fstatvfs

STATVFS(2)		  Linux Programmer’s Manual		   STATVFS(2)



NAME
       statvfs, fstatvfs - get file system statistics

SYNOPSIS
       #include <sys/statvfs.h>

       int statvfs(const char *path, struct statvfs *buf);
       int fstatvfs(int fd, struct statvfs *buf);

DESCRIPTION
       The  function statvfs 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 statvfs structure defined approximately as follows:

	 struct statvfs {
	   unsigned long  f_bsize;    /* file system block size */
	   unsigned long  f_frsize;   /* fragment size */
	   fsblkcnt_t	  f_blocks;   /* size of fs in f_frsize units */
	   fsblkcnt_t	  f_bfree;    /* # free blocks */
	   fsblkcnt_t	  f_bavail;   /* # free blocks for non-root */
	   fsfilcnt_t	  f_files;    /* # inodes */
	   fsfilcnt_t	  f_ffree;    /* # free inodes */
	   fsfilcnt_t	  f_favail;   /* # free inodes for non-root */
	   unsigned long  f_fsid;     /* file system id */
	   unsigned long  f_flag;     /* mount flags */
	   unsigned long  f_namemax;  /* maximum filename length */
	 };

       Here the types fsblkcnt_t and fsfilcnt_t are defined in <sys/types.h>.
       Both used to be unsigned long.

       The field f_flag is a bit mask (of mount flags, see  mount(8)).	 Bits
       defined by POSIX are

       ST_RDONLY
	      Read-only file system.

       ST_NOSUID
	      Setuid/setgid bits are ignored by exec(2).


       It  is  unspecified  whether  all  members of the returned struct have
       meaningful values on all filesystems.

       fstatvfs 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
       EBADF  (fstatvfs) fd is not a valid open file descriptor.

       EACCES (statvfs) Search permission is denied for a  component  of  the
	      path prefix of path.

       ELOOP  (statvfs) Too many symbolic links were encountered in translat-
	      ing path.

       ENAMETOOLONG
	      (statvfs) path is too long.

       ENOENT (statvfs) The file referred to by path does not exist.

       ENOTDIR
	      (statvfs) A component of the path	 prefix	 of  path  is  not  a
	      directory.

       EFAULT Buf or path points to an invalid address.

       EINTR  This call was interrupted by a signal.

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

       ENOMEM Insufficient kernel memory was available.

       ENOSYS The file system does not support this call.

       EOVERFLOW
	      Some  values  were  too large to be represented in the returned
	      struct.


CONFORMING TO
       Solaris, Irix, POSIX 1003.1-2001

NOTES
       The Linux kernel has system calls  statfs,  fstatfs  to	support	 this
       library call.

       The current glibc implementation of

	  pathconf(path, _PC_REC_XFER_ALIGN);
	  pathconf(path, _PC_ALLOC_SIZE_MIN);
	  pathconf(path, _PC_REC_MIN_XFER_SIZE);

       uses the f_frsize, f_frsize, and f_bsize fields of the return value of
       statvfs(path,buf).

SEE ALSO
       statfs(2)



Linux 2.6.0			  2003-08-22			   STATVFS(2)