Implicit declaration of function 'ether_ntoa' is invalid in C99

Question

It's part of a series of functions that retrieve IP & Mac addresses from the phone.

strcpy(temp, (char *)ether_ntoa((const struct ether_addr *)LLADDR(sdl)));

EDIT: No equivalent function needed, there were just a few missing headers.

EDIT: Added cast to LLADDR(sdl)

It appears to be, despite saying it's a Mac OS X manpage, it is included in the iOS Development Library. http://developer.apple.com/library/ios/#documentation/System/Conceptual/ManPages_iPhoneOS/man3/ether_ntoa.3.html — trojanfoe, Jun 28 '12 at 13:08
Take a look at the Objective C code at this link which might help you from "amcgregor". https://gist.github.com/1265265 — Kevin Horgan, Jun 28 '12 at 13:10

score 15 · Accepted Answer · edited Jul 01 '13 at 18:58

15

As I read it, the error message isn't claiming that the function is missing, only that you don't include its declaration. (I don't know that it exists, only that the message has a different complaint.)

In case it helps, man ether_ntoa tells me:

#include <sys/types.h>
#include <sys/socket.h>
#include <net/ethernet.h>

edited Jul 01 '13 at 18:58

Daniel X Moore

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answered Jun 28 '12 at 13:09

Phillip Mills

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Looks like I was missing #include . However now I get the new error: `"Incompatible pointer types passing 'caddr_t' (aka 'char *') to parameter of type 'const struct ether_addr *'"`. I guess this is a casting-related error? – Orchid Jun 28 '12 at 13:21
I'm not familiar with `LLADDR` but, since the `ether_ntoa` parameter is said to be `const struct ether_addr *`, I'd guess that you're right about the cause of the problem. – Phillip Mills Jun 28 '12 at 13:30
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Ok, the error in the comment above was a type error with the parameter passed to `ether_ntoa()`, because `LLADDR(sdl))` returns a `char *` but `ether_ntoa()` takes something else. Fixed with the cast: `ether_ntoa((const struct ether_addr *)LLADDR(sdl)))` and all appears to still be working. – Orchid Jun 28 '12 at 13:35

score 0 · Answer 2 · answered Dec 24 '14 at 14:52

0

I included following header file and source code compiled successfully:

#import <arpa/inet.h>

answered Dec 24 '14 at 14:52

rjobidon

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Implicit declaration of function 'ether_ntoa' is invalid in C99

2 Answers2