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linux/termios: factor out the kernel interface from termios_internal.h 

Factor out the internal kernel interface from termios_internal.h, so
that it can be used in test code without causing breakage due to glibc
internals used in headers.

[ v3: fix Alpha build breakage ]

Signed-off-by: H. Peter Anvin (Intel) <hpa@zytor.com>
Reviewed-by: Adhemerval Zanella  <adhemerval.zanella@linaro.org>
This commit is contained in:
H. Peter Anvin 2025-10-20 13:42:10 -07:00 committed by H.J. Lu
parent 8d999a6993
commit 6463953fec
3 changed files with 73 additions and 46 deletions
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4
sysdeps/unix/sysv/linux/alpha/termios_arch.h
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@ -17,8 +17,8 @@
License along with the GNU C Library; if not, see License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */ <https://www.gnu.org/licenses/>. */
#ifndef TERMIOS_INTERNALS_H #ifndef K_TERMIOS_H
# error "<termios_arch.h> should only be included from <termios_internals.h>" # error "<termios_arch.h> should only be included from <k_termios.h>"
#endif #endif
#define _TERMIOS2_NCCS 19 #define _TERMIOS2_NCCS 19

70
sysdeps/unix/sysv/linux/k_termios.h Normal file
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@ -0,0 +1,70 @@
/* termios kernel interface for Linux
Copyright (C) 1991-2025 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
#ifndef K_TERMIOS_H
#define K_TERMIOS_H
#include <stddef.h>
#include <unistd.h>
#include <termios.h>
#include <kernel-features.h>
#include <termios_arch.h>
/* The the termios2 structure used in the kernel interfaces is not the
same as the termios structure we use in the libc. Therefore we
must translate it here. */
struct termios2
{
tcflag_t c_iflag; /* input mode flags */
tcflag_t c_oflag; /* output mode flags */
tcflag_t c_cflag; /* control mode flags */
tcflag_t c_lflag; /* local mode flags */
#if _HAVE_TERMIOS2_C_CC_BEFORE_C_LINE
cc_t c_cc[_TERMIOS2_NCCS]; /* control characters */
cc_t c_line; /* line discipline */
#else
cc_t c_line; /* line discipline */
cc_t c_cc[_TERMIOS2_NCCS]; /* control characters */
#endif
speed_t c_ispeed; /* input speed */
speed_t c_ospeed; /* output speed */
};
/* Alpha got termios2 late, but TCGETS has exactly the same structure
format and function as TCGETS2. On all other platforms, the termios2
interface exists as far back as this version of glibc supports.
For TCSETS* it is more complicated; this is handled in tcsetattr.c.
Some other architectures only have the equivalent of the termios2
interface, in which case the old ioctl names are the only ones
presented, but are equivalent to the new ones. */
#ifndef TCGETS2
# define TCGETS2 TCGETS
# define TCSETS2 TCSETS
# define TCSETSW2 TCSETSW
# define TCSETSF2 TCSETSF
#elif !__ASSUME_TERMIOS2
/* Hack for Alpha */
# undef TCGETS2
# define TCGETS2 TCGETS
#endif
#endif /* KTERMIOS_H */

45
sysdeps/unix/sysv/linux/termios_internals.h
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@ -30,50 +30,7 @@
#include <sysdep.h> #include <sysdep.h>
#include <shlib-compat.h> #include <shlib-compat.h>
#include <termios_arch.h> #include <k_termios.h>
/* ---- Kernel interface definitions ---- */
/* The the termios2 structure used in the kernel interfaces is not the
same as the termios structure we use in the libc. Therefore we
must translate it here. */
struct termios2
{
tcflag_t c_iflag; /* input mode flags */
tcflag_t c_oflag; /* output mode flags */
tcflag_t c_cflag; /* control mode flags */
tcflag_t c_lflag; /* local mode flags */
#if _HAVE_TERMIOS2_C_CC_BEFORE_C_LINE
cc_t c_cc[_TERMIOS2_NCCS]; /* control characters */
cc_t c_line; /* line discipline */
#else
cc_t c_line; /* line discipline */
cc_t c_cc[_TERMIOS2_NCCS]; /* control characters */
#endif
speed_t c_ispeed; /* input speed */
speed_t c_ospeed; /* output speed */
};
/* Alpha got termios2 late, but TCGETS has exactly the same structure
format and function as TCGETS2. On all other platforms, the termios2
interface exists as far back as this version of glibc supports.
For TCSETS* it is more complicated; this is handled in tcsetattr.c.
Some other architectures only have the equivalent of the termios2
interface, in which case the old ioctl names are the only ones
presented, but are equivalent to the new ones. */
#ifndef TCGETS2
# define TCGETS2 TCGETS
# define TCSETS2 TCSETS
# define TCSETSW2 TCSETSW
# define TCSETSF2 TCSETSF
#elif !__ASSUME_TERMIOS2
/* Hack for Alpha */
# undef TCGETS2
# define TCGETS2 TCGETS
#endif
/* ---- Application interface definitions ---- */ /* ---- Application interface definitions ---- */