termios: merge the termios baud definitions

Now all platforms unconditionally use the "sane" definitions of the
termios baud constants. Unify them into a common file.

Note: I have made them explicitly unsigned to avoid problems with
compiler warnings for comparisons of unequal signedness or
similar. These constants were historically octal on most platforms,
and so unsigned by default.

Signed-off-by: H. Peter Anvin (Intel) <hpa@zytor.com>
Reviewed-by: Adhemerval Zanella  <adhemerval.zanella@linaro.org>

bits/termios-baud.h

@@ -1,4 +1,4 @@
-/* termios baud rate selection definitions.  Linux/generic version.
+/* termios baud rate selection definitions. Universal version for sane speed_t.
    Copyright (C) 2019-2025 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
 
@@ -20,37 +20,44 @@
 # error "Never include <bits/termios-baud.h> directly; use <termios.h> instead."
 #endif
 
-#define B0                   0U
-#define B50                 50U
-#define B75                 75U
-#define B110               110U
-#define B134               134U
-#define B150               150U
-#define B200               200U
-#define B300               300U
-#define B600               600U
-#define B1200             1200U
-#define B1800             1800U
-#define B2400             2400U
-#define B4800             4800U
-#define B7200             7200U
-#define B9600             9600U
-#define B14400           14400U
-#define B19200           19200U
-#define B28800           28800U
-#define B33600           33600U
-#define B38400           38400U
-#define B57600           57600U
-#define B76800           76800U
-#define B115200         115200U
-#define B153600         153600U
-#define B230400         230400U
-#define B307200         307200U
-#define B460800         460800U
-#define B500000         500000U
-#define B576000         576000U
-#define B614400         614400U
-#define B921600         921600U
+/* POSIX required baud rates */
+#define B0		     0U		/* Hang up or ispeed == ospeed */
+#define B50		    50U
+#define B75		    75U
+#define B110		   110U
+#define B134		   134U		/* Really 134.5 baud by POSIX spec */
+#define B150		   150U
+#define B200		   200U
+#define B300		   300U
+#define B600		   600U
+#define B1200		  1200U
+#define B1800		  1800U
+#define B2400		  2400U
+#define B4800		  4800U
+#define B9600		  9600U
+#define	B19200		 19200U
+#define	B38400		 38400U
+#ifdef	__USE_MISC
+# define EXTA		 B19200
+# define EXTB		 B38400
+#endif
+
+/* Other baud rates, "nonstandard" but known to be used */
+#define B7200		  7200U
+#define B14400		 14400U
+#define B28800		 28800U
+#define B33600		 33600U
+#define B57600		 57600U
+#define B76800		 76800U
+#define B115200		115200U
+#define B153600		153600U
+#define B230400		230400U
+#define B307200		307200U
+#define B460800		460800U
+#define B500000		500000U
+#define B576000		576000U
+#define B614400		614400U
+#define B921600		921600U
 #define B1000000       1000000U
 #define B1152000       1152000U
 #define B1500000       1500000U
@@ -59,5 +66,7 @@
 #define B3000000       3000000U
 #define B3500000       3500000U
 #define B4000000       4000000U
+#define B5000000       5000000U
+#define B10000000     10000000U
 
 #define __MAX_BAUD  4294967295U

bits/termios.h

@@ -20,6 +20,8 @@
 # error "Never include <bits/termios.h> directly; use <termios.h> instead."
 #endif
 
+#include <bits/termios-baud.h>
+
 /* These macros are also defined in some <bits/ioctls.h> files (with
    numerically identical values), but this serves to shut up cpp's
    complaining. */
@@ -285,45 +287,6 @@ struct termios
 
   /* Input and output baud rates.  */
   speed_t __ispeed, __ospeed;
-#define	B0	0		/* Hang up.  */
-#define	B50	50		/* 50 baud.  */
-#define	B75	75		/* 75 baud.  */
-#define	B110	110		/* 110 baud.  */
-#define	B134	134		/* 134.5 baud.  */
-#define	B150	150		/* 150 baud.  */
-#define	B200	200		/* 200 baud.  */
-#define	B300	300		/* 300 baud.  */
-#define	B600	600		/* 600 baud.  */
-#define	B1200	1200		/* 1200 baud.  */
-#define	B1800	1800		/* 1800 baud.  */
-#define	B2400	2400		/* 2400 baud.  */
-#define	B4800	4800		/* 4800 baud.  */
-#define	B9600	9600		/* 9600 baud.  */
-#define	B7200	7200		/* 7200 baud.  */
-#define	B14400	14400		/* 14400 baud.  */
-#define	B19200	19200		/* 19200 baud.  */
-#define	B28800	28800		/* 28800 baud.  */
-#define	B38400	38400		/* 38400 baud.  */
-#ifdef	__USE_MISC
-# define EXTA	19200
-# define EXTB	38400
-#endif
-#define	B57600	57600
-#define	B76800	76800
-#define	B115200	115200
-#define	B230400	230400
-#define	B460800	460800
-#define	B500000	500000
-#define	B576000	576000
-#define	B921600	921600
-#define	B1000000 1000000
-#define	B1152000 1152000
-#define	B1500000 1500000
-#define	B2000000 2000000
-#define	B2500000 2500000
-#define	B3000000 3000000
-#define	B3500000 3500000
-#define	B4000000 4000000
 };
 
 #define _IOT_termios /* Hurd ioctl type field.  */ \

sysdeps/unix/sysv/linux/Makefile

@@ -151,7 +151,6 @@ sysdep_headers += \
   bits/struct_stat.h \
   bits/struct_stat_time64_helper.h \
   bits/syscall.h \
-  bits/termios-baud.h \
   bits/termios-c_cc.h \
   bits/termios-c_cflag.h \
   bits/termios-c_iflag.h \

sysdeps/unix/sysv/linux/bits/termios.h

@@ -35,6 +35,7 @@ typedef unsigned int	tcflag_t;
 /* c_cflag bit meaning */
 #include <bits/termios-c_cflag.h>
 
+#ifdef __USE_MISC
 #define __B0	 0000000	/* hang up */
 #define __B50	 0000001
 #define __B75	 0000002
@@ -53,9 +54,8 @@ typedef unsigned int	tcflag_t;
 #define __B38400 0000017
 #include <bits/termios-cbaud.h>
 
-#ifdef __USE_MISC
-# define EXTA	 __B19200
-# define EXTB	 __B38400
+# define __EXTA	 __B19200
+# define __EXTB	 __B38400
 # define BOTHER  __BOTHER
 #endif
 

termios/Makefile

@@ -22,8 +22,8 @@ subdir	:= termios
 
 include ../Makeconfig
 
-headers	:= termios.h bits/termios.h sys/ttydefaults.h sys/termios.h \
-	   sys/ttychars.h
+headers	:= termios.h bits/termios.h bits/termios-baud.h \
+	   sys/ttydefaults.h sys/termios.h sys/ttychars.h
 
 routines	:= speed cfsetspeed tcsetattr tcgetattr tcgetpgrp tcsetpgrp \
 		   tcdrain tcflow tcflush tcsendbrk cfmakeraw tcgetsid