[PATCH 11/17] tools/kvm_stat: print error messages on faulty pid filter input

[Stefan Raspl <raspl@linux.vnet.ibm.com>]

Print helpful messages in case users enter invalid input or invalid pids in
the interactive pid filter dialogue.

Signed-off-by: Stefan Raspl <raspl@linux.vnet.ibm.com>
Reviewed-by: Marc Hartmayer <mhartmay@linux.vnet.ibm.com>
---
 tools/kvm/kvm_stat/kvm_stat | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/tools/kvm/kvm_stat/kvm_stat b/tools/kvm/kvm_stat/kvm_stat
index 8271b41..db6a624 100755
--- a/tools/kvm/kvm_stat/kvm_stat
+++ b/tools/kvm/kvm_stat/kvm_stat
@@ -975,6 +975,7 @@ class Tui(object):
         Asks for a pid until a valid pid or 0 has been entered.
 
         """
+        msg = ''
         while True:
             self.screen.erase()
             self.screen.addstr(0, 0,
@@ -983,6 +984,7 @@ class Tui(object):
             self.screen.addstr(1, 0,
                                'This might limit the shown data to the trace '
                                'statistics.')
+            self.screen.addstr(5, 0, msg)
 
             curses.echo()
             self.screen.addstr(3, 0, "Pid [0 or pid]: ")
@@ -994,6 +996,7 @@ class Tui(object):
                     pid = int(pid)
                     if pid != 0 and not os.path.isdir(os.path.join('/proc/',
                                                                    str(pid))):
+                        msg = '"' + str(pid) + '": Not a running process'
                         continue
                 else:
                     pid = 0
@@ -1002,6 +1005,7 @@ class Tui(object):
                 break
 
             except ValueError:
+                msg = '"' + str(pid) + '": Not a valid pid'
                 continue
 
     def show_stats(self):
-- 
2.8.4