1USTAT(2)                   Linux Programmer's Manual                  USTAT(2)
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NAME

6       ustat - get filesystem statistics
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SYNOPSIS

9       #include <sys/types.h>
10       #include <unistd.h>    /* libc[45] */
11       #include <ustat.h>     /* glibc2 */
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13       int ustat(dev_t dev, struct ustat *ubuf);
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DESCRIPTION

16       ustat()  returns  information about a mounted filesystem.  dev is a de‐
17       vice number identifying a device containing a mounted filesystem.  ubuf
18       is a pointer to a ustat structure that contains the following members:
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20           daddr_t f_tfree;      /* Total free blocks */
21           ino_t   f_tinode;     /* Number of free inodes */
22           char    f_fname[6];   /* Filsys name */
23           char    f_fpack[6];   /* Filsys pack name */
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25       The  last two fields, f_fname and f_fpack, are not implemented and will
26       always be filled with null bytes ('\0').
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RETURN VALUE

29       On success, zero is returned and the ustat structure pointed to by ubuf
30       will be filled in.  On error, -1 is returned, and errno is set to indi‐
31       cate the error.
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ERRORS

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

42       Since  version 2.28, glibc no longer provides a wrapper for this system
43       call.
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CONFORMING TO

46       SVr4.
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NOTES

49       ustat() is deprecated and has been  provided  only  for  compatibility.
50       All new programs should use statfs(2) instead.
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52   HP-UX notes
53       The  HP-UX  version  of  the  ustat  structure has an additional field,
54       f_blksize, that is unknown elsewhere.  HP-UX warns: For  some  filesys‐
55       tems, the number of free inodes does not change.  Such filesystems will
56       return -1 in the field f_tinode.  For some filesystems, inodes are  dy‐
57       namically  allocated.   Such filesystems will return the current number
58       of free inodes.
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SEE ALSO

61       stat(2), statfs(2)
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COLOPHON

64       This page is part of release 5.13 of the Linux  man-pages  project.   A
65       description  of  the project, information about reporting bugs, and the
66       latest    version    of    this    page,    can     be     found     at
67       https://www.kernel.org/doc/man-pages/.
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71Linux                             2021-03-22                          USTAT(2)
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