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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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2
Userland/Libraries/LibC/unistd.h
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@ -108,8 +108,6 @@ int chown(const char* pathname, uid_t, gid_t);
int fchown(int fd, uid_t, gid_t);
int ftruncate(int fd, off_t length);
int truncate(const char* path, off_t length);
int halt();
int reboot();
int mount(int source_fd, const char* target, const char* fs_type, int flags);
int umount(const char* mountpoint);
int pledge(const char* promises, const char* execpromises);