About DosPacket "ACTION_CURRENT_VOLUME" (Solved +)

4 posts / 0 new
Log in or register to post comments
Last post
Fri, 2026-04-10 15:57
#1
OldFart
OldFart's picture
Offline
Last seen: 6 hours 51 min ago
Joined: 2010-11-30 14:09
About DosPacket "ACTION_CURRENT_VOLUME" (Solved +)

Hi,

According to "dos/extents.h" "ACTION_CURRENT_VOLUME" is deprecated. Ok, but what exactly did it return and what is the alternative/OS4.0 way of obtaining that same info?

Regards
OldFart

Top
Sun, 2026-04-12 10:57
OldFart
OldFart's picture
Offline
Last seen: 6 hours 51 min ago
Joined: 2010-11-30 14:09
Re: About DosPacket "ACTION_CURRENT_VOLUME" (Solved)

Hi,

I may have solved this puzzle by invoking IDOS->FindDosEntry(). Results are looking good

Part of the code applied:

  1. struct VolumeNode *VN;
  2.  
  3.  (__PD)->pd_DosList = IDOS->LockDosList(LDF_DEVICES | LDF_VOLUMES | LDF_READ);
  4.  
  5.  while (((__PD)->pd_DosList = IDOS->NextDosEntry((__PD)->pd_DosList, LDF_DEVICES)) != NULL)
  6.   {
  7.    if (
  8.        ((__DN)->dn_Startup != ZERO) &&
  9.        ((__DN)->dn_Port    != NULL) &&
  10.        ((VN =(struct VolumeNode *)IDOS->FindDosEntry((__PD)->pd_DosList, (CONST_STRPTR)_CSTR((__DN)->dn_Name), LDF_VOLUMES)) != NULL)
  11.       )
  12.     {
  13.      /*
  14.      ** Perform further madzjiq here...
  15.      */
  16.     }
  17.   }
  18.  
  19.  IDOS->UnLockDosList(LDF_DEVICES | LDF_VOLUMES | LDF_READ);

OldFart

Top
Sun, 2026-04-12 17:29
(Reply to #2)
OldFart
OldFart's picture
Offline
Last seen: 6 hours 51 min ago
Joined: 2010-11-30 14:09
Re: About DosPacket "ACTION_CURRENT_VOLUME" (Solved)

Sorry foax! It didn't work out as I had expected.

I expected IDOS->FindDosEntry() to use the same 'Name'. Didn't work that way.

So I conjured up a function of my own, which looks for an identical port address in VolumeNodes and lo' and behold: it works (verified)!

  1.  struct VolumeNode *VN;
  2.  
  3.  (__PD)->pd_DosList = IDOS->LockDosList(LDF_DEVICES | LDF_VOLUMES | LDF_READ);
  4.  
  5.  while (((__PD)->pd_DosList = IDOS->NextDosEntry((__PD)->pd_DosList, LDF_DEVICES)) != NULL)
  6.   {
  7.    if (
  8.        ((__DN)->dn_Startup != ZERO) &&
  9.        ((__DN)->dn_Port    != NULL) &&
  10.        ((VN = (struct VolumeNode *)Find_VolumeNode(xn)) != NULL)
  11.       )
  12.     {
  13.      /*
  14.      ** Perform further madzjiq here...
  15.      */
  16.     }
  17.   }
  18.  
  19.  IDOS->UnLockDosList(LDF_DEVICES | LDF_VOLUMES | LDF_READ);
  20.  
  21.  
  22. struct DosList *Find_VolumeNode(struct ExecParam *xn)
  23. {
  24. INFO_ENTER
  25.  
  26.  struct DosList *DOL = IDOS->LockDosList(LDF_VOLUMES | LDF_READ);
  27.  
  28.  if (DOL != NULL)
  29.   {
  30.    while (
  31.           ((DOL = IDOS->NextDosEntry(DOL, LDF_VOLUMES)) != NULL) &&
  32.           (DOL->dol_Port != (__DN)->dn_Port)
  33.          )
  34.     {
  35.      ;
  36.     }
  37.  
  38.    IDOS->UnLockDosList(LDF_VOLUMES | LDF_READ);
  39.   }
  40.  
  41. INFO_VACATE
  42.  return DOL;
  43. }

Hilarious, what?

OldFart

Top
Tue, 2026-04-21 05:41
cwenzel
cwenzel's picture
Offline
Last seen: 1 week 5 days ago
Joined: 2021-01-12 07:05
Re: About DosPacket "ACTION_CURRENT_VOLUME" (Solved +)

One may ask WHY ?
Are you just trying to make Rube Goldberg machine or something ?

All the dospacket info is in; dos.dospackets.doc

If you are seriously trying to get access to the volume node for a mounted volume,
you only need to use Lock(), then do some basic field validation for safety.
Here's an example to get the volume node datestamp...

  1. int32 get_volnode_datestamp( STRPTR name,  struct DateStamp *ds )
  2. {
  3.     int32 result   = FALSE;
  4.     BPTR blk     = IDOS->Lock(name,SHARED_LOCK);
  5.  
  6.     /*
  7.     ** clear down datestamp for failure condition
  8.     ** rather than returning random trash.
  9.     */
  10.     ds->ds_Days   = 0;
  11.     ds->ds_Minute = 0;
  12.     ds->ds_Tick   = 0;
  13.  
  14.     if( blk )
  15.     {
  16.         struct Lock *lock     = BADDR(blk);
  17.         struct VolumeNode *vn = BADDR(lock->fl_Volume); 
  18.  
  19.         if( vn )  /* may be NULL or points to something else wierd */
  20.         {
  21.             if( DLT_VOLUME == vn->vn_Type )  /* check type */
  22.             {
  23.                 if( lock->fl_Port == vn->vn_Port )  /* check port */
  24.                 {
  25.                     ds->ds_Days   = vn->vn_VolumeDate.ds_Days;
  26.                     ds->ds_Minute = vn->vn_VolumeDate.ds_Minute;
  27.                     ds->ds_Tick   = vn->vn_VolumeDate.ds_Tick;
  28.  
  29.                     result = TRUE;
  30.                 }
  31.             }
  32.        }
  33.  
  34.        IDOS->UnLock(blk);
  35.     }
  36.  
  37.     return(result);
  38. }
Top
Log in or register to post comments