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 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 ∗/

ustat fails 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. 

­[EINTR] A signal was caught during a ustat system call. 

­[ENOLINK] dev is on a remote machine and the link to that machine is no longer active. 

­[ECOMM] dev is on a remote machine and the link to that machine is no longer active. 

SEE ALSO

stat(2), fs(4). 

DIAGNOSTICS

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

September 29, 2021