24 lines
1.2 KiB
Go
24 lines
1.2 KiB
Go
// Copyright 2026 Alibaba Group
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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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// Package process provides cross-platform process-existence checks. Used by
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// the bus daemon's stale-lock recovery path: bus.lock holds the daemon's PID;
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// on startup a competing process reads that PID and calls Alive() to decide
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// whether to abort (the holder is still running) or steal the lock (orphan).
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//
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// On Unix this is the standard signal-0 trick (syscall.Kill(pid, 0)) which
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// errors with ESRCH if the process is gone. On Windows it uses OpenProcess
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// with PROCESS_QUERY_LIMITED_INFORMATION and GetExitCodeProcess to detect
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// STILL_ACTIVE; this avoids the Unix-only assumption in plan §1.
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package process
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