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* 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
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29
sysdeps/unix/sysv/linux/speed.c
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@ -22,6 +22,17 @@
#include <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 `tcsetattr.c'. */
#define IBAUD0 020000000000
/* Return the output baud rate stored in *TERMIOS_P. */
speed_t
cfgetospeed (termios_p)
@ -31,8 +42,16 @@ cfgetospeed (termios_p)
}
/* Return the input baud rate stored in *TERMIOS_P.
For Linux there is no difference between input and output speed. */
strong_alias (cfgetospeed, cfgetispeed);
Although for Linux there is no difference between input and output
speed, the numerical 0 is a special case for the input baud rate. It
should set the input baud rate to the output baud rate. */
speed_t
cfgetispeed (termios_p)
const struct termios *termios_p;
{
return ((termios_p->c_iflag & IBAUD0)
? 0 : termios_p->c_cflag & (CBAUD | CBAUDEX));
}
/* Set the output baud rate stored in *TERMIOS_P to SPEED. */
int
@ -47,6 +66,7 @@ cfsetospeed (termios_p, speed)
return -1;
}
termios_p->c_iflag &= ~IBAUD0;
termios_p->c_cflag &= ~(CBAUD | CBAUDEX);
termios_p->c_cflag |= speed;
@ -69,8 +89,11 @@ cfsetispeed (termios_p, speed)
return -1;
}
if (speed != 0)
if (speed == 0)
termios_p->c_iflag |= IBAUD0;
else
{
termios_p->c_iflag &= ~IBAUD0;
termios_p->c_cflag &= ~(CBAUD | CBAUDEX);
termios_p->c_cflag |= speed;
}