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…assed address-of pointer variable, causing fcntl to receive an invalid pointer (EFAULT/lock failure). Aligns with POSIX fcntl(fd, cmd, struct flock*). Pure fix.
…ugfix: loop used scats->base/len, repeating the first buffer each iteration. Use iterator element to write each scatter segment.
…dup2\n\nIf target is closed, duplicate source fd; otherwise reuse target via dup2. Avoids dup2(old,-1) failure; no source-closed special-casing.
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