[newlib-cygwin] Move 32-bit compat support for FIODGNAME to the right place.

[newlib-cygwin] Move 32-bit compat support for FIODGNAME to the right place.

[Sebastian Huber]

https://sourceware.org/git/gitweb.cgi?p=newlib-cygwin.git;h=c42aaaea4fd0effa2ad7871045eeb59eb53fa507

commit c42aaaea4fd0effa2ad7871045eeb59eb53fa507
Author: Brooks Davis <brooks@FreeBSD.org>
Date:   Fri Oct 26 17:59:25 2018 +0000

    Move 32-bit compat support for FIODGNAME to the right place.
    
    ioctl(2) commands only have meaning in the context of a file descriptor
    so translating them in the syscall layer is incorrect.
    
    The new handler users an accessor to retrieve/construct a pointer from
    the last member of the passed structure and relies on type punning to
    access the other member which requires no translation.
    
    Unlike r339174 this change supports both places FIODGNAME is handled.
    
    Reviewed by:    kib
    Obtained from:  CheriBSD
    Sponsored by:   DARPA, AFRL
    Differential Revision:  https://reviews.freebsd.org/D17475

Diff:
---
 newlib/libc/sys/rtems/include/sys/filio.h | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/newlib/libc/sys/rtems/include/sys/filio.h b/newlib/libc/sys/rtems/include/sys/filio.h
index 7899791f7..868fe53c2 100644
--- a/newlib/libc/sys/rtems/include/sys/filio.h
+++ b/newlib/libc/sys/rtems/include/sys/filio.h
@@ -63,4 +63,16 @@ struct fiodgname_arg {
 #define	FIOSEEKDATA	_IOWR('f', 97, off_t)	/* SEEK_DATA */
 #define	FIOSEEKHOLE	_IOWR('f', 98, off_t)	/* SEEK_HOLE */
 
+#ifdef _KERNEL
+#ifdef COMPAT_FREEBSD32
+struct fiodgname_arg32 {
+	int		len;
+	uint32_t	buf;	/* (void *) */
+};
+#define	FIODGNAME_32	_IOC_NEWTYPE(FIODGNAME, struct fiodgname_arg32)
+#endif
+
+void	*fiodgname_buf_get_ptr(void *fgnp, u_long com);
+#endif
+
 #endif /* !_SYS_FILIO_H_ */