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82 lines
2.6 KiB
C
82 lines
2.6 KiB
C
/* Copyright (C) 1993-2020 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 <errno.h>
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#include <string.h>
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#include <termios.h>
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#include <sys/ioctl.h>
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#include <sys/types.h>
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#include <sysdep.h>
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/* The difference here is that the termios structure used in the
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kernel is not the same as we use in the libc. Therefore we must
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translate it here. */
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#include <kernel_termios.h>
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/* This is a gross hack around a kernel bug. If the cfsetispeed functions
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is called with the SPEED argument set to zero this means use the same
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speed as for output. But we don't have independent input and output
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speeds and therefore cannot record this.
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We use an unused bit in the `c_iflag' field to keep track of this
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use of `cfsetispeed'. The value here must correspond to the one used
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in `speed.c'. */
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#define IBAUD0 020000000000
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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 __kernel_termios k_termios;
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unsigned long int cmd;
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switch (optional_actions)
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{
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case TCSANOW:
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cmd = TCSETS;
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break;
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case TCSADRAIN:
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cmd = TCSETSW;
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break;
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case TCSAFLUSH:
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cmd = TCSETSF;
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break;
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default:
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return INLINE_SYSCALL_ERROR_RETURN_VALUE (EINVAL);
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}
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k_termios.c_iflag = termios_p->c_iflag & ~IBAUD0;
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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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#if _HAVE_C_ISPEED && _HAVE_STRUCT_TERMIOS_C_ISPEED
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k_termios.c_ispeed = termios_p->c_ispeed;
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#endif
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#if _HAVE_C_OSPEED && _HAVE_STRUCT_TERMIOS_C_OSPEED
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k_termios.c_ospeed = termios_p->c_ospeed;
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#endif
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memcpy (&k_termios.c_cc[0], &termios_p->c_cc[0],
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__KERNEL_NCCS * sizeof (cc_t));
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return INLINE_SYSCALL (ioctl, 3, fd, cmd, &k_termios);
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}
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weak_alias (__tcsetattr, tcsetattr)
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libc_hidden_def (tcsetattr)
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