statvfs, fstatvfs - get filesystem 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 filesystem. 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; /* Filesystem block size */
unsigned long f_frsize; /* Fragment size */
fsblkcnt_t f_blocks; /* Size of fs in f_frsize units */
fsblkcnt_t f_bfree; /* Number of free blocks */
fsblkcnt_t f_bavail; /* Number of free blocks for
unprivileged users */
fsfilcnt_t f_files; /* Number of inodes */
fsfilcnt_t f_ffree; /* Number of free inodes */
fsfilcnt_t f_favail; /* Number of free inodes for
unprivileged users */
unsigned long f_fsid; /* Filesystem 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 indicating various options that were employed when mounting this filesystem. It contains zero or more of the following flags:
Mandatory locking is permitted on the filesystem (see fcntl(2)).
Do not update access times; see mount(2).
Disallow access to device special files on this filesystem.
Do not update directory access times; see mount(2).
Execution of programs is disallowed on this filesystem.
The set-user-ID and set-group-ID bits are ignored by exec(3) for executable files on this filesystem
This filesystem is mounted read-only.
Update atime relative to mtime/ctime; see mount(2).
Writes are synched to the filesystem immediately (see the description of O_SYNC in open(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.
statfs(2)