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USTAT (2) | System calls | Unix Manual Pages | :man▋

NAME

ustat - get file system statistics

CONTENTS

Synopsis
Description
Errors
Notes

SYNOPSIS



#include <sys/types.h>




"#include <unistd.h>"" /* libc[45] */"




"#include <ustat.h>""/* glibc2 */"



"int ustat(dev_t "dev", struct ustat *"ubuf);

DESCRIPTION

ustat returns information about a mounted file system. dev is a device number identifying a device containing a mounted file system. 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 characters.

"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 appropriately.

ERRORS

EINVAL dev does not refer to a device containing a mounted file system.
EFAULT ubuf points outside of your accessible address space.
ENOSYS The mounted file system referenced by dev does not support this operation, or any version of Linux before 1.3.16.

"CONFORMING TO"

SVr4. SVr4 documents additional error conditions ENOLINK, ECOMM, and EINTR but has no ENOSYS condition.

NOTES

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

"HP NOTES"

The HP version of struct ustat has an additional field f_blksize that is unknown elsewhere. HP warns: For some file systems, the number of free inodes does not change. Such file systems will return -1 in the field f_tinode. For some file systems, inodes are dynamically allocated. Such file systems will return the current number of free inodes.

"SEE ALSO"

statfs(2), stat(2)

 
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