On Mon, Jul 26, 2010 at 10:47 AM, Magnus Therning wrote:

On Sun, Jul 25, 2010 at 23:47, Lally Singh wrote:

...

Hey all,

 This is on OpenSolaris.  Simple attempts to build cabal packages give me this error, and I don't know what it means.  Here's an example: [07/25 18:51::lally@sol type-level]$ runghc Setup.hs configure Configuring type-level-0.2.4... Setup.hs: fd:8: hGetContents: resource exhausted (Resource temporarily unavailable) Setup.hs: fd:8: resource exhausted

Does anyone know what this means?  I'm trying to just get the llvm bindings installed (requiring mtl & type-level).

A quick guess: you're running out of filedescriptors.

The error gives the descriptor number as 8, so I don't think that's terribly likely :) Resource temporarily unavailable is the string that corresponds to the EAGAIN error, which is typically presented by operations that would block being used in non-blocking mode. I have no idea what would cause it to be a fatal error in a hGetContents call.

Quoth Lally Singh , ...

I've got my own source build of ghc. Is there anything I can put in to track down what's going on?

Much easier (but not guaranteed to help) you might be able to see the actual error, at the system call level, if you can trace system calls. The utility for this varies by platform, but e.g. "strace" or "ktrace". Donn Cave, donn@avvanta.com

Ah, it's getting EAGAIN from fds created from prior pipe() calls. The other sides look like they were DUP2'd to fds 0&1, I'm guessing for a fork/exec(). On Mon, Jul 26, 2010 at 10:23 PM, Brandon S Allbery KF8NH wrote:

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On 7/26/10 21:01 , Donn Cave wrote:

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Much easier (but not guaranteed to help) you might be able to see the actual error, at the system call level, if you can trace system calls.  The utility for this varies by platform, but e.g. "strace" or "ktrace".

On Solaris it's truss.

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On Wed, Jul 28, 2010 at 4:21 PM, Donn Cave wrote:

Quoth Lally Singh ,

...

Ah, it's getting EAGAIN from fds created from prior pipe() calls.  The other sides look like they were DUP2'd to fds 0&1, I'm guessing for a fork/exec().

Well, that isn't a big surprise - it's the way you would expect to get EAGAIN.  So ... evidently the GHC runtime is broken somehow on OpenSolaris?  I personally have no idea what's going on there, but while we're waiting for someone with a clue, here are a couple more random things to try:

Have you compiled and run separately?  instead of

...

runghc Setup.hs configure

 ghc --make Setup  Setup configure

It shouldn't make any difference on its own, but then you can try options on the compile, like "ghc -threaded", and runtime flags like "Setup +RTS -V0 -RTS"  I suggest that because it cuts down on signal interrupts from the runtime, and your symptoms suggest a signal interrupt.

That fixed the signal problem! Sadly that just gets me far enough to Setup +RTS -V0 -RTS build, which runs ghc, which then dies from the same signal problem :-(

Quoth Lally Singh , ...

That fixed the signal problem!

Sadly that just gets me far enough to Setup +RTS -V0 -RTS build, which runs ghc, which then dies from the same signal problem :-(

Well, yeah - a solution it is not, but we sure know a lot about the problem now. Your ghc is fundamentally broken - hGetContents, a very commonly used base library function, can't survive the runtime's own timer signals. Obviously this doesn't happen for other users, maybe even on OpenSolaris? I'm sure someone has a clue how this could happen. Donn Cave, donn@avvanta.com