570e23e5a9ebab50763d2543904c8edefaf7894c
[babeltrace.git] / 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
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