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     D(bug("Init nvdisk.library\n"));
  42
  43     locFile = Open("SYS:prefs/env-archive/sys/nv_location", MODE_OLDFILE);
  44
  45     D(bug("Getting location\n"));
  46
  47     if(locFile != NULL)
  48     {
  49         D(bug("Location file exists!\n"));
  50
  51         temp = AllocVec(512, MEMF_CLEAR);
  52
  53         if(temp != NULL)
  54         {
  55             int i = 0;         // Loop variable
  56
  57             Read(locFile, temp, 512);
  58
  59             // End string if a carriage return is encountered
  60             while(temp[i] != 0)
  61             {
  62                 if(temp[i] == '\n')
  63                 {
  64                     temp[i] = 0;
  65                     break;
  66                 }
  67
  68                 i++;
  69             }
  70
  71             nvdBase->nvd_location = Lock(temp, SHARED_LOCK);
  72
  73             D(bug("NV location = %s\n", temp));
  74
  75             FreeVec(temp);
  76
  77             D(bug("Got lock = %p\n", nvdBase->nvd_location));
  78
  79             if(nvdBase->nvd_location != NULL)
  80             {
  81                 error = FALSE;
  82             }
  83         }
  84
  85         Close(locFile);
  86     }
  87
  88     return !error;
  89 }
  90
  91 static int Expunge(LIBBASETYPEPTR LIBBASE)
  92 {
  93     /*
  94         This function is single-threaded by exec by calling Forbid.
  95         Never break the Forbid() or strange things might happen.
  96     */
  97
  98     UnLock(nvdBase->nvd_location);
  99
 100     return TRUE;
 101 }
 102
 103 ADD2INITLIB(Init, 0);
 104 ADD2EXPUNGELIB(Expunge, 0);