Date: Mon, 3 Jul 2000 13:15:25 +0300 (IDT)
From: Eli Zaretskii <eliz AT is DOT elta DOT co DOT il>
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To: Olaf van der Spek <Olaf AT XCC DOT TMFWeb DOT NL>
cc: djgpp AT delorie DOT com
Subject: Re: Pipe to sendmail (like Perl)
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On Mon, 3 Jul 2000, Olaf van der Spek wrote:

> I tried this:
> 
> #include <cstdio>
> 
> int main()
> {
>  FILE* mail = popen("/usr/sbin/sendmail", "wt");
>  cout << mail << endl;
>  return 0;
> }
> 
> But the output is:
> (nil)

I'm not a C++ expert, but IIRC you cannot use cout in conjunction with a 
FILE object.  Checking whether mail is a NULL pointer might shed some 
light on what's going on.

In any case, what do you expect sendmail to produce when you pass it an 
empty line?