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Add the container_of() macro to macro.h
[lttng-tools.git]
/
src
/
common
/
macros.h
diff --git
a/src/common/macros.h
b/src/common/macros.h
index 90849ed30ae5e543a577f9214bc33152864751f8..7eaf27cdf3787cbf02d5c4fc2bc48eb43632b734 100644
(file)
--- a/
src/common/macros.h
+++ b/
src/common/macros.h
@@
-20,6
+20,7
@@
#define _MACROS_H
#include <stdlib.h>
#define _MACROS_H
#include <stdlib.h>
+#include <stddef.h>
#include <string.h>
#include <common/compat/string.h>
#include <string.h>
#include <common/compat/string.h>
@@
-58,6
+59,14
@@
void *zmalloc(size_t len)
#define ARRAY_SIZE(array) (sizeof(array) / (sizeof((array)[0])))
#endif
#define ARRAY_SIZE(array) (sizeof(array) / (sizeof((array)[0])))
#endif
+#ifndef container_of
+#define container_of(ptr, type, member) \
+ ({ \
+ const typeof(((type *)NULL)->member) * __ptr = (ptr); \
+ (type *)((char *)__ptr - offsetof(type, member)); \
+ })
+#endif
+
#ifndef max
#define max(a, b) ((a) > (b) ? (a) : (b))
#endif
#ifndef max
#define max(a, b) ((a) > (b) ? (a) : (b))
#endif
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