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From: Jesper Brix Rosenkilde <jbr@FreeBSD.org>
To: Perforce Change Reviews <perforce@FreeBSD.org>
Cc: 
Subject: PERFORCE change 123297 for review
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http://perforce.freebsd.org/chv.cgi?CH=123297

Change 123297 by jbr@jbr_bob on 2007/07/10 23:08:41

	First attempt at copying from kernel to user space, not sure it works.

Affected files ...

.. //depot/projects/soc2007/jbr-syscall/src/sys/kern/kern_exec.c#4 edit

Differences ...

==== //depot/projects/soc2007/jbr-syscall/src/sys/kern/kern_exec.c#4 (text+ko) ====

@@ -879,6 +879,11 @@
 	}
 }
 
+struct test {
+	unsigned int pid;
+	char proctitle[256];
+};
+
 /*
  * Destroy old address space, and allocate a new stack
  *	The new stack is only SGROWSIZ large because it is grown
@@ -894,6 +899,8 @@
 	struct vmspace *vmspace = p->p_vmspace;
 	vm_offset_t stack_addr;
 	vm_map_t map;
+	
+	struct test test_data = {42, "Humppa!"};
 
 	imgp->vmspace_destroyed = 1;
 	imgp->sysent = sv;
@@ -918,11 +925,15 @@
 		map = &vmspace->vm_map;
 	}
 
+	sv->sv_sysshm = sv->sv_minuser;
+	
 	/* Allocate memory shared between process and kernel */
-	  error = vm_map_sysshm(map, sv->sv_minuser, 8);
+	  error = vm_map_sysshm(map, sv->sv_sysshm, sizeof(struct test));
 	  if (error)
 		  return (error);
 
+	  copyout(&test_data, (void *) sv->sv_sysshm, sizeof(struct test));
+
 	/* Allocate a new stack */
 	stack_addr = sv->sv_usrstack - maxssiz;
 	error = vm_map_stack(map, stack_addr, (vm_size_t)maxssiz,