Expecting input from std::cin (Unix C++)

Question

Possible Duplicate:
Detect if stdin is a terminal or pipe in C/C++/Qt?

I'm writing a command line application that expects data as either a command line argument, or from cin.

Is there a way to check if the user piped some data in the application ($ ./myapp < test.txt), and only display a prompt for keyboard input if not?

If I'm checking for !cin.good() / cin.eof() etc., the prompt will never appear.

Possible duplicate: http://stackoverflow.com/questions/1312922/detect-if-stdin-is-a-terminal-or-pipe-in-c-c-qt — Magnus Hoff, Mar 05 '11 at 12:09

score 6 · Accepted Answer · answered Mar 05 '11 at 12:09

6

isatty(STDIN_FILENO)

will return whether standard input is a terminal (tty), i.e. interactive.

answered Mar 05 '11 at 12:09

Fred Foo

score 0 · Answer 2 · answered Mar 05 '11 at 12:09

0

Perhaps you can do something with fstat(2) and S_ISFIFO?

answered Mar 05 '11 at 12:09

Philipp T.

2 Answers2