Re: Problem using poule, zero? error in scsh-process

On Apr 30 2025, 16:01 +0000, Matt Welland via Chicken-users <[email protected]> wrote:
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>Inserting the example code from poule into my existing project gives me the
>error below. I'm compiling statically but that doesn't seem to be a problem
>as I compiled the poule example statically and it worked fine. Everything
>else in my program works fine. I'll work around this for now but I can try
>any suggestions provided or dig deeper with any provided advice. Thanks.
>
>Error: (zero?) bad argument type - not a number: #f

poule uses (zero?) with the first value returned by (process-wait):
https://code.ptrcrt.ch/poule/file?ci=v0.1.1&name=poule.scm&ln=253-254

scsh-process substitutes (process-wait) with its own implementation:
https://api.call-cc.org/5/doc/scsh-process#sec:Process_reaping
https://code.more-magic.net/scsh-process/tree/scsh-process.scm?h=chicken-5#n125

It's possible for this implementation to return #f for the pid:
https://code.more-magic.net/scsh-process/tree/scsh-process.scm?h=chicken-5#n168


>
>Call history:
>
>/home/matt/data/hyphaworld/hmgr/build/dsjobs.scm:283: g2000
>/home/matt/data/hyphaworld/hmgr/build/dsjobs.scm:283: g2000
>/home/matt/data/hyphaworld/hmgr/build/dsjobs.scm:284: g2011
>/home/matt/data/hyphaworld/hmgr/build/dsjobs.scm:284: g2028
>scsh-process.scm:127: ##sys#call-with-values
>scsh-process.scm:127: wait
>scsh-process.scm:110: llrb-fixnum-table#table-ref/default
>scsh-process.scm:151: scheme#call-with-current-continuation
>scsh-process.scm:151: chicken.condition#with-exception-handler
>scsh-process.scm:151: ##sys#call-with-values
>scsh-process.scm:158: ##sys#call-with-values
>scsh-process.scm:159: posix-process-wait
>scsh-process.scm:168: scheme#values
>scsh-process.scm:151: k147
>scsh-process.scm:151: g150
>scsh-process.scm:127: scheme#values   <--

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