summaryrefslogtreecommitdiff
path: root/sysdeps/unix/sysv/linux/speed.c
diff options
context:
space:
mode:
authorUlrich Drepper <drepper@redhat.com>1998-12-07 16:14:02 +0000
committerUlrich Drepper <drepper@redhat.com>1998-12-07 16:14:02 +0000
commita94b2ac0aaa1026e421389745d473e93fe56218f (patch)
tree21574f9d4b8169721f4c13ab628317ba272ae29d /sysdeps/unix/sysv/linux/speed.c
parent5470bc9f78247e48e50ce471a7939390c0f0639e (diff)
downloadglibc-a94b2ac0aaa1026e421389745d473e93fe56218f.tar.gz
Update.
* 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.
Diffstat (limited to 'sysdeps/unix/sysv/linux/speed.c')
-rw-r--r--sysdeps/unix/sysv/linux/speed.c29
1 files changed, 26 insertions, 3 deletions
diff --git a/sysdeps/unix/sysv/linux/speed.c b/sysdeps/unix/sysv/linux/speed.c
index a0aefd805a..5a23e53fc5 100644
--- a/sysdeps/unix/sysv/linux/speed.c
+++ b/sysdeps/unix/sysv/linux/speed.c
@@ -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;
}