Garrett Cooper added the comment:
Yes, it's a duplicate. That being said, documentation alone it should be
unsigned long for Darwin (OS/X), FreeBSD, OpenBSD. Looking at the definition
for ioctl(2), the below example would cause a failure.
I need to hunt around for a practical example as I don't have one offhand (it's
something that was found a long time ago in a couple of python 2.6 at my
current employer because they have ioctl's that go beyond the 32-bit boundary
IIRC...)
fuji:~ ngie$ clang -Wall -c test_ioctl.c
fuji:~ ngie$ clang -DBROKEN -Wall -c test_ioctl.c
test_ioctl.c:9:9: warning: incompatible pointer types initializing 'ioctl_t'
(aka 'int (*)(int, int, ...)') with an expression of type 'int (int,
unsigned long, ...)' [-Wincompatible-pointer-types]
ioctl_t _ioctl = ioctl;
^ ~~~~~
1 warning generated.
fuji:~ ngie$ cat test_ioctl.c
#include <sys/ioctl.h>
#ifdef BROKEN
typedef int (*ioctl_t)(int, int, ...);
#else
typedef int (*ioctl_t)(int, unsigned long, ...);
#endif
ioctl_t _ioctl = ioctl;
fuji:~ ngie$ uname -a
Darwin fuji.local 13.4.0 Darwin Kernel Version 13.4.0: Wed Dec 17 19:05:52 PST
2014; root:xnu-2422.115.10~1/RELEASE_X86_64 x86_64
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<http://bugs.python.org/issue16124>
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