[Bug 276220] tty_disc canonical input processing: suprising behavior of the EOF cchar

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=276220

--- Comment #1 from hym2209268914@gmail.com ---
a minimal example, try to press 'hello^D' and observe it terminating
surprisingly.

```
#include <unistd.h>

int main() {
    char buffer[5];
    ssize_t nread;

    while ((nread = read(STDIN_FILENO, buffer, 5)) > 0) {
        write(STDOUT_FILENO, buffer, nread);
    }

    return 0;
}
```

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