1*436bf2bcSAndroid Build Coastguard Workerlibtraceevent(3) 2*436bf2bcSAndroid Build Coastguard Worker================ 3*436bf2bcSAndroid Build Coastguard Worker 4*436bf2bcSAndroid Build Coastguard WorkerNAME 5*436bf2bcSAndroid Build Coastguard Worker---- 6*436bf2bcSAndroid Build Coastguard Workertep_parse_header_page - Parses the data stored in the header page. 7*436bf2bcSAndroid Build Coastguard Worker 8*436bf2bcSAndroid Build Coastguard WorkerSYNOPSIS 9*436bf2bcSAndroid Build Coastguard Worker-------- 10*436bf2bcSAndroid Build Coastguard Worker[verse] 11*436bf2bcSAndroid Build Coastguard Worker-- 12*436bf2bcSAndroid Build Coastguard Worker*#include <event-parse.h>* 13*436bf2bcSAndroid Build Coastguard Worker 14*436bf2bcSAndroid Build Coastguard Workerint *tep_parse_header_page*(struct tep_handle pass:[*]_tep_, char pass:[*]_buf_, unsigned long _size_, int _long_size_); 15*436bf2bcSAndroid Build Coastguard Worker-- 16*436bf2bcSAndroid Build Coastguard Worker 17*436bf2bcSAndroid Build Coastguard WorkerDESCRIPTION 18*436bf2bcSAndroid Build Coastguard Worker----------- 19*436bf2bcSAndroid Build Coastguard WorkerThe *tep_parse_header_page()* function parses the header page data from _buf_, 20*436bf2bcSAndroid Build Coastguard Workerand initializes the _tep_, trace event parser context, with it. The buffer 21*436bf2bcSAndroid Build Coastguard Worker_buf_ is with _size_, and is supposed to be copied from 22*436bf2bcSAndroid Build Coastguard Workertracefs/events/header_page. 23*436bf2bcSAndroid Build Coastguard Worker 24*436bf2bcSAndroid Build Coastguard WorkerSome old kernels do not have header page info, in this case the 25*436bf2bcSAndroid Build Coastguard Worker*tep_parse_header_page()* function can be called with _size_ equal to 0. The 26*436bf2bcSAndroid Build Coastguard Worker_tep_ context is initialized with default values. The _long_size_ can be used in 27*436bf2bcSAndroid Build Coastguard Workerthis use case, to set the size of a long integer to be used. 28*436bf2bcSAndroid Build Coastguard Worker 29*436bf2bcSAndroid Build Coastguard WorkerRETURN VALUE 30*436bf2bcSAndroid Build Coastguard Worker------------ 31*436bf2bcSAndroid Build Coastguard WorkerThe *tep_parse_header_page()* function returns 0 in case of success, or -1 32*436bf2bcSAndroid Build Coastguard Workerin case of an error. 33*436bf2bcSAndroid Build Coastguard Worker 34*436bf2bcSAndroid Build Coastguard WorkerEXAMPLE 35*436bf2bcSAndroid Build Coastguard Worker------- 36*436bf2bcSAndroid Build Coastguard Worker[source,c] 37*436bf2bcSAndroid Build Coastguard Worker-- 38*436bf2bcSAndroid Build Coastguard Worker#include <event-parse.h> 39*436bf2bcSAndroid Build Coastguard Worker... 40*436bf2bcSAndroid Build Coastguard Workerstruct tep_handle *tep = tep_alloc(); 41*436bf2bcSAndroid Build Coastguard Worker... 42*436bf2bcSAndroid Build Coastguard Workerchar *buf; 43*436bf2bcSAndroid Build Coastguard Workerint size; 44*436bf2bcSAndroid Build Coastguard Workerbuf = read_file("/sys/kernel/tracing/events/header_page", &size); 45*436bf2bcSAndroid Build Coastguard Workerif (tep_parse_header_page(tep, buf, size, sizeof(unsigned long)) != 0) { 46*436bf2bcSAndroid Build Coastguard Worker /* Failed to parse the header page */ 47*436bf2bcSAndroid Build Coastguard Worker} 48*436bf2bcSAndroid Build Coastguard Worker... 49*436bf2bcSAndroid Build Coastguard Worker-- 50*436bf2bcSAndroid Build Coastguard Worker 51*436bf2bcSAndroid Build Coastguard WorkerFILES 52*436bf2bcSAndroid Build Coastguard Worker----- 53*436bf2bcSAndroid Build Coastguard Worker[verse] 54*436bf2bcSAndroid Build Coastguard Worker-- 55*436bf2bcSAndroid Build Coastguard Worker*event-parse.h* 56*436bf2bcSAndroid Build Coastguard Worker Header file to include in order to have access to the library APIs. 57*436bf2bcSAndroid Build Coastguard Worker*-ltraceevent* 58*436bf2bcSAndroid Build Coastguard Worker Linker switch to add when building a program that uses the library. 59*436bf2bcSAndroid Build Coastguard Worker-- 60*436bf2bcSAndroid Build Coastguard Worker 61*436bf2bcSAndroid Build Coastguard WorkerSEE ALSO 62*436bf2bcSAndroid Build Coastguard Worker-------- 63*436bf2bcSAndroid Build Coastguard Worker*libtraceevent*(3), *trace-cmd*(1) 64*436bf2bcSAndroid Build Coastguard Worker 65*436bf2bcSAndroid Build Coastguard WorkerAUTHOR 66*436bf2bcSAndroid Build Coastguard Worker------ 67*436bf2bcSAndroid Build Coastguard Worker[verse] 68*436bf2bcSAndroid Build Coastguard Worker-- 69*436bf2bcSAndroid Build Coastguard Worker*Steven Rostedt* <[email protected]>, author of *libtraceevent*. 70*436bf2bcSAndroid Build Coastguard Worker*Tzvetomir Stoyanov* <[email protected]>, author of this man page. 71*436bf2bcSAndroid Build Coastguard Worker-- 72*436bf2bcSAndroid Build Coastguard WorkerREPORTING BUGS 73*436bf2bcSAndroid Build Coastguard Worker-------------- 74*436bf2bcSAndroid Build Coastguard WorkerReport bugs to <[email protected]> 75*436bf2bcSAndroid Build Coastguard Worker 76*436bf2bcSAndroid Build Coastguard WorkerLICENSE 77*436bf2bcSAndroid Build Coastguard Worker------- 78*436bf2bcSAndroid Build Coastguard Workerlibtraceevent is Free Software licensed under the GNU LGPL 2.1 79*436bf2bcSAndroid Build Coastguard Worker 80*436bf2bcSAndroid Build Coastguard WorkerRESOURCES 81*436bf2bcSAndroid Build Coastguard Worker--------- 82*436bf2bcSAndroid Build Coastguard Workerhttps://git.kernel.org/pub/scm/libs/libtrace/libtraceevent.git/ 83