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, 3 insertions, 2 deletions

diff --git a/sys/i386/linux/imgact_linux.c b/sys/i386/linux/imgact_linux.c
index 2351c84..4aae9f5 100644
--- a/sys/i386/linux/imgact_linux.c
+++ b/sys/i386/linux/imgact_linux.c
@@ -28,7 +28,7 @@
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  *
- *	$Id: imgact_linux.c,v 1.20 1997/02/22 09:38:18 peter Exp $
+ *	$Id: imgact_linux.c,v 1.21 1997/04/01 08:39:05 bde Exp $
  */
 
 #ifndef LKM
@@ -65,7 +65,7 @@ exec_linux_imgact(imgp)
     struct image_params *imgp;
 {
     const struct exec *a_out = (const struct exec *) imgp->image_header;
-    struct vmspace *vmspace = imgp->proc->p_vmspace;
+    struct vmspace *vmspace;
     vm_offset_t vmaddr;
     unsigned long virtual_offset, file_offset;
     vm_offset_t buffer;
@@ -122,6 +122,7 @@ exec_linux_imgact(imgp)
      * Destroy old process VM and create a new one (with a new stack)
      */
     exec_new_vmspace(imgp);
+    vmspace = imgp->proc->p_vmspace;
 
     /*
      * Check if file_offset page aligned,.