linux-user: implement pipe2 [v3]
implement pipe2 syscall.
[v2] fix do_pipe on mips and sh4
[v3] use pipe2 to ensure atomicity, but only when it is available.
Signed-off-by: NRiku Voipio <riku.voipio@iki.fi>
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implement pipe2 syscall.
[v2] fix do_pipe on mips and sh4
[v3] use pipe2 to ensure atomicity, but only when it is available.
Signed-off-by: NRiku Voipio <riku.voipio@iki.fi>