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       sysfs - get filesystem type information


       int sysfs(int option, const char *fsname);

       int sysfs(int option, unsigned int fs_index, char *buf);

       int sysfs(int option);


       sysfs()  returns  information  about the filesystem types currently present in the kernel.
       The specific form of the sysfs() call and the information returned depends on  the  option
       in effect:

       1  Translate the filesystem identifier string fsname into a filesystem type index.

       2  Translate  the  filesystem  type  index  fs_index  into  a  null-terminated  filesystem
          identifier string.  This string will be written to the buffer pointed to by buf.   Make
          sure that buf has enough space to accept the string.

       3  Return the total number of filesystem types currently present in the kernel.

       The numbering of the filesystem type indexes begins with zero.


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


       EFAULT Either fsname or buf is outside your accessible address space.

       EINVAL fsname is not a valid filesystem type identifier; fs_index is out-of-bounds; option
              is invalid.




       This System-V derived system call is obsolete; don't use it.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


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


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