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USTAT(2)		   Linux Programmer's Manual		      USTAT(2)

       ustat - get file system statistics

       #include <sys/types.h>
       #include <unistd.h>    /* libc[45] */
       #include <ustat.h>     /* glibc2 */

       int ustat(dev_t dev, struct ustat *ubuf);

       ustat()	returns	 information  about  a	mounted file system.  dev is a
       device number identifying a device containing a	mounted	 file  system.
       ubuf is a pointer to a ustat structure that contains the following mem‐

	   daddr_t f_tfree;	 /* Total free blocks */
	   ino_t   f_tinode;	 /* Number of free inodes */
	   char	   f_fname[6];	 /* Filsys name */
	   char	   f_fpack[6];	 /* Filsys pack name */

       The last two fields, f_fname and f_fpack, are not implemented and  will
       always be filled with null bytes ('\0').

       On success, zero is returned and the ustat structure pointed to by ubuf
       will be filled in.  On error, -1 is returned, and errno is  set	appro‐

       EFAULT ubuf points outside of your accessible address space.

       EINVAL dev does not refer to a device containing a mounted file system.

       ENOSYS The  mounted file system referenced by dev does not support this
	      operation, or any version of Linux before 1.3.16.


       ustat() is deprecated and has only  been	 provided  for	compatibility.
       All new programs should use statfs(2) instead.

   HP-UX Notes
       The  HP-UX  version  of	the  ustat  structure has an additional field,
       f_blksize, that is unknown elsewhere.  HP-UX warns: For some file  sys‐
       tems,  the  number  of  free inodes does not change.  Such file systems
       will return -1 in the field f_tinode.  For some	file  systems,	inodes
       are  dynamically	 allocated.  Such file systems will return the current
       number of free inodes.

       stat(2), statfs(2)

       This page is part of release 3.22 of the Linux  man-pages  project.   A
       description  of	the project, and information about reporting bugs, can
       be found at

Linux				  2003-08-04			      USTAT(2)

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