--- /dev/null
+/*
+ * Copyright (C) 2019 Jérémie Galarneau <jeremie.galarneau@efficios.com>
+ *
+ * SPDX-License-Identifier: LGPL-2.1-only
+ *
+ */
+
+#ifndef _COMPAT_DIRECTORY_HANDLE_H
+#define _COMPAT_DIRECTORY_HANDLE_H
+
+#include <common/credentials.hpp>
+#include <common/macros.hpp>
+#include <sys/stat.h>
+#include <urcu/ref.h>
+
+enum lttng_directory_handle_rmdir_recursive_flags {
+ LTTNG_DIRECTORY_HANDLE_FAIL_NON_EMPTY_FLAG = (1U << 0),
+ LTTNG_DIRECTORY_HANDLE_SKIP_NON_EMPTY_FLAG = (1U << 1),
+};
+
+/*
+ * Some platforms, such as Solaris 10, do not support directory file descriptors
+ * and their associated functions (*at(...)), which are defined in POSIX.2008.
+ *
+ * This wrapper provides a handle that is either a copy of a directory's path
+ * or a directory file descriptors, depending on the platform's capabilities.
+ */
+#ifdef HAVE_DIRFD
+
+struct lttng_directory_handle;
+
+typedef void (*lttng_directory_handle_destroy_cb)(
+ struct lttng_directory_handle *handle, void *data);
+
+struct lttng_directory_handle {
+ struct urcu_ref ref;
+ ino_t directory_inode;
+ int dirfd;
+ lttng_directory_handle_destroy_cb destroy_cb;
+ void *destroy_cb_data;
+};
+
+static inline
+int lttng_directory_handle_get_dirfd(
+ const struct lttng_directory_handle *handle)
+{
+ return handle->dirfd;
+}
+
+#else
+struct lttng_directory_handle {
+ struct urcu_ref ref;
+ char *base_path;
+};
+#endif
+
+/*
+ * Create a directory handle to the provided path. Passing a NULL path
+ * returns a handle to the current working directory.
+ *
+ * The reference to the directory handle must be released using
+ * lttng_directory_handle_put().
+ */
+struct lttng_directory_handle *lttng_directory_handle_create(
+ const char *path);
+
+/*
+ * Create a new directory handle to a path relative to an existing handle.
+ *
+ * The provided path must already exist. Note that the creation of a
+ * subdirectory and the creation of a handle are kept as separate operations
+ * to highlight the fact that there is an inherent race between the creation of
+ * a directory and the creation of a handle to it.
+ *
+ * Passing a NULL path effectively copies the original handle.
+ *
+ * The reference to the directory handle must be released using
+ * lttng_directory_handle_put().
+ */
+struct lttng_directory_handle *lttng_directory_handle_create_from_handle(
+ const char *path,
+ const struct lttng_directory_handle *ref_handle);
+
+/*
+ * Create a new directory handle from an existing directory fd.
+ *
+ * The new directory handle assumes the ownership of the directory fd.
+ * Note that this method should only be used in very specific cases, such as
+ * re-creating a directory handle from a dirfd passed over a unix socket.
+ *
+ * The reference to the directory handle must be released using
+ * lttng_directory_handle_put().
+ */
+struct lttng_directory_handle *lttng_directory_handle_create_from_dirfd(
+ int dirfd);
+
+/*
+ * Copy a directory handle.
+ *
+ * The reference to the directory handle must be released using
+ * lttng_directory_handle_put().
+ */
+struct lttng_directory_handle *lttng_directory_handle_copy(
+ const struct lttng_directory_handle *handle);
+
+/*
+ * Acquire a reference to a directory handle.
+ */
+bool lttng_directory_handle_get(struct lttng_directory_handle *handle);
+
+/*
+ * Release a reference to a directory handle.
+ */
+void lttng_directory_handle_put(struct lttng_directory_handle *handle);
+
+/*
+ * Create a subdirectory relative to a directory handle.
+ */
+int lttng_directory_handle_create_subdirectory(
+ const struct lttng_directory_handle *handle,
+ const char *subdirectory,
+ mode_t mode);
+
+/*
+ * Create a subdirectory relative to a directory handle
+ * as a given user.
+ */
+int lttng_directory_handle_create_subdirectory_as_user(
+ const struct lttng_directory_handle *handle,
+ const char *subdirectory,
+ mode_t mode, const struct lttng_credentials *creds);
+
+/*
+ * Recursively create a directory relative to a directory handle.
