com32/lib/sys/close.c

   1 /* ----------------------------------------------------------------------- *
   2  *
   3  *   Copyright 2004 H. Peter Anvin - All Rights Reserved
   4  *
   5  *   Permission is hereby granted, free of charge, to any person
   6  *   obtaining a copy of this software and associated documentation
   7  *   files (the "Software"), to deal in the Software without
   8  *   restriction, including without limitation the rights to use,
   9  *   copy, modify, merge, publish, distribute, sublicense, and/or
  10  *   sell copies of the Software, and to permit persons to whom
  11  *   the Software is furnished to do so, subject to the following
  12  *   conditions:
  13  *
  14  *   The above copyright notice and this permission notice shall
  15  *   be included in all copies or substantial portions of the Software.
  16  *
  17  *   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  18  *   EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
  19  *   OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  20  *   NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
  21  *   HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
  22  *   WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  23  *   FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
  24  *   OTHER DEALINGS IN THE SOFTWARE.
  25  *
  26  * ----------------------------------------------------------------------- */
  27
  28 /*
  29  * close.c
  30  */
  31
  32 #include <errno.h>
  33 #include <com32.h>
  34 #include <string.h>
  35 #include "file.h"
  36
  37 int close(int fd)
  38 {
  39   struct file_info *fp = &__file_info[fd];
  40   int rv = 0;
  41
  42   if ( fd >= NFILES || !fp->iop || !fp->oop ) {
  43     errno = EBADF;
  44     return -1;
  45   }
  46
  47   if ( fp->iop->close ) {
  48     rv = fp->iop->close(fp);
  49     if ( rv )
  50       return rv;
  51   }
  52   fp->iop = &dev_error_r;
  53
  54   if ( fp->oop->close ) {
  55     rv = fp->oop->close(fp);
  56     if ( rv )
  57       return rv;
  58   }
  59
  60   memset(fp, 0, sizeof *fp);    /* File structure unused */
  61   return 0;
  62 }