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diff -Nru glibc-2.17-c758a686/sysdeps/unix/sysv/linux/tcsetattr.c glibc-2.17-c758a686/sysdeps/unix/sysv/linux/tcsetattr.c
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--- glibc-2.17-c758a686/sysdeps/unix/sysv/linux/tcsetattr.c 2012-06-05 07:42:49.000000000 -0600
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+++ glibc-2.17-c758a686/sysdeps/unix/sysv/linux/tcsetattr.c 2012-06-07 12:15:21.831318623 -0600
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@@ -48,6 +48,7 @@ tcsetattr (fd, optional_actions, termios
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{
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struct __kernel_termios k_termios;
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unsigned long int cmd;
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+ int retval;
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switch (optional_actions)
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{
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@@ -79,6 +80,35 @@ tcsetattr (fd, optional_actions, termios
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memcpy (&k_termios.c_cc[0], &termios_p->c_cc[0],
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__KERNEL_NCCS * sizeof (cc_t));
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- return INLINE_SYSCALL (ioctl, 3, fd, cmd, &k_termios);
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+ retval = INLINE_SYSCALL (ioctl, 3, fd, cmd, &k_termios);
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+
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+ if (retval == 0 && cmd == TCSETS)
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+ {
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+ /* The Linux kernel has a bug which silently ignore the invalid
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+ c_cflag on pty. We have to check it here. */
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+ int save = errno;
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+ retval = INLINE_SYSCALL (ioctl, 3, fd, TCGETS, &k_termios);
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+ if (retval)
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+ {
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+ /* We cannot verify if the setting is ok. We don't return
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+ an error (?). */
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+ __set_errno (save);
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+ retval = 0;
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+ }
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+ else if ((termios_p->c_cflag & (PARENB | CREAD))
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+ != (k_termios.c_cflag & (PARENB | CREAD))
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+ || ((termios_p->c_cflag & CSIZE)
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+ && ((termios_p->c_cflag & CSIZE)
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+ != (k_termios.c_cflag & CSIZE))))
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+ {
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+ /* It looks like the Linux kernel silently changed the
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+ PARENB/CREAD/CSIZE bits in c_cflag. Report it as an
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+ error. */
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+ __set_errno (EINVAL);
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+ retval = -1;
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+ }
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+ }
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+
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+ return retval;
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}
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libc_hidden_def (tcsetattr)
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