1*4882a593Smuzhiyunlibtraceevent(3) 2*4882a593Smuzhiyun================ 3*4882a593Smuzhiyun 4*4882a593SmuzhiyunNAME 5*4882a593Smuzhiyun---- 6*4882a593Smuzhiyuntep_is_bigendian, tep_is_local_bigendian, tep_set_local_bigendian - Get / set 7*4882a593Smuzhiyunthe endianness of the local machine. 8*4882a593Smuzhiyun 9*4882a593SmuzhiyunSYNOPSIS 10*4882a593Smuzhiyun-------- 11*4882a593Smuzhiyun[verse] 12*4882a593Smuzhiyun-- 13*4882a593Smuzhiyun*#include <event-parse.h>* 14*4882a593Smuzhiyun 15*4882a593Smuzhiyunenum *tep_endian* { 16*4882a593Smuzhiyun TEP_LITTLE_ENDIAN = 0, 17*4882a593Smuzhiyun TEP_BIG_ENDIAN 18*4882a593Smuzhiyun}; 19*4882a593Smuzhiyun 20*4882a593Smuzhiyunint *tep_is_bigendian*(void); 21*4882a593Smuzhiyunbool *tep_is_local_bigendian*(struct tep_handle pass:[*]_tep_); 22*4882a593Smuzhiyunvoid *tep_set_local_bigendian*(struct tep_handle pass:[*]_tep_, enum tep_endian _endian_); 23*4882a593Smuzhiyun-- 24*4882a593Smuzhiyun 25*4882a593SmuzhiyunDESCRIPTION 26*4882a593Smuzhiyun----------- 27*4882a593Smuzhiyun 28*4882a593SmuzhiyunThe _tep_is_bigendian()_ gets the endianness of the machine, executing 29*4882a593Smuzhiyunthe function. 30*4882a593Smuzhiyun 31*4882a593SmuzhiyunThe _tep_is_local_bigendian()_ function gets the endianness of the local 32*4882a593Smuzhiyunmachine, saved in the _tep_ handler. The _tep_ argument is the trace event 33*4882a593Smuzhiyunparser context. This API is a bit faster than _tep_is_bigendian()_, as it 34*4882a593Smuzhiyunreturns cached endianness of the local machine instead of checking it each time. 35*4882a593Smuzhiyun 36*4882a593SmuzhiyunThe _tep_set_local_bigendian()_ function sets the endianness of the local 37*4882a593Smuzhiyunmachine in the _tep_ handler. The _tep_ argument is trace event parser context. 38*4882a593SmuzhiyunThe _endian_ argument is the endianness: 39*4882a593Smuzhiyun[verse] 40*4882a593Smuzhiyun-- 41*4882a593Smuzhiyun _TEP_LITTLE_ENDIAN_ - the machine is little endian, 42*4882a593Smuzhiyun _TEP_BIG_ENDIAN_ - the machine is big endian. 43*4882a593Smuzhiyun-- 44*4882a593Smuzhiyun 45*4882a593SmuzhiyunRETURN VALUE 46*4882a593Smuzhiyun------------ 47*4882a593SmuzhiyunThe _tep_is_bigendian()_ function returns non zero if the endianness of the 48*4882a593Smuzhiyunmachine, executing the code, is big endian and zero otherwise. 49*4882a593Smuzhiyun 50*4882a593SmuzhiyunThe _tep_is_local_bigendian()_ function returns true, if the endianness of the 51*4882a593Smuzhiyunlocal machine, saved in the _tep_ handler, is big endian, or false otherwise. 52*4882a593Smuzhiyun 53*4882a593SmuzhiyunEXAMPLE 54*4882a593Smuzhiyun------- 55*4882a593Smuzhiyun[source,c] 56*4882a593Smuzhiyun-- 57*4882a593Smuzhiyun#include <event-parse.h> 58*4882a593Smuzhiyun... 59*4882a593Smuzhiyunstruct tep_handle *tep = tep_alloc(); 60*4882a593Smuzhiyun... 61*4882a593Smuzhiyun if (tep_is_bigendian()) 62*4882a593Smuzhiyun tep_set_local_bigendian(tep, TEP_BIG_ENDIAN); 63*4882a593Smuzhiyun else 64*4882a593Smuzhiyun tep_set_local_bigendian(tep, TEP_LITTLE_ENDIAN); 65*4882a593Smuzhiyun... 66*4882a593Smuzhiyun if (tep_is_local_bigendian(tep)) 67*4882a593Smuzhiyun printf("This machine you are running on is bigendian\n"); 68*4882a593Smuzhiyun else 69*4882a593Smuzhiyun printf("This machine you are running on is little endian\n"); 70*4882a593Smuzhiyun 71*4882a593Smuzhiyun-- 72*4882a593Smuzhiyun 73*4882a593SmuzhiyunFILES 74*4882a593Smuzhiyun----- 75*4882a593Smuzhiyun[verse] 76*4882a593Smuzhiyun-- 77*4882a593Smuzhiyun*event-parse.h* 78*4882a593Smuzhiyun Header file to include in order to have access to the library APIs. 79*4882a593Smuzhiyun*-ltraceevent* 80*4882a593Smuzhiyun Linker switch to add when building a program that uses the library. 81*4882a593Smuzhiyun-- 82*4882a593Smuzhiyun 83*4882a593SmuzhiyunSEE ALSO 84*4882a593Smuzhiyun-------- 85*4882a593Smuzhiyun_libtraceevent(3)_, _trace-cmd(1)_ 86*4882a593Smuzhiyun 87*4882a593SmuzhiyunAUTHOR 88*4882a593Smuzhiyun------ 89*4882a593Smuzhiyun[verse] 90*4882a593Smuzhiyun-- 91*4882a593Smuzhiyun*Steven Rostedt* <rostedt@goodmis.org>, author of *libtraceevent*. 92*4882a593Smuzhiyun*Tzvetomir Stoyanov* <tz.stoyanov@gmail.com>, author of this man page. 93*4882a593Smuzhiyun-- 94*4882a593SmuzhiyunREPORTING BUGS 95*4882a593Smuzhiyun-------------- 96*4882a593SmuzhiyunReport bugs to <linux-trace-devel@vger.kernel.org> 97*4882a593Smuzhiyun 98*4882a593SmuzhiyunLICENSE 99*4882a593Smuzhiyun------- 100*4882a593Smuzhiyunlibtraceevent is Free Software licensed under the GNU LGPL 2.1 101*4882a593Smuzhiyun 102*4882a593SmuzhiyunRESOURCES 103*4882a593Smuzhiyun--------- 104*4882a593Smuzhiyunhttps://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 105