[PATCH] getrusage sucks

[Claudio Scordino <cloud.of.andor@gmail.com>]

Does exist any _real_ reason why getrusage can't be invoked by a task to know 
statistics of another task ?

The changes would be very trivial, as shown by the following patch.

              Claudio


diff --git a/kernel/sys.c b/kernel/sys.c
--- a/kernel/sys.c
+++ b/kernel/sys.c
@@ -1746,9 +1746,13 @@ int getrusage(struct task_struct *p, int

 asmlinkage long sys_getrusage(int who, struct rusage __user *ru)
 {
-  if (who != RUSAGE_SELF && who != RUSAGE_CHILDREN)
-     return -EINVAL;
-  return getrusage(current, who, ru);
+  if (who != RUSAGE_SELF && who != RUSAGE_CHILDREN) {
+      struct task_struct* tsk = find_task_by_pid(who);
+      if (tsk == NULL)
+        return -EINVAL;
+     return getrusage(tsk, RUSAGE_SELF, ru);
+   } else
+     return getrusage(current, who, ru);
 }

 asmlinkage long sys_umask(int mask)