statfs man page on 4.4BSD

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STATFS(2)		    BSD System Calls Manual		     STATFS(2)

     statfs — get file system statistics

     #include <sys/param.h>
     #include <sys/mount.h>

     statfs(const char *path, struct statfs *buf);

     fstatfs(int fd, struct statfs *buf);

     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 MFSNAMELEN	     16	     /* length of fs type name, including null */
     #define MNAMELEN	     90	     /* length of buffer for returned name */

     struct statfs {
	     short   f_type;		     /* filesystem type number */
	     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 */
	     uid_t   f_owner;		     /* user that mounted the filesystem */
	     long    f_spare[4];	     /* spare for later */
	     char    f_fstypename[MFSNAMELEN]; /* fs type name */
	     char    f_mntonname[MNAMELEN];  /* directory on which mounted */
	     char    f_mntfromname[MNAMELEN];/* mounted filesystem */
     The flags that may be returned include:

     MNT_RDONLY	       The filesystem is mounted read-only; Even the super-
		       user may not write on it.

     MNT_NOEXEC	       Files may not be executed from the filesystem.

     MNT_NOSUID	       Setuid and setgid bits on files are not honored when
		       they are executed.

     MNT_NODEV	       Special files in the filesystem may not be opened.

     MNT_SYNCHRONOUS   All I/O to the filesystem is done synchronously.

     MNT_ASYNCHRONOUS  No filesystem I/O is done synchronously.

     MNT_LOCAL	       The filesystem resides locally.

     MNT_QUOTA	       The filesystem has quotas enabled on it.

     MNT_ROOTFS	       Identifies the root filesystem.

     MNT_EXRDONLY      The filesystem is exported read-only.

     MNT_EXPORTED      The filesystem is exported for both reading and writ‐

     MNT_DEFEXPORTED   The filesystem is exported for both reading and writing
		       to any Internet host.

     MNT_EXPORTANON    The filesystem maps all remote accesses to the anony‐
		       mous user.

     MNT_EXKERB	       The filesystem is exported with Kerberos uid mapping.

     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.

     Upon successful completion, a value of 0 is returned.  Otherwise, -1 is
     returned and the global variable errno is set to indicate the error.

     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.

		    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

     [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]	    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.

     The statfs function first appeared in 4.4BSD.

BSD				 May 24, 1995				   BSD

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