CentOS 7.0 - man page for ustat (centos section 2)
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USTAT(2) Linux Programmer's Manual USTAT(2)
ustat - get file system statistics
#include <unistd.h> /* libc */
#include <ustat.h> /* glibc2 */
int ustat(dev_t dev, struct ustat *ubuf);
ustat() returns information about a mounted file system. dev is a device number identify-
ing 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; /* Filsys name */
char f_fpack; /* Filsys pack name */
The last two fields, f_fname and f_fpack, are not implemented and will always be filled
with null bytes ('\0').
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.
EFAULT ubuf points outside of your accessible address space.
EINVAL dev does not refer to a device containing a mounted file system.
ENOSYS The mounted file system referenced by dev does not support this operation, or any
version of Linux before 1.3.16.
ustat() is deprecated and has been provided only for compatibility. All new programs
should use statfs(2) instead.
The HP-UX version of the ustat structure has an additional field, f_blksize, that is
unknown elsewhere. HP-UX 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
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Linux 2003-08-04 USTAT(2)
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