__FUNCTION__,__FILE__,__LINE__

__FUNCTION__, __FILE__, __LINE__在LINUX下的C/C++编程中，这3个变量分别为当前函数名(char *)，当前文件(char *)，当前行号(int)。

__FILE__ the filename
__LINE__ the line number
__FUNCTION__ the function name

you can use printf function diaplay it.

[venus@linux tmp]$ cat xx.c
main()
{
printf( "%d/n", __LINE__ );
printf( "%s/n", __FILE__ );
printf( "%s/n", __FUNCTION__ );
}

[venus@linux tmp]$ ./a.out
3
xx.c
main