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f3daf21802
When swift-format crashes before we send all data to its stdin, we get a SIGPIPE when trying to write more data to its studio on Linux. This, in turn, takes SourceKit-LSP down. Do the same trick that we do when launching `JSONRPCConnection` of disabling SIGPIPE globally if we can’t disable it for individual pipes. rdar://147665695
48 lines
1.9 KiB
Swift
48 lines
1.9 KiB
Swift
//===----------------------------------------------------------------------===//
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//
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// This source file is part of the Swift.org open source project
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//
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// Copyright (c) 2014 - 2021 Apple Inc. and the Swift project authors
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// Licensed under Apache License v2.0 with Runtime Library Exception
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//
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// See https://swift.org/LICENSE.txt for license information
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// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
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//
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//===----------------------------------------------------------------------===//
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#if canImport(Glibc)
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import Glibc
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#elseif canImport(Musl)
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import Musl
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#elseif canImport(Android)
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import Android
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#endif
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#if canImport(Glibc) || canImport(Musl) || canImport(Android)
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// This is a lazily initialised global variable that when read for the first time, will ignore SIGPIPE.
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private let globallyIgnoredSIGPIPE: Bool = {
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/* no F_SETNOSIGPIPE on Linux :( */
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_ = signal(SIGPIPE, SIG_IGN)
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return true
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}()
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#endif
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/// We receive a `SIGPIPE` if we write to a pipe that points to a crashed process. This in particular happens if the
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/// target of a `JSONRPCConnection` has crashed and we try to send it a message or if swift-format crashes and we try
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/// to send the source file to it.
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///
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/// On Darwin, `DispatchIO` ignores `SIGPIPE` for the pipes handled by it and swift-tools-support-core offers
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/// `LocalFileOutputByteStream.disableSigpipe`, but that features is not available on Linux.
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///
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/// Instead, globally ignore `SIGPIPE` on Linux to prevent us from crashing if the `JSONRPCConnection`'s target crashes.
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///
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/// On Darwin platforms and on Windows this is a no-op.
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package func globallyDisableSigpipeIfNeeded() {
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#if !canImport(Darwin) && !os(Windows)
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let haveWeIgnoredSIGPIEThisIsHereToTriggerIgnoringIt = globallyIgnoredSIGPIPE
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guard haveWeIgnoredSIGPIEThisIsHereToTriggerIgnoringIt else {
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fatalError("globallyIgnoredSIGPIPE should always be true")
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}
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#endif
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}
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