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yushuailong
d0e6183d1a
readdir() returned NULL at end-of-directory without ensuring errno was clean. POSIX requires errno to be unchanged at EOF, but the underlying read() path may leave a stale errno value. Callers that follow the POSIX idiom (set errno to 0 before the call, test it after a NULL return), such as readdir_r() and scandir(), then misread this as a readdir() failure. Save errno on entry and restore it on the end-of-directory return so that EOF no longer reports a spurious error, while genuine errors (read() returning a negative value) still propagate. Signed-off-by: yushuailong <yyyusl@qq.com>