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       sysfs - get file system 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  file  system 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  file-system  identifier  string  fsname into a file-
          system type index.

       2  Translate the file-system type index fs_index into a null-terminated
          file-system  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 file system types currently present in
          the kernel.

       The numbering of the file-system type indexes begins with zero.


       On success, sysfs() returns the file-system index for  option  1,  zero
       for  option  2, and the number of currently configured file systems 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 file-system 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       This  System-V  derived  system  call  is  obsolete;  don't use it.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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