1/* Copyright (C) 1992-2021 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
3
4 The GNU C Library is free software; you can redistribute it and/or
5 modify it under the terms of the GNU Lesser General Public
6 License as published by the Free Software Foundation; either
7 version 2.1 of the License, or (at your option) any later version.
8
9 The GNU C Library is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 Lesser General Public License for more details.
13
14 You should have received a copy of the GNU Lesser General Public
15 License along with the GNU C Library; if not, see
16 <https://www.gnu.org/licenses/>. */
17
18#include <errno.h>
19#include <string.h>
20#include <termios.h>
21#include <unistd.h>
22#include <sys/ioctl.h>
23#include <sys/types.h>
24#include <sysdep.h>
25
26/* The difference here is that the termios structure used in the
27 kernel is not the same as we use in the libc. Therefore we must
28 translate it here. */
29#include <kernel_termios.h>
30
31/* Put the state of FD into *TERMIOS_P. */
32int
33__tcgetattr (int fd, struct termios *termios_p)
34{
35 struct __kernel_termios k_termios;
36 int retval;
37
38 retval = INLINE_SYSCALL (ioctl, 3, fd, TCGETS, &k_termios);
39
40 if (__glibc_likely (retval == 0))
41 {
42 termios_p->c_iflag = k_termios.c_iflag;
43 termios_p->c_oflag = k_termios.c_oflag;
44 termios_p->c_cflag = k_termios.c_cflag;
45 termios_p->c_lflag = k_termios.c_lflag;
46 termios_p->c_line = k_termios.c_line;
47#if _HAVE_STRUCT_TERMIOS_C_ISPEED
48# if _HAVE_C_ISPEED
49 termios_p->c_ispeed = k_termios.c_ispeed;
50# else
51 termios_p->c_ispeed = k_termios.c_cflag & (CBAUD | CBAUDEX);
52# endif
53#endif
54#if _HAVE_STRUCT_TERMIOS_C_OSPEED
55# if _HAVE_C_OSPEED
56 termios_p->c_ospeed = k_termios.c_ospeed;
57# else
58 termios_p->c_ospeed = k_termios.c_cflag & (CBAUD | CBAUDEX);
59# endif
60#endif
61 if (sizeof (cc_t) == 1 || _POSIX_VDISABLE == 0
62 || (unsigned char) _POSIX_VDISABLE == (unsigned char) -1)
63 memset (__mempcpy (&termios_p->c_cc[0], &k_termios.c_cc[0],
64 __KERNEL_NCCS * sizeof (cc_t)),
65 _POSIX_VDISABLE, (NCCS - __KERNEL_NCCS) * sizeof (cc_t));
66 else
67 {
68 memcpy (&termios_p->c_cc[0], &k_termios.c_cc[0],
69 __KERNEL_NCCS * sizeof (cc_t));
70
71 for (size_t cnt = __KERNEL_NCCS; cnt < NCCS; ++cnt)
72 termios_p->c_cc[cnt] = _POSIX_VDISABLE;
73 }
74 }
75
76 return retval;
77}
78
79libc_hidden_def (__tcgetattr)
80weak_alias (__tcgetattr, tcgetattr)
81