https://www.xuebuyuan.com/1933526.html

调用backtrace的时候，动态链接库（.so)的调用地址不能直接调用addr2line得到代码行数，*上的方法比较麻烦

可以通过读取/proc/pid/maps获得动态能链接库加载路径。

int get_backtrace_string(void* bt,char* buff,int buff_size)
{
	char cmd[128] = {0};
	char property[256]={0};
	char not_care1[128]={0},not_care2[128]={0},not_care3[128]={0};
	char library_path[256]={0};
	char exe_path[256],function_name[256];
	char maps_line[1024]={0};
	void* offset_start,*offset_end;
	int maps_column_num=0;
	FILE* fd_maps=NULL;
	fd_maps=fopen("/proc/self/maps","r");
	unsigned long exe_symbol_offset=0;
	char* unknow_position="??:0\n";
	if(fd_maps==NULL)
	{
		return -1;
	}
	while(NULL!=fgets(maps_line,sizeof(maps_line),fd_maps))
	{
		maps_column_num=sscanf(maps_line,"%p-%p\t%s\t%s\t%s\t%s\t%s"
														,&offset_start
														,&offset_end
														,property
														,not_care1
														,not_care2
														,not_care3
														,library_path);
		if(maps_column_num==7&&bt>=offset_start&&bt<=offset_end)
		{
			break;
		}
		
	}
	fclose(fd_maps);
	readlink("/proc/self/exe", exe_path, sizeof(exe_path));
	if(exe_path[strlen(exe_path)-1]=='\n')
	{
		exe_path[strlen(exe_path)-1]='\0';
	}
	if(0==strcmp(exe_path,library_path))
	{
		exe_symbol_offset=(unsigned long)bt;
	}
	else
	{
		exe_symbol_offset=(char*)bt-(char*)offset_start;
	}
	snprintf(cmd,sizeof(cmd),"addr2line -C -e %s 0x%lx",library_path,exe_symbol_offset);
	exec_shell(cmd, buff, buff_size);
	if(0==strcmp(buff,unknow_position))
	{
		snprintf(cmd,sizeof(cmd),"addr2line -Cif -e %s 0x%lx",library_path,exe_symbol_offset);
		exec_shell(cmd, function_name, sizeof(function_name));
		function_name[strlen(function_name)-1]='\0';
		snprintf(buff,buff_size,"%s(%s+0x%lx)\n",library_path,function_name,exe_symbol_offset);
	}
	return 0;
}

参考资料：

http://*.com/questions/18892033/analyze-backtrace-of-a-crash-occurring-due-to-a-faulty-library

http://blog.csdn.net/eroswang/article/details/4102810