| libtraceevent(3) |
| ================ |
| |
| NAME |
| ---- |
| tep_read_number_field - Reads a number from raw data. |
| |
| SYNOPSIS |
| -------- |
| [verse] |
| -- |
| *#include <event-parse.h>* |
| |
| int *tep_read_number_field*(struct tep_format_field pass:[*]_field_, const void pass:[*]_data_, unsigned long long pass:[*]_value_); |
| -- |
| |
| DESCRIPTION |
| ----------- |
| 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_. |
| |
| RETURN VALUE |
| ------------ |
| The _tep_read_number_field()_ function retunrs 0 in case of success, or -1 in |
| case of an error. |
| |
| EXAMPLE |
| ------- |
| [source,c] |
| -- |
| #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 */ |
| } |
| } |
| ... |
| -- |
| FILES |
| ----- |
| [verse] |
| -- |
| *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. |
| -- |
| |
| SEE ALSO |
| -------- |
| _libtraceevent(3)_, _trace-cmd(1)_ |
| |
| AUTHOR |
| ------ |
| [verse] |
| -- |
| *Steven Rostedt* <rostedt@goodmis.org>, author of *libtraceevent*. |
| *Tzvetomir Stoyanov* <tz.stoyanov@gmail.com>, author of this man page. |
| -- |
| REPORTING BUGS |
| -------------- |
| Report bugs to <linux-trace-devel@vger.kernel.org> |
| |
| LICENSE |
| ------- |
| libtraceevent is Free Software licensed under the GNU LGPL 2.1 |
| |
| RESOURCES |
| --------- |
| https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git |
