Change the ABI of some of the structures used by the SYSV IPC API:

- The uid/cuid members of struct ipc_perm are now uid_t instead of unsigned
  short.
- The gid/cgid members of struct ipc_perm are now gid_t instead of unsigned
  short.
- The mode member of struct ipc_perm is now mode_t instead of unsigned short
  (this is merely a style bug).
- The rather dubious padding fields for ABI compat with SV/I386 have been
  removed from struct msqid_ds and struct semid_ds.
- The shm_segsz member of struct shmid_ds is now a size_t instead of an
  int.  This removes the need for the shm_bsegsz member in struct
  shmid_kernel and should allow for complete support of SYSV SHM regions
  >= 2GB.
- The shm_nattch member of struct shmid_ds is now an int instead of a
  short.
- The shm_internal member of struct shmid_ds is now gone.  The internal
  VM object pointer for SHM regions has been moved into struct
  shmid_kernel.
- The existing __semctl(), msgctl(), and shmctl() system call entries are
  now marked COMPAT7 and new versions of those system calls which support
  the new ABI are now present.
- The new system calls are assigned to the FBSD-1.1 version in libc.  The
  FBSD-1.0 symbols in libc now refer to the old COMPAT7 system calls.
- A simplistic framework for tagging system calls with compatibility
  symbol versions has been added to libc.  Version tags are added to
  system calls by adding an appropriate __sym_compat() entry to
  src/lib/libc/incldue/compat.h. [1]

PR:		kern/16195 kern/113218 bin/129855
Reviewed by:	arch@, rwatson
Discussed with:	kan, kib [1]

1 files changed, 4 insertions, 2 deletions

diff --git a/sys/i386/ibcs2/ibcs2_ipc.c b/sys/i386/ibcs2/ibcs2_ipc.c
index 5b6342a..f606c1b 100644
--- a/sys/i386/ibcs2/ibcs2_ipc.c
+++ b/sys/i386/ibcs2/ibcs2_ipc.c
@@ -415,7 +415,10 @@ struct ibcs2_shmid_ds *ibp;
 	ibp->shm_segsz = bp->shm_segsz;
 	ibp->shm_lpid = bp->shm_lpid;
 	ibp->shm_cpid = bp->shm_cpid;
-	ibp->shm_nattch = bp->shm_nattch;
+	if (bp->shm_nattch > SHRT_MAX)
+		ibp->shm_nattch = SHRT_MAX;
+	else
+		ibp->shm_nattch = bp->shm_nattch;
 	ibp->shm_cnattch = 0;			/* ignored anyway */
 	ibp->shm_atime = bp->shm_atime;
 	ibp->shm_dtime = bp->shm_dtime;
@@ -436,7 +439,6 @@ struct shmid_ds *bp;
 	bp->shm_atime = ibp->shm_atime;
 	bp->shm_dtime = ibp->shm_dtime;
 	bp->shm_ctime = ibp->shm_ctime;
-	bp->shm_internal = (void *)0;		/* ignored anyway */
 	return;
 }