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void setdaemon(const char * pid_file){ pid_t pid; if(!pid_file) { return; } if((pid = fork()) < 0) { exit(-1); } if(pid) { exit(0); } setsid(); if ((pid = fork()) < 0) { exit(-1); } if (pid) { exit(0); } write_pid(pid_file);}void test(){ setdaemon("daemon.pid"); while(1) { print("daemon process!\n"); sleep(1); }}void main(){ pid_t pid = -1; int exitcode = 0; pid = fork(); if(pid == 0) { test(); } pid = wait(&exitcode); exit(0);}
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