102 lines
2.4 KiB
C++
102 lines
2.4 KiB
C++
/*
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* Copyright (c) 2015 Jonas 'Sortie' Termansen.
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*
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* fs/random.cpp
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* Random device.
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*/
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#include <sys/types.h>
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#include <stdint.h>
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#include <string.h>
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#include <stdlib.h>
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#include <sortix/stat.h>
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#include <sortix/kernel/inode.h>
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#include <sortix/kernel/ioctx.h>
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#include "random.h"
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namespace Sortix {
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DevRandom::DevRandom(dev_t dev, ino_t ino, uid_t owner, gid_t group, mode_t mode)
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{
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inode_type = INODE_TYPE_STREAM;
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if ( !dev )
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dev = (dev_t) this;
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if ( !ino )
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ino = (ino_t) this;
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this->type = S_IFCHR;
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this->stat_uid = owner;
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this->stat_gid = group;
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this->stat_mode = (mode & S_SETABLE) | this->type;
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this->stat_size = 0;
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this->stat_blksize = 1;
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this->dev = dev;
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this->ino = ino;
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}
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DevRandom::~DevRandom()
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{
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}
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int DevRandom::truncate(ioctx_t* /*ctx*/, off_t /*length*/)
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{
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return 0;
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}
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off_t DevRandom::lseek(ioctx_t* /*ctx*/, off_t offset, int /*whence*/)
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{
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return offset;
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}
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ssize_t DevRandom::read(ioctx_t* ctx, uint8_t* buf, size_t count)
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{
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size_t sofar = 0;
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while ( count )
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{
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unsigned char buffer[512];
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size_t amount = count;
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if ( sizeof(buffer) < amount )
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amount = sizeof(buffer);
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arc4random_buf(buffer, amount);
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if ( !ctx->copy_to_dest(buf, buffer, amount) )
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return sofar ? sofar : -1;
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buf += amount;
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count -= amount;
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sofar += amount;
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}
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return (ssize_t) sofar;
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}
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ssize_t DevRandom::pread(ioctx_t* ctx, uint8_t* buf, size_t count, off_t /*off*/)
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{
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return read(ctx, buf, count);
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}
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ssize_t DevRandom::write(ioctx_t* /*ctx*/, const uint8_t* /*buf*/, size_t count)
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{
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return count;
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}
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ssize_t DevRandom::pwrite(ioctx_t* /*ctx*/, const uint8_t* /*buf*/, size_t count,
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off_t /*off*/)
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{
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return count;
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}
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} // namespace Sortix
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