The ulimit -c unlimited can also be done by the app via getrlimit and setrlimit. e.g. #include <unistd.h> #include <signal.h> #include <sys/resource.h> #include <stdio.h> int main(int argc, char *argv[]) {   pid_t pid = getpid();   struct rlimit l;   int ret = getrlimit(RLIMIT_CORE, &l);   printf("getrlimit returned %d\n", ret);   printf("rlim_cur = %llu\n", l.rlim_cur);   printf("rlim_max = %llu\n", l.rlim_max);   l.rlim_cur = l.rlim_max;   printf("setrlimit returned %d\n", setrlimit(RLIMIT_CORE, &l));   printf("Time to kill myself\n");   kill(pid, SIGBUS); }