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8d0dbdeaac
This change removes the halt and reboot syscalls, and create a new mechanism to change the power state of the machine. Instead of how power state was changed until now, put a SysFS node as writable only for the superuser, that with a defined value, can result in either reboot or poweroff. In the future, a power group can be assigned to this node (which will be the GroupID responsible for power management). This opens an opportunity to permit to shutdown/reboot without superuser permissions, so in the future, a userspace daemon can take control of this node to perform power management operations without superuser permissions, if we enforce different UserID/GroupID on that node.
25 lines
571 B
C++
25 lines
571 B
C++
/*
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* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
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* Copyright (c) 2021, Liav A. <liavalb@hotmail.co.il>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <fcntl.h>
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#include <stdio.h>
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#include <unistd.h>
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int main(int, char**)
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{
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int power_state_switch_node = open("/sys/firmware/power_state", O_WRONLY);
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if (power_state_switch_node < 0) {
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perror("open");
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return 1;
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}
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const char* value = "2";
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if (write(power_state_switch_node, value, 1) < 0) {
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perror("write");
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return 1;
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}
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return 0;
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}
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