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

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 pathname 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

       ST_RDONLY
	      Read-only file system.

       ST_NOSUID
	      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.

RETURN VALUE

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

ERRORS

       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.

       ENAMETOOLONG
	      (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.

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

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

CONFORMING TO

       POSIX.1-2001.

NOTES

       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 statvfs(path,buf).

SEE ALSO

       statfs(2)

COLOPHON

       This page is part of release 3.27 of the Linux man-pages project.  A description of the project, and information about reporting bugs,  can
       be found at http://www.kernel.org/doc/man-pages/.

Linux								    2003-08-22								STATVFS(3)