How Can I Distinguish Between Terminal and Pipe Input in C/C ?

Identifying Standard Input Type: Terminal vs. Pipe in C/C

In the Python interactive shell, executing "python" without arguments initiates the REPL interface. However, running "cat | python" via the terminal bypasses the interactive mode, demonstrating that Python detects stdin (standard input) as a pipe. How can a similar distinction be made in C/C or Qt?

Solution: Utilize isatty()

To detect whether standard input is connected to a terminal or a pipe in C/C , employ the function isatty():

#include <stdio.h>
#include <io.h>
...

if (isatty(fileno(stdin))) {
  printf("stdin is a terminal\n");
} else {
  printf("stdin is a file or a pipe\n");
}

On Windows platforms, the function names are prefixed with underscores:

if (_isatty(_fileno(stdin))) {
  printf("stdin is a terminal\n");
} else {
  printf("stdin is a file or a pipe\n");
}

The above is the detailed content of How Can I Distinguish Between Terminal and Pipe Input in C/C ?. For more information, please follow other related articles on the PHP Chinese website!