程序代做 COMP 3430 Guderian

Operating Systems
COMP 3430 Guderian

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Same as fifos?
| did you know this is a pipe character?

Anonymous and named
There are 2 types of pipes

Anonymous and named pipes
There are 2 types of pipes
Anonymous – where the two processes are related somehow

Anonymous and named pipes
There are 2 types of pipes
Anonymous – where the two processes are related somehow
Named – a file (because unix)

Pipes are managed by the kernel
Buffers information between readers and writers
Writes are atomic – never interfered with by a context switch.
man 7 pipe

Anonymous pipes
This is how classic piping functions:
cat something.txt | sort | head | less

Anonymous pipes – how
man 2 pipe has an example! Modified example is available.
Element 0 is read, element 1 is write. Remember: forking copies the process image, including file descriptors!
Parent takes [1], closes[0]
Child takes [0] and closes[1]
Use read and write to communicate

read and write Write to a pipe, specify an amount
char words[] = “Hey”;
write(pipefd[1], words, strlen(words));

read and write
Read from a pipe, easiest (not optimal) 1 char at a time
read(pipefd[0], &buf, 1);

Anonymous pipes
Useful, but… a little old-school. Named pipes can be more flexible for us.

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