Programming Archives

用C、Python和Shell语言在终端打印格式化和彩色文本

例子

以打印一个蓝色斜体的”hello, world“为例：

printf("\033[3;34mhello, world\033[0m\n");

1 2	printf("\033[3;34mhello, world\033[0m\n");

python

print "\033[3;34mhello, world\033[0m"

1 2	print "\033[3;34mhello, world\033[0m"

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C语言中结构体struct初始化和赋值的几种方式

http://stackoverflow.com/questions/330793/how-to-initialize-a-struct-in-accordance-with-c-programming-language-standards

在内核中fs/ext3/indoe.c中，一个struct初始化格式个这样的：

static const struct address_space_operations ext3_writeback_aops = {
         .readpage               = ext3_readpage,
         .readpages              = ext3_readpages,
         .writepage              = ext3_writeback_writepage,
         .write_begin            = ext3_write_begin,
         .write_end              = ext3_writeback_write_end,
         .bmap                   = ext3_bmap,
         .invalidatepage         = ext3_invalidatepage,
         .releasepage            = ext3_releasepage,
         .direct_IO              = ext3_direct_IO,
         .migratepage            = buffer_migrate_page,
         .is_partially_uptodate  = block_is_partially_uptodate,
         .error_remove_page      = generic_error_remove_page,
};

static const struct address_space_operations ext3_writeback_aops = {

.readpage = ext3_readpage,

.readpages = ext3_readpages,

.writepage = ext3_writeback_writepage,

.write_begin = ext3_write_begin,

.write_end = ext3_writeback_write_end,

.bmap = ext3_bmap,

.invalidatepage = ext3_invalidatepage,

.releasepage = ext3_releasepage,

.direct_IO = ext3_direct_IO,

.migratepage = buffer_migrate_page,

.is_partially_uptodate = block_is_partially_uptodate,

.error_remove_page = generic_error_remove_page,

};

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只用OS X系统实现A8嵌入式试验箱(linux)的交叉编译

连接

以电脑为终端，采用基于PL2302芯片的串口转USB线链接电脑和试验箱，MAC OS X系统需要安装芯片的驱动(文件名md_PL2303_MacOSX10_6_dmg_v1_4_0.zip）通过文件内说明文档进行相关设置，然后可以连接成功。
Mac终端下用screen命令实现试验箱终端功能.
screen /dev/tty.usbserial 115200
>注意拔下USB时要用A(ctrl+A)+k命令退出screen,否则会导致OS X 死机（不明原因）。如果没有退出screen直接将终端窗口关闭了，用命令ps|grep tty查找相应进程进程ID然后结束掉它(kill PID)，这样再拔出USB就不会死机了。

交叉编译

需要安装arm-none-linux-gnueabi-gcc,相当于linux的arm-linux-gcc。使用方法类似gcc.
arm-none-linux-gnueabi-gcc test.c -o test

ftp通信传输文件

通过以太网口连接试验箱和mac，终端修改试验箱ipconfig eth0 -i 192.168.1.101 -m 255.255.255.0 -g 192.168.1.1然后执service network restart、Mac自身网络偏好设置修改两者IP使其在同一区段（192.168.1.102）
在Mac终端下用ftp命令ftp 192.168.1.101登陆试验箱linux,用户名anonymous(匿名),密码任意。

put命令具体使用方法可以参考博文《Linux 终端访问 FTP 及上传下载文件》
上传文件put test test

在终端上执行程序

增加可权限chmod +x test
执行：./test

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