statfs(3) [ultrix man page]

statfs(3)						     Library Functions Manual							 statfs(3)

Name
       statfs, - get file system statistics

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

       statfs(path, buffer)
       char *path;
       struct fs_data *buffer;

Description
       The  library  routine returns up-to-date information about a mounted file system.  The path is the path name of any file within the mounted
       file system.  The buffer is a pointer to an structure as defined in

Return Values
       Upon successful completion, a value of is returned.  If the file system is not mounted, is returned.  Otherwise, is returned and the global
       variable errno is set to indicate the error.

Diagnostics
       The library routine 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]       buffer or path points to an invalid address.

       [EIO]	      An I/O error occurred while reading from the file system.

See Also
       getmnt(2), getmountent(3)

																	 statfs(3)

STATFS(2)							System Calls Manual							 STATFS(2)

NAME

       statfs, fstatfs - get file system statistics

SYNOPSIS

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

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

       int
       fstatfs(fd,buf)
       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:

       #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 */
       short   f_bsize; 	 /* fundamental file system block size */
       short   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 */
       ino_t   f_files; 	 /* total file nodes in file system */
       ino_t   f_ffree; 	 /* free file nodes in fs */
       u_long  f_fsid[2];	 /* file system id */
       long    f_spare[4];	 /* spare for later */
       char    f_mntonname[MNAMELEN];	 /* mount point */
       char    f_mntfromname[MNAMELEN];  /* mounted filesystem */
       };
       /*
       * File system types. - Only UFS is supported so the other types are not
       * given.
       */
       #define	 MOUNT_UFS 1	/* Fast 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 63 characters, or the length of path exceeds 255 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.

4.4 Berkeley Distribution					 December 26, 1995							 STATFS(2)