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When we were first contemplating whether to go to court and challenge the validity of the UNIX trademark, vs. doing the UNIX conformance work, Apple was really interested in which route would end up costing less.Ī $200M+ lawsuit had ben filed against Apple, based on Apple’s use of the UNIX trademark, which was exclusively licensed to The Open Group.Īs one of the steps in this process, the engineering group, specifically, Apple Core OS, was tasked to “size the task of UNIX conformance”.
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So a representative of The Open Group (Norm) flew out and the technical lead (Ed) on libSystem - that’s the C and math libraries -and myself on the Mac OS X kernel side of things, made one test fully pass. We did this by correcting a single system header file to not expose extraneous symbols - in the same way that an omnibus header file does.Īnd then we built the world - every piece of software Apple ships - with the modified version of the header file. This header declares several useful library functions for performing "istream input and output" from a program.The change was not that large, actually, but we’d chosen the header file on purpose, because we wanted the largest impact we could get. It is not part of the C standard library or ISO C, nor is it defined by POSIX. H is a C header file used mostly by MS-DOS compilers to provide console input/output.
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h: No such file or directory', it means this library is not installed. But if you are getting error like fatal error: curses. If you don't include the appropriate headers, the compiler has to guess the prototype of any library functions your program uses. There are two kinds of entities that read C source code: compilers (and I guess interpreters) and programmers. Now, we have got the complete detailed explanation and answer for everyone, who is interested!
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This is a question our experts keep getting from time to time.
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