Kernel: Support FIONBIO ioctl

kernel/include/kernel/OpenFileDescriptorSet.h

@@ -34,6 +34,7 @@ namespace Kernel
 		BAN::ErrorOr<int> dup2(int, int);
 
 		BAN::ErrorOr<int> fcntl(int fd, int cmd, uintptr_t extra);
+		BAN::ErrorOr<long> ioctl(int fd, unsigned long request, void* arg);
 
 		BAN::ErrorOr<off_t> seek(int fd, off_t offset, int whence);
 		BAN::ErrorOr<off_t> tell(int) const;

kernel/kernel/OpenFileDescriptorSet.cpp

@@ -354,6 +354,35 @@ namespace Kernel
 		return BAN::Error::from_errno(ENOTSUP);
 	}
 
+	BAN::ErrorOr<long> OpenFileDescriptorSet::ioctl(int fd, unsigned long request, void* arg)
+	{
+		BAN::RefPtr<Inode> inode;
+
+		{
+			LockGuard _(m_mutex);
+
+			TRY(validate_fd(fd));
+
+			switch (request)
+			{
+				case FIONBIO:
+				{
+					int enabled;
+					TRY(read_from_user(arg, &enabled, sizeof(int)));
+					if (enabled)
+						m_open_files[fd]->status_flags |= O_NONBLOCK;
+					else
+						m_open_files[fd]->status_flags &= ~O_NONBLOCK;
+					return 0;
+				}
+			}
+
+			inode = m_open_files[fd]->file.inode;
+		}
+
+		return inode->ioctl(request, arg);
+	}
+
 	BAN::ErrorOr<off_t> OpenFileDescriptorSet::seek(int fd, off_t offset, int whence)
 	{
 		LockGuard _(m_mutex);

kernel/kernel/Process.cpp

@@ -2049,8 +2049,7 @@ namespace Kernel
 
 	BAN::ErrorOr<long> Process::sys_ioctl(int fildes, unsigned long request, void* arg)
 	{
-		auto inode = TRY(m_open_file_descriptors.inode_of(fildes));
-		return TRY(inode->ioctl(request, arg));
+		return m_open_file_descriptors.ioctl(fildes, request, arg);
 	}
 
 	BAN::ErrorOr<long> Process::sys_pselect(sys_pselect_t* user_arguments)