STATFS(2) BSD System Calls Manual STATFS(2)
NAME
statfs -- get file system statistics
SYNOPSIS
#include <sys/param.h>
#include <sys/mount.h>
int
statfs(const char *path, struct statfs *buf);
int
fstatfs(int fd, struct statfs *buf);
DESCRIPTION
Statfs() returns information about a mounted file system. Path is the
path name of any file within the mounted file system. Buf is a pointer
to a statfs structure defined as follows:
typedef struct { int32_t val[2]; } fsid_t;
#define MFSNAMELEN 15 /* length of fs type name, not inc. nul */
#define MNAMELEN 90 /* length of buffer for returned name */
struct statfs {
short f_otype; /* type of file system (reserved: zero) */
short f_oflags; /* copy of mount flags (reserved: zero) */
long f_bsize; /* fundamental file system block size */
long f_iosize; /* optimal transfer block size */
long f_blocks; /* total data blocks in file system */
long f_bfree; /* free blocks in fs */
long f_bavail; /* free blocks avail to non-superuser */
long f_files; /* total file nodes in file system */
long f_ffree; /* free file nodes in fs */
fsid_t f_fsid; /* file system id (super-user only) */
uid_t f_owner; /* user that mounted the file system */
short f_reserved1; /* reserved for future use */
short f_type; /* type of file system (reserved) */
long f_flags; /* copy of mount flags (reserved) */
long f_reserved2[2]; /* reserved for future use */
char f_fstypename[MFSNAMELEN]; /* fs type name */
char f_mntonname[MNAMELEN]; /* directory on which mounted */
char f_mntfromname[MNAMELEN]; /* mounted file system */
char f_reserved3; /* reserved for future use */
long f_reserved4[4]; /* reserved for future use */
};
Fields that are undefined for a particular file system are set to -1.
Fstatfs() returns the same information about an open file referenced by
descriptor fd.
RETURN VALUES
Upon successful completion, a value of 0 is returned. Otherwise, -1 is
returned and the global variable errno is set to indicate the error.
ERRORS
Statfs() fails if one or more of the following are true:
[ENOTDIR] A component of the path prefix of Path is not a direc-
tory.
[ENAMETOOLONG] The length of a component of path exceeds {NAME_MAX}
characters, or the length of path exceeds {PATH_MAX}
characters.
[ENOENT] The file referred to by path does not exist.
[EACCES] Search permission is denied for a component of the
path prefix of path.
[ELOOP] Too many symbolic links were encountered in translat-
ing path.
[EFAULT] Buf or path points to an invalid address.
[EIO] An I/O error occurred while reading from or writing to
the file system.
Fstatfs() fails if one or more of the following are true:
[EBADF] fd is not a valid open file descriptor.
[EFAULT] Buf points to an invalid address.
[EIO] An I/O error occurred while reading from or writing to
the file system.
HISTORY
The statfs() function first appeared in 4.4BSD.
BSD February 11, 1994 BSD