contrib/grep/lib/dup.c

   1 /* Duplicate an open file descriptor.
   2
   3    Copyright (C) 2011-2015 Free Software Foundation, Inc.
   4
   5    This program is free software: you can redistribute it and/or modify
   6    it under the terms of the GNU General Public License as published by
   7    the Free Software Foundation; either version 3 of the License, or
   8    (at your option) any later version.
   9
  10    This program is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13    GNU General Public License for more details.
  14
  15    You should have received a copy of the GNU General Public License
  16    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  17
  18 #include <config.h>
  19
  20 /* Specification.  */
  21 #include <unistd.h>
  22
  23 #include <errno.h>
  24
  25 #include "msvc-inval.h"
  26
  27 #undef dup
  28
  29 #if HAVE_MSVC_INVALID_PARAMETER_HANDLER
  30 static int
  31 dup_nothrow (int fd)
  32 {
  33   int result;
  34
  35   TRY_MSVC_INVAL
  36     {
  37       result = dup (fd);
  38     }
  39   CATCH_MSVC_INVAL
  40     {
  41       result = -1;
  42       errno = EBADF;
  43     }
  44   DONE_MSVC_INVAL;
  45
  46   return result;
  47 }
  48 #else
  49 # define dup_nothrow dup
  50 #endif
  51
  52 int
  53 rpl_dup (int fd)
  54 {
  55   int result = dup_nothrow (fd);
  56 #if REPLACE_FCHDIR
  57   if (result >= 0)
  58     result = _gl_register_dup (fd, result);
  59 #endif
  60   return result;
  61 }