/usr/include/linux/patchkey.h is in linux-libc-dev 4.15.0-20.21.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 | /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
/*
* <linux/patchkey.h> -- definition of _PATCHKEY macro
*
* Copyright (C) 2005 Stuart Brady
*
* This exists because awe_voice.h defined its own _PATCHKEY and it wasn't
* clear whether removing this would break anything in userspace.
*
* Do not include this file directly. Please use <sys/soundcard.h> instead.
* For kernel code, use <linux/soundcard.h>
*/
#ifndef _LINUX_PATCHKEY_H_INDIRECT
#error "patchkey.h included directly"
#endif
#ifndef _LINUX_PATCHKEY_H
#define _LINUX_PATCHKEY_H
/* Endian macros. */
# include <endian.h>
#if defined(__BYTE_ORDER)
# if __BYTE_ORDER == __BIG_ENDIAN
# define _PATCHKEY(id) (0xfd00|id)
# elif __BYTE_ORDER == __LITTLE_ENDIAN
# define _PATCHKEY(id) ((id<<8)|0x00fd)
# else
# error "could not determine byte order"
# endif
#endif
#endif /* _LINUX_PATCHKEY_H */
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