libc/termios/tcgetattr.c

   1 /* Copyright (C) 1992, 1995, 1997, 1998 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    <http://www.gnu.org/licenses/>.  */
  17
  18 #include <features.h>
  19 #include <string.h>
  20 #include <termios.h>
  21 #include <unistd.h>
  22 #include <sys/ioctl.h>
  23 #include <sys/types.h>
  24
  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.  */
  32 int tcgetattr (int fd, struct termios *termios_p)
  33 {
  34     struct __kernel_termios k_termios;
  35     int retval;
  36
  37     retval = ioctl (fd, TCGETS, &k_termios);
  38         if(likely(retval == 0)) {
  39                 termios_p->c_iflag = k_termios.c_iflag;
  40                 termios_p->c_oflag = k_termios.c_oflag;
  41                 termios_p->c_cflag = k_termios.c_cflag;
  42                 termios_p->c_lflag = k_termios.c_lflag;
  43                 termios_p->c_line = k_termios.c_line;
  44 #ifdef _HAVE_C_ISPEED
  45                 termios_p->c_ispeed = k_termios.c_ispeed;
  46 #endif
  47 #ifdef _HAVE_C_OSPEED
  48                 termios_p->c_ospeed = k_termios.c_ospeed;
  49 #endif
  50
  51
  52                 if (sizeof (cc_t) == 1 || _POSIX_VDISABLE == 0
  53                         || (unsigned char) _POSIX_VDISABLE == (unsigned char) -1)
  54                 {
  55                 memset (mempcpy (&termios_p->c_cc[0], &k_termios.c_cc[0],
  56                                 __KERNEL_NCCS * sizeof (cc_t)),
  57                         _POSIX_VDISABLE, (NCCS - __KERNEL_NCCS) * sizeof (cc_t));
  58 #if 0
  59                 memset ( (memcpy (&termios_p->c_cc[0], &k_termios.c_cc[0],
  60                                 __KERNEL_NCCS * sizeof (cc_t)) + (__KERNEL_NCCS * sizeof (cc_t))) ,
  61                         _POSIX_VDISABLE, (NCCS - __KERNEL_NCCS) * sizeof (cc_t));
  62 #endif
  63                 } else {
  64                 size_t cnt;
  65
  66                 memcpy (&termios_p->c_cc[0], &k_termios.c_cc[0],
  67                         __KERNEL_NCCS * sizeof (cc_t));
  68
  69                 for (cnt = __KERNEL_NCCS; cnt < NCCS; ++cnt)
  70                         termios_p->c_cc[cnt] = _POSIX_VDISABLE;
  71                 }
  72         }
  73
  74     return retval;
  75 }
  76 libc_hidden_def(tcgetattr)