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Re: popen with r+

Subject: Re: popen with r+
From: Ian Lister <email@hidden>
Date: Wed, 21 Jun 2006 09:10:45 +1000 (EST)
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On Tue, 20 Jun 2006, matt jaffa wrote:

So I was very sad to learn that popen with r+ doesn't work on jaguar
and panther,


Really?

I tried looking at popen's source and doing the pipes and forks like
it does it but fdopen keeps returning EINVAL (22) not liking the "r+"
mode I send it. Here is my ldpopen method:

You can't open pdes[0] for writing, nor pdes[1] for reading. pipe() gives you a single, unidirectional pipe. If you need both input and output from your subprocess you'll need either two pipes or a bidirectional socket (see socketpair(2)).

Ian
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References:
	>popen with r+ (From: "matt jaffa" <email@hidden>)

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