NAME

ustat − get file system statistics

SYNTAX

#include <sys/types.h>
#include <ustat.h>

int ustat(dev, buf)
int dev;
struct ustat ∗buf;

DESCRIPTION

The ustat system call returns information about a mounted file system.  The specified dev is a device number identifying a device containing a mounted file system.  The specified buf is a pointer to a ustat structure that includes:

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 ∗/

RETURN VALUE

If unsuccessful, returns a −1, and the global variable errno indicates the error code. 

DIAGNOSTICS

The ustat call will fail if:

[EINVAL] The specified dev is not the device number of a device containing a mounted file system. 

[EFAULT] The specified buf points outside the process’s allocated address space. 

SEE ALSO

stat(2), filsys(5)