statvfs, fstatvfs - 獲取文件系統統計信息

內容簡介

#include <sys/statvfs.h>**int statvfs(const char *path, struct statvfs *buf);** int fstatvfs(int fd**, struct statvfs *buf);**

描述

The function statvfs() returns information about a mounted file system. path is the pathname of any file within the mounted filesystem. buf is a pointer to a statvfsstructure defined approximately as follows:

struct statvfs {
unsigned long f_bsize; /* file system block size */
unsigned long f_frsize; /* fragment size */
fsblkcnt_t f_blocks; /* size of fs in f_frsize units */
fsblkcnt_t f_bfree; /* # free blocks */
fsblkcnt_t f_bavail; /* # free blocks for non-root */
fsfilcnt_t f_files; /* # inodes */
fsfilcnt_t f_ffree; /* # free inodes */
fsfilcnt_t f_favail; /* # free inodes for non-root */
unsigned long f_fsid; /* file system ID */
unsigned long f_flag; /* mount flags */
unsigned long f_namemax; /* maximum filename length */
};

Here the types fsblkcnt_t and fsfilcnt_t are defined in <sys/types.h>. Both used to beunsigned long.

The field f_flag is a bit mask (of mount flags, see mount(8)). Bits defined by POSIX are

標籤

描述

ST_RDONLY

Read-only file system.

ST_NOSUID

Set-user-ID/set-group-ID bits are ignored by exec(2).

它是不確定的返回結構的所有成員是否對所有文件系統有意義的值。

fstatvfs() 返回有關由描述符fd指定打開的文件相同的信息。

返回值

On success, zero is returned. On error, -1 is returned, and errno is set appropriately.

錯誤

Error Code

描述

EACCES

(statvfs()) Search permission is denied for a component of the path prefix of path. (See also path_resolution(2).)

EBADF

(fstatvfs()) fd is not a valid open file descriptor.

EFAULT

Buf or path points to an invalid address.

EINTR

This call was interrupted by a signal.

EIO

An I/O error occurred while reading from the file system.

ELOOP

(statvfs()) Too many symbolic links were encountered in translating path.

ENAMETOOLONG

(statvfs()) path is too long.

ENOENT

(statvfs()) The file referred to by path does not exist.

ENOMEM

Insufficient kernel memory was available.

ENOSYS

The file system does not support this call.

ENOTDIR

(statvfs()) A component of the path prefix of path is not a directory.

EOVERFLOW

Some values were too large to be represented in the returned struct.

遵循於

Solaris, Irix, POSIX.1-2001

注意

The Linux kernel has system calls statfs() and fstatfs() to support this library call.

The current glibc implementation of

pathconf(path, _PC_REC_XFER_ALIGN);
pathconf(path, _PC_ALLOC_SIZE_MIN);
pathconf(path, _PC_REC_MIN_XFER_SIZE);

uses the f_frsize, f_frsize, and f_bsize fields of the return value of statvfs(path,buf).

另請參閱

• statfs (2)