NAME¶

libtracecmd - trace-cmd library APIs

SYNOPSIS¶

#include <trace-cmd.h>
Open and close trace file:


        struct tracecmd_input *tracecmd_open(const char *file, int flags);


        struct tracecmd_input *tracecmd_open_fd(int fd, int flags);


        struct tracecmd_input *tracecmd_open_head(const char *file, int flags);


        void tracecmd_close(struct tracecmd_input *handle);
Read tracing records from a trace file:


        int tracecmd_init_data(struct tracecmd_input *handle);


        struct tep_record *tracecmd_read_cpu_first(struct tracecmd_input *handle, int cpu);


        struct tep_record *tracecmd_read_data(struct tracecmd_input *handle, int cpu);


        struct tep_record *tracecmd_read_at(struct tracecmd_input *handle, unsigned long long offset, int *cpu);


        void tracecmd_free_record(struct tep_record *record);


        struct tep_handle *tracecmd_get_tep(struct tracecmd_input *handle);
Read tracing instances from a trace file:


        int tracecmd_buffer_instances(struct tracecmd_input *handle);


        const char *tracecmd_buffer_instance_name(struct tracecmd_input *handle, int indx);


        struct tracecmd_input *tracecmd_buffer_instance_handle(struct tracecmd_input *handle, int indx);
Get traceing peer information from a trace file:


        unsigned long long tracecmd_get_traceid(struct tracecmd_input *handle);


        int tracecmd_get_guest_cpumap(struct tracecmd_input *handle, unsigned long long trace_id, const char **name, int *vcpu_count, const int **cpu_pid);
Control library logs:


        int tracecmd_set_loglevel(enum tep_loglevel level);

DESCRIPTION¶

The libtracecmd(3) library provides APIs to read, parse and write trace-cmd.dat(5) files, recorded with trace-cmd(1) application and containing tracing information from ftrace, the official Linux kernel tracer.

FILES¶

trace-cmd.h


        Header file to include in order to have access to the library APIs.
-ltracecmd


        Linker switch to add when building a program that uses the library.

SEE ALSO¶

libtraceevent(3) libtracefs(3) trace-cmd(1) trace-cmd.dat(5)

AUTHOR¶

Steven Rostedt <rostedt@goodmis.org[1]>
Tzvetomir Stoyanov <tz.stoyanov@gmail.com[2]>

REPORTING BUGS¶

Report bugs to <linux-trace-devel@vger.kernel.org[3]>

LICENSE¶

libtracecmd is Free Software licensed under the GNU LGPL 2.1

RESOURCES¶

https://git.kernel.org/pub/scm/utils/trace-cmd/trace-cmd.git/

COPYING¶

Copyright (C) 2020 VMware, Inc. Free use of this software is granted under the terms of the GNU Public License (GPL).

NOTES¶

1.

rostedt@goodmis.org

2.

tz.stoyanov@gmail.com

3.

linux-trace-devel@vger.kernel.org