path: root/include/sys/sem.h
diff options
authorRich Felker <>2013-06-28 23:57:58 -0400
committerRich Felker <>2013-06-28 23:57:58 -0400
commit062f40ef3e56021f4a9902095867e35cce6d99c4 (patch)
tree102a798592f8fdc5c74acdec9d8cb673b822cb93 /include/sys/sem.h
parent553d566c3f7080cf1f339eebf715db7e5d0b0d76 (diff)
work around wrong kernel type for sem_nsems member of struct semid_ds
rejecting invalid values for n is fine even in the case where a new sem will not be created, since the kernel does its range checks on n even in this case as well. by default, the kernel will bound the limit well below USHRT_MAX anyway, but it's presumably possible that an administrator could override this limit and break things.
Diffstat (limited to 'include/sys/sem.h')
1 files changed, 9 insertions, 1 deletions
diff --git a/include/sys/sem.h b/include/sys/sem.h
index cc3a3e63..e74ea208 100644
--- a/include/sys/sem.h
+++ b/include/sys/sem.h
@@ -25,13 +25,21 @@ extern "C" {
#define SETVAL 16
#define SETALL 17
+#include <endian.h>
struct semid_ds {
struct ipc_perm sem_perm;
long sem_otime;
unsigned long __unused1;
long sem_ctime;
unsigned long __unused2;
- unsigned long sem_nsems;
+ unsigned short sem_nsems;
+ char __sem_nsems_pad[sizeof(long)-sizeof(short)];
+ char __sem_nsems_pad[sizeof(long)-sizeof(short)];
+ unsigned short sem_nsems;
unsigned long __unused3;
unsigned long __unused4;