What does this C function declaration mean?

Question

schedule_accept(int fd, int (*handler)(int, FdEventHandlerPtr, AcceptRequestPtr), void *data)

Apologies for seeming to avoid searching for an answer here but I don't know what the constructs are in order to search intelligently for them. Specifically I'm interested in what the second parameter means?

My best guess is it's an int (that refers to a memory location) that is composed(?) of a tuple of the three referred to types. Is this correct? If I was only interested in one of these (and I'm right in my description in the first place) how would I refer to it?

It looks like it might be a function pointer with the three types being the parameters. — ChrisF
– ChrisF, Commented Nov 5, 2016 at 21:56
A good tool to use in interpreting complex declarations is "cdecl". — TonyB
– TonyB, Commented Nov 5, 2016 at 22:34
Pointer to a function returning int and taking three parameters, the first being int, the second being of type FdEventHandlerPtr, and the third being AcceptRequestPtr. For more information you need the actual definitions of types for the second and third parameters. — Luis Colorado
– Luis Colorado, Commented Nov 7, 2016 at 7:55

Marcus Müller · Accepted Answer · 2016-11-05 21:55:59Z

int (*handler)(int, FdEventHandlerPtr, AcceptRequestPtr)

Defines a parameter named handler which is a pointer (hence the *) to a function, which returns an int (hence the "outer" int) and takes three arguments, namely one int, one FdEventHandlerPtr and one AcceptRequestPtr.

Collectives™ on Stack Overflow

What does this C function declaration mean?

1 Answer 1

Comments

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

Comments

Related