Named pipes in c

Question

I am trying to use named pipes in C and am running into some difficulty. In terms of anonymous pipes, I just create the pipe with the r/w descriptors and then close the opposite end every time I want to do a read or write. This is easy to do since I can just open() and close() the other end every time.

With named pipes, I am a bit confused, I found the instruction mkfifo() which creates the named pipe but don't understand how to read and write to it properly.

Thanks

Answer 1

After the pipe has been created with mkfifo() (which could have been done at any point in the past - named pipes exist in the filesystem until they're unlinked), the reading side opens it using open("/path/to/pipe", O_RDONLY) and the writing side opens it with open("/path/to/pipe", O_WRONLY) .

After that it can be used just like an anonymous pipe.

Answer 2

There's nothing much to it. Use mkfifo to make the pipe and then have your processes read and write to it like any file. It's not C specific either. You can do this:

mkfifo testfifo

cat testfifo

And then in another window

echo "hello, world" > testfifo

Answer 3

我认为您应该只使用管道，因为不管每个过程花费的时间如何，它们都会处理不同进程之间的数据传输