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NAME
       sysfs - get file system type information


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

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

       int sysfs(int option);


DESCRIPTION
       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.


RETURN VALUE
       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.


ERRORS
       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.


CONFORMING TO
       SVr4.


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


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