> +int should_stop = 0;
this should use sig_atomic_t, or at least volatile.
>
> void add_to_flist(int, int, int);
> void append_pathname(pathname_t *, char *);
> @@ -253,6 +256,10 @@ void usage(void);
> void write_freq(void);
> void zero_freq(void);
>
> +void sg_handler(int signum) {
> + should_stop = 1;
> +}
please use normal K&R / Linux style brace placement.
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