io.popen not available on mac?

[Germanunkol]

Hi, I have a user who can't run my game on a mac, he gets this error message:
http://cl.widerwille.com/NBud

This is the code (note: when I got the error, I used io.open without the pcall - otherwise I would not have gotten the error message).

Code: Select all

function getCPUNumber()
	ok, f = pcall(io.popen,"nproc")
	if ok and f then
		local n = f:read("*a")
		f:close()
		return tonumber(n)
	end
end

Anyone know a workaround for this? How do I get the number of CPUs on a Mac if this way does not work?

Using Löve 0.8.0

[Taehl]

http://www.lua.org/manual/5.1/manual.html#pdf-io.popen

This function is system dependent and is not available on all platforms.

So, nope, looks like it's not available on Mac.

[slime]

It is technically available on OSX, but it doesn't work in the particular build of Lua that 0.8.0 for OSX is packaged with, for whatever reason. If you use a version of LÖVE built with LuaJIT, it should work fine.

EDIT: I just built LÖVE 0.8.0 using a fixed/upgraded version of Lua 5.1. io.popen should work now, and as a bonus it uses OpenAL Soft instead of Apple's buggy OpenAL implementation, so many OSX-specific audio bugs should be fixed as well. Here it is: https://dl.dropbox.com/u/4214717/love-osx.zip

Note that the "nproc" command isn't available in OSX. If you want to get the number of physical cores in OS X, you can use something like this command:

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io.popen("system_profiler SPHardwareDataType | grep -i 'total number of cores'")

It will produce a string like this, which you can parse: " Total Number of Cores: 4"

Or if you don't mind including Intel's hyperthreading in the core count, this should work in OS X:

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io.popen("sysctl -n hw.ncpu")

It produces a string like "8".

To detect the operating system the user is running, you can check the love._os string. It will return "Windows", "Linux", "OS X", or "Unknown".

[Lafolie]

Oh awesome slime, I'll be grabbing that build! I take it these issues are *fixed* in the next official build?

[slime]

Oh awesome slime, I'll be grabbing that build! I take it these issues are *fixed* in the next official build?

If by *fixed* you mean the next LÖVE version will use the same updated/fixed libraries as the 0.8.0 build I just uploaded, then yes.

[bartbes]

Hehe, slime is afraid of me, I see.

[Germanunkol]

It is technically available on OSX, but it doesn't work in the particular build of Lua that 0.8.0 for OSX is packaged with, for whatever reason. If you use a version of LÖVE built with LuaJIT, it should work fine.

EDIT: I just built LÖVE 0.8.0 using a fixed/upgraded version of Lua 5.1. io.popen should work now, and as a bonus it uses OpenAL Soft instead of Apple's buggy OpenAL implementation, so many OSX-specific audio bugs should be fixed as well. Here it is: https://dl.dropbox.com/u/4214717/love-osx.zip

Note that the "nproc" command isn't available in OSX. If you want to get the number of physical cores in OS X, you can use something like this command:

Code: Select all

io.popen("system_profiler SPHardwareDataType | grep -i 'total number of cores'")

It will produce a string like this, which you can parse: " Total Number of Cores: 4"

Or if you don't mind including Intel's hyperthreading in the core count, this should work in OS X:

Code: Select all

io.popen("sysctl -n hw.ncpu")

It produces a string like "8".

To detect the operating system the user is running, you can check the love._os string. It will return "Windows", "Linux", "OS X", or "Unknown".

Thanks!
This is sort of what I was looking for. But this means I can't let users use the offiical build of Löve - and that kinda sucks. Can anyone think of a way to get the CPU count with the normal Löve 0.8.0? If not, I'll have to tell Mac users to download this one...

[slime]

You could use os.execute and save the output of the commands to a file in the LÖVE save directory, then read that back. Something like this:

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os.execute(string.format("%s > \"%s\"", "sysctl -n hw.ncpu", love.filesystem.getSaveDirectory().."/cores.txt"))

if love.filesystem.isFile("cores.txt") then
    local corestxt = love.filesystem.read("cores.txt")
end

[Germanunkol]

Perfect, thank you. os.execute it is...

Just wondering... you could use %q instead of %s to avoid having to escape the quotes, right? Would be a little prettier...