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| author | Lennart Poettering <lennart@poettering.net> | 2015-01-09 16:25:47 +0100 |
|---|---|---|
| committer | Lennart Poettering <lennart@poettering.net> | 2015-01-09 18:35:36 +0100 |
| commit | 8cb4ab0058e51f1fba93683d145ef95f97c2fa86 (patch) | |
| tree | 022bbd937efd224d8de1e2c5db66331a6149ed74 /src/shared | |
| parent | 309a29dfd24f4175de334ca1593e3fe2436ab082 (diff) | |
logind: unify how we cast between uid_t and pointers for hashmap keys
Diffstat (limited to 'src/shared')
| -rw-r--r-- | src/shared/macro.h | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/src/shared/macro.h b/src/shared/macro.h index 6a57428244..daa42c4c68 100644 --- a/src/shared/macro.h +++ b/src/shared/macro.h @@ -275,6 +275,14 @@ static inline unsigned long ALIGN_POWER2(unsigned long u) { #define PTR_TO_SIZE(p) ((size_t) ((uintptr_t) (p))) #define SIZE_TO_PTR(u) ((void *) ((uintptr_t) (u))) +/* The following macros add 1 when converting things, since UID 0 is a + * valid UID, while the pointer NULL is special */ +#define PTR_TO_UID(p) ((uid_t) (((uintptr_t) (p))-1)) +#define UID_TO_PTR(u) ((void*) (((uintptr_t) (u))+1)) + +#define PTR_TO_GID(p) ((gid_t) (((uintptr_t) (p))-1)) +#define GID_TO_PTR(u) ((void*) (((uintptr_t) (u))+1)) + #define memzero(x,l) (memset((x), 0, (l))) #define zero(x) (memzero(&(x), sizeof(x))) |