Aout this function

[Tyler]

I have seen one function implementationin C library like this:
void(*
signal(int sig, void(*func)(int)))(int)
{
/*implementation*/
}

I don't konw the meaning of this style of function implementation?

 

[Robert W Hand]

I have seen one function implementationin C library like this:
void(*
signal(int sig, void(*func)(int)))(int)
{
/*implementation*/
}

I don't konw the meaning of this style of function implementation?

http://www.cs.umu.se/~isak/Snippets/rtlftrul.txt

Usually an application of the right left rule is worthwhile. The
above is a reference to it.

In this case, signal is a function whose first parameter is of type
int and whose second parameter is of type pointer to function that
takes an int and returns void. signal returns a pointer to function
that takes an int and returns a void.

Best wishes,

Bob