ustat(2)

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

6       ustat - get file system 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 file system.  dev is a
17       device number identifying a device containing a  mounted  file  system.
18       ubuf is a pointer to a ustat structure that contains the following mem‐
19       bers:
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22              daddr_t f_tfree;                /* Total free blocks */
23              ino_t   f_tinode;               /* Number of free inodes */
24              char    f_fname[6];             /* Filsys name */
25              char    f_fpack[6];             /* Filsys pack name */
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27       The last two fields, f_fname and f_fpack, are not implemented and  will
28       always be filled with null bytes ('\0').
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RETURN VALUE

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

36       EFAULT ubuf points outside of your accessible address space.
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38       EINVAL dev does not refer to a device containing a mounted file system.
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40       ENOSYS The  mounted file system referenced by dev does not support this
41              operation, or any version of Linux before 1.3.16.
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CONFORMING TO

44       SVr4.
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NOTES

47       ustat() is deprecated and has only  been  provided  for  compatibility.
48       All new programs should use statfs(2) instead.
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HP-UX NOTES

51       The  HP-UX  version  of  the  ustat  structure has an additional field,
52       f_blksize, that is unknown elsewhere.  HP-UX warns: For some file  sys‐
53       tems,  the  number  of  free inodes does not change.  Such file systems
54       will return -1 in the field f_tinode.  For some  file  systems,  inodes
55       are  dynamically  allocated.  Such file systems will return the current
56       number of free inodes.
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