STATFS (2)

SYNOPSIS

#include <sys/vfs.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:

struct statfs {
   long    f_type;     /* type of filesystem (see below) */
   long    f_bsize;    /* 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_namelen;  /* maximum length of filenames */
   long    f_spare[6]; /* spare for later */
};

File system types:

linux/affs_fs.h:
   AFFS_SUPER_MAGIC      0xADFF
linux/ext_fs.h:
   EXT_SUPER_MAGIC       0x137D
linux/ext2_fs.h:
   EXT2_OLD_SUPER_MAGIC  0xEF51
   EXT2_SUPER_MAGIC      0xEF53
linux/hpfs_fs.h:
   HPFS_SUPER_MAGIC      0xF995E849
linux/iso_fs.h:
   ISOFS_SUPER_MAGIC     0x9660
linux/minix_fs.h:
   MINIX_SUPER_MAGIC     0x137F /* orig. minix */
   MINIX_SUPER_MAGIC2    0x138F /* 30 char minix */
   MINIX2_SUPER_MAGIC    0x2468 /* minix V2 */
   MINIX2_SUPER_MAGIC2   0x2478 /* minix V2, 30 char names */
linux/msdos_fs.h:
   MSDOS_SUPER_MAGIC     0x4d44
linux/ncp_fs.h:
   NCP_SUPER_MAGIC       0x564c
linux/nfs_fs.h:
   NFS_SUPER_MAGIC       0x6969
linux/proc_fs.h:
   PROC_SUPER_MAGIC      0x9fa0
linux/smb_fs.h:
   SMB_SUPER_MAGIC       0x517B
linux/sysv_fs.h:
   XENIX_SUPER_MAGIC     0x012FF7B4
   SYSV4_SUPER_MAGIC     0x012FF7B5
   SYSV2_SUPER_MAGIC     0x012FF7B6
   COH_SUPER_MAGIC       0x012FF7B7
linux/ufs_fs.h:
   UFS_MAGIC             0x00011954
linux/xia_fs.h:
   _XIAFS_SUPER_MAGIC    0x012FD16D

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 VALUE

On success, zero is returned. On error, -1 is returned, and errno is set appropriately.

ERRORS

For statfs :

ENOTDIR

A component of the path prefix of path is not a directory.

ENAMETOOLONG

path is too long.

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.

ENOMEM

Insufficient kernel memory was available.

ENOSYS

The filesystem path is on does not support statfs .

For fstatfs :

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.

ENOSYS

The filesystem fd is open on does not support statfs .

CONFORMING TO

4.4BSD.

SEE ALSO

- stat (2) -