Editing Magic cookie (section)

== Early use ==
The term ''magic cookie'' appears in the [[man page]] for the [[fseek]] routine in the C standard library, dating back at least to 1979, where it was stated:
* "''ftell'' returns the current value of the offset relative to the beginning of the file associated with the named ''stream''. It is measured in bytes on UNIX; on some other systems it is a magic cookie, and the only foolproof way to obtain an ''offset'' for ''fseek''."<ref>UNIX Programmer's Manual, 7th Edition, Vol. 1, FSEEK (3S), Bell Telephone Laboratories, Murray Hill, New Jersey, January 1979.</ref><ref>UNIX Programmer's Manual, Vol. II (Library), FSEEK (3S), 4.2 BSD, 12 Feb 1983.</ref><ref>Bell Telephone Laboratories, Incorporated. "FSEEK(3S)." In ''UNIX Time-Sharing System: UNIX Programmer’s Manual'', Revised and expanded version of 7th Edition, Volume 1, page 263. New York: Holt, Rinehart and Winston, 1983. https://archive.org/details/unixtimesharings0001bell</ref>