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Linux has supported arbitrary speeds and split speeds in the kernel since 2008 on all platforms except Alpha (fixed in 2020), but glibc was never updated to match. This is further complicated by POSIX uses of macros for the cf[gs]et[io]speed interfaces, rather than plain numbers, as it really ought to have. On most platforms, the glibc ABI includes the c_[io]speed fields in struct termios, but they are incorrectly used. On MIPS and SPARC, they are entirely missing. For backwards compatibility, the kernel will still use the legacy speed fields unless they are set to BOTHER, and will use the legacy output speed as the input speed if the latter is 0 (== B0). However, the specific encoding used is visible to user space applications, including ones other than the one running. - SPARC and MIPS get a new struct termios, and tc[gs]etattr() is versioned accordingly. However, the new struct termios is set to be a strict extension of the old one, which means that cf* interfaces other than the speed-related ones do not need versioning. - The Bxxx constants are redefined as equivalent to their integer values and the legacy Bxxx constants are renamed __Bxxx. - cf[gs]et[io]speed() and cfsetspeed() are versioned accordingly. - tcgetattr() and cfset[io]speed() are adjusted to always keep the c_[io]speed fields correct (unlike earlier versions), but to canonicalize the representation to ALSO configure the legacy fields if a valid legacy representation exists. - tcsetattr(), too, canonicalizes the representation in this way before passing it to the kernel, to maximize compatibility with older applications/tools. - The old IBAUD0 hack is removed; it is no longer necessary since even the legacy c_cflag baud rate fields have had separate input values for a long time. Signed-off-by: H. Peter Anvin (Intel) <hpa@zytor.com> Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
46 lines
1.6 KiB
C
46 lines
1.6 KiB
C
/* termios baud rate selection definitions. Linux/sparc version.
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Copyright (C) 2019-2025 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library. If not, see
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<https://www.gnu.org/licenses/>. */
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#ifndef _TERMIOS_H
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# error "Never include <bits/termios-cbaud.h> directly; use <termios.h> instead."
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#endif
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#ifdef __USE_MISC
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# define CBAUD 0x0000100f
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# define CBAUDEX 0x00001000
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# define CIBAUD 0x100f0000 /* input baud rate */
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# define IBSHIFT 16
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#endif
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#define __B57600 0x00001001
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#define __B115200 0x00001002
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#define __B230400 0x00001003
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#define __B460800 0x00001004
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#define __B76800 0x00001005
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#define __B153600 0x00001006
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#define __B307200 0x00001007
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#define __B614400 0x00001008
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#define __B921600 0x00001009
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#define __B500000 0x0000100a
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#define __B576000 0x0000100b
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#define __B1000000 0x0000100c
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#define __B1152000 0x0000100d
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#define __B1500000 0x0000100e
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#define __B2000000 0x0000100f
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#define __BOTHER 0x00001000
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