root/sys/compat/linuxkpi/common/include/linux/stddef.h
/* Public domain */

#ifndef _LINUXKPI_LINUX_STDDEF_H_
#define _LINUXKPI_LINUX_STDDEF_H_

#include <sys/stddef.h>

/*
 * FreeBSD has multiple (vendor) drivers containing copies of this
 * and including LinuxKPI headers.  Put the #defines behind guards.
 */

#ifndef __struct_group
#define __struct_group(_tag, _name, _attrs, _members...)                \
    union {                                                             \
        struct { _members } _attrs;                                     \
        struct _tag { _members } _attrs _name;                          \
    } _attrs
#endif

#ifndef struct_group
#define struct_group(_name, _members...)                                \
    __struct_group(/* no tag */, _name, /* no attrs */, _members)
#endif

#ifndef struct_group_tagged
#define struct_group_tagged(_tag, _name, _members...)                   \
    __struct_group(_tag, _name, /* no attrs */, _members)
#endif

#endif  /* _LINUXKPI_LINUX_STDDEF_H_ */