7.7 Backup and restore

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int peios_reg_backup(int key_fd, int output_fd);
int peios_reg_restore(int key_fd, int input_fd);
  • peios_reg_backup exports the key and its entire subtree to output_fd (needs SeBackupPrivilege). It takes a read-only snapshot and performs no per-key access check — the privilege is the gate. Errors: EPERM/EACCES, EBADF (output not writable), ENOENT, ENOTSUP, EBUSY.
  • peios_reg_restore replaces the key and its entire subtree from input_fd (needs SeRestorePrivilege), applied in one transaction. Errors: EPERM/EACCES, EBADF (input not readable), EINVAL (malformed stream), EEXIST (GUID collision), EOVERFLOW.

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