ustat (2) Linux Manual Page
ustat – get filesystem statistics
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 filesystem. dev is a device number identifying a device containing a mounted filesystem. 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 bytes (‘\0’).
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
- EFAULT
- ubuf points outside of your accessible address space.
- EINVAL
- dev does not refer to a device containing a mounted filesystem.
- ENOSYS
- The mounted filesystem referenced by dev does not support this operation, or any version of Linux before 1.3.16.