This is tty/new_intr.c (Listing 62-1, page 1301), an example from the book, The Linux Programming Interface.

The source code file is copyright 2022, Michael Kerrisk, and is licensed under the GNU General Public License, version 3.

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/* new_intr.c

   Demonstrate the use of tcgetattr() and tcsetattr() to change the
   terminal INTR (interrupt) character.
#include <termios.h>
#include <ctype.h>
#include "tlpi_hdr.h"
main(int argc, char *argv[])
    struct termios tp;
    int intrChar;

    if (argc > 1 && strcmp(argv[1], "--help") == 0)
        usageErr("%s [intr-char]\n", argv[0]);

    /* Determine new INTR setting from command line */

    if (argc == 1) {                                    /* Disable */
        intrChar = fpathconf(STDIN_FILENO, _PC_VDISABLE);
        if (intrChar == -1)
            errExit("Couldn't determine VDISABLE");
    } else if (isdigit((unsigned char) argv[1][0])) {
        intrChar = strtoul(argv[1], NULL, 0);           /* Allows hex, octal */
    } else {                                            /* Literal character */
        intrChar = argv[1][0];

    /* Fetch current terminal settings, modify INTR character, and
       push changes back to the terminal driver */

    if (tcgetattr(STDIN_FILENO, &tp) == -1)
    tp.c_cc[VINTR] = intrChar;
    if (tcsetattr(STDIN_FILENO, TCSAFLUSH, &tp) == -1)



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