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we need stdlib.h for the reverse-proxy-ttl handling #322

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Dec 1, 2016
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we need stdlib.h for the reverse-proxy-ttl handling #322

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10 changes: 10 additions & 0 deletions Resources/doc/reference/configuration/headers.rst
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Original file line number Diff line number Diff line change
Expand Up @@ -336,6 +336,10 @@ you need to extend your varnish ``vcl_fetch`` configuration:

.. code-block:: c

C{
#include <stdlib.h>
}C

sub vcl_fetch {
if (beresp.http.X-Reverse-Proxy-TTL) {
C{
Expand All @@ -347,6 +351,12 @@ you need to extend your varnish ``vcl_fetch`` configuration:
}
}

The import for ``stdlib.h`` has to be outside of any ``vcl_X`` sub routines.
Omitting the ``stdlib`` inclusion will result in a compile error complaining
that ``atoi`` is not defined, and including the header file inside a VCL sub
routine leads to a C compile failure mentioning
``invalid storage class for function __bswap_32``.

Note that there is a ``beresp.ttl`` field in VCL but unfortunately it can only
be set to absolute values and not dynamically. Thus we have to revert to a C
code fragment.