How to handle terminal in a safe protected way when cash/interrupt.

safe_secret_input_posix.c

#include <unistd.h>
#include <fcntl.h>
#include <termios.h>

static unsigned int fid;
static struct termios term;
static char error_stdin[] = "[!] error in /dev/stdin";
static char question_name[] = "[?] what is your secret name:\n";
static char awsner_name_1[] = "[!] ok, good day ";
static char awsner_name_2[] = "!\n";
static char name[256];
static ssize_t len;

int main()
{
    fid = open("/dev/stdin", 0);
    if (fid == -1) {
        write(2, error_stdin, sizeof(error_stdin));
        return 15;
    }

    tcgetattr(fid, &term);
    //term.c_lflag &= ~ICANON;
    term.c_lflag &= ~ECHO;
    term.c_cc[VTIME] = 0;
    term.c_cc[VMIN] = 1;
    if(tcsetattr(fid, TCSANOW, &term)){
        write(2, error_stdin, sizeof(error_stdin));
        return 15;
    }

    write(1, question_name, sizeof(question_name));
    len = read(fid, name, sizeof(name));

    write(1, awsner_name_1, sizeof(awsner_name_1) - 1);
    write(1, name, (len && len < sizeof(name))? --len: sizeof(name));
    write(1, awsner_name_2, sizeof(awsner_name_2));
    return 0;
}

use /proc/self/fd/0 instead of /dev/stdin