[PATCH v8 01/25] eal: define macro container_of
From: Shreyansh Jain <hidden>
Date: 2016-08-26 13:57:31
Subsystem:
library code, the rest · Maintainers:
Andrew Morton, Linus Torvalds
Signed-off-by: Jan Viktorin <redacted> Signed-off-by: Shreyansh Jain <redacted> --- lib/librte_eal/common/include/rte_common.h | 16 ++++++++++++++++ 1 file changed, 16 insertions(+)
diff --git a/lib/librte_eal/common/include/rte_common.h b/lib/librte_eal/common/include/rte_common.h
index 332f2a4..a9b6792 100644
--- a/lib/librte_eal/common/include/rte_common.h
+++ b/lib/librte_eal/common/include/rte_common.h@@ -322,6 +322,22 @@ rte_bsf32(uint32_t v) #define offsetof(TYPE, MEMBER) __builtin_offsetof (TYPE, MEMBER) #endif +/** + * Return pointer to the wrapping struct instance. + * Example: + * + * struct wrapper { + * ... + * struct child c; + * ... + * }; + * + * struct child *x = obtain(...); + * struct wrapper *w = container_of(x, struct wrapper, c); + */ +#define container_of(p, type, member) \ + ((type *) (((char *) (p)) - offsetof(type, member))) + #define _RTE_STR(x) #x /** Take a macro value and get a string version of it */ #define RTE_STR(x) _RTE_STR(x)
--
2.7.4