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83 lines
2.4 KiB
83 lines
2.4 KiB
/* |
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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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