sysdeps/unix/sysv/linux/tcgetattr.c

   1 /* Copyright (C) 1992,1995,1997,1998,2003,2006 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, write to the Free
  16    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  17    02111-1307 USA.  */
  18
  19 #include <errno.h>
  20 #include <string.h>
  21 #include <termios.h>
  22 #include <unistd.h>
  23 #include <sys/ioctl.h>
  24 #include <sys/types.h>
  25 #include <sysdep.h>
  26
  27 /* The difference here is that the termios structure used in the
  28    kernel is not the same as we use in the libc.  Therefore we must
  29    translate it here.  */
  30 #include <kernel_termios.h>
  31
  32 /* Put the state of FD into *TERMIOS_P.  */
  33 int
  34 __tcgetattr (fd, termios_p)
  35       int fd;
  36       struct termios *termios_p;
  37 {
  38   struct __kernel_termios k_termios;
  39   int retval;
  40
  41   retval = INLINE_SYSCALL (ioctl, 3, fd, TCGETS, &k_termios);
  42
  43   if (__builtin_expect (retval == 0, 1))
  44     {
  45       termios_p->c_iflag = k_termios.c_iflag;
  46       termios_p->c_oflag = k_termios.c_oflag;
  47       termios_p->c_cflag = k_termios.c_cflag;
  48       termios_p->c_lflag = k_termios.c_lflag;
  49       termios_p->c_line = k_termios.c_line;
  50 #ifdef _HAVE_STRUCT_TERMIOS_C_ISPEED
  51 # ifdef _HAVE_C_ISPEED
  52       termios_p->c_ispeed = k_termios.c_ispeed;
  53 # else
  54       termios_p->c_ispeed = k_termios.c_cflag & (CBAUD | CBAUDEX);
  55 # endif
  56 #endif
  57 #ifdef _HAVE_STRUCT_TERMIOS_C_OSPEED
  58 # ifdef _HAVE_C_OSPEED
  59       termios_p->c_ospeed = k_termios.c_ospeed;
  60 # else
  61       termios_p->c_ospeed = k_termios.c_cflag & (CBAUD | CBAUDEX);
  62 # endif
  63 #endif
  64       if (sizeof (cc_t) == 1 || _POSIX_VDISABLE == 0
  65           || (unsigned char) _POSIX_VDISABLE == (unsigned char) -1)
  66         memset (__mempcpy (&termios_p->c_cc[0], &k_termios.c_cc[0],
  67                            __KERNEL_NCCS * sizeof (cc_t)),
  68                 _POSIX_VDISABLE, (NCCS - __KERNEL_NCCS) * sizeof (cc_t));
  69       else
  70         {
  71           memcpy (&termios_p->c_cc[0], &k_termios.c_cc[0],
  72                   __KERNEL_NCCS * sizeof (cc_t));
  73
  74           for (size_t cnt = __KERNEL_NCCS; cnt < NCCS; ++cnt)
  75             termios_p->c_cc[cnt] = _POSIX_VDISABLE;
  76         }
  77     }
  78
  79   return retval;
  80 }
  81
  82 weak_alias (__tcgetattr, tcgetattr)