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STATVFS(3)			    Linux Programmer's Manual			       STATVFS(3)

       statvfs, fstatvfs - get file system statistics

       #include <sys/statvfs.h>

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

       The function statvfs() returns information about a mounted file system.	path is the path-
       name of any file within the mounted file system.  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 unprivileged users */
	       fsfilcnt_t     f_files;	  /* # inodes */
	       fsfilcnt_t     f_ffree;	  /* # free inodes */
	       fsfilcnt_t     f_favail;   /* # free inodes for unprivileged users */
	       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

	      Read-only file system.

	      Set-user-ID/set-group-ID bits are ignored by exec(3).

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

       fstatvfs() returns the same information about an open file referenced by descriptor fd.

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

       EACCES (statvfs()) Search permission is denied for a component of the path prefix of path.
	      (See also path_resolution(7).)

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

       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.

       ELOOP  (statvfs()) Too many symbolic links were encountered in translating path.

	      (statvfs()) path is too long.

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

       ENOMEM Insufficient kernel memory was available.

       ENOSYS The file system does not support this call.

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

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


       The Linux kernel has system calls statfs(2) and fstatfs(2) to support this library call.

       The current glibc implementations of

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

       respectively use the f_frsize, f_frsize,  and  f_bsize  fields  of  the	return	value  of


       This  page  is  part of release 3.53 of the Linux man-pages project.  A description of the
       project,    and	  information	 about	  reporting    bugs,	can    be    found     at

Linux					    2003-08-22				       STATVFS(3)
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