C++ (Cpp) proc_fd Beispiele

Beispiel #1

Datei: fd.c Projekt: adyjl/DORIMANX_LG_STOCK_LP_KERNEL

static int proc_fd_link(struct dentry *dentry, struct path *path)
{
	struct files_struct *files = NULL;
	struct task_struct *task;
	int ret = -ENOENT;

	task = get_proc_task(dentry->d_inode);
	if (task) {
		files = get_files_struct(task);
		put_task_struct(task);
	}

	if (files) {
		int fd = proc_fd(dentry->d_inode);
		struct file *fd_file;

		spin_lock(&files->file_lock);
		fd_file = fcheck_files(files, fd);
		if (fd_file) {
			*path = fd_file->f_path;
			path_get(&fd_file->f_path);
			ret = 0;
		}
		spin_unlock(&files->file_lock);
		put_files_struct(files);
	}

	return ret;
}

Beispiel #2

Datei: fd.c Projekt: LBSHackathon/linux

static int tid_fd_revalidate(struct dentry *dentry, unsigned int flags)
{
	struct files_struct *files;
	struct task_struct *task;
	const struct cred *cred;
	struct inode *inode;
	int fd;

	if (flags & LOOKUP_RCU)
		return -ECHILD;

	inode = dentry->d_inode;
	task = get_proc_task(inode);
	fd = proc_fd(inode);

	if (task) {
		files = get_files_struct(task);
		if (files) {
			struct file *file;

			rcu_read_lock();
			file = fcheck_files(files, fd);
			if (file) {
				unsigned f_mode = file->f_mode;

				rcu_read_unlock();
				put_files_struct(files);

				if (task_dumpable(task)) {
					rcu_read_lock();
					cred = __task_cred(task);
					inode->i_uid = cred->euid;
					inode->i_gid = cred->egid;
					rcu_read_unlock();
				} else {
					inode->i_uid = GLOBAL_ROOT_UID;
					inode->i_gid = GLOBAL_ROOT_GID;
				}

				if (S_ISLNK(inode->i_mode)) {
					unsigned i_mode = S_IFLNK;
					if (f_mode & FMODE_READ)
						i_mode |= S_IRUSR | S_IXUSR;
					if (f_mode & FMODE_WRITE)
						i_mode |= S_IWUSR | S_IXUSR;
					inode->i_mode = i_mode;
				}

				security_task_to_inode(task, inode);
				put_task_struct(task);
				return 1;
			}
			rcu_read_unlock();
			put_files_struct(files);
		}
		put_task_struct(task);
	}
	return 0;
}

Beispiel #3

Datei: fd.c Projekt: AshishNamdev/linux

static int tid_fd_revalidate(struct dentry *dentry, unsigned int flags)
{
	struct files_struct *files;
	struct task_struct *task;
	struct inode *inode;
	unsigned int fd;

	if (flags & LOOKUP_RCU)
		return -ECHILD;

	inode = d_inode(dentry);
	task = get_proc_task(inode);
	fd = proc_fd(inode);

	if (task) {
		files = get_files_struct(task);
		if (files) {
			struct file *file;

			rcu_read_lock();
			file = fcheck_files(files, fd);
			if (file) {
				unsigned f_mode = file->f_mode;

				rcu_read_unlock();
				put_files_struct(files);

				task_dump_owner(task, 0, &inode->i_uid, &inode->i_gid);

				if (S_ISLNK(inode->i_mode)) {
					unsigned i_mode = S_IFLNK;
					if (f_mode & FMODE_READ)
						i_mode |= S_IRUSR | S_IXUSR;
					if (f_mode & FMODE_WRITE)
						i_mode |= S_IWUSR | S_IXUSR;
					inode->i_mode = i_mode;
				}

				security_task_to_inode(task, inode);
				put_task_struct(task);
				return 1;
			}
			rcu_read_unlock();
			put_files_struct(files);
		}
		put_task_struct(task);
	}
	return 0;
}