statvfs, fstatvfs — get file system statistics
#include <sys/statvfs.h>
int
statvfs( |
const char * | path, |
| struct statvfs * | buf); |
int
fstatvfs( |
int | fd, |
| struct statvfs * | buf); |
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 */ | ||
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
ST_RDONLYRead-only file system.
ST_NOSUIDSet-user-ID/set-group-ID bits are ignored by exec(2).
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.
On success, zero is returned. On error, −1 is
returned, and errno is set
appropriately.
(statvfs()) Search
permission is denied for a component of the path prefix
of path. (See
also path_resolution(2).)
(fstatvfs())
fd is not a
valid open file descriptor.
Buf or
path points to
an invalid address.
This call was interrupted by a signal.
An I/O error occurred while reading from the file system.
(statvfs()) Too many
symbolic links were encountered in translating
path.
(statvfs()) path is too long.
(statvfs()) The file
referred to by path does not exist.
Insufficient kernel memory was available.
The file system does not support this call.
(statvfs()) A
component of the path prefix of path is not a
directory.
Some values were too large to be represented in the returned struct.
The Linux kernel has system calls statfs(2) and fstatfs(2) to support this library call.
The current glibc implementations of
pathconf(path, _PC_REC_XFER_ALIGN); pathconf(path, _PC_ALLOC_SIZE_MIN); pathconf(path, _PC_REC_MIN_XFER_SIZE);
respectively use the f_frsize, f_frsize, and f_bsize fields of the return
value of statvfs(path,buf).
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