[cs631apue] setting the password

[Nick Smith]

Hey PA,
When you run with <test.txt this is redirecting the file's contents as 
your stdin. So being as this is not a TTY (it's a pipe), I bet that's 
why tcsetattr is failing. Check isatty(3) first.
-Nick

On Sun 08 Dec 2013 09:55:33 PM EST, Paul-Anthony Dudzinski wrote:
> Hello all,
>
> I am writing the function to take the password from the user using the
> termios (3). So far I have
>
> int get_pass(unsigned char *pwd)
> {
>     struct termios oflags, nflags;
>     char password[MAX_PASS_LEN];
>     char pass2[MAX_PASS_LEN];
>
>     /* disabling echo */
>     tcgetattr(fileno(stdin), &oflags);
>     nflags = oflags;
>     nflags.c_lflag &= ~ECHO;
>     nflags.c_lflag |= ECHONL;
>
>     if (tcsetattr(fileno(stdin),  TCSANOW, &nflags) != 0) {
>     perror("tcsetattr");
>     }
>
>     printf("Password: ");
>     fgets(password, sizeof(password), stdin);
>     password[strlen(password) - 1] = 0;
>
>     while( strcmp(password,pass2) != 0){
>         printf("Again : ");
>         fgets(pass2, sizeof(pass2), stdin);
>         pass2[strlen(pass2) - 1] = 0;
>     }
>
>     memcpy(pwd,password,strlen(password));
>
>     /* restore terminal */
>     if (tcsetattr(fileno(stdin), TCSANOW, &oflags) != 0) {
>         perror("tcsetattr");
>         return EXIT_FAILURE;
>     }
>
>     return 0;
> }
>
>
> This works fine when I run this by itself in a separate main function.
> However when I put this in with my other code I get some errors that I
> do not know how to handle and makes my program unstable.
>
>
> pdudzins at rainman:~/cs631/hw5$ ./a.out -e < test.txt > out.txt
> tcsetattr: Inappropriate ioctl for device
>
> I am not sure how to appropriately handle the terminal using
> tcsetattr. Has anyone run into this problem?
>
>
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