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300b4c33 | 1 | #!/usr/bin/env python3 |
24a3136a | 2 | # example_api_test.py |
300b4c33 | 3 | # |
24a3136a | 4 | # Babeltrace example script based on the Babeltrace API test script |
300b4c33 | 5 | # |
24a3136a | 6 | # Copyright 2012 EfficiOS Inc. |
300b4c33 | 7 | # |
24a3136a | 8 | # Author: Danny Serres <danny.serres@efficios.com> |
300b4c33 | 9 | # |
24a3136a DS |
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: | |
300b4c33 | 16 | # |
24a3136a DS |
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 = ctf.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 = ctf.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 | sco = event.get_top_level_scope(ctf.scope.EVENT_FIELDS) | |
54 | prev_field = event.get_field(sco, "_prev_comm") | |
55 | prev_comm = prev_field.get_char_array() | |
56 | ||
57 | if ctf.field_error(): | |
58 | print("ERROR: Missing prev_comm context info") | |
59 | else: | |
60 | print("sched_switch prev_comm: {}".format(prev_comm)) | |
61 | ||
62 | if event.get_name() == "exit_syscall": | |
63 | sco = event.get_top_level_scope(ctf.scope.EVENT_FIELDS) | |
64 | ret_field = event.get_field(sco, "_ret") | |
65 | ret_code = ret_field.get_int64() | |
66 | ||
67 | if ctf.field_error(): | |
68 | print("ERROR: Unable to extract ret") | |
69 | else: | |
70 | print("exit_syscall ret: {}".format(ret_code)) | |
71 | ||
72 | ret = ctf_it.next() | |
73 | if ret < 0: | |
74 | break | |
75 | else: | |
76 | event = ctf_it.read_event() | |
77 | ||
78 | del ctf_it |