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3d3572f590
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>
115 lines
3.8 KiB
C
115 lines
3.8 KiB
C
/* Copyright (C) 1993-2025 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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#include <termios_internals.h>
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#define static_assert_equal(x,y) _Static_assert ((x) == (y), #x " != " #y)
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static_assert_equal (sizeof (struct termios2), KERNEL_TERMIOS2_SIZE);
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static_assert_equal (offsetof (struct termios2, c_cc),
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KERNEL_TERMIOS2_CC_OFFSET);
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static_assert_equal (offsetof (struct termios2, c_line),
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KERNEL_TERMIOS2_LINE_OFFSET);
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/* Set the state of FD to *TERMIOS_P. */
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int
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__tcsetattr (int fd, int optional_actions, const struct termios *termios_p)
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{
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struct termios2 k_termios;
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unsigned long cmd;
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memset (&k_termios, 0, sizeof k_termios);
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k_termios.c_iflag = termios_p->c_iflag;
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k_termios.c_oflag = termios_p->c_oflag;
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k_termios.c_cflag = termios_p->c_cflag;
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k_termios.c_lflag = termios_p->c_lflag;
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k_termios.c_line = termios_p->c_line;
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k_termios.c_ospeed = termios_p->c_ospeed;
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k_termios.c_ispeed = termios_p->c_ispeed;
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___termios2_canonicalize_speeds (&k_termios);
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copy_c_cc (k_termios.c_cc, _TERMIOS2_NCCS, termios_p->c_cc, NCCS);
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/*
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* Choose the proper ioctl number to invoke.
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*
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* Alpha got TCSETS2 late (Linux 4.20), but has the same structure
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* format, and it only needs TCSETS2 if either it needs to use
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* __BOTHER or split speed. All other architectures have TCSETS2 as
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* far back as the current glibc supports. Calling TCSETS with
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* __BOTHER causes unpredictable results on old Alpha kernels and
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* could even crash them.
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*/
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static_assert_equal(TCSADRAIN, TCSANOW + 1);
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static_assert_equal(TCSAFLUSH, TCSANOW + 2);
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static_assert_equal(KERNEL_TCSETSW2, KERNEL_TCSETS2 + 1);
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static_assert_equal(KERNEL_TCSETSF2, KERNEL_TCSETS2 + 2);
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static_assert_equal(KERNEL_TCSETSW, KERNEL_TCSETS + 1);
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static_assert_equal(KERNEL_TCSETSF, KERNEL_TCSETS + 2);
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cmd = (long)optional_actions - TCSANOW;
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if (cmd > 2)
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return INLINE_SYSCALL_ERROR_RETURN_VALUE (EINVAL);
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if (__ASSUME_TERMIOS2 ||
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k_termios.c_ospeed != k_termios.c_ispeed ||
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cbaud (k_termios.c_cflag) == __BOTHER)
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{
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cmd += KERNEL_TCSETS2;
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}
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else
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{
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cmd += KERNEL_TCSETS;
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k_termios.c_cflag &= ~CIBAUD;
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}
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return INLINE_SYSCALL_CALL (ioctl, fd, cmd, &k_termios);
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}
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libc_hidden_def (__tcsetattr)
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#if _HAVE_STRUCT_OLD_TERMIOS && _TERMIOS_OLD_COMPAT
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versioned_symbol (libc, __tcsetattr, tcsetattr, GLIBC_2_42);
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/* Legacy version for shorter struct termios without speed fields */
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int
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attribute_compat_text_section
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__old_tcsetattr (int fd, int optional_actions, const old_termios_t *termios_p)
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{
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struct termios new_termios;
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memset (&new_termios, 0, sizeof (new_termios));
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new_termios.c_iflag = termios_p->c_iflag;
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new_termios.c_oflag = termios_p->c_oflag;
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new_termios.c_cflag = termios_p->c_cflag;
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new_termios.c_lflag = termios_p->c_lflag;
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new_termios.c_line = termios_p->c_line;
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copy_c_cc(new_termios.c_cc, NCCS, termios_p->c_cc, OLD_NCCS);
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return __tcsetattr (fd, optional_actions, &new_termios);
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}
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compat_symbol (libc, __old_tcsetattr, tcsetattr, GLIBC_2_0);
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#else
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weak_alias (__tcsetattr, tcsetattr)
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#endif
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