oldfstat(2) -- Linux man page
NAMEoldfstat, oldlstat, oldstat, oldolduname, olduname - obsolete system calls
SYNOPSISObsolete system calls.
DESCRIPTIONThe Linux 2.0 kernel implements these calls to support old executables. These calls return structures which have grown since their first implementation, but old executables must continue to receive old smaller structures.
CONFORMING TOThese calls are unique to Linux and should not be used at all in new programs.
SEE ALSOfstat(2), lstat(2), stat(2), uname(2), unimplemented(2)