84 lines
2.4 KiB
C
84 lines
2.4 KiB
C
/*
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* Copyright (C) 2008 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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* Simple cpu eater busy loop. Runs as a daemon. prints the child PID to
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* std so you can easily kill it later.
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*/
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#include <stdio.h>
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#include <unistd.h>
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#include <stdlib.h>
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#include <fcntl.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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int main(int argc, char *argv[])
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{
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pid_t pid;
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int life_universe_and_everything;
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int fd;
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switch(fork()) {
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case -1:
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perror(argv[0]);
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exit(1);
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break;
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case 0: /* child */
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chdir("/");
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umask(0);
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setpgrp();
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setsid();
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/* fork again to fully detach from controlling terminal. */
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switch(pid = fork()) {
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case -1:
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break;
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case 0: /* second child */
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/* redirect to /dev/null */
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close(0);
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open("/dev/null", 0);
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close(1);
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if(open("/dev/null", O_WRONLY) < 0) {
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perror("/dev/null");
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exit(1);
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}
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fflush(stdout);
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close(2);
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dup(1);
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for (fd = 3; fd < 256; fd++) {
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close(fd);
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}
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/* busy looper */
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while (1) {
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life_universe_and_everything = 42 * 2;
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}
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default:
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/* so caller can easily kill it later. */
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printf("%d\n", pid);
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exit(0);
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break;
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}
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break;
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default:
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exit(0);
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break;
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}
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return 0;
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}
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/* vim:ts=4:sw=4:softtabstop=4:smarttab:expandtab */
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