mirror of
https://github.com/LadybirdBrowser/ladybird.git
synced 2024-09-21 10:19:03 +03:00
7a3ab6c517
Instead of returning a ssize_t where negative values mean error, we now return KResultOr<size_t> and use the error state to report errors exclusively.
66 lines
2.5 KiB
C++
66 lines
2.5 KiB
C++
/*
|
|
* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions are met:
|
|
*
|
|
* 1. Redistributions of source code must retain the above copyright notice, this
|
|
* list of conditions and the following disclaimer.
|
|
*
|
|
* 2. Redistributions in binary form must reproduce the above copyright notice,
|
|
* this list of conditions and the following disclaimer in the documentation
|
|
* and/or other materials provided with the distribution.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
|
|
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
|
|
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
|
|
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
|
|
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
|
|
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
|
|
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|
*/
|
|
|
|
#include <Kernel/FileSystem/FileDescription.h>
|
|
#include <Kernel/Process.h>
|
|
|
|
namespace Kernel {
|
|
|
|
ssize_t Process::sys$read(int fd, Userspace<u8*> buffer, ssize_t size)
|
|
{
|
|
REQUIRE_PROMISE(stdio);
|
|
if (size < 0)
|
|
return -EINVAL;
|
|
if (size == 0)
|
|
return 0;
|
|
if (!validate_write(buffer, size))
|
|
return -EFAULT;
|
|
#ifdef DEBUG_IO
|
|
dbg() << "sys$read(" << fd << ", " << (const void*)buffer << ", " << size << ")";
|
|
#endif
|
|
auto description = file_description(fd);
|
|
if (!description)
|
|
return -EBADF;
|
|
if (!description->is_readable())
|
|
return -EBADF;
|
|
if (description->is_directory())
|
|
return -EISDIR;
|
|
if (description->is_blocking()) {
|
|
if (!description->can_read()) {
|
|
if (Thread::current()->block<Thread::ReadBlocker>(nullptr, *description).was_interrupted())
|
|
return -EINTR;
|
|
if (!description->can_read())
|
|
return -EAGAIN;
|
|
}
|
|
}
|
|
auto result = description->read(buffer.unsafe_userspace_ptr(), size);
|
|
if (result.is_error())
|
|
return result.error();
|
|
return result.value();
|
|
}
|
|
|
|
}
|