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12126f86f2
Add constants indicating the maximum values of speed_t and baud_t.
Hopefully if and when the baud_t interface is standardized then
BAUD_MAX will be included in the standardization from the start.
Historically, the __MAX_BAUD symbol has indicated the maximum speed_t
value on at least some platforms (including glibc). However, this
name would be problematic for future standardization, because it
confusingly implies a reference to baud_t, not speed_t, and it is
inconsistent with other limit symbols, which are all of the form *_MAX
(e.g. SIZE_MAX for size_t.)
[ v3: dropped leading underscores, leave __MAX_BAUD outside
#ifdef __USE_MISC since it is a legacy symbol, and
namespace-protected with a double underscore.
(Collin Funk, Adhermerval Zanella Netto) ]
[ v4: moved from __USE_MISC to __USE_GNU (Collin Funk) ]
Signed-off-by: "H. Peter Anvin" (Intel) <hpa@zytor.com>
Reviewed-by: Collin Funk <collin.funk1@gmail.com>
76 lines
2.4 KiB
C
76 lines
2.4 KiB
C
/* termios baud rate selection definitions. Universal version for sane speed_t.
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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-baud.h> directly; use <termios.h> instead."
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#endif
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/* POSIX required baud rates */
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#define B0 0U /* Hang up or ispeed == ospeed */
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#define B50 50U
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#define B75 75U
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#define B110 110U
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#define B134 134U /* Really 134.5 baud by POSIX spec */
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#define B150 150U
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#define B200 200U
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#define B300 300U
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#define B600 600U
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#define B1200 1200U
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#define B1800 1800U
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#define B2400 2400U
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#define B4800 4800U
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#define B9600 9600U
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#define B19200 19200U
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#define B38400 38400U
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#ifdef __USE_MISC
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# define EXTA B19200
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# define EXTB B38400
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#endif
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/* Other baud rates, "nonstandard" but known to be used */
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#define B7200 7200U
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#define B14400 14400U
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#define B28800 28800U
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#define B33600 33600U
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#define B57600 57600U
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#define B76800 76800U
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#define B115200 115200U
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#define B153600 153600U
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#define B230400 230400U
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#define B307200 307200U
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#define B460800 460800U
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#define B500000 500000U
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#define B576000 576000U
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#define B614400 614400U
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#define B921600 921600U
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#define B1000000 1000000U
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#define B1152000 1152000U
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#define B1500000 1500000U
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#define B2000000 2000000U
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#define B2500000 2500000U
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#define B3000000 3000000U
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#define B3500000 3500000U
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#define B4000000 4000000U
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#define B5000000 5000000U
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#define B10000000 10000000U
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#ifdef __USE_GNU
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#define SPEED_MAX 4294967295U /* maximum valid speed_t value */
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#endif
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#define __MAX_BAUD 4294967295U /* legacy alias for SPEED_MAX */
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