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Kernel+Userland: Introduce a new way to reboot and poweroff the machine

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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.
This commit is contained in:
Liav A 2021-09-11 12:20:47 +03:00 • committed by Andreas Kling
parent 06e95d0fd7
commit 8d0dbdeaac
11 changed files with 161 additions and 97 deletions
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12
Userland/Libraries/LibC/unistd.cpp
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@ -715,18 +715,6 @@ int fsync(int fd)
__RETURN_WITH_ERRNO(rc, rc, -1);
}
int halt()
{
int rc = syscall(SC_halt);
__RETURN_WITH_ERRNO(rc, rc, -1);
}
int reboot()
{
int rc = syscall(SC_reboot);
__RETURN_WITH_ERRNO(rc, rc, -1);
}
int mount(int source_fd, const char* target, const char* fs_type, int flags)
{
if (!target || !fs_type) {