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ipcBeginProcess() and system() yield different results

Kevin Buck

I'm running the following bit of SKILL:

grepDRC = ipcBeginProcess("[my regular expression]")

ipcWait(grepDRC)

resultStringDRC=ipcReadProcess(grepDRC)

This returns "\n" when I query resultsStringDRC. However when I run the following command:

system("[my regular expression]")

I get a different result (actually the expected one). If I run the same command from the terminal I get the same output as the system command. Anyone know what's going on here?

I'm using Cadence version IC6.1.8-64b.500.9

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  • Not without you showing what the "[my regular expression]' actually is. I'm sure it's not literally that (because that would give an error).

    Given that system() doesn't return any output - it just returns the status - any output appears in the terminal, whereas ipcBeginProcess allows you to retrieve the standard output, so they are clearly different anyway, but it's unclear to me what the problem is you're describing...

    Andrew

  • in reply to Andrew Beckett

    Sorry I realize that I didn't explain that well enough. I was just using system because I was not getting the expected result and I was trying to troubleshoot. When I enter a simple regular expression for ipcBeginProcess it seems to work. The regular expression I'm having an issue with is:

    "rg 'Run Result\s+:\s+(\w+)' -Nor '$1' ./folder/subfolder/filename.rep.cls"

    The tool complained about the backslashes not being followed by valid characters so I also tried escaping them with an additional backslash. This is when I get \n returned otherwise it returns nil.

  • in reply to Kevin Buck

    Hi Kevin,

    In general backslashes in SKILL need to be escaped as they are special to SKILL. I didn't have "rg" installed, so I located it and downloaded it to try it out. Other than the backslashes needing escaping, it seems that the $1 causes a problem - it's probably getting interpreted somewhere en route. I found that if I do:

    ipcId=ipcBeginProcess("rg 'Run Result\\s+:\\s+(\\w+)' -Nor '\\$1' ./folder/subfolder/filename.rep.cls")
    ipcWait(ipcId)
    data=ipcReadProcess(ipcId)

    then it should read the output of the command OK.

    Regards,

    Andrew

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