From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from wes1-so1.wedos.net (wes1-so1.wedos.net [46.28.106.15]) by dpdk.org (Postfix) with ESMTP id B0EFFADB6 for ; Fri, 8 Jul 2016 21:10:36 +0200 (CEST) Received: from pcviktorin.fit.vutbr.cz (pcviktorin.fit.vutbr.cz [147.229.13.147]) by wes1-so1.wedos.net (Postfix) with ESMTPSA id 3rmPG4400pzCCG; Fri, 8 Jul 2016 21:10:36 +0200 (CEST) From: Jan Viktorin To: dev@dpdk.org Cc: Jan Viktorin , Shreyansh Jain , thomas.monjalon@6wind.com, David Marchand Date: Fri, 8 Jul 2016 21:09:38 +0200 Message-Id: <20160708190945.24225-9-viktorin@rehivetech.com> X-Mailer: git-send-email 2.9.0 In-Reply-To: <20160708190945.24225-1-viktorin@rehivetech.com> References: <20160708190945.24225-1-viktorin@rehivetech.com> Subject: [dpdk-dev] [PATCH v1 08/15] eal: define macro container_of X-BeenThere: dev@dpdk.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: patches and discussions about DPDK List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 08 Jul 2016 19:10:36 -0000 Signed-off-by: Jan Viktorin --- 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) -- 2.9.0