Fix signal handler about zimg HOT 7 CLOSED

OK I see. I will try another way to process logs in future.

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Using async-signal-safe functions in log_handler instead of log_printf0().
Changes like redis: redis/redis#213

from zimg.

I wonder a bit about the references to Redis in this update. I find two statements also inappropriate in your function "sighandler".

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Thanks very much.
@elfring Do you mean fprintf() and exit() ? I have removed them in the latest commit.
And strcat() is safe. More infomation:
http://austingroupbugs.net/view.php?id=692#c1609

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Would you like to achieve a program termination there?

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Yes, the signal handler here just hooks termination signals.

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Thanks for your small source code improvement.

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