scanf failling with ICANON mode when in daemon mode (screen -dmS)

[Presseau, Michael]

Hi,

I have done my own application console with scanf(). When I run in the screen 
(screen -mS test ./test), it work as expected with each characters printed. But 
when I run it in screen as daemon, it's failing in loop:
$ screen -dmS test ./test
$ screen -r test

stdin_thread scanf failed! ret: -1
stdin_thread scanf failed! ret: -1

Do you have any clue on how I can make this work in deamon mode?

Here is my sample code:
```
#include <stdio.h>
#include <errno.h>
#include <termios.h>
#include <unistd.h>

void enableRawMode()
{
#ifdef __linux__
                struct termios raw;

                // Get current terminal attributes
                tcgetattr(STDIN_FILENO, &raw);

                // Modify terminal attributes for raw mode
                raw.c_lflag &= ~(ECHO | ICANON);

                // Set modified attributes
                tcsetattr(STDIN_FILENO, TCSAFLUSH, &raw);
#endif
}

int main() {
                enableRawMode();

                char c;
                while (1) {
                               int ret = scanf("%c", &c);
                               if ( ret > 0) {
                                               printf("%c", c);
                               } else {
                                               printf("stdin_thread scanf 
failed! ret: %d\n", ret);
                               }
                }
                return 0;
}
```

Michael