1*4882a593Smuzhiyunlibtraceevent(3) 2*4882a593Smuzhiyun================ 3*4882a593Smuzhiyun 4*4882a593SmuzhiyunNAME 5*4882a593Smuzhiyun---- 6*4882a593Smuzhiyuntep_read_number - Reads a number from raw data. 7*4882a593Smuzhiyun 8*4882a593SmuzhiyunSYNOPSIS 9*4882a593Smuzhiyun-------- 10*4882a593Smuzhiyun[verse] 11*4882a593Smuzhiyun-- 12*4882a593Smuzhiyun*#include <event-parse.h>* 13*4882a593Smuzhiyun 14*4882a593Smuzhiyununsigned long long *tep_read_number*(struct tep_handle pass:[*]_tep_, const void pass:[*]_ptr_, int _size_); 15*4882a593Smuzhiyun-- 16*4882a593Smuzhiyun 17*4882a593SmuzhiyunDESCRIPTION 18*4882a593Smuzhiyun----------- 19*4882a593SmuzhiyunThe _tep_read_number()_ function reads an integer from raw data, taking into 20*4882a593Smuzhiyunaccount the endianness of the raw data and the current host. The _tep_ argument 21*4882a593Smuzhiyunis the trace event parser context. The _ptr_ is a pointer to the raw data, where 22*4882a593Smuzhiyunthe integer is, and the _size_ is the size of the integer. 23*4882a593Smuzhiyun 24*4882a593SmuzhiyunRETURN VALUE 25*4882a593Smuzhiyun------------ 26*4882a593SmuzhiyunThe _tep_read_number()_ function returns the integer in the byte order of 27*4882a593Smuzhiyunthe current host. In case of an error, 0 is returned. 28*4882a593Smuzhiyun 29*4882a593SmuzhiyunEXAMPLE 30*4882a593Smuzhiyun------- 31*4882a593Smuzhiyun[source,c] 32*4882a593Smuzhiyun-- 33*4882a593Smuzhiyun#include <event-parse.h> 34*4882a593Smuzhiyun... 35*4882a593Smuzhiyunstruct tep_handle *tep = tep_alloc(); 36*4882a593Smuzhiyun... 37*4882a593Smuzhiyunvoid process_record(struct tep_record *record) 38*4882a593Smuzhiyun{ 39*4882a593Smuzhiyun int offset = 24; 40*4882a593Smuzhiyun int data = tep_read_number(tep, record->data + offset, 4); 41*4882a593Smuzhiyun 42*4882a593Smuzhiyun /* Read the 4 bytes at the offset 24 of data as an integer */ 43*4882a593Smuzhiyun} 44*4882a593Smuzhiyun... 45*4882a593Smuzhiyun-- 46*4882a593Smuzhiyun 47*4882a593SmuzhiyunFILES 48*4882a593Smuzhiyun----- 49*4882a593Smuzhiyun[verse] 50*4882a593Smuzhiyun-- 51*4882a593Smuzhiyun*event-parse.h* 52*4882a593Smuzhiyun Header file to include in order to have access to the library APIs. 53*4882a593Smuzhiyun*-ltraceevent* 54*4882a593Smuzhiyun Linker switch to add when building a program that uses the library. 55*4882a593Smuzhiyun-- 56*4882a593Smuzhiyun 57*4882a593SmuzhiyunSEE ALSO 58*4882a593Smuzhiyun-------- 59*4882a593Smuzhiyun_libtraceevent(3)_, _trace-cmd(1)_ 60*4882a593Smuzhiyun 61*4882a593SmuzhiyunAUTHOR 62*4882a593Smuzhiyun------ 63*4882a593Smuzhiyun[verse] 64*4882a593Smuzhiyun-- 65*4882a593Smuzhiyun*Steven Rostedt* <rostedt@goodmis.org>, author of *libtraceevent*. 66*4882a593Smuzhiyun*Tzvetomir Stoyanov* <tz.stoyanov@gmail.com>, author of this man page. 67*4882a593Smuzhiyun-- 68*4882a593SmuzhiyunREPORTING BUGS 69*4882a593Smuzhiyun-------------- 70*4882a593SmuzhiyunReport bugs to <linux-trace-devel@vger.kernel.org> 71*4882a593Smuzhiyun 72*4882a593SmuzhiyunLICENSE 73*4882a593Smuzhiyun------- 74*4882a593Smuzhiyunlibtraceevent is Free Software licensed under the GNU LGPL 2.1 75*4882a593Smuzhiyun 76*4882a593SmuzhiyunRESOURCES 77*4882a593Smuzhiyun--------- 78*4882a593Smuzhiyunhttps://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 79