fstatvfs man page on Archlinux

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

       statvfs, fstatvfs - get filesystem 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 filesystem.
       path is the pathname 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;	  /* filesystem 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;	  /* filesystem 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 filesystem.

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

       It is unspecified whether all members of the returned struct have mean‐
       ingful values on all filesystems.

       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 filesystem.

       ELOOP  (statvfs())  Too	many symbolic links were encountered in trans‐
	      lating 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 filesystem does not support this call.

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

	      Some  values  were  too  large to be represented in the returned

   Multithreading (see pthreads(7))
       The statvfs() and fstatvfs() functions are thread-safe.


       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).


       This page is part of release 3.65 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				  2013-09-26			    STATVFS(3)

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