+ */
+int lttng_directory_handle_create_subdirectory_recursive(
+ const struct lttng_directory_handle *handle,
+ const char *subdirectory_path,
+ mode_t mode);
+
+/*
+ * Recursively create a directory relative to a directory handle
+ * as a given user.
+ */
+int lttng_directory_handle_create_subdirectory_recursive_as_user(
+ const struct lttng_directory_handle *handle,
+ const char *subdirectory_path,
+ mode_t mode, const struct lttng_credentials *creds);
+
+/*
+ * Open a file descriptor to a path relative to a directory handle.
+ */
+int lttng_directory_handle_open_file(
+ const struct lttng_directory_handle *handle,
+ const char *filename,
+ int flags, mode_t mode);
+
+/*
+ * Open a file descriptor to a path relative to a directory handle
+ * as a given user.
+ */
+int lttng_directory_handle_open_file_as_user(
+ const struct lttng_directory_handle *handle,
+ const char *filename,
+ int flags, mode_t mode,
+ const struct lttng_credentials *creds);
+
+/*
+ * Unlink a file to a path relative to a directory handle.
+ */
+int lttng_directory_handle_unlink_file(
+ const struct lttng_directory_handle *handle,
+ const char *filename);
+
+/*
+ * Unlink a file to a path relative to a directory handle as a given user.
+ */
+int lttng_directory_handle_unlink_file_as_user(
+ const struct lttng_directory_handle *handle,
+ const char *filename,
+ const struct lttng_credentials *creds);
+
+/*
+ * Rename a file from a path relative to a directory handle to a new
+ * name relative to another directory handle.
+ */
+int lttng_directory_handle_rename(
+ const struct lttng_directory_handle *old_handle,
+ const char *old_name,
+ const struct lttng_directory_handle *new_handle,
+ const char *new_name);
+
+/*
+ * Rename a file from a path relative to a directory handle to a new
+ * name relative to another directory handle as a given user.
+ */
+int lttng_directory_handle_rename_as_user(
+ const struct lttng_directory_handle *old_handle,
+ const char *old_name,
+ const struct lttng_directory_handle *new_handle,
+ const char *new_name,
+ const struct lttng_credentials *creds);
+
+/*
+ * Remove a subdirectory relative to a directory handle.
+ */
+int lttng_directory_handle_remove_subdirectory(
+ const struct lttng_directory_handle *handle,
+ const char *name);
+
+/*
+ * Remove a subdirectory relative to a directory handle as a given user.
+ */
+int lttng_directory_handle_remove_subdirectory_as_user(
+ const struct lttng_directory_handle *handle,
+ const char *name,
+ const struct lttng_credentials *creds);
+
+/*
+ * Remove a subdirectory and remove its contents if it only
+ * consists in empty directories.
+ * @flags: enum lttng_directory_handle_rmdir_recursive_flags
+ */
+int lttng_directory_handle_remove_subdirectory_recursive(
+ const struct lttng_directory_handle *handle,
+ const char *name, int flags);
+
+/*
+ * Remove a subdirectory and remove its contents if it only
+ * consists in empty directories as a given user.
+ * @flags: enum lttng_directory_handle_rmdir_recursive_flags
+ */
+int lttng_directory_handle_remove_subdirectory_recursive_as_user(
+ const struct lttng_directory_handle *handle,
+ const char *name,
+ const struct lttng_credentials *creds,
+ int flags);
+
+/*
+ * stat() a file relative to a directory handle.
+ */
+int lttng_directory_handle_stat(
+ const struct lttng_directory_handle *handle,
+ const char *name,
+ struct stat *stat_buf);
+
+/*
+ * Returns true if this directory handle is backed by a file
+ * descriptor, false otherwise.
+ */
+bool lttng_directory_handle_uses_fd(
+ const struct lttng_directory_handle *handle);
+
+/*
+ * Compare two directory handles.
+ *
+ * Returns true if the two directory handles are equal, false otherwise.
+ */
+bool lttng_directory_handle_equals(const struct lttng_directory_handle *lhs,
+ const struct lttng_directory_handle *rhs);
+
+
+#endif /* _COMPAT_PATH_HANDLE_H */
projects / lttng-tools.git / blobdiff