4 # Babeltrace example script based on the Babeltrace API test script
6 # Copyright 2012 EfficiOS Inc.
8 # Author: Danny Serres <danny.serres@efficios.com>
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:
17 # The above copyright notice and this permission notice shall be included in
18 # all copies or substantial portions of the Software.
20 # This example uses the babeltrace python module
21 # to partially test the api.
24 from babeltrace
import *
28 raise TypeError("Usage: python example-api-test.py path/to/file")
30 # Create context and add trace:
32 trace_handle
= ctx
.add_trace(sys
.argv
[1], "ctf")
33 if trace_handle
is None:
34 raise IOError("Error adding trace")
37 lst
= ctf
.get_event_decl_list(trace_handle
, ctx
)
38 print("--- Event list ---")
40 print("event : {}".format(item
.get_name()))
44 bp
= IterPos(SEEK_BEGIN
)
45 ctf_it
= ctf
.Iterator(ctx
,bp
)
46 event
= ctf_it
.read_event()
48 while(event
is not None):
49 print("TS: {}, {} : {}".format(event
.get_timestamp(),
50 event
.get_cycles(), event
.get_name()))
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()
58 print("ERROR: Missing prev_comm context info")
60 print("sched_switch prev_comm: {}".format(prev_comm
))
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()
68 print("ERROR: Unable to extract ret")
70 print("exit_syscall ret: {}".format(ret_code
))
76 event
= ctf_it
.read_event()
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