From 213db13fcc39a098a7d91f85c16e9c498be35a7c Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Pavel=20=C5=A0imerda?= <psimerda@redhat.com>
Date: Thu, 12 May 2016 14:41:23 +0200
Subject: [PATCH] ignore `ESRCH` on processes to be killed

Sometimes a debugged process is already gone when python-ptrace performs
steps to terminate it. In that case we need to gracefully ignore any
`ESRCH` errors.

This issue was discovered when running network-testing[1] and resulted
in the following traceback.

    Traceback (most recent call last):
      File "./test-client-server", line 5, in <module>
        main()
      File "/home/pavlix/oss/network-testing/network_testing/client_server.py", line 55, in main
        suite.run()
      File "/home/pavlix/oss/network-testing/network_testing/test_suite.py", line 431, in run
        testcase.run()
      File "/home/pavlix/oss/network-testing/network_testing/test_suite.py", line 391, in run
        scenario.run()
      File "/home/pavlix/oss/network-testing/network_testing/test_suite.py", line 172, in run
        debugger.quit()
      File "/home/pavlix/oss/network-testing/network_testing/debug.py", line 198, in quit
        super(SyscallDebugger, self).quit()
      File "/usr/lib64/python3.4/site-packages/ptrace/debugger/debugger.py", line 105, in quit
        process.terminate()
      File "/usr/lib64/python3.4/site-packages/ptrace/debugger/process.py", line 330, in terminate
        self.waitExit()
      File "/usr/lib64/python3.4/site-packages/ptrace/debugger/process.py", line 351, in waitExit
        self.cont(signum)
      File "/usr/lib64/python3.4/site-packages/ptrace/debugger/process.py", line 717, in cont
        ptrace_cont(self.pid, signum)
      File "/usr/lib64/python3.4/site-packages/ptrace/binding/func.py", line 212, in ptrace_cont
        ptrace(PTRACE_CONT, pid, 0, signum)
      File "/usr/lib64/python3.4/site-packages/ptrace/binding/func.py", line 148, in ptrace
        raise PtraceError(message, errno=errno, pid=pid)
    ptrace.error.PtraceError: ptrace(cmd=7, pid=12894, 0, 133) error #3: No such process

[1]: https://github.com/pavlix/network-testing
---
 ptrace/debugger/process.py | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/ptrace/debugger/process.py b/ptrace/debugger/process.py
index a759d2b..542ac2a 100644
--- a/ptrace/debugger/process.py
+++ b/ptrace/debugger/process.py
@@ -723,7 +723,11 @@ def dumpRegs(self, log=None):
 
     def cont(self, signum=0):
         signum = self.filterSignal(signum)
-        ptrace_cont(self.pid, signum)
+        try:
+            ptrace_cont(self.pid, signum)
+        except PtraceError as error:
+            if error.errno != 3:
+                raise
         self.is_stopped = False
 
     def setoptions(self, options):