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Linux: Keep termios ioctl constants strictly internal

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Undefine TCGETS, TCGETS2, and related ioctl constants in the installed
headers.  Extract the correct constants (using the kernel type
definitions) automatically from the UAPI headers.  The kernel
constants are available under KERNEL_* names during the glibc build,
computed using assembler constant extraction mechanism.

Alpha may have to use TCGETS instead of TCGETS2 because TCTGETS2
became available in Linux 4.20 only.  Introduce ARCH_TCGETS to make
this choice explict.

To support emulation on powerpc, glibc versions of the termios
constants are added to the emulation code in internal-ioctl.h.

Reviewed-by: Adhemerval Zanella  <adhemerval.zanella@linaro.org>
This commit is contained in:
Florian Weimer
2025-07-11 16:04:07 +02:00
parent 02e7ac5ee3
commit 3d3572f590
18 changed files with 116 additions and 260 deletions
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36
sysdeps/unix/sysv/linux/sparc/bits/ioctls.h
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@@ -1,36 +0,0 @@
/* Copyright (C) 1996-2025 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 _SYS_IOCTL_H
# error "Never use <bits/ioctls.h> directly; include <sys/ioctl.h> instead."
#endif
/* Use the definitions from the kernel header files. */
#include <asm/ioctls.h>
/* Oh well, this is necessary since the kernel data structure is
different from the user-level version. */
#undef TCGETS
#undef TCSETS
#undef TCSETSW
#undef TCSETSF
#define TCGETS _IOR ('T', 8, char[36])
#define TCSETS _IOW ('T', 9, char[36])
#define TCSETSW _IOW ('T', 10, char[36])
#define TCSETSF _IOW ('T', 11, char[36])
#include <linux/sockios.h>