kern_descrip.c: add fdshare()/fdcopy()

kern_fork.c: add the tiny bit of code for rfork operation.
kern/sysv_*: shmfork() takes one less arg, it was never used.
sys/shm.h: drop "isvfork" arg from shmfork() prototype
sys/param.h: declare rfork args.. (this is where OpenBSD put it..)
sys/filedesc.h: protos for fdshare/fdcopy.
vm/vm_mmap.c: add minherit code, add rounding to mmap() type args where
it makes sense.
vm/*: drop unused isvfork arg.

Note: this rfork() implementation copies the address space mappings,
it does not connect the mappings together.  ie: once the two processes
have split, the pages may be shared, but the address space is not. If one
does a mmap() etc, it does not appear in the other.  This makes it not
useful for pthreads, but it is useful in it's own right for having
light-weight threads in a static shared address space.

Obtained from: Original by Ron Minnich, extended by OpenBSD

1 files changed, 2 insertions, 2 deletions

diff --git a/sys/vm/vm_extern.h b/sys/vm/vm_extern.h
index c6b3067..b0d7480 100644
--- a/sys/vm/vm_extern.h
+++ b/sys/vm/vm_extern.h
@@ -31,7 +31,7 @@
  * SUCH DAMAGE.
  *
  *	@(#)vm_extern.h	8.2 (Berkeley) 1/12/94
- * $Id: vm_extern.h,v 1.22 1995/12/14 09:54:55 phk Exp $
+ * $Id: vm_extern.h,v 1.23 1996/02/04 22:08:57 dyson Exp $
  */
 
 #ifndef _VM_EXTERN_H_
@@ -88,7 +88,7 @@ int vm_fault __P((vm_map_t, vm_offset_t, vm_prot_t, boolean_t));
 void vm_fault_copy_entry __P((vm_map_t, vm_map_t, vm_map_entry_t, vm_map_entry_t));
 void vm_fault_unwire __P((vm_map_t, vm_offset_t, vm_offset_t));
 int vm_fault_wire __P((vm_map_t, vm_offset_t, vm_offset_t));
-int vm_fork __P((struct proc *, struct proc *, int));
+int vm_fork __P((struct proc *, struct proc *));
 void vm_map_print __P((/* db_expr_t */ int, boolean_t, /* db_expr_t */ int, char *));
 int vm_mmap __P((vm_map_t, vm_offset_t *, vm_size_t, vm_prot_t, vm_prot_t, int, caddr_t, vm_ooffset_t));
 vm_offset_t vm_page_alloc_contig __P((vm_offset_t, vm_offset_t, vm_offset_t, vm_offset_t));