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53 lines
1.9 KiB
C
53 lines
1.9 KiB
C
/*
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* Copyright 2024 Google LLC
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#pragma once
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// Definitions used to implement runlevels.
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//
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// The set of runlevels is defined in the runlevel.def X-Macro file. These
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// definitions are used to construct two enums, RunLevel (in runlevel.h) and
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// RunLevelBit (in this header).
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//
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// The set of runlevels for which a service should be enabled is defined by
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// bitwise-OR-ing the RunLevelBit constants for every runlevel that the service
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// should be enabled in to form an enable-mask. Testing whether a service should
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// be enabled for a given runlevel is simply
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// (enable_mask & (1 << runlevel) != 0).
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//
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// The RunLevelBit constants take the form R_<name> to minimize visual clutter
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// when defining enable-masks. Since this header is only included in the source
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// files for which enable-masks are defined, the potential for namespace
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// pollution is minimized.
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#define RUNLEVEL(number, name) _Static_assert( \
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0 <= number && number <= 31, \
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"The numeric value of runlevel " #name " (" #number ")" \
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" is out of range. Only runlevels in the range 0 <= level <= 31" \
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" are supported.");
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#include "runlevel.def"
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#undef RUNLEVEL
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typedef enum RunLevelBit {
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#define RUNLEVEL(number, name) R_##name = (1 << number),
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#include "runlevel.def"
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#undef RUNLEVEL
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} RunLevelBit;
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struct ServiceRunLevelSetting {
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void (*set_enable_fn)(bool);
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RunLevelBit enable_mask;
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};
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