function - C declaration from standard signal Library -

so can explain supposed do:

void (*signal(int sig, void (*func)(int)) ) (int); 

it definition taken standard signal library.

start name:

signal 

go right far can:

signal(int sig, void (*func)(int)) 

you have parenthesized list of parameters, it's function taking 2 parameters: int named sig , function pointer named func (you can analyze in same way later).

then hit rightparen, go left:

*signal(int sig, void (*func)(int)) 

so function signal returns pointer to... something. let's take down parenthesis , go right again, since can:

(*signal(int sig, void (*func)(int)) ) (int) 

we have again parenthesized list of arguments, signal returns pointer function takes int argument. go left again:

void (*signal(int sig, void (*func)(int)) ) (int) 

thus function signal returns pointer function taking int , returning void.

yes, language weird, @ least it's consistent. :)