:sig
s64 file_tell(u64 h)

:params
h : handle from file_open()
return value : the current absolute byte offset

:content
Returns a handle's current read/write offset, as moved by `file_read()`, `file_write()`, and `file_seek()`.

:example
u64 h = file_open("/tmp/doc-tell.txt", "w");
file_write(h, "hello");
print("offset is ", file_tell(h), "\n");
file_close(h);

:see
>sys
file_seek
file_open
