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81 lines
1.8 KiB
81 lines
1.8 KiB
libtraceevent(3) |
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================ |
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NAME |
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---- |
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tep_read_number_field - Reads a number from raw data. |
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SYNOPSIS |
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-------- |
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[verse] |
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-- |
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*#include <event-parse.h>* |
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int *tep_read_number_field*(struct tep_format_field pass:[*]_field_, const void pass:[*]_data_, unsigned long long pass:[*]_value_); |
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-- |
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DESCRIPTION |
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----------- |
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The _tep_read_number_field()_ function reads the value of the _field_ from the |
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raw _data_ and stores it in the _value_. The function sets the _value_ according |
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to the endianness of the raw data and the current machine and stores it in |
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_value_. |
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RETURN VALUE |
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------------ |
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The _tep_read_number_field()_ function retunrs 0 in case of success, or -1 in |
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case of an error. |
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EXAMPLE |
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------- |
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[source,c] |
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#include <event-parse.h> |
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... |
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struct tep_handle *tep = tep_alloc(); |
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... |
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struct tep_event *event = tep_find_event_by_name(tep, "timer", "hrtimer_start"); |
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... |
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void process_record(struct tep_record *record) |
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{ |
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unsigned long long pid; |
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struct tep_format_field *field_pid = tep_find_common_field(event, "common_pid"); |
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if (tep_read_number_field(field_pid, record->data, &pid) != 0) { |
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/* Failed to get "common_pid" value */ |
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} |
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} |
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... |
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-- |
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FILES |
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----- |
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[verse] |
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-- |
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*event-parse.h* |
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Header file to include in order to have access to the library APIs. |
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*-ltraceevent* |
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Linker switch to add when building a program that uses the library. |
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-- |
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SEE ALSO |
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-------- |
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_libtraceevent(3)_, _trace-cmd(1)_ |
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AUTHOR |
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------ |
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[verse] |
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-- |
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*Steven Rostedt* <[email protected]>, author of *libtraceevent*. |
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*Tzvetomir Stoyanov* <[email protected]>, author of this man page. |
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-- |
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REPORTING BUGS |
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-------------- |
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Report bugs to <[email protected]> |
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LICENSE |
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------- |
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libtraceevent is Free Software licensed under the GNU LGPL 2.1 |
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RESOURCES |
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--------- |
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https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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