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halt.lzh
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unmount.c
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C/C++ Source or Header
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1995-10-06
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3KB
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154 lines
/*
unmount.c --- unmount filesystems.
(c) Copyright 1995 SHW Wabnitz
Written by Bernhard Fastenrath (fasten@shw.com)
This file may be distributed under the terms
of the GNU General Public License.
*/
#include "halt_library.h"
static void
FreeList (List *list)
{
Node *node, *next;
for (next = node = list -> lh_Head; next -> ln_Succ; node = next)
{
next = node -> ln_Succ;
if (node -> ln_Name)
FreeMem (node -> ln_Name, node -> ln_Pri);
FreeMem (node, sizeof (Node));
}
}
static int
PingPong (MsgPort *from, MsgPort *to, StandardPacket *sp,
ULONG action, ULONG arg)
{
sp -> sp_Msg.mn_Node.ln_Name = (char *) &sp -> sp_Pkt;
sp -> sp_Pkt.dp_Link = &sp -> sp_Msg;
sp -> sp_Pkt.dp_Port = from;
sp -> sp_Pkt.dp_Type = action;
sp -> sp_Pkt.dp_Arg1 = arg;
PutMsg (to, &sp -> sp_Msg);
do
WaitPort (from);
while (!GetMsg (from));
return 1;
}
static int
SendToHandler (MsgPort *mp, ULONG ptype, char *handler, ULONG arg)
{
DevProc *dp = NULL;
StandardPacket sp;
int ret = 0;
dp = GetDeviceProc (handler, dp);
if (dp)
{
PingPong (mp, dp -> dvp_Port, &sp, ACTION_IS_FILESYSTEM, 0);
if (sp.sp_Pkt.dp_Res1 == DOSTRUE)
{
PingPong (mp, dp -> dvp_Port, &sp, ptype, arg);
ret = 1;
}
else
ret = -1;
}
FreeDeviceProc (dp);
return ret;
}
static int
SendToAll (MsgPort *mp, ULONG ptype, ULONG arg)
{
List list;
Node *node;
DosInfo *di;
DeviceNode *dn;
int len, out_of_mem = 0;
char *name;
BPTR *pdn;
int ret;
NewList (&list);
Forbid ();
di = BADDR (((RootNode *) DOSBase -> dl_Root) -> rn_Info);
for (pdn = &di -> di_DevInfo; dn = (DeviceNode *) BADDR (*pdn);
pdn = &dn -> dn_Next)
{
if (dn -> dn_Type == DLT_DEVICE)
{
if (node = (Node *) AllocMem (sizeof (Node), MEMF_CLEAR))
{
name = BADDR (dn -> dn_Name);
len = (int) name[0];
if (node -> ln_Name = AllocMem (len + 2, 0))
{
CopyMem (name+1, node -> ln_Name, len);
node -> ln_Name[len] = ':';
node -> ln_Name[len+1] = '\0';
node -> ln_Pri = len + 2;
AddTail (&list, node);
}
else
{
out_of_mem = 1;
FreeMem (node, sizeof (Node));
break;
}
}
else
{
out_of_mem = 1;
break;
}
}
}
Permit ();
if (out_of_mem)
{
FreeList (&list);
return 0;
}
len = 0;
for (node = list.lh_Head; node -> ln_Succ; node = node -> ln_Succ)
ret = SendToHandler (mp, ptype, node -> ln_Name, arg);
FreeList (&list);
return 1;
}
/*** public functions ***/
int
unmount (MsgPort *mp, char *filesystem)
{
ULONG arg = DOSTRUE, ptype = ACTION_INHIBIT;
int free_port = 0, ret;
if (!mp)
{
if (!(mp = CreatePort (NULL, 0)))
return 0;
free_port = 1;
}
if (filesystem)
{
ret = SendToHandler (mp, ptype, filesystem, arg);
}
else
{
ret = SendToAll (mp, ptype, arg);
}
if (free_port)
DeletePort (mp);
return ret;
}