workbench/libs/nonvolatile/nvdisk/nvdisk_init.c

   1 /*
   2     Copyright © 1995-2006, The AROS Development Team. All rights reserved.
   3     $Id$
   4
   5     Desc: Nonvolatile disk based storage library initialization code.
   6     Lang: English
   7 */
   8
   9
  10 #define  DEBUG  1
  11
  12 #include "nvdisk_intern.h"
  13
  14 #include <aros/debug.h>
  15
  16 #include <exec/types.h>
  17 #include <exec/resident.h>
  18 #include <proto/exec.h>
  19 #include <proto/dos.h>
  20 #include <devices/timer.h>
  21 #include <aros/symbolsets.h>
  22
  23 #include <exec/libraries.h>
  24 #include <exec/memory.h>
  25 #include <exec/alerts.h>
  26 #include LC_LIBDEFS_FILE
  27
  28
  29 static int Init(LIBBASETYPEPTR LIBBASE)
  30 {
  31     /*
  32       This function is single-threaded by exec by calling Forbid.
  33       If you break the Forbid() another task may enter this function
  34       at the same time. Take care.
  35     */
  36
  37     BOOL error = TRUE;    // Notice the initialization to 'TRUE' here.
  38     char *temp = NULL;
  39     BPTR locFile;
  40
  41     LIBBASE->nvd_DOSBase = OpenLibrary("dos.library",0);
  42     if (LIBBASE->nvd_DOSBase == NULL)
  43         return 0;
  44
  45     D(bug("Init nvdisk.library\n"));
  46
  47     locFile = Open("SYS:prefs/env-archive/sys/nv_location", MODE_OLDFILE);
  48
  49     D(bug("Getting location\n"));
  50
  51     if(locFile != BNULL)
  52     {
  53         D(bug("Location file exists!\n"));
  54
  55         temp = AllocVec(512, MEMF_CLEAR);
  56
  57         if(temp != NULL)
  58         {
  59             int i = 0;         // Loop variable
  60
  61             Read(locFile, temp, 512);
  62
  63             // End string if a carriage return is encountered
  64             while(temp[i] != 0)
  65             {
  66                 if(temp[i] == '\n')
  67                 {
  68                     temp[i] = 0;
  69                     break;
  70                 }
  71
  72                 i++;
  73             }
  74
  75             nvdBase->nvd_location = Lock(temp, SHARED_LOCK);
  76
  77             D(bug("NV location = %s\n", temp));
  78
  79             FreeVec(temp);
  80         }
  81         Close(locFile);
  82     } else {
  83         /* Volatile mode, if we have no nv_location file */
  84         UnLock(CreateDir("RAM:NVRAM"));
  85         nvdBase->nvd_location = Lock("RAM:NVRAM", SHARED_LOCK);
  86     }
  87
  88     D(bug("Got lock = %p\n", nvdBase->nvd_location));
  89
  90     if(nvdBase->nvd_location != BNULL)
  91     {
  92         error = FALSE;
  93     }
  94
  95     return !error;
  96 }
  97
  98 static int Expunge(LIBBASETYPEPTR LIBBASE)
  99 {
 100     /*
 101         This function is single-threaded by exec by calling Forbid.
 102         Never break the Forbid() or strange things might happen.
 103     */
 104
 105     UnLock(nvdBase->nvd_location);
 106
 107     CloseLibrary(nvdBase->nvd_DOSBase);
 108
 109     return TRUE;
 110 }
 111
 112 ADD2INITLIB(Init, 0);
 113 ADD2EXPUNGELIB(Expunge, 0);