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[analyzer][StdLibraryFunctionsChecker] Add POSIX networking functions
Summary: Adding networking functions from the POSIX standard (2017). This includes functions that deal with sockets from socket.h, netdb.h. In 'socket.h' of some libc implementations (e.g. glibc) with C99, sockaddr parameter is a transparent union of the underlying sockaddr_ family of pointers instead of being a pointer to struct sockaddr. In these cases, the standardized signature will not match, thus we try to match with another signature that has the joker Irrelevant type. In the case of transparent unions, we also not add those constraints which require pointer types for the sockaddr param. Interestingly, in 'netdb.h' sockaddr is not handled as a transparent union. Tags: #clang Differential Revision: https://reviews.llvm.org/D83407
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