libgfortran/io/close.c

   1 /* Copyright (C) 2002-2018 Free Software Foundation, Inc.
   2    Contributed by Andy Vaught
   3
   4 This file is part of the GNU Fortran 95 runtime library (libgfortran).
   5
   6 Libgfortran is free software; you can redistribute it and/or modify
   7 it under the terms of the GNU General Public License as published by
   8 the Free Software Foundation; either version 3, or (at your option)
   9 any later version.
  10
  11 Libgfortran is distributed in the hope that it will be useful,
  12 but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 GNU General Public License for more details.
  15
  16 Under Section 7 of GPL version 3, you are granted additional
  17 permissions described in the GCC Runtime Library Exception, version
  18 3.1, as published by the Free Software Foundation.
  19
  20 You should have received a copy of the GNU General Public License and
  21 a copy of the GCC Runtime Library Exception along with this program;
  22 see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
  23 <http://www.gnu.org/licenses/>.  */
  24
  25 #include "io.h"
  26 #include "unix.h"
  27 #include "async.h"
  28 #include <limits.h>
  29
  30 typedef enum
  31 { CLOSE_DELETE, CLOSE_KEEP, CLOSE_UNSPECIFIED }
  32 close_status;
  33
  34 static const st_option status_opt[] = {
  35   {"keep", CLOSE_KEEP},
  36   {"delete", CLOSE_DELETE},
  37   {NULL, 0}
  38 };
  39
  40
  41 extern void st_close (st_parameter_close *);
  42 export_proto(st_close);
  43
  44 void
  45 st_close (st_parameter_close *clp)
  46 {
  47   close_status status;
  48   gfc_unit *u;
  49 #if !HAVE_UNLINK_OPEN_FILE
  50   char *path;
  51
  52   path = NULL;
  53 #endif
  54
  55   library_start (&clp->common);
  56
  57   status = !(clp->common.flags & IOPARM_CLOSE_HAS_STATUS) ? CLOSE_UNSPECIFIED :
  58     find_option (&clp->common, clp->status, clp->status_len,
  59                  status_opt, "Bad STATUS parameter in CLOSE statement");
  60
  61   u = find_unit (clp->common.unit);
  62
  63   if (ASYNC_IO && u && u->au)
  64     if (async_wait (&(clp->common), u->au))
  65       {
  66         library_end ();
  67         return;
  68       }
  69
  70   if ((clp->common.flags & IOPARM_LIBRETURN_MASK) != IOPARM_LIBRETURN_OK)
  71   {
  72     library_end ();
  73     return;
  74   }
  75
  76   if (u != NULL)
  77     {
  78       if (close_share (u) < 0)
  79         generate_error (&clp->common, LIBERROR_OS, "Problem in CLOSE");
  80       if (u->flags.status == STATUS_SCRATCH)
  81         {
  82           if (status == CLOSE_KEEP)
  83             generate_error (&clp->common, LIBERROR_BAD_OPTION,
  84                             "Can't KEEP a scratch file on CLOSE");
  85 #if !HAVE_UNLINK_OPEN_FILE
  86           path = strdup (u->filename);
  87 #endif
  88         }
  89       else
  90         {
  91           if (status == CLOSE_DELETE)
  92             {
  93               if (u->flags.readonly)
  94                 generate_warning (&clp->common, "STATUS set to DELETE on CLOSE"
  95                                   " but file protected by READONLY specifier");
  96               else
  97                 {
  98 #if HAVE_UNLINK_OPEN_FILE
  99                   remove (u->filename);
 100 #else
 101                   path = strdup (u->filename);
 102 #endif
 103                 }
 104             }
 105         }
 106
 107       close_unit (u);
 108
 109 #if !HAVE_UNLINK_OPEN_FILE
 110       if (path != NULL)
 111         {
 112           remove (path);
 113           free (path);
 114         }
 115 #endif
 116     }
 117
 118   /* CLOSE on unconnected unit is legal and a no-op: F95 std., 9.3.5. */
 119   library_end ();
 120 }