libtraceevent-host_endian.txt (2590B)
1libtraceevent(3) 2================ 3 4NAME 5---- 6tep_is_bigendian, tep_is_local_bigendian, tep_set_local_bigendian - Get / set 7the endianness of the local machine. 8 9SYNOPSIS 10-------- 11[verse] 12-- 13*#include <event-parse.h>* 14 15enum *tep_endian* { 16 TEP_LITTLE_ENDIAN = 0, 17 TEP_BIG_ENDIAN 18}; 19 20int *tep_is_bigendian*(void); 21bool *tep_is_local_bigendian*(struct tep_handle pass:[*]_tep_); 22void *tep_set_local_bigendian*(struct tep_handle pass:[*]_tep_, enum tep_endian _endian_); 23-- 24 25DESCRIPTION 26----------- 27 28The _tep_is_bigendian()_ gets the endianness of the machine, executing 29the function. 30 31The _tep_is_local_bigendian()_ function gets the endianness of the local 32machine, saved in the _tep_ handler. The _tep_ argument is the trace event 33parser context. This API is a bit faster than _tep_is_bigendian()_, as it 34returns cached endianness of the local machine instead of checking it each time. 35 36The _tep_set_local_bigendian()_ function sets the endianness of the local 37machine in the _tep_ handler. The _tep_ argument is trace event parser context. 38The _endian_ argument is the endianness: 39[verse] 40-- 41 _TEP_LITTLE_ENDIAN_ - the machine is little endian, 42 _TEP_BIG_ENDIAN_ - the machine is big endian. 43-- 44 45RETURN VALUE 46------------ 47The _tep_is_bigendian()_ function returns non zero if the endianness of the 48machine, executing the code, is big endian and zero otherwise. 49 50The _tep_is_local_bigendian()_ function returns true, if the endianness of the 51local machine, saved in the _tep_ handler, is big endian, or false otherwise. 52 53EXAMPLE 54------- 55[source,c] 56-- 57#include <event-parse.h> 58... 59struct tep_handle *tep = tep_alloc(); 60... 61 if (tep_is_bigendian()) 62 tep_set_local_bigendian(tep, TEP_BIG_ENDIAN); 63 else 64 tep_set_local_bigendian(tep, TEP_LITTLE_ENDIAN); 65... 66 if (tep_is_local_bigendian(tep)) 67 printf("This machine you are running on is bigendian\n"); 68 else 69 printf("This machine you are running on is little endian\n"); 70 71-- 72 73FILES 74----- 75[verse] 76-- 77*event-parse.h* 78 Header file to include in order to have access to the library APIs. 79*-ltraceevent* 80 Linker switch to add when building a program that uses the library. 81-- 82 83SEE ALSO 84-------- 85_libtraceevent(3)_, _trace-cmd(1)_ 86 87AUTHOR 88------ 89[verse] 90-- 91*Steven Rostedt* <rostedt@goodmis.org>, author of *libtraceevent*. 92*Tzvetomir Stoyanov* <tz.stoyanov@gmail.com>, author of this man page. 93-- 94REPORTING BUGS 95-------------- 96Report bugs to <linux-trace-devel@vger.kernel.org> 97 98LICENSE 99------- 100libtraceevent is Free Software licensed under the GNU LGPL 2.1 101 102RESOURCES 103--------- 104https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git