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/*
* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
* All rights reserved.
*
* 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 COPYRIGHT HOLDERS AND CONTRIBUTORS "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 COPYRIGHT HOLDER OR CONTRIBUTORS 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.
*/
#include <AK/Types.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/mman.h>
#include <unistd.h>
int main(int argc, char** argv)
{
size_t limit = 0;
size_t bite_size = 0;
int interval = 0;
if (argc == 1) {
limit = 42 * MB;
bite_size = 1 * MB;
interval = 200000;
} else if (argc == 4) {
bite_size = atoi(argv[1]);
limit = atoi(argv[2]);
interval = atoi(argv[3]);
} else {
printf("usage: munch [bite_size limit interval]\n");
return 1;
}
size_t munched = 0;
printf("Munching %zu bytes every %d ms, stopping at %zu\n", bite_size, interval / 1000, limit);
for (;;) {
auto* ptr = mmap(nullptr, bite_size, PROT_READ | PROT_WRITE, MAP_ANONYMOUS | MAP_PRIVATE, 0, 0);
if (ptr == MAP_FAILED) {
perror("mmap");
return 1;
}
memset(ptr, 0, bite_size);
munched += bite_size;
printf("Allocated: %zu\n", munched);
if (limit && munched >= limit) {
printf("All done!\n");
break;
}
usleep(interval);
}
return 0;
}
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