ustat — get file system statistics
#include <sys/types.h> #include <unistd.h> /* libc[45] */ #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
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 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.
ubuf points
outside of your accessible address space.
dev does not
refer to a device containing a mounted file system.
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 only been provided 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 free inodes.
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