3 # Babeltrace example script based on the Babeltrace API test script
5 # Copyright 2012 EfficiOS Inc.
7 # Author: Danny Serres <danny.serres@efficios.com>
9 # Permission is hereby granted, free of charge, to any person obtaining a copy
10 # of this software and associated documentation files (the "Software"), to deal
11 # in the Software without restriction, including without limitation the rights
12 # to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
13 # copies of the Software, and to permit persons to whom the Software is
14 # furnished to do so, subject to the following conditions:
16 # The above copyright notice and this permission notice shall be included in
17 # all copies or substantial portions of the Software.
19 # This example uses the babeltrace python module
20 # to partially test the api.
23 from babeltrace
import *
27 raise TypeError("Usage: python example-api-test.py path/to/file")
29 # Create context and add trace:
31 trace_handle
= ctx
.add_trace(sys
.argv
[1], "ctf")
32 if trace_handle
is None:
33 raise IOError("Error adding trace")
36 lst
= ctf
.get_event_decl_list(trace_handle
, ctx
)
37 print("--- Event list ---")
39 print("event : {}".format(item
.get_name()))
43 bp
= IterPos(SEEK_BEGIN
)
44 ctf_it
= ctf
.Iterator(ctx
,bp
)
45 event
= ctf_it
.read_event()
47 while(event
is not None):
48 print("TS: {}, {} : {}".format(event
.get_timestamp(),
49 event
.get_cycles(), event
.get_name()))
51 if event
.get_name() == "sched_switch":
52 sco
= event
.get_top_level_scope(ctf
.scope
.EVENT_FIELDS
)
53 prev_field
= event
.get_field(sco
, "_prev_comm")
54 prev_comm
= prev_field
.get_char_array()
57 print("ERROR: Missing prev_comm context info")
59 print("sched_switch prev_comm: {}".format(prev_comm
))
61 if event
.get_name() == "exit_syscall":
62 sco
= event
.get_top_level_scope(ctf
.scope
.EVENT_FIELDS
)
63 ret_field
= event
.get_field(sco
, "_ret")
64 ret_code
= ret_field
.get_int64()
67 print("ERROR: Unable to extract ret")
69 print("exit_syscall ret: {}".format(ret_code
))
75 event
= ctf_it
.read_event()
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