76f91f67a6
inotify exposes a /proc interface to limit kernel memory usage. If those limits are set too low, inotify cannot add all watches. The integration test verifies, that Inotify yields an error in that case.
23 lines
812 B
Swift
23 lines
812 B
Swift
import Foundation
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func withInotifyWatchLimit(of limit: Int, _ body: () async throws -> Void) async throws {
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let confPath = URL(filePath: "/proc/sys/fs/inotify")
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let filenames = ["max_user_watches", "max_user_instances", "max_queued_events"]
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var previousLimits: [String: String] = [:]
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for filename in filenames {
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let filePath = confPath.appending(path: filename)
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let currentLimit = try String(contentsOf: filePath, encoding: .utf8)
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previousLimits[filename] = currentLimit
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try "\(limit)".write(to: filePath, atomically: false, encoding: .utf8)
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}
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try await body()
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for filename in filenames {
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let filePath = confPath.appending(path: filename)
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guard let previousLimit = previousLimits[filename] else { continue }
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try previousLimit.write(to: filePath, atomically: false, encoding: .utf8)
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}
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}
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