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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  NUL-
              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.




       On   Linux  with  the  proc  filesystem  mounted  on  /proc,  the  same
       information can be derived from /proc/filesystems.


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