diff options
Diffstat (limited to 'sysdeps/unix/sysv/linux/tcsetattr.c')
| -rw-r--r-- | sysdeps/unix/sysv/linux/tcsetattr.c | 32 |
1 files changed, 31 insertions, 1 deletions
diff --git a/sysdeps/unix/sysv/linux/tcsetattr.c b/sysdeps/unix/sysv/linux/tcsetattr.c index f73ec88..21e6ab2 100644 --- a/sysdeps/unix/sysv/linux/tcsetattr.c +++ b/sysdeps/unix/sysv/linux/tcsetattr.c @@ -49,6 +49,7 @@ tcsetattr (fd, optional_actions, termios_p) { struct __kernel_termios k_termios; unsigned long int cmd; + int retval; switch (optional_actions) { @@ -80,6 +81,35 @@ tcsetattr (fd, optional_actions, termios_p) memcpy (&k_termios.c_cc[0], &termios_p->c_cc[0], __KERNEL_NCCS * sizeof (cc_t)); - return INLINE_SYSCALL (ioctl, 3, fd, cmd, &k_termios); + retval = INLINE_SYSCALL (ioctl, 3, fd, cmd, &k_termios); + + if (retval == 0 && cmd == TCSETS) + { + /* The Linux kernel has a bug which silently ignore the invalid + c_cflag on pty. We have to check it here. */ + int save = errno; + retval = INLINE_SYSCALL (ioctl, 3, fd, TCGETS, &k_termios); + if (retval) + { + /* We cannot verify if the setting is ok. We don't return + an error (?). */ + __set_errno (save); + retval = 0; + } + else if ((termios_p->c_cflag & (PARENB | CREAD)) + != (k_termios.c_cflag & (PARENB | CREAD)) + || ((termios_p->c_cflag & CSIZE) + && ((termios_p->c_cflag & CSIZE) + != (k_termios.c_cflag & CSIZE)))) + { + /* It looks like the Linux kernel silently changed the + PARENB/CREAD/CSIZE bits in c_cflag. Report it as an + error. */ + __set_errno (EINVAL); + retval = -1; + } + } + + return retval; } libc_hidden_def (tcsetattr) |