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Kernel+Userland: Introduce a new way to reboot and poweroff the machine
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.
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11 changed files with 161 additions and 97 deletions
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@ -715,18 +715,6 @@ int fsync(int fd)
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__RETURN_WITH_ERRNO(rc, rc, -1);
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}
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int halt()
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{
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int rc = syscall(SC_halt);
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__RETURN_WITH_ERRNO(rc, rc, -1);
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}
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int reboot()
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{
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int rc = syscall(SC_reboot);
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__RETURN_WITH_ERRNO(rc, rc, -1);
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}
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int mount(int source_fd, const char* target, const char* fs_type, int flags)
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{
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if (!target || !fs_type) {
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