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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>
130 lines
4.3 KiB
C
130 lines
4.3 KiB
C
/* Copyright (C) 1991-2025 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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/*
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* POSIX Standard: 7.1-2 General Terminal Interface <termios.h>
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*/
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#ifndef _TERMIOS_H
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#define _TERMIOS_H 1
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#include <features.h>
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#if defined __USE_XOPEN_EXTENDED || defined __USE_XOPEN2K8
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/* We need `pid_t'. */
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# include <bits/types.h>
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# ifndef __pid_t_defined
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typedef __pid_t pid_t;
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# define __pid_t_defined
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# endif
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#endif
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__BEGIN_DECLS
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/* Get the system-dependent definitions of `struct termios', `tcflag_t',
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`cc_t', `speed_t', and all the macros specifying the flag bits. */
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#include <bits/termios.h>
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#ifdef __USE_MISC
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/* Compare a character C to a value VAL from the `c_cc' array in a
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`struct termios'. If VAL is _POSIX_VDISABLE, no character can match it. */
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# define CCEQ(val, c) ((c) == (val) && (val) != _POSIX_VDISABLE)
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#endif
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/* Return the output baud rate stored in *TERMIOS_P. */
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extern speed_t cfgetospeed (const struct termios *__termios_p) __THROW;
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/* Return the input baud rate stored in *TERMIOS_P. */
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extern speed_t cfgetispeed (const struct termios *__termios_p) __THROW;
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/* Set the output baud rate stored in *TERMIOS_P to SPEED. */
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extern int cfsetospeed (struct termios *__termios_p, speed_t __speed) __THROW;
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/* Set the input baud rate stored in *TERMIOS_P to SPEED. */
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extern int cfsetispeed (struct termios *__termios_p, speed_t __speed) __THROW;
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#ifdef __USE_MISC
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/* Set both the input and output baud rates in *TERMIOS_OP to SPEED. */
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extern int cfsetspeed (struct termios *__termios_p, speed_t __speed) __THROW;
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#endif
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#ifdef __USE_GNU
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/* Interfaces that are explicitly numeric representations of baud rates */
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typedef speed_t baud_t;
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#define BAUD_MAX SPEED_MAX
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/* Return the output baud rate stored in *TERMIOS_P. */
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extern baud_t cfgetobaud (const struct termios *__termios_p) __THROW;
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/* Return the input baud rate stored in *TERMIOS_P. */
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extern baud_t cfgetibaud (const struct termios *__termios_p) __THROW;
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/* Set the output baud rate stored in *TERMIOS_P to BAUD. */
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extern int cfsetobaud (struct termios *__termios_p, baud_t __baud) __THROW;
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/* Set the input baud rate stored in *TERMIOS_P to BAUD. */
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extern int cfsetibaud (struct termios *__termios_p, baud_t __baud) __THROW;
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/* Set both the input and output baud rates in *TERMIOS_OP to BAUD. */
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extern int cfsetbaud (struct termios *__termios_p, baud_t __baud) __THROW;
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#endif
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/* Put the state of FD into *TERMIOS_P. */
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extern int tcgetattr (int __fd, struct termios *__termios_p) __THROW;
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/* Set the state of FD to *TERMIOS_P.
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Values for OPTIONAL_ACTIONS (TCSA*) are in <bits/termios.h>. */
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extern int tcsetattr (int __fd, int __optional_actions,
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const struct termios *__termios_p) __THROW;
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#ifdef __USE_MISC
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/* Set *TERMIOS_P to indicate raw mode. */
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extern void cfmakeraw (struct termios *__termios_p) __THROW;
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#endif
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/* Send zero bits on FD. */
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extern int tcsendbreak (int __fd, int __duration) __THROW;
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/* Wait for pending output to be written on FD.
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This function is a cancellation point and therefore not marked with
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__THROW. */
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extern int tcdrain (int __fd);
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/* Flush pending data on FD.
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Values for QUEUE_SELECTOR (TC{I,O,IO}FLUSH) are in <bits/termios.h>. */
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extern int tcflush (int __fd, int __queue_selector) __THROW;
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/* Suspend or restart transmission on FD.
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Values for ACTION (TC[IO]{OFF,ON}) are in <bits/termios.h>. */
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extern int tcflow (int __fd, int __action) __THROW;
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#if defined __USE_XOPEN_EXTENDED || defined __USE_XOPEN2K8
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/* Get process group ID for session leader for controlling terminal FD. */
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extern __pid_t tcgetsid (int __fd) __THROW;
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#endif
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#ifdef __USE_MISC
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# include <sys/ttydefaults.h>
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#endif
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__END_DECLS
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#endif /* termios.h */
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