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ustat(2)                         System Calls                         ustat(2)



NAME
       ustat - get file system statistics

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

       int ustat(dev_t dev, struct ustat *buf);

DESCRIPTION
       The  ustat()  function returns information about a mounted file system.
       The dev argument is a device number identifying a device  containing  a
       mounted file system (see makedev(3C)). The buf argument is a pointer to
       a ustat structure that includes 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 f_fname and f_fpack members may not contain significant information
       on all systems; in this case, these members will contain the null char-
       acter as the first character.

RETURN VALUES
       Upon successful completion, 0 is returned. Otherwise,  -1  is  returned
       and errno is set to indicate the error.

ERRORS
       The ustat() function will fail if:

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                       that machine is no longer active.



       EFAULT          The buf argument points to an illegal address.



       EINTR           A signal was caught during the execution of the ustat()
                       function.



       EINVAL          The  dev  argument is not the device number of a device
                       containing a mounted file system.



       ENOLINK         The dev argument refers to a device on a remote machine
                       and the link  to that machine is no longer active.



       EOVERFLOW       One of the values returned cannot be represented in the
                       structure pointed to by buf.



USAGE
       The statvfs(2) function should be used in favor of ustat().

SEE ALSO
       stat(2), statvfs(2), makedev(3C), lfcompile(5)

BUGS
       The NFS revision 2 protocol does not permit the number of free files to
       be  provided to the client; therefore, when ustat() has completed on an
       NFS file system, f_tinode is always -1.



SunOS 5.10                        23 Jul 2001                         ustat(2)