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what's the problem with a system call

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whats the disadvantage when calling a system command from Perl?i.e, system call to "rsync" rather than using the File::Rsync module. is it hard to control the signals between the caller process and the called system command?

posted May 14, 2013 by anonymous

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2 Answers

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Well, usually using a module you have access to several things in a
Perl way, like for instance to the arguments to pass to the command as
an hash or an array. instead of a string. Moreover, the perl module
could have some workarounds to provide you better portability.

answer May 14, 2013 by anonymous
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The only real disadvantage is portability, perhaps speed (e.g. PerlIO::gzip is faster than calling gzip itself, and if youre shelling out multiple times, itll generally be slower than simply using a module).
Additionally, if youre passing user-provided arguments to the outside command and arent doing things "properly", that is, you arent using IPC::Cmd, IPC::Run, or multi-arg open, you have a potential security hole in your program.

But if what youre doing doesnt gain any advantages from increased portability or security, theres nothing wrong with calling a system command.

answer May 14, 2013 by anonymous
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Above link only shows calling from C to perl.

What I want to do is to create a function in C code and somehow export it to my embedded perl interpreter. Then I want to be able to call this C function from perl code.

Can someone point me to a good example on how to do this?

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There seem to be two modules for it, yet none of them seems to let you do it --- if they do, the documentation doesn't have any example of how to do it.

The alternative seems to be to write MS excel files, and I don't really want to resort to that.