1LIBTRACECMD(3) libtracefs Manual LIBTRACECMD(3)
2
6 libtracecmd - trace-cmd library APIs
7
9 #include <trace-cmd.h>
10 Open and close trace file:
12 struct tracecmd_input *tracecmd_open(const char *file, int flags);
13 struct tracecmd_input *tracecmd_open_fd(int fd, int flags);
14 struct tracecmd_input *tracecmd_open_head(const char *file, int flags);
15 void tracecmd_close(struct tracecmd_input *handle);
16 void tracecmd_set_private(struct tracecmd_input *handle, void *data);
17 void *tracecmd_get_private(struct tracecmd_input *handle);
18 Read tracing records from a trace file:
20 int tracecmd_init_data(struct tracecmd_input *handle);
21 struct tep_record *tracecmd_read_cpu_first(struct tracecmd_input *handle, int cpu);
22 struct tep_record *tracecmd_read_data(struct tracecmd_input *handle, int cpu);
23 struct tep_record *tracecmd_read_at(struct tracecmd_input *handle, unsigned long long offset, int *cpu);
24 void tracecmd_free_record(struct tep_record *record);
25 struct tep_handle *tracecmd_get_tep(struct tracecmd_input *handle);
26 Iterating over events in a trace file:
28 int tracecmd_iterate_events(struct tracecmd_input *handle,
29 cpu_set_t *cpus, int cpu_size,
30 int (*callback)(struct tracecmd_input *,
31 struct tep_record *,
32 int, void *),
33 void *callback_data);
34 int tracecmd_iterate_events_multi(struct tracecmd_input **handles,
35 int nr_handles,
36 int (*callback)(struct tracecmd_input *,
37 struct tep_record *,
38 int, void *),
39 void *callback_data);
40 int tracecmd_follow_event(struct tracecmd_input *handle,
41 const char *system, const char *event_name,
42 int (*callback)(struct tracecmd_input *,
43 struct tep_event *,
44 struct tep_record *,
45 int, void *),
46 void *callback_data);
47 struct tracecmd_filter *tracecmd_filter_add(struct tracecmd_input handle,
48 const char *filter_str, bool neg);
49 Read tracing instances from a trace file:
51 int *tracecmd_buffer_instances(struct tracecmd_input *handle);
52 const char *tracecmd_buffer_instance_name(struct tracecmd_input *handle, int indx);
53 struct tracecmd_input *tracecmd_buffer_instance_handle(struct tracecmd_input *handle, int indx);
54 Handle time stamps from a trace file:
56 unsigned long long tracecmd_get_first_ts(struct tracecmd_input *handle);
57 void tracecmd_add_ts_offset(struct tracecmd_input *handle, long long offset);
58 Get traceing peer information from a trace file:
60 unsigned long long tracecmd_get_traceid(struct tracecmd_input *handle);
61 int tracecmd_get_guest_cpumap(struct tracecmd_input *handle, unsigned long long trace_id, const char **name, int *vcpu_count, const int **cpu_pid);
62 Mapping host and guest trace files:
64 int tracecmd_map_vcpus(struct tracecmd_input **handles, int nr_handles);
65 struct tracecmd_cpu_map *tracecmd_get_cpu_map(struct tracecmd_input *handle, int cpu);
66 struct tracecmd_cpu_map *tracecmd_map_find_by_host_pid(struct tracecmd_input *handle,
67 int host_pid);
68 int tracecmd_map_get_host_pid(struct tracecmd_cpu_map *map);
69 struct tracecmd_input *tracecmd_map_get_guest(struct tracecmd_cpu_map *map);
70 void tracecmd_map_set_private(struct tracecmd_cpu_map *map, void *priv);
71 void *tracecmd_map_get_private(struct tracecmd_cpu_map *map);
72 Control library logs:
74 int tracecmd_set_loglevel(enum tep_loglevel level);
75
77 The libtracecmd(3) library provides APIs to read, parse and write
78 trace-cmd.dat(5) files, recorded with trace-cmd(1) application and
79 containing tracing information from ftrace, the official Linux kernel
80 tracer.
81
83 trace-cmd.h
84 Header file to include in order to have access to the library APIs.
85 -ltracecmd
86 Linker switch to add when building a program that uses the library.
87
89 libtraceevent(3) libtracefs(3) trace-cmd(1) trace-cmd.dat(5)
90
92 Steven Rostedt <rostedt@goodmis.org[1]>
93 Tzvetomir Stoyanov <tz.stoyanov@gmail.com[2]>
94
96 Report bugs to <linux-trace-devel@vger.kernel.org[3]>
97
99 libtracecmd is Free Software licensed under the GNU LGPL 2.1
100
102 https://git.kernel.org/pub/scm/utils/trace-cmd/trace-cmd.git/
103
105 Copyright (C) 2020 VMware, Inc. Free use of this software is granted
106 under the terms of the GNU Public License (GPL).
107
109 1. rostedt@goodmis.org
110 mailto:rostedt@goodmis.org
111 2. tz.stoyanov@gmail.com
113 mailto:tz.stoyanov@gmail.com
114 3. linux-trace-devel@vger.kernel.org
116 mailto:linux-trace-devel@vger.kernel.org
117libtracefs 10/11/2022 LIBTRACECMD(3)