WG15 Defect Report Ref: 9945-1-45
Topic: creat() - implementation restrictions

This is an approved interpretation of 9945-1:1990.


Last update: 1997-05-20

                                                                9945-1-90 #45

	Topic:			creat() - implementation restrictions
	Relevant Sections:	8.2.3
	Classification:		No change.

Defect Report:

Chapter 8 of POSIX.1 lists the functions required from the C
Standard, required as part of POSIX.1 with the C Language
Binding.  Section 8.1 lines 25-29 specify the particular
input/output functions required.  Section 8.2 lines 193-198
state that functions from the C standard which "creat[e] a
file shall do so as if they called the creat() function"
with specified flags.  Section 8.2.3 lines 341-345 describe
that each function operating on a stream has "underlying
functions" which "share certain traits with the underlying
functions, but [do] not require that there be any relation
between the implementations of the stream function and its
underlying functions."

        Although section 8.2.3 clearly allows for independent
	implementation of the function from its underlying
	functions, are restrictions placed on the underlying
	function implicitly applied to the function listed
	here?  For example, if an additional standard (such
	as POSIX.6) imposes additional restrictions on write(),
	are they automatically imposed on functions which use
	write() as an underlying function (such as fprintf()
	or fputs()) by virtue of the requirement to "share
	certain traits"?  Or must the additional standard
	explicitly spell out equivalent restrictions for the
	functions from the C standard?

(Jeremy Epstein)

WG15 response for ISO/IEC 9945-1:1990 (IEEE Std 1003.1-1990)
Please refer to interpretations #43 and #44 respectively.