bindings/python/examples/example-api-test.py

   1 #!/usr/bin/env python3
   2 # example_api_test.py
   3 #
   4 # Babeltrace example script based on the Babeltrace API test script
   5 #
   6 # Copyright 2012 EfficiOS Inc.
   7 #
   8 # Author: Danny Serres <danny.serres@efficios.com>
   9 #
  10 # Permission is hereby granted, free of charge, to any person obtaining a copy
  11 # of this software and associated documentation files (the "Software"), to deal
  12 # in the Software without restriction, including without limitation the rights
  13 # to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  14 # copies of the Software, and to permit persons to whom the Software is
  15 # furnished to do so, subject to the following conditions:
  16 #
  17 # The above copyright notice and this permission notice shall be included in
  18 # all copies or substantial portions of the Software.
  19
  20 # This example uses the babeltrace python module
  21 # to partially test the api.
  22
  23 import sys
  24 from babeltrace import *
  25
  26 # Check for path arg:
  27 if len(sys.argv) < 2:
  28         raise TypeError("Usage: python example-api-test.py path/to/file")
  29
  30 # Create context and add trace:
  31 ctx = Context()
  32 trace_handle = ctx.add_trace(sys.argv[1], "ctf")
  33 if trace_handle is None:
  34         raise IOError("Error adding trace")
  35
  36 # Listing events
  37 lst = CTFReader.get_event_decl_list(trace_handle, ctx)
  38 print("--- Event list ---")
  39 for item in lst:
  40         print("event : {}".format(item.get_name()))
  41 print("--- Done ---")
  42
  43 # Iter trace
  44 bp = IterPos(SEEK_BEGIN)
  45 ctf_it = CTFReader.Iterator(ctx,bp)
  46 event = ctf_it.read_event()
  47
  48 while(event is not None):
  49         print("TS: {}, {} : {}".format(event.get_timestamp(),
  50                 event.get_cycles(), event.get_name()))
  51
  52         if event.get_name() == "sched_switch":
  53                 prev_field = event.get_field("prev_comm")
  54                 if prev_field is None:
  55                         print("ERROR: Missing prev_comm context info")
  56                 else:
  57                         prev_comm = prev_field[0].get_value()
  58                         if prev_comm is not None:
  59                                 print("sched_switch prev_comm: {}".format(prev_comm))
  60
  61         if event.get_name() == "exit_syscall":
  62                 ret_field = event.get_field("ret")
  63                 if ret_field is None:
  64                         print("ERROR: Unable to extract ret")
  65                 else:
  66                         ret_code = ret_field[0].get_value()
  67                         if ret_code is not None:
  68                                 print("exit_syscall ret: {}".format(ret_code))
  69
  70         ret = ctf_it.next()
  71         if ret < 0:
  72                 break
  73         else:
  74                 event = ctf_it.read_event()
  75
  76 del ctf_it