NAME¶

ustat - get filesystem statistics

LIBRARY¶

Standard C library (libc, -lc)

SYNOPSIS¶

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

[[deprecated]] int ustat(dev_t dev, struct ustat *ubuf);

DESCRIPTION¶

ustat() returns information about a mounted filesystem. dev is a device number identifying a device containing a mounted filesystem. 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 to indicate the error.

ERRORS¶

EFAULT

ubuf points outside of your accessible address space.

EINVAL

dev does not refer to a device containing a mounted filesystem.

ENOSYS

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

VERSIONS¶

Since glibc 2.28, glibc no longer provides a wrapper for this system call.

STANDARDS¶

SVr4.

NOTES¶

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

SEE ALSO¶

stat(2), statfs(2)