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Spawn cat in its own session in testSuspendResumeProcess() #308

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Merged
iCharlesHu merged 1 commit into from
Jun 11, 2026
Merged

Spawn cat in its own session in testSuspendResumeProcess() #308

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9 changes: 9 additions & 0 deletions Tests/SubprocessTests/UnixTests.swift
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Original file line number Diff line number Diff line change
Expand Up @@ -378,10 +378,19 @@ extension SubprocessUnixTests {
let flags = fcntl(outputPipe.readEnd.rawValue, F_GETFL)
try #require(fcntl(outputPipe.readEnd.rawValue, F_SETFL, flags | O_NONBLOCK) == 0)

// Isolate cat in its own session: the SIGSTOP below would otherwise
// leave a stopped process in the test runner's process group, and a
// concurrent child exit that orphans that group makes the kernel
// deliver SIGHUP+SIGCONT to every member of the group, including this
// test process, killing the run.
var platformOptions = PlatformOptions()
platformOptions.createSession = true

try await outputPipe.readEnd.closeAfter {
try await inputPipe.writeEnd.closeAfter {
_ = try await Subprocess.run(
.path("/bin/cat"),
platformOptions: platformOptions,
// cat reads from inputPipe.readEnd. The parent keeps writeEnd to feed it.
input: .fileDescriptor(inputPipe.readEnd, closeAfterSpawningProcess: true),
// cat writes to outputPipe.writeEnd. The parent keeps readEnd to drain it.
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