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The following functions accept an object representing a protocol and return a selected component:
The following procedures are used to search the protocol database:
getprotobynametakes a string argument, and
getprotobynumbertakes an integer argument.
getprotowill accept either type, behaving like
getprotoent(see below) if no arguments are supplied.
The following procedures may be used to step through the protocol database from beginning to end.
getprotoent, and may also be called afterward to reset the protocol entry stream. If stayopen is supplied and is not
#f, the database is not closed by subsequent
getprotobynumbercalls, possibly giving an efficiency gain.
getprotoent. The return value is unspecified.
endprotoent. Otherwise it is equivalent to
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