libgfortran/io/close.c

   1 /* Copyright (C) 2002-2021 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 #if !HAVE_UNLINK_OPEN_FILE
  30 #include <string.h>
  31 #endif
  32
  33 typedef enum
  34 { CLOSE_INVALID = - 1, CLOSE_DELETE, CLOSE_KEEP, CLOSE_UNSPECIFIED }
  35 close_status;
  36
  37 static const st_option status_opt[] = {
  38   {"keep", CLOSE_KEEP},
  39   {"delete", CLOSE_DELETE},
  40   {NULL, 0}
  41 };
  42
  43
  44 extern void st_close (st_parameter_close *);
  45 export_proto(st_close);
  46
  47 void
  48 st_close (st_parameter_close *clp)
  49 {
  50   close_status status;
  51   gfc_unit *u;
  52 #if !HAVE_UNLINK_OPEN_FILE
  53   char *path;
  54
  55   path = NULL;
  56 #endif
  57
  58   library_start (&clp->common);
  59
  60   status = !(clp->common.flags & IOPARM_CLOSE_HAS_STATUS) ? CLOSE_UNSPECIFIED :
  61     find_option (&clp->common, clp->status, clp->status_len,
  62                  status_opt, "Bad STATUS parameter in CLOSE statement");
  63
  64   if (status == CLOSE_INVALID)
  65     {
  66       library_end ();
  67       return;
  68     }
  69
  70   u = find_unit (clp->common.unit);
  71
  72   if (ASYNC_IO && u && u->au)
  73     if (async_wait (&(clp->common), u->au))
  74       {
  75         library_end ();
  76         return;
  77       }
  78
  79   if ((clp->common.flags & IOPARM_LIBRETURN_MASK) != IOPARM_LIBRETURN_OK)
  80   {
  81     library_end ();
  82     return;
  83   }
  84
  85   if (u != NULL)
  86     {
  87       if (close_share (u) < 0)
  88         generate_error (&clp->common, LIBERROR_OS, "Problem in CLOSE");
  89       if (u->flags.status == STATUS_SCRATCH)
  90         {
  91           if (status == CLOSE_KEEP)
  92             generate_error (&clp->common, LIBERROR_BAD_OPTION,
  93                             "Can't KEEP a scratch file on CLOSE");
  94 #if !HAVE_UNLINK_OPEN_FILE
  95           path = strdup (u->filename);
  96 #endif
  97         }
  98       else
  99         {
 100           if (status == CLOSE_DELETE)
 101             {
 102               if (u->flags.readonly)
 103                 generate_warning (&clp->common, "STATUS set to DELETE on CLOSE"
 104                                   " but file protected by READONLY specifier");
 105               else
 106                 {
 107 #if HAVE_UNLINK_OPEN_FILE
 108
 109                   if (remove (u->filename))
 110                     generate_error (&clp->common, LIBERROR_OS,
 111                                     "File cannot be deleted");
 112 #else
 113                   path = strdup (u->filename);
 114 #endif
 115                 }
 116             }
 117         }
 118
 119       close_unit (u);
 120
 121 #if !HAVE_UNLINK_OPEN_FILE
 122       if (path != NULL)
 123         {
 124           if (remove (path))
 125             generate_error (&clp->common, LIBERROR_OS,
 126                             "File cannot be deleted");
 127           free (path);
 128         }
 129 #endif
 130     }
 131
 132   /* CLOSE on unconnected unit is legal and a no-op: F95 std., 9.3.5. */
 133   library_end ();
 134 }