[dpdk-dev] [PATCH 2/2] eal: resolve getentropy at run time for random seed

Stephen Hemminger stephen at networkplumber.org
Tue Apr 21 23:03:10 CEST 2020


On Tue, 21 Apr 2020 16:54:45 -0300
Dan Gora <dg at adax.com> wrote:

> The getentropy() function was introduced into glibc v2.25 and so is
> not available on all supported platforms.  Previously, if DPDK was
> compiled (using meson) on a system which has getentropy(), it would
> introduce a dependency on glibc v2.25 which would prevent that binary
> from running on a system with an older glibc.  Similarly if DPDK was
> compiled on a system which did not have getentropy(), getentropy()
> could not be used even if the execution system supported it.
> 
> Introduce a new static function, __rte_getentropy() which will try to
> resolve the getentropy() function dynamically using dlopen()/dlsym(),
> returning failure if the getentropy() function cannot be resolved or
> if it fails.
> 
> This also allows getentropy() to be used as the random seed source
> when the traditional Makefile build for DPDK is used.
> 
> Signed-off-by: Dan Gora <dg at adax.com>

I don't think DPDK has a requirement that building on newer glibc
has to work when run on older version. Glibc doesn't support it.


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