diff --git a/sortix/Makefile b/sortix/Makefile
index fa94b66d..cadd2f8f 100644
--- a/sortix/Makefile
+++ b/sortix/Makefile
@@ -96,6 +96,7 @@ fs/kram.o \
fs/null.o \
fs/user.o \
fs/util.o \
+fs/zero.o \
identity.o \
initrd.o \
inode.o \
diff --git a/sortix/fs/zero.cpp b/sortix/fs/zero.cpp
new file mode 100644
index 00000000..a50435cf
--- /dev/null
+++ b/sortix/fs/zero.cpp
@@ -0,0 +1,102 @@
+/*******************************************************************************
+
+ Copyright(C) Jonas 'Sortie' Termansen 2013.
+
+ This file is part of Sortix.
+
+ Sortix is free software: you can redistribute it and/or modify it under the
+ terms of the GNU General Public License as published by the Free Software
+ Foundation, either version 3 of the License, or (at your option) any later
+ version.
+
+ Sortix is distributed in the hope that it will be useful, but WITHOUT ANY
+ WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
+ details.
+
+ You should have received a copy of the GNU General Public License along with
+ Sortix. If not, see .
+
+ fs/zero.cpp
+ Bit bucket special device.
+
+*******************************************************************************/
+
+#include
+
+#include
+#include
+
+#include
+
+#include
+#include
+
+#include "zero.h"
+
+namespace Sortix {
+
+Zero::Zero(dev_t dev, ino_t ino, uid_t owner, gid_t group, mode_t mode)
+{
+ inode_type = INODE_TYPE_STREAM;
+ if ( !dev )
+ dev = (dev_t) this;
+ if ( !ino )
+ ino = (ino_t) this;
+ this->type = S_IFCHR;
+ this->stat_uid = owner;
+ this->stat_gid = group;
+ this->stat_mode = (mode & S_SETABLE) | this->type;
+ this->stat_size = 0;
+ this->stat_blksize = 1;
+ this->dev = dev;
+ this->ino = ino;
+}
+
+Zero::~Zero()
+{
+}
+
+int Zero::truncate(ioctx_t* /*ctx*/, off_t /*length*/)
+{
+ return 0;
+}
+
+off_t Zero::lseek(ioctx_t* /*ctx*/, off_t offset, int /*whence*/)
+{
+ return offset;
+}
+
+ssize_t Zero::read(ioctx_t* ctx, uint8_t* buf, size_t count)
+{
+ const size_t ZERO_MEM_SIZE = 128;
+ uint8_t zero_mem[ZERO_MEM_SIZE];
+ memset(zero_mem, 0, ZERO_MEM_SIZE);
+ size_t sofar = 0;
+ while ( sofar < count )
+ {
+ size_t left = count - sofar;
+ size_t amount = left < ZERO_MEM_SIZE ? left : ZERO_MEM_SIZE;
+ ctx->copy_to_dest(buf + sofar, zero_mem, amount);
+ sofar += amount;
+ }
+ return (ssize_t) sofar;
+}
+
+ssize_t Zero::pread(ioctx_t* ctx, uint8_t* buf, size_t count, off_t /*off*/)
+{
+ return read(ctx, buf, count);
+}
+
+ssize_t Zero::write(ioctx_t* /*ctx*/, const uint8_t* /*buf*/, size_t count)
+{
+ return count;
+}
+
+ssize_t Zero::pwrite(ioctx_t* /*ctx*/, const uint8_t* /*buf*/, size_t count,
+ off_t /*off*/)
+{
+ return count;
+}
+
+} // namespace Sortix
diff --git a/sortix/fs/zero.h b/sortix/fs/zero.h
new file mode 100644
index 00000000..400b413e
--- /dev/null
+++ b/sortix/fs/zero.h
@@ -0,0 +1,48 @@
+/*******************************************************************************
+
+ Copyright(C) Jonas 'Sortie' Termansen 2013.
+
+ This file is part of Sortix.
+
+ Sortix is free software: you can redistribute it and/or modify it under the
+ terms of the GNU General Public License as published by the Free Software
+ Foundation, either version 3 of the License, or (at your option) any later
+ version.
+
+ Sortix is distributed in the hope that it will be useful, but WITHOUT ANY
+ WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
+ details.
+
+ You should have received a copy of the GNU General Public License along with
+ Sortix. If not, see .
+
+ fs/zero.h
+ Bit bucket special device.
+
+*******************************************************************************/
+
+#ifndef SORTIX_FS_ZERO_H
+#define SORTIX_FS_ZERO_H
+
+#include
+
+namespace Sortix {
+
+class Zero : public AbstractInode
+{
+public:
+ Zero(dev_t dev, ino_t ino, uid_t owner, gid_t group, mode_t mode);
+ virtual ~Zero();
+ virtual int truncate(ioctx_t* ctx, off_t length);
+ virtual off_t lseek(ioctx_t* ctx, off_t offset, int whence);
+ virtual ssize_t read(ioctx_t* ctx, uint8_t* buf, size_t count);
+ virtual ssize_t pread(ioctx_t* ctx, uint8_t* buf, size_t count, off_t off);
+ virtual ssize_t write(ioctx_t* ctx, const uint8_t* buf, size_t count);
+ virtual ssize_t pwrite(ioctx_t* ctx, const uint8_t* buf, size_t count,
+ off_t off);
+};
+
+} // namespace Sortix
+
+#endif
diff --git a/sortix/kernel.cpp b/sortix/kernel.cpp
index 16912075..bb6f1e0f 100644
--- a/sortix/kernel.cpp
+++ b/sortix/kernel.cpp
@@ -75,6 +75,7 @@
#include "fs/kram.h"
#include "fs/null.h"
#include "fs/user.h"
+#include "fs/zero.h"
#include "identity.h"
#include "initrd.h"
#include "io.h"
@@ -538,6 +539,14 @@ static void BootThread(void* /*user*/)
if ( LinkInodeInDir(&ctx, slashdev, "null", null_device) != 0 )
Panic("Unable to link /dev/null to the null device.");
+ // Register the zero device as /dev/zero.
+ Ref zero_device(new Zero(slashdev->dev, (ino_t) 0, (uid_t) 0,
+ (gid_t) 0, (mode_t) 0666));
+ if ( !zero_device )
+ Panic("Could not allocate a zero device");
+ if ( LinkInodeInDir(&ctx, slashdev, "zero", zero_device) != 0 )
+ Panic("Unable to link /dev/zero to the zero device.");
+
// Initialize the COM ports.
COM::Init("/dev", slashdev);