tests/regression/ust/fork/test_fork.py

   1 #!/usr/bin/env python3
   2 #
   3 # Copyright (C) - 2013 Jérémie Galarneau <jeremie.galarneau@efficios.com>
   4 #
   5 # This program is free software; you can redistribute it and/or modify it
   6 # under the terms of the GNU General Public License, version 2 only, as
   7 # published by the Free Software Foundation.
   8 #
   9 # This program is distributed in the hope that it will be useful, but WITHOUT
  10 # ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11 # FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  12 # more details.
  13 #
  14 # You should have received a copy of the GNU General Public License along with
  15 # this program; if not, write to the Free Software Foundation, Inc., 51
  16 # Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  17
  18 import os
  19 import subprocess
  20 import re
  21 import shutil
  22 import sys
  23
  24 test_path = os.path.dirname(os.path.abspath(__file__)) + "/"
  25 test_utils_path = test_path
  26 for i in range(4):
  27     test_utils_path = os.path.dirname(test_utils_path)
  28 test_utils_path = test_utils_path + "/utils"
  29 sys.path.append(test_utils_path)
  30 from test_utils import *
  31
  32
  33 NR_TESTS = 6
  34 current_test = 1
  35 print("1..{0}".format(NR_TESTS))
  36
  37 # Check if a sessiond is running... bail out if none found.
  38 if session_daemon_alive() == 0:
  39     bail("No sessiond running. Please make sure you are running this test with the \"run\" shell script and verify that the lttng tools are properly installed.")
  40
  41 session_info = create_session()
  42 enable_ust_tracepoint_event(session_info, "ust_tests_fork*")
  43 start_session(session_info)
  44
  45 fork_process = subprocess.Popen([test_path + "fork", test_path + "fork2"], stdout=subprocess.PIPE, stderr=subprocess.PIPE)
  46 parent_pid = -1
  47 child_pid = -1
  48 for line in fork_process.stdout:
  49     line = line.decode('utf-8').replace("\n", "")
  50     match = re.search(r"child_pid (\d+)", line)
  51     if match:
  52         child_pid = match.group(1)
  53     match = re.search(r"parent_pid (\d+)", line)
  54     if match:
  55         parent_pid = match.group(1)
  56
  57 fork_process.wait()
  58
  59 print_test_result(fork_process.returncode == 0, current_test, "Fork test application exited normally")
  60 current_test += 1
  61
  62 stop_session(session_info)
  63
  64 # Check both events (normal exit and suicide messages) are present in the resulting trace
  65 try:
  66     babeltrace_process = subprocess.Popen(["babeltrace", session_info.trace_path], stdout=subprocess.PIPE, stderr=subprocess.PIPE)
  67 except FileNotFoundError:
  68     bail("Could not open babeltrace. Please make sure it is installed.", session_info)
  69
  70 event_lines = []
  71 for event_line in babeltrace_process.stdout:
  72     event_line = event_line.decode('utf-8').replace("\n", "")
  73     if re.search(r"warning", event_line) is not None or re.search(r"error", event_line) is not None:
  74         print( "# " + event_line )
  75     else:
  76         event_lines.append(event_line)
  77
  78 babeltrace_process.wait()
  79
  80 print_test_result(babeltrace_process.returncode == 0, current_test, "Resulting trace is readable")
  81 current_test += 1
  82
  83 if babeltrace_process.returncode != 0:
  84     bail("Unreadable trace; can't proceed with analysis.", session_info)
  85
  86 event_before_fork = False
  87 event_after_fork_parent = False
  88 event_after_fork_child = False
  89 event_after_exec = False
  90
  91 for event_line in event_lines:
  92     match = re.search(r".*pid = (\d+)", event_line)
  93     if match is not None:
  94         event_pid = match.group(1)
  95     else:
  96         continue
  97
  98     if re.search(r"before_fork", event_line):
  99         event_before_fork = (event_pid == parent_pid)
 100     if re.search(r"after_fork_parent", event_line):
 101         event_after_fork_parent = (event_pid == parent_pid)
 102     if re.search(r"after_fork_child", event_line):
 103         event_after_fork_child = (event_pid == child_pid)
 104     if re.search(r"after_exec", event_line):
 105         event_after_exec = (event_pid == child_pid)
 106
 107 print_test_result(event_before_fork, current_test, "before_fork event logged by parent process found in trace")
 108 current_test += 1
 109 print_test_result(event_after_fork_parent, current_test, "after_fork_parent event logged by parent process found in trace")
 110 current_test += 1
 111 print_test_result(event_after_fork_child, current_test, "after_fork_child event logged by child process found in trace")
 112 current_test += 1
 113 print_test_result(event_after_exec, current_test, "after_exec event logged by child process found in trace")
 114 current_test += 1
 115
 116 shutil.rmtree(session_info.tmp_directory)