mirror of git://sourceware.org/git/glibc.git
109 lines
3.4 KiB
C
109 lines
3.4 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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/* 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(TCSETSW2, TCSETS2 + 1);
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static_assert_equal(TCSETSF2, TCSETS2 + 2);
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static_assert_equal(TCSETSW, TCSETS + 1);
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static_assert_equal(TCSETSF, 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 += TCSETS2;
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}
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else
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{
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cmd += 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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