CS:APP 第 10 章重點提示

導讀

你所不知道的 C 語言: Stream I/O 和 EOF

System-Level I/O

投影片 / 錄影

Image Not Showing Possible Reasons

The image file may be corrupted
The server hosting the image is unavailable
The image path is incorrect
The image format is not supported

UNIX 設計哲學: "Everything is a file"

更精確來說是 "Everything is a file descriptor"
But file descriptors are also created for things like anonymous pipes and network sockets via different methods
Page 622 - Page 623

搭配下圖理解 Linux 網路架構:

Image Not Showing Possible Reasons

The image file may be corrupted
The server hosting the image is unavailable
The image path is incorrect
The image format is not supported

延伸閱讀: In UNIX Everything is a File

Image Not Showing Possible Reasons

The image file may be corrupted
The server hosting the image is unavailable
The image path is incorrect
The image format is not supported

End of line (EOL) indicators in other systems

Linux and macOS: \n (0xa): line feed (LF)
Windows and Internet protocols: \r\n (0xd 0xa): Carriage return (CR) followed by line feed (LF)

Image Not Showing Possible Reasons

The image file may be corrupted
The server hosting the image is unavailable
The image path is incorrect
The image format is not supported

Page 627 - Page 631

Image Not Showing Possible Reasons

The image file may be corrupted
The server hosting the image is unavailable
The image path is incorrect
The image format is not supported

Pros and Cons of Unix I/O
slides p.51-54, p.56-58

自我檢查清單

tty 是什麼？緣起為何？對 UNIX 的影響又是？
為何 socket 也是一種 file type 呢？具體使用方式為何？
RIO package 提供 I/O 封裝的目的為何？對應到真實世界的應用為何？
Buffered I/O 的動機和效益為何？
在 fork 系統呼叫後，child process 和 parent process 的檔案分享狀況為何？(提示：閱讀 man-pages)