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| author | jhb <jhb@FreeBSD.org> | 2008-06-26 13:51:25 +0000 |
|---|---|---|
| committer | jhb <jhb@FreeBSD.org> | 2008-06-26 13:51:25 +0000 |
| commit | ed2c19947c0fe3e8fb2c15a829d3946d0eeb7c18 (patch) | |
| tree | 4deb3ffb2f2d730885f715552cc617bbbf5c7e07 | |
| parent | fd5bd912ed377b988835baf77ec4dbca60d10820 (diff) | |
| download | FreeBSD-src-ed2c19947c0fe3e8fb2c15a829d3946d0eeb7c18.zip FreeBSD-src-ed2c19947c0fe3e8fb2c15a829d3946d0eeb7c18.tar.gz | |
Change SEM_VALUE_MAX (maximum value of a POSIX semaphore) from UINT_MAX
to INT_MAX. Otherwise, a process could create a semaphore (or increase
its value via ksem_post()) beyond INT_MAX and sem_getvalue() would return
a negative value. sem_getvalue() is only supposed to return a negative
value if that is the number of waiters for that semaphore.
MFC after: 2 weeks
| -rw-r--r-- | sys/sys/semaphore.h | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/sys/sys/semaphore.h b/sys/sys/semaphore.h index 1806252..34ede7b 100644 --- a/sys/sys/semaphore.h +++ b/sys/sys/semaphore.h @@ -37,12 +37,14 @@ #ifndef _SEMAPHORE_H_ #define _SEMAPHORE_H_ +#include <machine/_limits.h> + /* Opaque type definition. */ struct sem; typedef struct sem * sem_t; #define SEM_FAILED ((sem_t *)0) -#define SEM_VALUE_MAX (~0U) /* Equivalent to UINT_MAX. */ +#define SEM_VALUE_MAX __INT_MAX #ifndef _KERNEL #include <sys/cdefs.h> |
