c: using copyfile.h for Mac - c

Question

I am new to c. I am playing with the Mac OSX copyfile.h function to move a file using c. Header file found here: http://bit.ly/IGMSec
int copyfile(const char *from, const char *to, copyfile_state_t state, copyfile_flags_t flags);
Here is my code:
#include <copyfile.h>
int main() {
int success;
const char* from = "hello.text";
const char* to = "/toGo/hello.txt";
copyfile_state_t state = copyfile_init();
copyfile_flags_t flags = "COPYFILE_MOVE";
success = copyfile(from, to, state, flags);
printf ("%d\n", success);
exit(0);
}
I added copyfile_init() function to initialize the state. And I get compiling issues now but I think I am getting in the right direction.
$ gcc move.c
Undefined symbols for architecture x86_64:
"_copyfile_init", referenced from:
_main in ccXJr5oN.o
ld: symbol(s) not found for architecture x86_64
collect2: ld returned 1 exit status
Based on what I've seen online this is a linking issue. So I added the link tag but it's not finding the file, and this header is supposed to be in OSX source.
$ gcc move.c -lcopyfile
ld: library not found for -lcopyfile

Answer 1

COPYFILE_MOVE is a flag constant. It doesn't belong in a string. To actually transfer the file's data, you'll also need to set the COPYFILE_DATA flag.
Also, you can leave out the state parameter. (You didn't bother to initialize it anyway.) Just pass NULL instead.
This should work:
#include <stdio.h>
#include <copyfile.h>
int main() {
int success;
const char* from = "hello.text";
const char* to = "/toGo/hello.txt";
copyfile_flags_t flags = COPYFILE_MOVE | COPYFILE_DATA;
success = copyfile(from, to, NULL, flags);
printf ("%d\n", success);
return 0;
}