Note: if you are looking for information about the sysfs filesystem that is normally mounted at /sys, see sysfs(5).
The (obsolete) sysfs() system call returns information about the filesystem types currently present in the kernel. The specific form of the sysfs() call and the information returned depends on the option in effect:
Translate the filesystem identifier string fsname into a filesystem type index.
Translate the filesystem type index fs_index into a null-terminated filesystem 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 filesystem types currently present in the kernel.
The numbering of the filesystem type indexes begins with zero.
On success, sysfs() returns the filesystem index for option 1, zero for option 2, and the number of currently configured filesystems for option 3. On error, -1 is returned, and errno is set appropriately.