Fully implement vfork. Vfork is now much much faster than even our

	fork. (On my machine, fork is about 240usecs, vfork is 78usecs.)

Implement rfork(!RFPROC !RFMEM), which allows a thread to divorce its memory
	from the other threads of a group.

Implement rfork(!RFPROC RFCFDG), which closes all file descriptors, eliminating
	possible existing shares with other threads/processes.

Implement rfork(!RFPROC RFFDG), which divorces the file descriptors for a
	thread from the rest of the group.

Fix the case where a thread does an exec.  It is almost nonsense for a thread
	to modify the other threads address space by an exec, so we
	now automatically divorce the address space before modifying it.

1 files changed, 4 insertions, 2 deletions

diff --git a/sys/kern/imgact_gzip.c b/sys/kern/imgact_gzip.c
index 9a3237f..e92db9b 100644
--- a/sys/kern/imgact_gzip.c
+++ b/sys/kern/imgact_gzip.c
@@ -6,7 +6,7 @@
  * this stuff is worth it, you can buy me a beer in return.   Poul-Henning Kamp
  * ----------------------------------------------------------------------------
  *
- * $Id$
+ * $Id: imgact_gzip.c,v 1.28 1997/02/22 09:38:57 peter Exp $
  *
  * This module handles execution of a.out files which have been run through
  * "gzip".  This saves diskspace, but wastes cpu-cycles and VM.
@@ -149,7 +149,7 @@ static int
 do_aout_hdr(struct imgact_gzip * gz)
 {
 	int             error;
-	struct vmspace *vmspace = gz->ip->proc->p_vmspace;
+	struct vmspace *vmspace;
 	vm_offset_t     vmaddr;
 
 	/*
@@ -227,6 +227,8 @@ do_aout_hdr(struct imgact_gzip * gz)
 	 */
 	exec_new_vmspace(gz->ip);
 
+	vmspace = gz->ip->proc->p_vmspace;
+
 	vmaddr = gz->virtual_offset;
 
 	error = vm_mmap(&vmspace->vm_map,