lib/glibc
1
0
Fork 0
mirror of https://sourceware.org/git/glibc.git synced 2025-07-29 11:41:21 +03:00
Code Activity

Update.

Browse Source 
* sysdeps/unix/sysv/linux/speed.c (IBAUD0): New definition.  Bit
	set in c_iflag if cfsetispeed is call with SPEED set to zero.
	(cfgetispeed): Return zero if prior if IBAUD0 is set.
	(cfsetospeed): Clear IBAUD0 bit.
	(cfgetispeed): Set IBAUD0 bit if necessary.
	* sysdeps/unix/sysv/linux/tcsetattr.c (tcsetattr): Clear
	the IBAUD0 bit in c_iflag when making the system call.
	Work around a Linux kernel bug which silently changes the
	PARENB/CREAD/CSIZE bits in c_cflag on pty.
	Based on a patch by H.J. Lu <hjl@gnu.org>.
	* Makeconfig (link-libc-static): Don't use link-libc since this
	includes the shared object.  Use gnulib only.
This commit is contained in:
Ulrich Drepper
1998-12-07 16:14:02 +00:00
parent 5470bc9f78
commit a94b2ac0aa
4 changed files with 90 additions and 6 deletions
Download Patch File Download Diff File Expand all files Collapse all files

52
sysdeps/unix/sysv/linux/tcsetattr.c
View File

@ -28,6 +28,24 @@
#include <kernel_termios.h>
/* This is a gross hack around a kernel bug. If the cfsetispeed functions
is called with the SPEED argument set to zero this means use the same
speed as for output. But we don't have independent input and output
speeds and therefore cannot record this.
We use an unused bit in the `c_iflag' field to keep track of this
use of `cfsetispeed'. The value here must correspond to the one used
in `speed.c'. */
#if !defined _HAVE_C_ISPEED || !defined _HAVE_C_OSPEED
# define IBAUD0 020000000000
#else
/* If we have separate values for input and output speed don't bother
with this. Define the value as zero so the compiler sees we don't
have to do the AND below. */
# define IBAUD0 0
#endif
/* Set the state of FD to *TERMIOS_P. */
int
tcsetattr (fd, optional_actions, termios_p)
@ -37,6 +55,7 @@ tcsetattr (fd, optional_actions, termios_p)
{
struct __kernel_termios k_termios;
unsigned long int cmd;
int retval;
switch (optional_actions)
{
@ -54,7 +73,7 @@ tcsetattr (fd, optional_actions, termios_p)
return -1;
}
k_termios.c_iflag = termios_p->c_iflag;
k_termios.c_iflag = termios_p->c_iflag & ~IBAUD0;
k_termios.c_oflag = termios_p->c_oflag;
k_termios.c_cflag = termios_p->c_cflag;
k_termios.c_lflag = termios_p->c_lflag;
@ -68,5 +87,34 @@ tcsetattr (fd, optional_actions, termios_p)
memcpy (&k_termios.c_cc[0], &termios_p->c_cc[0],
__KERNEL_NCCS * sizeof (cc_t));
return __ioctl (fd, cmd, &k_termios);
retval = __ioctl (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 = __ioctl (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;
}