Dev stdin what is

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Linked 2. Related 0. Hot Network Questions. Processes interact with files via file descriptors. When a process opens a file, the OS gives the process a file descriptor a number which the process can use to read or write from the open file.

We can see this with strace :. Here, cat foo. The standard streams in, out and error are at file descriptors 0, 1 and 2 respectively. The standard streams are pre-attached; the process does not have to open them. For example, cat run with no arguments reads from file descriptor 0 and writes to file descriptor 1. In a shell pipeline, these standard file descriptors are references to anonymous pipes. Which numbers do you think it gets back? Personally I would create two functions. Add a comment.

Active Oldest Votes. Improve this answer. Nahuel Fouilleul Nahuel Fouilleul Sorry my mistake, I have a bad habit of referring to them both as the same thing I'll edit. Inian Inian Actually stdin could well be a pipe, not a terminal, right? Inian thanks for the answer. Sign up or log in Sign up using Google. Sign up using Facebook. Sign up using Email and Password. Post as a guest Name. Email Required, but never shown.

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