Also got rid of trailing white space. That corrupted .git/. Big ass-commit because of recovered .git directory.
177 lines
3.9 KiB
C++
177 lines
3.9 KiB
C++
/*******************************************************************************
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COPYRIGHT(C) JONAS 'SORTIE' TERMANSEN 2012.
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This file is part of Sortix.
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Sortix is free software: you can redistribute it and/or modify it under the
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terms of the GNU General Public License as published by the Free Software
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Foundation, either version 3 of the License, or (at your option) any later
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version.
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Sortix is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
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details.
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You should have received a copy of the GNU General Public License along with
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Sortix. If not, see <http://www.gnu.org/licenses/>.
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descriptors.cpp
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Handles file descriptors, socket descriptors, and whatnot for each process.
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*******************************************************************************/
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#include <sortix/kernel/platform.h>
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#include <libmaxsi/memory.h>
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#include "descriptors.h"
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#include "device.h"
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#include <sortix/fcntl.h>
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using namespace Maxsi;
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namespace Sortix
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{
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// When in doubt use brute-force. This class could easily be optimized.
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Device* const RESERVED_DEVICE = (Device*) 0x1UL;
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DescriptorTable::DescriptorTable()
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{
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numdevices = 0;
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devices = NULL;
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}
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DescriptorTable::~DescriptorTable()
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{
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Reset();
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}
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void DescriptorTable::Reset()
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{
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for ( int i = 0; i < numdevices; i++ )
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{
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Device* dev = devices[i].dev;
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if ( !dev || dev == RESERVED_DEVICE ) { continue; }
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dev->Unref();
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}
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delete[] devices;
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devices = NULL;
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numdevices = 0;
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}
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int DescriptorTable::Allocate(Device* object)
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{
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for ( int i = 0; i < numdevices; i++ )
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{
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if ( !devices[i].dev )
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{
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object->Refer();
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devices[i].dev = object;
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devices[i].flags = 0;
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return i;
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}
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}
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int newlistlength = numdevices*2;
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if ( newlistlength == 0 ) { newlistlength = 8; }
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DescriptorEntry* newlist = new DescriptorEntry[newlistlength];
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if ( newlist == NULL ) { return -1; }
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if ( devices != NULL )
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{
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Memory::Copy(newlist, devices, sizeof(*devices) * numdevices);
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}
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size_t numpadded = newlistlength-numdevices;
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Memory::Set(newlist + numdevices, 0, sizeof(*devices) * numpadded);
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delete[] devices;
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devices = newlist;
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numdevices = newlistlength;
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return Allocate(object);
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}
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void DescriptorTable::Free(int index)
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{
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ASSERT(index < numdevices);
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ASSERT(devices[index].dev);
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if ( devices[index].dev != RESERVED_DEVICE )
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{
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devices[index].dev->Unref();
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}
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devices[index].dev = NULL;
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devices[index].flags = 0;
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}
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int DescriptorTable::Reserve()
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{
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return Allocate(RESERVED_DEVICE);
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}
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void DescriptorTable::UseReservation(int index, Device* object)
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{
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ASSERT(index < index);
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ASSERT(devices[index].dev != NULL);
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ASSERT(devices[index].dev == RESERVED_DEVICE);
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object->Refer();
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devices[index].dev = object;
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devices[index].flags = 0;
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}
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bool DescriptorTable::Fork(DescriptorTable* forkinto)
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{
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DescriptorEntry* newlist = new DescriptorEntry[numdevices];
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if ( !newlist ) { return false; }
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for ( int i = 0; i < numdevices; i++ )
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{
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Device* dev = devices[i].dev;
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int flags = devices[i].flags;
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if ( flags & FD_CLOFORK ) { dev = NULL; flags = 0; }
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newlist[i].dev = dev;
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newlist[i].flags = flags;
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if ( !dev || dev == RESERVED_DEVICE ) { continue; }
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newlist[i].dev->Refer();
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}
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ASSERT(!forkinto->devices);
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forkinto->devices = newlist;
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forkinto->numdevices = numdevices;
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return true;
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}
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void DescriptorTable::OnExecute()
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{
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for ( int i = 0; i < numdevices; i++ )
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{
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if ( devices[i].flags & FD_CLOEXEC ) { Free(i); }
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}
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}
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void DescriptorTable::SetFlags(int index, int flags)
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{
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ASSERT(0 <= index && index < numdevices);
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ASSERT(devices[index].dev);
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devices[index].flags = flags;
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}
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int DescriptorTable::GetFlags(int index)
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{
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ASSERT(0 <= index && index < numdevices);
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ASSERT(devices[index].dev);
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return devices[index].flags;
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}
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}
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