projects / babeltrace.git / blame
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|---|---|---|
| 24a3136a DS |
1 | # example_api_test.py |
| 2 | # | |
| 3 | # Babeltrace example script based on the Babeltrace API test script | |
| 4 | # | |
| 5 | # Copyright 2012 EfficiOS Inc. | |
| 6 | # | |
| 7 | # Author: Danny Serres <danny.serres@efficios.com> | |
| 8 | # | |
| 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: | |
| 15 | # | |
| 16 | # The above copyright notice and this permission notice shall be included in | |
| 17 | # all copies or substantial portions of the Software. | |
| 18 | ||
| 19 | # This example uses the babeltrace python module | |
| 20 | # to partially test the api. | |
| 21 | ||
| 22 | import sys | |
| 23 | from babeltrace import * | |
| 24 | ||
| 25 | # Check for path arg: | |
| 26 | if len(sys.argv) < 2: | |
| 27 | raise TypeError("Usage: python example-api-test.py path/to/file") | |
| 28 | ||
| 29 | # Create context and add trace: | |
| 30 | ctx = Context() | |
| 31 | trace_handle = ctx.add_trace(sys.argv[1], "ctf") | |
| 32 | if trace_handle is None: | |
| 33 | raise IOError("Error adding trace") | |
| 34 | ||
| 35 | # Listing events | |
| 36 | lst = ctf.get_event_decl_list(trace_handle, ctx) | |
| 37 | print("--- Event list ---") | |
| 38 | for item in lst: | |
| 39 | print("event : {}".format(item.get_name())) | |
| 40 | print("--- Done ---") | |
| 41 | ||
| 42 | # Iter trace | |
| 43 | bp = IterPos(SEEK_BEGIN) | |
| 44 | ctf_it = ctf.Iterator(ctx,bp) | |
| 45 | event = ctf_it.read_event() | |
| 46 | ||
| 47 | while(event is not None): | |
| 48 | print("TS: {}, {} : {}".format(event.get_timestamp(), | |
| 49 | event.get_cycles(), event.get_name())) | |
| 50 | ||
| 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() | |
| 55 | ||
| 56 | if ctf.field_error(): | |
| 57 | print("ERROR: Missing prev_comm context info") | |
| 58 | else: | |
| 59 | print("sched_switch prev_comm: {}".format(prev_comm)) | |
| 60 | ||
| 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() | |
| 65 | ||
| 66 | if ctf.field_error(): | |
| 67 | print("ERROR: Unable to extract ret") | |
| 68 | else: | |
| 69 | print("exit_syscall ret: {}".format(ret_code)) | |
| 70 | ||
| 71 | ret = ctf_it.next() | |
| 72 | if ret < 0: | |
| 73 | break | |
| 74 | else: | |
| 75 | event = ctf_it.read_event() | |
| 76 | ||
| 77 | del ctf_it |