NAME
ustat - get file system statistics
SYNOPSIS
#include <sys/types.h>
#include <unistd.h> /* libc[45] */
#include <ustat.h> /* glibc2 */
int ustat(dev_t dev, struct ustat *ubuf);
DESCRIPTION
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
members:
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').
RETURN VALUE
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
appropriately.
ERRORS
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.
CONFORMING TO
SVr4.
NOTES
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
systems, 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.
SEE ALSO
stat(2), statfs(2)
COLOPHON
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