linux-user: pause() should not pause if signal pending
Fix races between signal handling and the pause syscall by reimplementing it using block_signals() and sigsuspend(). (Using safe_syscall(pause) would also work, except that the pause syscall doesn't exist on all architectures.) Signed-off-by: Timothy Edward Baldwin <T.E.Baldwin99@members.leeds.ac.uk> Message-id: 1441497448-32489-28-git-send-email-T.E.Baldwin99@members.leeds.ac.uk [PMM: tweaked commit message] Reviewed-by: Peter Maydell <peter.maydell@linaro.org> Signed-off-by: Peter Maydell <peter.maydell@linaro.org> Signed-off-by: Riku Voipio <riku.voipio@linaro.org>
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@ -7059,7 +7059,10 @@ abi_long do_syscall(void *cpu_env, int num, abi_long arg1,
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#endif
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#ifdef TARGET_NR_pause /* not on alpha */
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case TARGET_NR_pause:
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ret = get_errno(pause());
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if (!block_signals()) {
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sigsuspend(&((TaskState *)cpu->opaque)->signal_mask);
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}
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ret = -TARGET_EINTR;
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break;
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#endif
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#ifdef TARGET_NR_utime
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