sysfs() returns information about the file system types currently present in
The specific form of the
sysfs() call and the information returned depends on the
option in effect:
Translate the file-system identifier string
fsname into a file-system type index.
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.
Return the total number of file system types currently present in the
The numbering of the file-system type indexes begins with zero.
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.