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

6       sysfs - get filesystem type information
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SYNOPSIS

9       int sysfs(int option, const char *fsname);
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11       int sysfs(int option, unsigned int fs_index, char *buf);
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13       int sysfs(int option);
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DESCRIPTION

16       Note:  if  you  are  looking for information about the sysfs filesystem
17       that is normally mounted at /sys, see sysfs(5).
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19       The (obsolete)  sysfs()  system  call  returns  information  about  the
20       filesystem types currently present in the kernel.  The specific form of
21       the sysfs() call and the information returned depends on the option  in
22       effect:
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24       1  Translate  the filesystem identifier string fsname into a filesystem
25          type index.
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27       2  Translate the filesystem type index fs_index into a  null-terminated
28          filesystem  identifier  string.   This string will be written to the
29          buffer pointed to by buf.  Make sure that buf has  enough  space  to
30          accept the string.
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32       3  Return the total number of filesystem types currently present in the
33          kernel.
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35       The numbering of the filesystem type indexes begins with zero.
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RETURN VALUE

38       On success, sysfs() returns the filesystem index for option 1, zero for
39       option 2, and the number of currently configured filesystems for option
40       3.  On error, -1 is returned, and errno is set appropriately.
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ERRORS

43       EFAULT Either fsname or buf is outside your accessible address space.
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45       EINVAL fsname is not a valid filesystem type  identifier;  fs_index  is
46              out-of-bounds; option is invalid.
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CONFORMING TO

49       SVr4.
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NOTES

52       This  System-V  derived system call is obsolete; don't use it.  On sys‐
53       tems  with  /proc,  the  same   information   can   be   obtained   via
54       /proc/filesystems; use that interface instead.
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BUGS

57       There  is no libc or glibc support.  There is no way to guess how large
58       buf should be.
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COLOPHON

61       This page is part of release 5.04 of the Linux  man-pages  project.   A
62       description  of  the project, information about reporting bugs, and the
63       latest    version    of    this    page,    can     be     found     at
64       https://www.kernel.org/doc/man-pages/.
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68Linux                             2017-09-15                          SYSFS(2)
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