winsup/cygwin/ioctl.cc

   1 /* ioctl.cc: ioctl routines.
   2
   3    Written by Doug Evans of Cygnus Support
   4    dje@cygnus.com
   5
   6 This file is part of Cygwin.
   7
   8 This software is a copyrighted work licensed under the terms of the
   9 Cygwin license.  Please consult the file "CYGWIN_LICENSE" for
  10 details. */
  11
  12 #include "winsup.h"
  13 #include "cygerrno.h"
  14 #include "path.h"
  15 #include "fhandler.h"
  16 #include "dtable.h"
  17 #include "cygheap.h"
  18
  19 extern "C" int
  20 ioctl (int fd, int cmd, ...)
  21 {
  22
  23   cygheap_fdget cfd (fd);
  24   if (cfd < 0)
  25     return -1;
  26
  27   /* check for optional mode argument */
  28   va_list ap;
  29   va_start (ap, cmd);
  30   char *argp = va_arg (ap, char *);
  31   va_end (ap);
  32
  33   debug_printf ("ioctl(fd %d, cmd %y)", fd, cmd);
  34   int res;
  35   if (cfd->get_flags () & O_PATH)
  36     {
  37       set_errno (EBADF);
  38       return -1;
  39     }
  40   /* FIXME: This stinks.  There are collisions between cmd types
  41      depending on whether fd is associated with a pty master or not.
  42      Something to fix for Cygwin2.  CGF 2006-06-04 */
  43   if (cfd->is_tty () && cfd->get_major () != DEV_PTYM_MAJOR)
  44     switch (cmd)
  45       {
  46         case TCGETA:
  47           res = tcgetattr (fd, (struct termios *) argp);
  48           goto out;
  49         case TCSETA:
  50           res = tcsetattr (fd, TCSANOW, (struct termios *) argp);
  51           goto out;
  52         case TCSETAW:
  53           res = tcsetattr (fd, TCSADRAIN, (struct termios *) argp);
  54           goto out;
  55         case TCSETAF:
  56           res = tcsetattr (fd, TCSAFLUSH, (struct termios *) argp);
  57           goto out;
  58       }
  59
  60   res = cfd->ioctl (cmd, argp);
  61
  62 out:
  63   syscall_printf ("%R = ioctl(%d, %y, ...)", res, fd, cmd);
  64   return res;
  65 }