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NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | VERSIONS | CONFORMING TO | NOTES | SEE ALSO | COLOPHON |
USTAT(2) Linux Programmer's Manual USTAT(2)
ustat - get filesystem 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 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').
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
filesystem.
ENOSYS The mounted filesystem referenced by dev does not support this
operation, or any version of Linux before 1.3.16.
Since version 2.28, glibc no longer provides a wrapper for this
system call.
SVr4.
ustat() is deprecated and has been provided only for compatibility.
All new programs should use statfs(2) instead.
HP-UX notes
The HP-UX version of the ustat structure has an additional field,
f_blksize, that is unknown elsewhere. HP-UX warns: For some
filesystems, the number of free inodes does not change. Such
filesystems will return -1 in the field f_tinode. For some
filesystems, inodes are dynamically allocated. Such filesystems will
return the current number of free inodes.
stat(2), statfs(2)
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Linux 2019-03-06 USTAT(2)
Pages that refer to this page: syscalls(2)
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