114 lines
3.8 KiB
C
114 lines
3.8 KiB
C
/*
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* Copyright (c) 2000, 2001, 2002, 2003, 2004, 2005, 2008, 2009
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* The President and Fellows of Harvard College.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE UNIVERSITY AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE UNIVERSITY OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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/*
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* forkbomb - apply malthus to an operating system ;-)
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*
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* DO NOT RUN THIS ON A REAL SYSTEM - IT WILL GRIND TO A HALT AND
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* PEOPLE WILL COME AFTER YOU WIELDING BASEBALL BATS OR THE AD
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* BOARD(*). WE WARNED YOU.
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*
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* We don't expect your system to withstand this without grinding to
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* a halt, but once your basic system calls are complete it shouldn't
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* crash. Likewise for after your virtual memory system is complete.
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*
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* (...at least in an ideal world. However, it can be difficult to
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* handle all the loose ends involved. Heroic measures are not
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* expected. If in doubt, talk to the course staff.)
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*
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*
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* (*) The Administrative Board of Harvard College handles formal
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* disciplinary action.
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*/
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#include <unistd.h>
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#include <err.h>
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#include <time.h>
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#include <test161/test161.h>
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#define TEST_DURATION 10
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#define LOCAL_SUCCESS "SUCCESS"
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static volatile int pid;
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int
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main(void)
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{
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int i;
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time_t start_time_s, time_now_s;
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unsigned long start_time_ns, time_now_ns;
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__time(&start_time_s, &start_time_ns);
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int parent_pid = getpid();
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int did_print = 0;
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int iters = 0;
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// Do not remove!
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// We need to cause page faults on the static secprintf buffers so the
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// pages are available when we print success. With on-demand page allocation,
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// we will probably be out of pages by the time we try to print success.
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secprintf(SECRET, "!!< Starting Forkbbbboooommmmbbbb >!!", "/testbin/forkbomb");
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// And now for the success string
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printf("This should print %s after 10s\n", LOCAL_SUCCESS);
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while (1) {
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fork();
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// Only parent gets to print
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if(getpid() == parent_pid) {
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TEST161_LPROGRESS(0);
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if (iters > 0 && iters % 20 == 0) {
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putchar('\n');
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}
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iters++;
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__time(&time_now_s, &time_now_ns);
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if (time_now_s - start_time_s > TEST_DURATION && !did_print) {
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did_print = 1;
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// We need to print this using secprintf so that it uses
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// the same page we warmed up earlier.
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secprintf(SECRET, LOCAL_SUCCESS, "/testbin/forkbomb");
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}
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}
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pid = getpid();
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/* Make sure each fork has its own address space. */
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for (i=0; i<300; i++) {
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volatile int seenpid;
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seenpid = pid;
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if (seenpid != getpid()) {
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errx(1, "pid mismatch (%d, should be %d) "
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"- your vm is broken!",
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seenpid, getpid());
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}
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}
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}
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}
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