set rlimit for core file

rlimit_core.c

struct rlimit rl;
memset(&rl, 0, sizeof(rl));
rl.rlim_cur = RLIM_INFINITY;
rl.rlim_max = RLIM_INFINITY;
if (setrlimit(RLIMIT_CORE, &rl)) {
  fprintf(stderr, "Unable to disable core size resource limit: %s\n", strerror(errno));
}

This can be simplified using designated initializers, which automatically set unspecified fields to zero:

struct rlimit rl = {
    .rlim_cur = RLIM_INFINITY,
    .rlim_max = RLIM_INFINITY,
};
if (setrlimit(RLIMIT_CORE, &rl)) {
    fprintf(stderr, "Unable to disable core size resource limit: %s\n", strerror(errno));
}