NAME

ustat − get file system statistics

SYNOPSIS

#include <sys/types.h>
#include <ustat.h> int ustat (dev, buf)
dev_t dev;
struct ustat ∗buf;

DESCRIPTION

Ustat returns information about a mounted file system.  Dev is a device number identifying a device containing a mounted file system.  Buf is a pointer to a ustat structure (defined in ustat.h) that includes the following elements:

daddr_tf_tfree;/∗ Total free blocks ∗/
ino_tf_tinode;/∗ Number of free inodes ∗/
charf_fname[6];/∗ Filsys name ∗/
charf_fpack[6];/∗ Filsys pack name ∗/
intf_blksize;/∗ Block size ∗/

ERRORS

Ustat will fail if one or more of the following are true:

­[EINVAL] Dev is not the device number of a device containing a mounted file system. 

­[EFAULT] Buf points outside the process’s allocated address space.  The reliable detection of this error will be implementation dependent. 

HARDWARE DEPENDENCIES

Series 200, 300:
f_tfree and f_blksize are reported in fragment size units.

Series 500:
In the above structure,f_fname[6] is the driver name, not the file system name.

RETURN VALUE

Upon successful completion, a value of 0 is returned.  Otherwise, a value of −1 is returned and errno is set to indicate the error. 

AUTHOR

Ustat was developed by AT&T Bell Laboratories and the Hewlett-Packard Company. 

SEE ALSO

touch(1), stat(2), fs(4). 

Hewlett-Packard Company  —  Version B.1,  April 12, 1993