *
  17  * 3. Neither the name of the Institute nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  */
  33
  34 #ifdef HAVE_CONFIG_H
  35 #include <config.h>
  36 #endif
  37
  38 #include <stdio.h>
  39 #include <stdlib.h>
  40 #include <string.h>
  41 #include <errno.h>
  42
  43 #include <sys/types.h>
  44 #include <sys/stat.h>
  45 #include <sys/mman.h>
  46 #include <sys/time.h>
  47 #include <unistd.h>
  48 #include <fcntl.h>
  49 #include <time.h>
  50
  51 #include <err.h>
  52
  53 #ifndef MAP_FAILED
  54 #define MAP_FAILED ((void *)-1)
  55 #endif
  56
  57 int
  58 main(int argc, char **argv)
  59 {
  60     int mb = 10;
  61     int ret;
  62     size_t sz;
  63     void *mmap_buf;
  64
  65     srand(getpid() * time(NULL));
  66
  67     sz = mb * 1024 * 1024;
  68
  69 #ifdef MAP_ANON
  70     mmap_buf =
  71         mmap(NULL, sz, PROT_READ | PROT_WRITE, MAP_ANON | MAP_PRIVATE, -1, 0);
  72 #else
  73     {
  74         int fd;
  75
  76         fd = open("/dev/zero", O_RDWR);
  77         if (fd < 0)
  78             err(1, "open /dev/zero");
  79         mmap_buf = mmap(NULL, sz, PROT_READ | PROT_WRITE, MAP_PRIVATE, fd, 0);
  80         close(fd);
  81     }
  82 #endif
  83     if (mmap_buf == (void *)MAP_FAILED)
  84         err(1, "mmap");
  85
  86     while (1) {
  87         int *foo =
  88             (int *)((unsigned char *)mmap_buf +
  89                     (((rand() % (sz - 9)) + 7) & ~7));
  90         struct timeval tv = { 0, 1000 };
  91         *foo = 10;
  92         select(0, NULL, NULL, NULL, &tv);
  93     }
  94
  95     ret = munmap(mmap_buf, sz);
  96     if (ret)
  97         err(1, "munmap");
  98 }