ustat(2) - f39

1ustat(2)                      System Calls Manual                     ustat(2)
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NAME

6       ustat - get filesystem statistics
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LIBRARY

9       Standard C library (libc, -lc)
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SYNOPSIS

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

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

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

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

45       None.
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HISTORY

48       SVr4.  Removed in glibc 2.28.
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50       ustat()  is  deprecated  and  has been provided only for compatibility.
51       All new programs should use statfs(2) instead.
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53   HP-UX notes
54       The HP-UX version of the  ustat  structure  has  an  additional  field,
55       f_blksize,  that  is unknown elsewhere.  HP-UX warns: For some filesys‐
56       tems, the number of free inodes does not change.  Such filesystems will
57       return  -1 in the field f_tinode.  For some filesystems, inodes are dy‐
58       namically allocated.  Such filesystems will return the  current  number
59       of free inodes.
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