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// Copyright © Tavian Barnes <tavianator@tavianator.com>
// SPDX-License-Identifier: 0BSD
/**
* Directories and their contents.
*/
#ifndef BFS_DIR_H
#define BFS_DIR_H
#include "prelude.h"
#include <sys/types.h>
/**
* Whether the implementation uses the getdents() syscall directly, rather than
* libc's readdir().
*/
#if !defined(BFS_USE_GETDENTS) && (__linux__ || __FreeBSD__)
# define BFS_USE_GETDENTS (BFS_HAS_GETDENTS || BFS_HAS_GETDENTS64 | BFS_HAS_GETDENTS64_SYSCALL)
#endif
/**
* A directory.
*/
struct bfs_dir;
/**
* File types.
*/
enum bfs_type {
/** An error occurred for this file. */
BFS_ERROR = -1,
/** Unknown type. */
BFS_UNKNOWN,
/** Block device. */
BFS_BLK,
/** Character device. */
BFS_CHR,
/** Directory. */
BFS_DIR,
/** Solaris door. */
BFS_DOOR,
/** Pipe. */
BFS_FIFO,
/** Symbolic link. */
BFS_LNK,
/** Solaris event port. */
BFS_PORT,
/** Regular file. */
BFS_REG,
/** Socket. */
BFS_SOCK,
/** BSD whiteout. */
BFS_WHT,
};
/**
* Convert a bfs_stat() mode to a bfs_type.
*/
enum bfs_type bfs_mode_to_type(mode_t mode);
/**
* A directory entry.
*/
struct bfs_dirent {
/** The type of this file (possibly unknown). */
enum bfs_type type;
/** The name of this file. */
const char *name;
};
/**
* Allocate space for a directory.
*
* @return
* An allocated, unopen directory, or NULL on failure.
*/
struct bfs_dir *bfs_allocdir(void);
struct arena;
/**
* Initialize an arena for directories.
*
* @param arena
* The arena to initialize.
*/
void bfs_dir_arena(struct arena *arena);
/**
* bfs_opendir() flags.
*/
enum bfs_dir_flags {
/** Include whiteouts in the results. */
BFS_DIR_WHITEOUTS = 1 << 0,
/** @internal Start of private flags. */
BFS_DIR_PRIVATE = 1 << 1,
};
/**
* Open a directory.
*
* @param dir
* The allocated directory.
* @param at_fd
* The base directory for path resolution.
* @param at_path
* The path of the directory to open, relative to at_fd. Pass NULL to
* open at_fd itself.
* @param flags
* Flags that control which directory entries are listed.
* @return
* 0 on success, or -1 on failure.
*/
int bfs_opendir(struct bfs_dir *dir, int at_fd, const char *at_path, enum bfs_dir_flags flags);
/**
* Get the file descriptor for a directory.
*/
int bfs_dirfd(const struct bfs_dir *dir);
/**
* Performs any I/O necessary for the next bfs_readdir() call.
*
* @param dir
* The directory to poll.
* @return
* 1 on success, 0 on EOF, or -1 on failure.
*/
int bfs_polldir(struct bfs_dir *dir);
/**
* Read a directory entry.
*
* @param dir
* The directory to read.
* @param[out] dirent
* The directory entry to populate.
* @return
* 1 on success, 0 on EOF, or -1 on failure.
*/
int bfs_readdir(struct bfs_dir *dir, struct bfs_dirent *de);
/**
* Close a directory.
*
* @return
* 0 on success, -1 on failure.
*/
int bfs_closedir(struct bfs_dir *dir);
/**
* Whether the bfs_unwrapdir() function is supported.
*/
#ifndef BFS_USE_UNWRAPDIR
# define BFS_USE_UNWRAPDIR (BFS_USE_GETDENTS || BFS_HAS_FDCLOSEDIR)
#endif
#if BFS_USE_UNWRAPDIR
/**
* Detach the file descriptor from an open directory.
*
* @param dir
* The directory to detach.
* @return
* The file descriptor of the directory.
*/
int bfs_unwrapdir(struct bfs_dir *dir);
#endif
#endif // BFS_DIR_H
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