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[dev.power64] runtime: ignore rt_sigaction error if it's for SIGRTMAX.
Workaround a qemu linux user space emulation bug. ref: http://git.qemu.org/?p=qemu.git;a=blob;f=linux-user/signal.c;h=1141054be2170128d6f7a340b41484b49a255936;hb=HEAD#l82 LGTM=rsc R=rsc, iant CC=golang-codereviews https://golang.org/cl/124900043
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@ -312,7 +312,8 @@ runtime·setsig(int32 i, GoSighandler *fn, bool restart)
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if(fn == runtime·sighandler)
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fn = (void*)runtime·sigtramp;
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sa.sa_handler = fn;
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if(runtime·rt_sigaction(i, &sa, nil, sizeof(sa.sa_mask)) != 0)
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// Qemu rejects rt_sigaction of SIGRTMAX (64).
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if(runtime·rt_sigaction(i, &sa, nil, sizeof(sa.sa_mask)) != 0 && i != 64)
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runtime·throw("rt_sigaction failure");
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}
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