apr_file_info.h

linux subdivision ying gai ke yi le ba

/* Copyright 2000-2005 The Apache Software Foundation or its licensors, as
 * applicable.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#ifndef APR_FILE_INFO_H
#define APR_FILE_INFO_H

/**
 * @file apr_file_info.h
 * @brief APR File Information
 */

#include "apr.h"
#include "apr_user.h"
#include "apr_pools.h"
#include "apr_tables.h"
#include "apr_time.h"
#include "apr_errno.h"

#if APR_HAVE_SYS_UIO_H
#include <sys/uio.h>
#endif

#ifdef __cplusplus
extern "C" {
#endif /* __cplusplus */

/**
 * @defgroup apr_file_info File Information
 * @ingroup APR 
 * @{
 */

/* Many applications use the type member to determine the
 * existance of a file or initialization of the file info,
 * so the APR_NOFILE value must be distinct from APR_UNKFILE.
 */

/** apr_filetype_e values for the filetype member of the 
 * apr_file_info_t structure
 * @warning: Not all of the filetypes below can be determined.
 * For example, a given platform might not correctly report 
 * a socket descriptor as APR_SOCK if that type isn't 
 * well-identified on that platform.  In such cases where
 * a filetype exists but cannot be described by the recognized
 * flags below, the filetype will be APR_UNKFILE.  If the
 * filetype member is not determined, the type will be APR_NOFILE.
 */

typedef enum {
    APR_NOFILE = 0,     /**< no file type determined */
    APR_REG,            /**< a regular file */
    APR_DIR,            /**< a directory */
    APR_CHR,            /**< a character device */
    APR_BLK,            /**< a block device */
    APR_PIPE,           /**< a FIFO / pipe */
    APR_LNK,            /**< a symbolic link */
    APR_SOCK,           /**< a [unix domain] socket */
    APR_UNKFILE = 127   /**< a file of some other unknown type */
} apr_filetype_e; 

/**
 * @defgroup apr_file_permissions File Permissions flags 
 * @{
 */

#define APR_USETID      0x8000 /**< Set user id */
#define APR_UREAD       0x0400 /**< Read by user */
#define APR_UWRITE      0x0200 /**< Write by user */
#define APR_UEXECUTE    0x0100 /**< Execute by user */

#define APR_GSETID      0x4000 /**< Set group id */
#define APR_GREAD       0x0040 /**< Read by group */
#define APR_GWRITE      0x0020 /**< Write by group */
#define APR_GEXECUTE    0x0010 /**< Execute by group */

#define APR_WSTICKY     0x2000 /**< Sticky bit */
#define APR_WREAD       0x0004 /**< Read by others */
#define APR_WWRITE      0x0002 /**< Write by others */
#define APR_WEXECUTE    0x0001 /**< Execute by others */

#define APR_OS_DEFAULT  0x0FFF /**< use OS's default permissions */

/* additional permission flags for apr_file_copy  and apr_file_append */
#define APR_FILE_SOURCE_PERMS 0x1000 /**< Copy source file's permissions */

/** @} */


/**
 * Structure for referencing directories.
 */
typedef struct apr_dir_t          apr_dir_t;
/**
 * Structure for determining file permissions.
 */
typedef apr_int32_t               apr_fileperms_t;
#if (defined WIN32) || (defined NETWARE)
/**
 * Structure for determining the inode of the file.
 */
typedef apr_uint64_t              apr_ino_t;
/**
 * Structure for determining the device the file is on.
 */
typedef apr_uint32_t              apr_dev_t;
#else
/** The inode of the file. */
typedef ino_t                     apr_ino_t;
/**
 * Structure for determining the device the file is on.
 */
typedef dev_t                     apr_dev_t;
#endif

/**
 * @defgroup apr_file_stat Stat Functions
 * @{
 */
/** file info structure */
typedef struct apr_finfo_t        apr_finfo_t;

#define APR_FINFO_LINK   0x00000001 /**< Stat the link not the file itself if it is a link */
#define APR_FINFO_MTIME  0x00000010 /**< Modification Time */
#define APR_FINFO_CTIME  0x00000020 /**< Creation Time */
#define APR_FINFO_ATIME  0x00000040 /**< Access Time */
#define APR_FINFO_SIZE   0x00000100 /**< Size of the file */
#define APR_FINFO_CSIZE  0x00000200 /**< Storage size consumed by the file */
#define APR_FINFO_DEV    0x00001000 /**< Device */
#define APR_FINFO_INODE  0x00002000 /**< Inode */
#define APR_FINFO_NLINK  0x00004000 /**< Number of links */
#define APR_FINFO_TYPE   0x00008000 /**< Type */
#define APR_FINFO_USER   0x00010000 /**< User */
#define APR_FINFO_GROUP  0x00020000 /**< Group */
#define APR_FINFO_UPROT  0x00100000 /**< User protection bits */
#define APR_FINFO_GPROT  0x00200000 /**< Group protection bits */
#define APR_FINFO_WPROT  0x00400000 /**< World protection bits */
#define APR_FINFO_ICASE  0x01000000 /**< if dev is case insensitive */
#define APR_FINFO_NAME   0x02000000 /**< ->name in proper case */

#define APR_FINFO_MIN    0x00008170 /**< type, mtime, ctime, atime, size */
#define APR_FINFO_IDENT  0x00003000 /**< dev and inode */
#define APR_FINFO_OWNER  0x00030000 /**< user and group */
#define APR_FINFO_PROT   0x00700000 /**<  all protections */
#define APR_FINFO_NORM   0x0073b170 /**<  an atomic unix apr_stat() */
#define APR_FINFO_DIRENT 0x02000000 /**<  an atomic unix apr_dir_read() */

/**
 * The file information structure.  This is analogous to the POSIX
 * stat structure.
 */
struct apr_finfo_t {
    /** Allocates memory and closes lingering handles in the specified pool */
    apr_pool_t *pool;
    /** The bitmask describing valid fields of this apr_finfo_t structure 
     *  including all available 'wanted' fields and potentially more */
    apr_int32_t valid;
    /** The access permissions of the file.  Mimics Unix access rights. */
    apr_fileperms_t protection;
    /** The type of file.  One of APR_REG, APR_DIR, APR_CHR, APR_BLK, APR_PIPE, 
     * APR_LNK or APR_SOCK.  If the type is undetermined, the value is APR_NOFILE.
     * If the type cannot be determined, the value is APR_UNKFILE.
     */
    apr_filetype_e filetype;
    /** The user id that owns the file */
    apr_uid_t user;
    /** The group id that owns the file */
    apr_gid_t group;
    /** The inode of the file. */
    apr_ino_t inode;
    /** The id of the device the file is on. */
    apr_dev_t device;
    /** The number of hard links to the file. */
    apr_int32_t nlink;
    /** The size of the file */
    apr_off_t size;
    /** The storage size consumed by the file */
    apr_off_t csize;
    /** The time the file was last accessed */
    apr_time_t atime;
    /** The time the file was last modified */
    apr_time_t mtime;
    /** The time the file was last changed */
    apr_time_t ctime;
    /** The pathname of the file (possibly unrooted) */
    const char *fname;
    /** The file's name (no path) in filesystem case */
    const char *name;
    /** The file's handle, if accessed (can be submitted to apr_duphandle) */
    struct apr_file_t *filehand;
};

/**
 * get the specified file's stats.  The file is specified by filename, 
 * instead of using a pre-opened file.
 * @param finfo Where to store the information about the file, which is
 * never touched if the call fails.