In a C program it can be useful sometimes to know if the stdin / stdout / stderr is actually connected to a terminal or not. There is a function called isatty() which is dedicated to detecting this. An example is below.

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>

int main(int argc, char **argv) {
    if (argc < 2) {
        printf("ERROR: Need a file descriptor\n");
        exit(0);
    }
    printf("%d\n", isatty(atoi(argv[1])));
    return 0;
}




Last Modified: 21 December 2016

Releated Posts


2013-02-16 - C - Some simple examples of using strcat
2012-11-03 - C - How to override malloc / free
2012-09-22 - Linux Programming - Using inotify for detecting file modifications
2012-08-09 - C++ - Check an IP Address is in a IP Mask
2012-06-16 - CPP - Using gperf
2012-04-05 - Using gdb to debug a core file
2012-03-15 - C - Is the stdin a tty
2012-03-13 - C - Converting from char / string to int using atoi
2012-03-08 - C - UDP Socket example
2012-02-20 - C - Get home dir location in linux
2012-02-17 - C - IP address validation
2012-02-15 - C - Get current ip address of an interface
2012-02-10 - Using asprintf instead of sprintf or snprintf
2012-01-31 - C - Example of how to overwrite argv
2012-01-30 - C - The string reverse
2012-01-27 - C - Palindrome
2012-01-26 - C - Example of using popen
2011-12-28 - C - gethostbyname example
2011-12-11 - C - Linux get mac address from interface