mirror of
https://github.com/LadybirdBrowser/ladybird.git
synced 2024-11-08 04:50:08 +03:00
286984750e
Now that support for 32-bit x86 has been removed, we don't have to worry about the top half of `off_t`/`u64` values being chopped off when we try to pass them in registers. Therefore, we no longer need the workaround of pointers to stack-allocated values to syscalls. Note that this changes the system call ABI, so statically linked programs will have to be re-linked.
63 lines
1.9 KiB
C++
63 lines
1.9 KiB
C++
/*
|
|
* Copyright (c) 2022, Leon Albrecht <leon.a@serenityos.org>
|
|
*
|
|
* SPDX-License-Identifier: BSD-2-Clause
|
|
*/
|
|
|
|
#include <AK/Checked.h>
|
|
#include <Kernel/FileSystem/Inode.h>
|
|
#include <Kernel/FileSystem/InodeFile.h>
|
|
#include <Kernel/FileSystem/OpenFileDescription.h>
|
|
#include <Kernel/Tasks/Process.h>
|
|
|
|
namespace Kernel {
|
|
|
|
// https://pubs.opengroup.org/onlinepubs/9699919799/functions/posix_fallocate.html
|
|
ErrorOr<FlatPtr> Process::sys$posix_fallocate(int fd, off_t offset, off_t length)
|
|
{
|
|
VERIFY_NO_PROCESS_BIG_LOCK(this);
|
|
TRY(require_promise(Pledge::stdio));
|
|
|
|
// [EINVAL] The len argument is less than zero, or the offset argument is less than zero, or the underlying file system does not support this operation.
|
|
if (offset < 0)
|
|
return EINVAL;
|
|
if (length <= 0)
|
|
return EINVAL;
|
|
|
|
Checked<size_t> checked_size { length };
|
|
checked_size += offset;
|
|
// FIXME: Return EFBIG if offset+length > FileSizeMax
|
|
if (checked_size.has_overflow())
|
|
return EFBIG;
|
|
|
|
auto description = TRY(open_file_description(fd));
|
|
|
|
// [EBADF] The fd argument references a file that was opened without write permission.
|
|
if (!description->is_writable())
|
|
return EBADF;
|
|
|
|
// [ESPIPE] The fd argument is associated with a pipe or FIFO.
|
|
if (description->is_fifo())
|
|
return ESPIPE;
|
|
|
|
// [ENODEV] The fd argument does not refer to a regular file.
|
|
if (!description->file().is_regular_file())
|
|
return ENODEV;
|
|
|
|
VERIFY(description->file().is_inode());
|
|
|
|
auto& file = static_cast<InodeFile&>(description->file());
|
|
if (file.inode().size() >= checked_size.value())
|
|
return 0;
|
|
|
|
// Note: truncate essentially calls resize in the inodes implementation
|
|
// while resize is not a standard member of an inode, so we just call
|
|
// truncate instead
|
|
TRY(file.inode().truncate(checked_size.value()));
|
|
|
|
// FIXME: EINTR: A signal was caught during execution.
|
|
return 0;
|
|
}
|
|
|
|
}
|