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instruction: 0.595
runtime: 0.299
syscall: 0.105
linux-user emulation of setsockopt ignores optlen
setsockopt always treats the argument as a 4-byte int. This breaks timeout options (for which it's an 8- or 16-byte timeval structure, depending on word size) and possibly other socket options. int is probably a safe default, but options whose values are other types need special-case conversion code.
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