statvfs() - Unix, Linux System Call
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NAME
statvfs, fstatvfs - get file system statistics
SYNOPSIS
#include <sys/statvfs.h>
int statvfs(const char *path, struct statvfs *buf);
int fstatvfs(int fd, struct statvfs *buf);
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DESCRIPTION
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
statvfs structure 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 */
};
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Here the types
fsblkcnt_t and
fsfilcnt_t are defined in
<sys/types.h>. Both used to be
unsigned long.
The field
f_flag is a bit mask (of mount flags, see
mount(8)).
Bits defined by POSIX are
| Tag | Description |
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ST_RDONLY |
Read-only file system.
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ST_NOSUID |
Set-user-ID/set-group-ID bits are ignored by
exec(2).
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It is unspecified whether all members of the returned struct have meaningful values on all filesystems.
fstatvfs() returns the same information about an open file referenced by descriptor
fd.
RETURN VALUE
On success, zero is returned. On error, -1 is returned, and
errno is set appropriately.
ERRORS
| Error Code | Description |
|---|
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EACCES |
(statvfs()) Search permission is denied for a component of the path prefix of
path. (See also
path_resolution(2).)
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EBADF |
(fstatvfs()) fd is not a valid open file descriptor.
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EFAULT |
Buf or
path points to an invalid address.
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EINTR |
This call was interrupted by a signal.
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EIO |
An I/O error occurred while reading from the file system.
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ELOOP |
(statvfs()) Too many symbolic links were encountered in translating
path. |
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ENAMETOOLONG |
(statvfs()) path is too long.
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ENOENT |
(statvfs()) The file referred to by
path does not exist.
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ENOMEM |
Insufficient kernel memory was available.
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ENOSYS |
The file system does not support this call.
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ENOTDIR |
(statvfs()) A component of the path prefix of
path is not a directory.
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EOVERFLOW |
Some values were too large to be represented in the returned struct.
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CONFORMING TO
Solaris, Irix, POSIX.1-2001
NOTES
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);
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uses the
f_frsize, f_frsize, and
f_bsize fields of the return value of
statvfs(path,buf).
SEE ALSO
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