sysdeps/unix/sysv/linux/tcsetattr.c

   1 /* Copyright (C) 1993, 1996, 1997 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 Library General Public License as
   6    published by the Free Software Foundation; either version 2 of the
   7    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    Library General Public License for more details.
  13
  14    You should have received a copy of the GNU Library General Public
  15    License along with the GNU C Library; see the file COPYING.LIB.  If not,
  16    write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  17    Boston, MA 02111-1307, USA.  */
  18
  19 #include <errno.h>
  20 #include <termios.h>
  21 #include <sys/ioctl.h>
  22 #include <sys/types.h>
  23
  24 /* The difference here is that the termios structure used in the
  25    kernel is not the same as we use in the libc.  Therefore we must
  26    translate it here.  */
  27 #include <sys/kernel_termios.h>
  28
  29
  30 /* Set the state of FD to *TERMIOS_P.  */
  31 int
  32 tcsetattr (fd, optional_actions, termios_p)
  33      int fd;
  34      int optional_actions;
  35      const struct termios *termios_p;
  36 {
  37   struct __kernel_termios k_termios;
  38   unsigned long int cmd;
  39   size_t cnt;
  40
  41   switch (optional_actions)
  42     {
  43     case TCSANOW:
  44       cmd = TCSETS;
  45       break;
  46     case TCSADRAIN:
  47       cmd = TCSETSW;
  48       break;
  49     case TCSAFLUSH:
  50       cmd = TCSETSF;
  51       break;
  52     default:
  53       __set_errno (EINVAL);
  54       return -1;
  55     }
  56
  57   k_termios.c_iflag = termios_p->c_iflag;
  58   k_termios.c_oflag = termios_p->c_oflag;
  59   k_termios.c_cflag = termios_p->c_cflag;
  60   k_termios.c_lflag = termios_p->c_lflag;
  61   k_termios.c_line = termios_p->c_line;
  62 #ifdef _HAVE_C_ISPEED
  63   k_termios.c_ispeed = termios_p->c_ispeed;
  64 #endif
  65 #ifdef _HAVE_C_OSPEED
  66   k_termios.c_ospeed = termios_p->c_ospeed;
  67 #endif
  68   for (cnt = 0; cnt < __KERNEL_NCCS; ++cnt)
  69     k_termios.c_cc[cnt] = termios_p->c_cc[cnt];
  70
  71   return __ioctl (fd, cmd, &k_termios);
  72 }