glibc/patches/glibc-fedora-linux-tcsetattr.patch

   1 diff -Nrup a/sysdeps/unix/sysv/linux/tcsetattr.c b/sysdeps/unix/sysv/linux/tcsetattr.c
   2 --- a/sysdeps/unix/sysv/linux/tcsetattr.c       2012-06-05 07:42:49.000000000 -0600
   3 +++ b/sysdeps/unix/sysv/linux/tcsetattr.c       2012-06-07 12:15:21.831318623 -0600
   4 @@ -48,6 +48,7 @@ tcsetattr (fd, optional_actions, termios
   5  {
   6    struct __kernel_termios k_termios;
   7    unsigned long int cmd;
   8 +  int retval;
   9
  10    switch (optional_actions)
  11      {
  12 @@ -79,6 +80,35 @@ tcsetattr (fd, optional_actions, termios
  13    memcpy (&k_termios.c_cc[0], &termios_p->c_cc[0],
  14           __KERNEL_NCCS * sizeof (cc_t));
  15
  16 -  return INLINE_SYSCALL (ioctl, 3, fd, cmd, &k_termios);
  17 +  retval = INLINE_SYSCALL (ioctl, 3, fd, cmd, &k_termios);
  18 +
  19 +  if (retval == 0 && cmd == TCSETS)
  20 +    {
  21 +      /* The Linux kernel has a bug which silently ignore the invalid
  22 +        c_cflag on pty. We have to check it here. */
  23 +      int save = errno;
  24 +      retval = INLINE_SYSCALL (ioctl, 3, fd, TCGETS, &k_termios);
  25 +      if (retval)
  26 +       {
  27 +         /* We cannot verify if the setting is ok. We don't return
  28 +            an error (?). */
  29 +         __set_errno (save);
  30 +         retval = 0;
  31 +       }
  32 +      else if ((termios_p->c_cflag & (PARENB | CREAD))
  33 +              != (k_termios.c_cflag & (PARENB | CREAD))
  34 +              || ((termios_p->c_cflag & CSIZE)
  35 +                  && ((termios_p->c_cflag & CSIZE)
  36 +                      != (k_termios.c_cflag & CSIZE))))
  37 +       {
  38 +         /* It looks like the Linux kernel silently changed the
  39 +            PARENB/CREAD/CSIZE bits in c_cflag. Report it as an
  40 +            error. */
  41 +         __set_errno (EINVAL);
  42 +         retval = -1;
  43 +       }
  44 +    }
  45 +
  46 +  return retval;
  47  }
  48  libc_hidden_def (tcsetattr)