sysfs (2)

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 null-termi-
              nated 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

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

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

CONFORMING TO

       SVr4.

NOTE

       On  Linux  with the proc filesystem mounted on /proc, the same informa-
       tion 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.