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Kernel+LibC: Implement FIONREAD ioctl

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FIONREAD gets the number of bytes availible to read from a file
descriptor without blocking. I only implemented it for regular files and
sockets
This commit is contained in:
Peter Elliott 2021-07-26 23:06:22 -06:00 • committed by Andreas Kling
parent db92e66902
commit 39a77559f1
7 changed files with 38 additions and 4 deletions
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9
Kernel/FileSystem/InodeFile.cpp
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@ -64,8 +64,6 @@ KResultOr<size_t> InodeFile::write(FileDescription& description, u64 offset, con
KResult InodeFile::ioctl(FileDescription& description, unsigned request, Userspace<void*> arg)
{
(void)description;
switch (request) {
case FIBMAP: {
if (!Process::current().is_superuser())
@ -88,6 +86,13 @@ KResult InodeFile::ioctl(FileDescription& description, unsigned request, Userspa
return KSuccess;
}
case FIONREAD: {
int remaining_bytes = inode().size() - description.offset();
if (!copy_to_user(Userspace<int*>(arg), &remaining_bytes))
return EFAULT;
return KSuccess;
}
default:
return EINVAL;
}