fopen_or_die
outf = fopen_or_die(optarg, "w");
fp = fopen_or_die(path, "r");
fp = fopen_or_die(proc_stat, "r");
filep = fopen_or_die(pathname, "r");
fp = fopen_or_die("/proc/interrupts", "r");
fp = fopen_or_die("/sys/devices/system/cpu/cpuidle/low_power_idle_cpu_residency_us", "r");
fp = fopen_or_die(sys_lpi_file, "r");
gfx_info[idx].fp = fopen_or_die(path, "r");
fp = fopen_or_die(pathname, "r");
fp = fopen_or_die(proc_stat, "r");
cpuinfo = fopen_or_die("/proc/cpuinfo", "r");