SEI CERT C Coding Standard

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When available (Linux 2.1.126+, FreeBSD, Solaris 10, POSIX.1-2008), the O_NOFOLLOW should also be used. (See POS01-C. Check for the existence of links when dealing with files.) When O_NOFOLLOW is not available, symbolic link checks should use the method from VOID POS35-C. Avoid race conditions while checking for the existence of a symbolic link.

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