uzix/picocom
1
0
Fork 0
mirror of https://github.com/UzixLS/picocom.git synced 2025-07-19 07:21:18 +03:00
Code Issues Projects Releases Wiki Activity

termios2.[ch]: Comments clean-up and corrections.

Browse Source
This commit is contained in:
Nick Patavalis
2015-08-20 12:02:27 +03:00
parent 495d142467
commit 30a06fd05f
2 changed files with 20 additions and 15 deletions
Download Patch File Download Diff File Expand all files Collapse all files

31
termios2.c
View File

@ -5,7 +5,7 @@
*
* by Nick Patavalis (npat@efault.net)
*
* ATTENTION: Very linux-specific kludge!
* ATTENTION: Linux-specific kludge!
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
@ -33,10 +33,10 @@
#include <termios.h>
#include <sys/ioctl.h>
/* Contains the definition of the termios2 structure and some
associated constants that we should normally include from kernel
sources. But unfortunatelly, we can't. See comments in
"termbits2.h" for more. */
/* Contains the definition of the termios2 structure and some related
constants that we should normally include from system
headers. Unfortunatelly, we can't. See comments in "termbits2.h"
for more. */
#include "termbits2.h"
/* GLIBC termios use an (otherwise unused) bit in c_iflags to
@ -107,15 +107,15 @@ tc2getattr(int fd, struct termios *tios)
}
/* The termios2 interface supports separate input and output
speeds. Old termios supported only one terminal speed. So the
speeds. GLIBC's termios support only one terminal speed. So the
standard tcsetispeed(3), actually sets the output-speed field, not
the input-speed field (or does nothing if speed == B0). Use
tc2setispeed if you want to set a standard input speed (one of the
Bxxxxx speeds) that may be different from the output speed. Also if
someone, somehow, has set the input speed to something other than
B0, then you *must* use c2setispeed() to change it. Using the
standard cfsetispeed() obviously won't do (since it affects only
the output-speed field).
cf2setispeed if you want to set a *standard* input speed (one of
the Bxxxxx speeds) that may be different from the output
speed. Also if someone, somehow, has set the input speed to
something other than B0, then you *must* use cf2setispeed() to
change it. Using the standard cfsetispeed() obviously won't do
(since it affects only the output-speed field).
*/
int
@ -139,6 +139,9 @@ cf2getispeed(struct termios *tios)
return (tios->c_cflag >> IBSHIFT) & (CBAUD | CBAUDEX);
}
/* Use these to set custom input or output speeds (i.e. speeds that do
not necessarily correspond to one of the Bxxx macros. */
int
cf2setospeed_custom(struct termios *tios, int speed)
{
@ -162,8 +165,8 @@ cf2setispeed_custom(struct termios *tios, int speed)
}
if ( speed == 0 ) {
/* Special case: ispeed == 0 means "same as ospeed". Kernel
* does this if it sees B0 in the "CIBAUD" field (i.e. in
* CBAUD << IBSHIFT) */
does this if it sees B0 in the "CIBAUD" field (i.e. in
CBAUD << IBSHIFT) */
tios->c_cflag &= ~((CBAUD | CBAUDEX) << IBSHIFT);
tios->c_cflag |= (B0 << IBSHIFT);
} else {

4
termios2.h
View File

@ -5,6 +5,8 @@
*
* by Nick Patavalis (npat@efault.net)
*
* ATTENTION: Linux-specific kludge!
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of the
@ -26,7 +28,7 @@
#include <termios.h>
/* Replace termios function, with termios2 functions */
/* Replace termios functions, with termios2 functions */
#define tcsetattr tc2setattr
#define tcgetattr tc2getattr
#define cfsetispeed cf2setispeed