ustat(2) - f14

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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21           daddr_t f_tfree;      /* Total free blocks */
22           ino_t   f_tinode;     /* Number of free inodes */
23           char    f_fname[6];   /* Filsys name */
24           char    f_fpack[6];   /* Filsys pack name */
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26       The last two fields, f_fname and f_fpack, are not implemented and  will
27       always be filled with null bytes ('\0').
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RETURN VALUE

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

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

43       SVr4.
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NOTES

46       ustat() is deprecated and has only  been  provided  for  compatibility.
47       All new programs should use statfs(2) instead.
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49   HP-UX Notes
50       The  HP-UX  version  of  the  ustat  structure has an additional field,
51       f_blksize, that is unknown elsewhere.  HP-UX warns: For some file  sys‐
52       tems,  the  number  of  free inodes does not change.  Such file systems
53       will return -1 in the field f_tinode.  For some  file  systems,  inodes
54       are  dynamically  allocated.  Such file systems will return the current
55       number of free inodes.
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COLOPHON

61       This page is part of release 3.25 of the Linux  man-pages  project.   A
62       description  of  the project, and information about reporting bugs, can
63       be found at http://www.kernel.org/doc/man-pages/.
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67Linux                             2003-08-04                          USTAT(2)