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When power is removed from the device (resulting from an unplug, or a termination of host power), the device switches to battery power and begins a shutdown sequence. During this sequence, a SIGPWR signal is delivered to your application from the system init process, so your application can respond appropriately (for example, by saving or closing files).
If you want your application to receive the SIGPWR signal, the application must register a SIGPWR handler with the kernel (see the sigaction(2) man page for more information).
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