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BUILD: compiler: add the container_of() and container_of_safe() macros

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These ones are called from a few places in the code and are only provided
by ebtree.h, which is not normal given that some callers do not even use
ebtree.
This commit is contained in:
Willy Tarreau 2021-10-06 18:11:38 +02:00
parent 74f2456c42
commit 337f23a112
1 changed files with 17 additions and 0 deletions
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17
include/haproxy/compiler.h
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@ -171,6 +171,23 @@
#endif
#endif
/* Linux-like "container_of". It returns a pointer to the structure of type
* <type> which has its member <name> stored at address <ptr>.
*/
#ifndef container_of
#define container_of(ptr, type, name) ((type *)(((void *)(ptr)) - ((long)&((type *)0)->name)))
#endif
/* returns a pointer to the structure of type <type> which has its member <name>
* stored at address <ptr>, unless <ptr> is 0, in which case 0 is returned.
*/
#ifndef container_of_safe
#define container_of_safe(ptr, type, name) \
({ void *__p = (ptr); \
__p ? (type *)(__p - ((long)&((type *)0)->name)) : (type *)0; \
})
#endif
/* Some architectures have a double-word CAS, sometimes even dual-8 bytes.
* Some architectures support unaligned accesses, others are fine with them
* but only for non-atomic operations. Also mention those supporting unaligned