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Description
I've already opened a PR for this issue, but wanted to open an issue for documenting purposes.
Copy-pasta from the PR description:
I have a Swift CLI that utilizes ShellOut to interact with binary executables. When I use shellOut too many times, I sometimes hit an exception that looks something like:
*** Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'Failed to set posix_spawn_file_actions for fd -1 at index 0 with errno 9'
*** First throw call stack:
(
0 CoreFoundation 0x00000001859672ec __exceptionPreprocess + 176
1 libobjc.A.dylib 0x000000018544e788 objc_exception_throw + 60
2 Foundation 0x0000000186a92eb4 -[NSConcreteTask launchWithDictionary:error:] + 4240
I've been able to determine this is due to the Pipe objects from ShellOut not being closed properly.
I've included an example project that demonstrates the issue:
NSExceptionExample.zip
Steps:
- Unzip the example library and
cd NSExceptionExample - Run
swift run NSExceptionExample - While that command is still running, in a separate terminal window, run
ps aux | grep NSExceptionExampleand take note of the PID. - Run
lsof -p <pid> | wc -l - Notice how this number is quite large. Also notice that running again shows the number increasing.
- If the
swiftcommand runs long enough, you'll hit an exception like the above.
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