1 /* 2 * This file and its contents are supplied under the terms of the 3 * Common Development and Distribution License ("CDDL"), version 1.0. 4 * You may only use this file in accordance with the terms of version 5 * 1.0 of the CDDL. 6 * 7 * A full copy of the text of the CDDL should have accompanied this 8 * source. A copy of the CDDL is also available via the Internet at 9 * http://www.illumos.org/license/CDDL. 10 */ 11 12 /* 13 * Copyright 2017 Toomas Soome <tsoome@me.com> 14 */ 15 16 #ifndef _SYS_STDDEF_H 17 #define _SYS_STDDEF_H 18 19 /* 20 * Commonly used macros and definitions. 21 */ 22 23 #ifdef __cplusplus 24 extern "C" { 25 #endif 26 27 #if !defined(offsetof) 28 #if __GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 5) 29 #define offsetof(s, m) __builtin_offsetof(s, m) 30 #else 31 #if __cplusplus >= 199711L 32 #define offsetof(s, m) (std::size_t)(&(((s *)NULL)->m)) 33 #else 34 #define offsetof(s, m) ((size_t)(&(((s *)NULL)->m))) 35 #endif 36 #endif 37 #endif /* !offsetof */ 38 39 #if !defined(container_of) 40 41 /* 42 * We must not expose container_of() to userland, but we want it 43 * to be available for early boot and for the kernel. 44 */ 45 #if ((defined(_KERNEL) || defined(_FAKE_KERNEL)) && !defined(_KMEMUSER)) || \ 46 (defined(_BOOT) && defined(_KMEMUSER)) 47 #define container_of(m, s, name) \ 48 (void *)((uintptr_t)(m) - (uintptr_t)offsetof(s, name)) 49 #endif 50 #endif /* !container_of */ 51 52 #ifdef __cplusplus 53 } 54 #endif 55 56 #endif /* _SYS_STDDEF_H */ 57