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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-10 20:49:52 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-10 20:49:52 +0000
commit55944e5e40b1be2afc4855d8d2baf4b73d1876b5 (patch)
tree33f869f55a1b149e9b7c2b7e201867ca5dd52992 /src/basic/recurse-dir.h
parentInitial commit. (diff)
downloadsystemd-55944e5e40b1be2afc4855d8d2baf4b73d1876b5.tar.xz
systemd-55944e5e40b1be2afc4855d8d2baf4b73d1876b5.zip
Adding upstream version 255.4.upstream/255.4
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'src/basic/recurse-dir.h')
-rw-r--r--src/basic/recurse-dir.h81
1 files changed, 81 insertions, 0 deletions
diff --git a/src/basic/recurse-dir.h b/src/basic/recurse-dir.h
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+++ b/src/basic/recurse-dir.h
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+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+#pragma once
+
+#include <dirent.h>
+#include <limits.h>
+
+#include "errno-list.h"
+#include "stat-util.h"
+#include "macro.h"
+
+typedef enum RecurseDirEvent {
+ RECURSE_DIR_ENTER, /* only for dir inodes */
+ RECURSE_DIR_LEAVE, /* only for dir inodes */
+ RECURSE_DIR_ENTRY, /* only for non-dir inodes */
+ RECURSE_DIR_SKIP_MOUNT, /* only for dir inodes: when we don't descent into submounts */
+ RECURSE_DIR_SKIP_DEPTH, /* only for dir inodes: when we reached the max depth */
+
+ /* If we hit an error opening/stating an entry, then we'll fire a
+ * 'RECURSE_DIR_SKIP_{OPEN_DIR|OPEN_INODE|STAT_INODE}_ERROR_BASE + errno' event. In this case 'de'
+ * will be valid, but the statx data NULL and the inode fd -1. */
+ RECURSE_DIR_SKIP_OPEN_DIR_ERROR_BASE,
+ RECURSE_DIR_SKIP_OPEN_DIR_ERROR_MAX = RECURSE_DIR_SKIP_OPEN_DIR_ERROR_BASE + ERRNO_MAX,
+
+ RECURSE_DIR_SKIP_OPEN_INODE_ERROR_BASE,
+ RECURSE_DIR_SKIP_OPEN_INODE_ERROR_MAX = RECURSE_DIR_SKIP_OPEN_INODE_ERROR_BASE + ERRNO_MAX,
+
+ RECURSE_DIR_SKIP_STAT_INODE_ERROR_BASE,
+ RECURSE_DIR_SKIP_STAT_INODE_ERROR_MAX = RECURSE_DIR_SKIP_STAT_INODE_ERROR_BASE + ERRNO_MAX,
+
+ _RECURSE_DIR_EVENT_MAX,
+ _RECURSE_DIR_EVENT_INVALID = -EINVAL,
+} RecurseDirEvent;
+
+#define RECURSE_DIR_CONTINUE 0
+#define RECURSE_DIR_LEAVE_DIRECTORY INT_MIN
+#define RECURSE_DIR_SKIP_ENTRY (INT_MIN+1)
+
+/* Make sure that the negative errno range and these two special returns don't overlap */
+assert_cc(RECURSE_DIR_LEAVE_DIRECTORY < -ERRNO_MAX);
+assert_cc(RECURSE_DIR_SKIP_ENTRY < -ERRNO_MAX);
+
+/* Prototype for the callback function that is called whenever we enter or leave a dir inode, or find another dir entry. Return values are:
+ *
+ * RECURSE_DIR_CONTINUE (i.e. 0) → continue with next entry
+ * RECURSE_DIR_LEAVE_DIRECTORY → leave current directory immediately, don't process further siblings
+ * RECURSE_DIR_SKIP_ENTRY → skip this entry otherwise (only makes sense on RECURSE_DIR_ENTER)
+ * others → terminate iteration entirely, return the specified value (idea is that
+ * < 0 indicates errors and > 0 indicates various forms of success)
+ */
+typedef int (*recurse_dir_func_t)(
+ RecurseDirEvent event,
+ const char *path, /* Full non-normalized path, i.e. the path specified during recurise_dir() with what we found appended */
+ int dir_fd, /* fd of the current dir */
+ int inode_fd, /* fd of the current entry in the current dir (O_DIRECTORY if directory, and O_PATH otherwise, but only if RECURSE_DIR_INODE_FD was set) */
+ const struct dirent *de, /* directory entry (always valid) */
+ const struct statx *sx, /* statx data (only if statx_mask was non-zero) */
+ void *userdata);
+
+typedef enum RecurseDirFlags {
+ /* Interpreted by readdir_all() */
+ RECURSE_DIR_SORT = 1 << 0, /* sort file directory entries before processing them */
+ RECURSE_DIR_IGNORE_DOT = 1 << 1, /* ignore all dot files ("." and ".." are always ignored) */
+ RECURSE_DIR_ENSURE_TYPE = 1 << 2, /* guarantees that 'd_type' field of 'de' is not DT_UNKNOWN */
+
+ /* Interpreted by recurse_dir() */
+ RECURSE_DIR_SAME_MOUNT = 1 << 3, /* skips over subdirectories that are submounts */
+ RECURSE_DIR_INODE_FD = 1 << 4, /* passes an opened inode fd (O_DIRECTORY fd in case of dirs, O_PATH otherwise) */
+ RECURSE_DIR_TOPLEVEL = 1 << 5, /* call RECURSE_DIR_ENTER/RECURSE_DIR_LEAVE once for top-level dir, too, with dir_fd=-1 and NULL dirent */
+} RecurseDirFlags;
+
+typedef struct DirectoryEntries {
+ size_t n_entries;
+ struct dirent** entries;
+ size_t buffer_size;
+ struct dirent buffer[];
+} DirectoryEntries;
+
+int readdir_all(int dir_fd, RecurseDirFlags flags, DirectoryEntries **ret);
+
+int recurse_dir(int dir_fd, const char *path, unsigned statx_mask, unsigned n_depth_max, RecurseDirFlags flags, recurse_dir_func_t func, void *userdata);
+int recurse_dir_at(int atfd, const char *path, unsigned statx_mask, unsigned n_depth_max, RecurseDirFlags flags, recurse_dir_func_t func, void *userdata);