tep_read_number_field(3) — Страница руководства Linux

LIBTRACEEVENT(3)          libtraceevent Manual          LIBTRACEEVENT(3)

ИМЯ

       tep_read_number_field - Reads a number from raw data.

СИНТАКСИС

       #include <event-parse.h>

       int tep_read_number_field(struct tep_format_field *field, const void *data, unsigned long long *value);

ОПИСАНИЕ

       The tep_read_number_field() function reads the value of the field
       from the raw data and stores it in the value. The function sets
       the value according to the endianness of the raw data and the
       current machine and stores it in value.

ЗНАЧЕНИЕ, ВОЗВРАЩАЕМОЕ ФУНКЦИЕЙ

       The tep_read_number_field() function retunrs 0 in case of
       success, or -1 in case of an error.

ПРИМЕР

           #include <event-parse.h>
           ...
           struct tep_handle *tep = tep_alloc();
           ...
           struct tep_event *event = tep_find_event_by_name(tep, "timer", "hrtimer_start");
           ...
           void process_record(struct tep_record *record)
           {
                   unsigned long long pid;
                   struct tep_format_field *field_pid = tep_find_common_field(event, "common_pid");

                   if (tep_read_number_field(field_pid, record->data, &pid) != 0) {
                           /* Failed to get "common_pid" value */
                   }
           }
           ...

ФАЙЛЫ

           event-parse.h
                   Header file to include in order to have access to the library APIs.
           -ltraceevent
                   Linker switch to add when building a program that uses the library.

СМОТРИТЕ ТАКЖЕ

       libtraceevent(3), trace-cmd(1)

АВТОР

           Steven Rostedt <rostedt@goodmis.org[1]>, author of libtraceevent.
           Tzvetomir Stoyanov <tz.stoyanov@gmail.com[2]>, author of this man page.

СООБЩЕНИЕ ОБ ОШИБКАХ

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

ЛИЦЕНЗИЯ

       libtraceevent is Free Software licensed under the GNU LGPL 2.1

РЕСУРСЫ

       https://git.kernel.org/pub/scm/libs/libtrace/libtraceevent.git/ 

ПРИМЕЧАНИЯ

        1. rostedt@goodmis.org
           mailto:rostedt@goodmis.org

        2. tz.stoyanov@gmail.com
           mailto:tz.stoyanov@gmail.com

        3. linux-trace-devel@vger.kernel.org
           mailto:linux-trace-devel@vger.kernel.org

КОЛОФОН

       This page is part of the libtraceevent (Linux kernel trace event
       library) project.  Information about the project can be found at
       ⟨https://www.trace-cmd.org/⟩.  If you have a bug report for this
       manual page, see ⟨https://www.trace-cmd.org/⟩.  This page was
       obtained from the project's upstream Git repository
       ⟨https://git.kernel.org/pub/scm/libs/libtrace/libtraceevent.git⟩
       on 2024-06-14.  (At that time, the date of the most recent commit
       that was found in the repository was 2024-05-17.)  If you
       discover any rendering problems in this HTML version of the page,
       or you believe there is a better or more up-to-date source for
       the page, or you have corrections or improvements to the
       information in this COLOPHON (which is not part of the original
       manual page), send a mail to man-pages@man7.org

libtraceevent 1.7.3            09/24/2023               LIBTRACEEVENT(3)