1*4882a593Smuzhiyunlibtraceevent(3) 2*4882a593Smuzhiyun================ 3*4882a593Smuzhiyun 4*4882a593SmuzhiyunNAME 5*4882a593Smuzhiyun---- 6*4882a593Smuzhiyuntep_parse_header_page - Parses the data stored in the header page. 7*4882a593Smuzhiyun 8*4882a593SmuzhiyunSYNOPSIS 9*4882a593Smuzhiyun-------- 10*4882a593Smuzhiyun[verse] 11*4882a593Smuzhiyun-- 12*4882a593Smuzhiyun*#include <event-parse.h>* 13*4882a593Smuzhiyun 14*4882a593Smuzhiyunint *tep_parse_header_page*(struct tep_handle pass:[*]_tep_, char pass:[*]_buf_, unsigned long _size_, int _long_size_); 15*4882a593Smuzhiyun-- 16*4882a593Smuzhiyun 17*4882a593SmuzhiyunDESCRIPTION 18*4882a593Smuzhiyun----------- 19*4882a593SmuzhiyunThe _tep_parse_header_page()_ function parses the header page data from _buf_, 20*4882a593Smuzhiyunand initializes the _tep_, trace event parser context, with it. The buffer 21*4882a593Smuzhiyun_buf_ is with _size_, and is supposed to be copied from 22*4882a593Smuzhiyuntracefs/events/header_page. 23*4882a593Smuzhiyun 24*4882a593SmuzhiyunSome old kernels do not have header page info, in this case the 25*4882a593Smuzhiyun_tep_parse_header_page()_ function can be called with _size_ equal to 0. The 26*4882a593Smuzhiyun_tep_ context is initialized with default values. The _long_size_ can be used in 27*4882a593Smuzhiyunthis use case, to set the size of a long integer to be used. 28*4882a593Smuzhiyun 29*4882a593SmuzhiyunRETURN VALUE 30*4882a593Smuzhiyun------------ 31*4882a593SmuzhiyunThe _tep_parse_header_page()_ function returns 0 in case of success, or -1 32*4882a593Smuzhiyunin case of an error. 33*4882a593Smuzhiyun 34*4882a593SmuzhiyunEXAMPLE 35*4882a593Smuzhiyun------- 36*4882a593Smuzhiyun[source,c] 37*4882a593Smuzhiyun-- 38*4882a593Smuzhiyun#include <event-parse.h> 39*4882a593Smuzhiyun... 40*4882a593Smuzhiyunstruct tep_handle *tep = tep_alloc(); 41*4882a593Smuzhiyun... 42*4882a593Smuzhiyunchar *buf; 43*4882a593Smuzhiyunint size; 44*4882a593Smuzhiyunbuf = read_file("/sys/kernel/tracing/events/header_page", &size); 45*4882a593Smuzhiyunif (tep_parse_header_page(tep, buf, size, sizeof(unsigned long)) != 0) { 46*4882a593Smuzhiyun /* Failed to parse the header page */ 47*4882a593Smuzhiyun} 48*4882a593Smuzhiyun... 49*4882a593Smuzhiyun-- 50*4882a593Smuzhiyun 51*4882a593SmuzhiyunFILES 52*4882a593Smuzhiyun----- 53*4882a593Smuzhiyun[verse] 54*4882a593Smuzhiyun-- 55*4882a593Smuzhiyun*event-parse.h* 56*4882a593Smuzhiyun Header file to include in order to have access to the library APIs. 57*4882a593Smuzhiyun*-ltraceevent* 58*4882a593Smuzhiyun Linker switch to add when building a program that uses the library. 59*4882a593Smuzhiyun-- 60*4882a593Smuzhiyun 61*4882a593SmuzhiyunSEE ALSO 62*4882a593Smuzhiyun-------- 63*4882a593Smuzhiyun_libtraceevent(3)_, _trace-cmd(1)_ 64*4882a593Smuzhiyun 65*4882a593SmuzhiyunAUTHOR 66*4882a593Smuzhiyun------ 67*4882a593Smuzhiyun[verse] 68*4882a593Smuzhiyun-- 69*4882a593Smuzhiyun*Steven Rostedt* <rostedt@goodmis.org>, author of *libtraceevent*. 70*4882a593Smuzhiyun*Tzvetomir Stoyanov* <tz.stoyanov@gmail.com>, author of this man page. 71*4882a593Smuzhiyun-- 72*4882a593SmuzhiyunREPORTING BUGS 73*4882a593Smuzhiyun-------------- 74*4882a593SmuzhiyunReport bugs to <linux-trace-devel@vger.kernel.org> 75*4882a593Smuzhiyun 76*4882a593SmuzhiyunLICENSE 77*4882a593Smuzhiyun------- 78*4882a593Smuzhiyunlibtraceevent is Free Software licensed under the GNU LGPL 2.1 79*4882a593Smuzhiyun 80*4882a593SmuzhiyunRESOURCES 81*4882a593Smuzhiyun--------- 82*4882a593Smuzhiyunhttps://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 83