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/dev/zero mmap apache

This is an ancient post with no relevance to modern systems.

From: Bela Lubkin <belal@sco.com>
Subject: Re: Looking for Apache on SCO Unix 3.2v4.2
Date: Thu, 14 Nov 2002 08:43:51 GMT
References: <aqe2km$8u138$1@ID-37340.news.dfncis.de>
<aqe632$j3s$1@pcls4.std.com>
<aqfr0l$9mek8$1@ID-37340.news.dfncis.de>
<3DCBB074.2040803@strhold.it> 

Siegfried Kurz wrote:

> The error_log says:
> open: No such file or directory
> httpd: Could not open /dev/zero

Roberto Zini wrote:

> According to the OS5 docs, /dev/zero is a source of an unlimited stream 
> of zero-valued bytes.
> 
> I don't have a 3.2v4.2 machine around but check if you have 
> /dev/byte/hex/00; if you do, then you can link it to /dev/zero.
> 
> Alternatively, you __MIGHT__ try by linking /dev/null to /dev/zero but 
> I'm not sure about that (do it at your own risk).
> 
> Last, you could write a simple shell/C program which opens a named pipe 
> (eg, /dev/zero) and fills it with an unlimited stream of zero bytes, 
> thus satisfying Apache's needs.

The next error message will probably be something like:

  mmap: invalid system call

The most likely reason for it to be opening /dev/zero is that it wants
to create some anonymous writable memory.  3.2v4.2 doesn't support
mmap() at all...

As Jonathan Schilling suggested, Siegfried is going to have to fiddle
with Apache's build configuration.  There is probably a `configure`
script.  It fools around a bunch and figures out what system calls are
supported -- by the running OS, which is the 5.0.x he's building on.  He
needs to figure out how to override `configure` so that it knows that
mmap() is _not_ supported (and likely half a dozen other calls as well).

Apache is a large and complex beast.  It's probably possible to get it
working (to some degree) on 3.2v4.2, but it will take someone with a lot
of knowledge of Apache _and_ OpenServer release differences.  (Or,
possibly, someone with a 3.2v4.2 development system.)

>Bela<
 

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