STATFS(2) MachTen Programmer’s 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 filesystem. Buf is a pointer to
a statfs() structure defined as follows:

typedef quad fsid_t;

#define MNAMELEN 90 /* length of buffer for returned name */

struct statfs {
short f_type; /* type of filesystem (see below) */
short f_flags; /* copy of mount flags */
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 */
long f_spare[9]; /* spare for later */
char f_mntonname[MNAMELEN]; /* mount point */
char f_mntfromname[MNAMELEN]; /* mounted filesystem */
};
/*
* File system types.
*/
#define MOUNT_UFS 1 /* Fast Filesystem */
#define MOUNT_NFS 2 /* Sun-compatible Network Filesystem */
#define MOUNT_MFS 3 /* Memory-based Filesystem */
#define MOUNT_MSDOS 4 /* MS/DOS Filesystem */
#define MOUNT_LFS 5 /* Log-based Filesystem */
#define MOUNT_LOFS 6 /* Loopback Filesystem */
#define MOUNT_FDESC 7 /* File Descriptor Filesystem */
#define MOUNT_PORTAL 8 /* Portal Filesystem */
#define MOUNT_NULL 9 /* Minimal Filesystem Layer */
#define MOUNT_UMAP 10 /* Uid/Gid Remapping Filesystem */
#define MOUNT_KERNFS 11 /* Kernel Information Filesystem */
#define MOUNT_PROCFS 12 /* /proc Filesystem */
#define MOUNT_AFS 13 /* Andrew Filesystem */
#define MOUNT_CD9660 14 /* ISO9660 (aka CDROM) Filesystem */
#define MOUNT_UNION 15 /* Union (translucent) Filesystem */

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 directory.

[EINVAL] path contains a character with the high-order bit set.

[ENAMETOOLONG]
The length of a component of path exceeds 255 characters,
or the length of path exceeds 1023 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 translating
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.

4.4BSD February 11, 1994 2