George J Carrette created ZOOKEEPER-4556:
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Summary: function zoo_version_str for determining what
libzookeeper.so was loaded
Key: ZOOKEEPER-4556
URL: https://issues.apache.org/jira/browse/ZOOKEEPER-4556
Project: ZooKeeper
Issue Type: Improvement
Components: c client
Affects Versions: 3.8.0
Reporter: George J Carrette
Fix For: 3.9.0
A function zoo_version_str would be useful for the same reasons that librdkafka
has a rd_kafka_version_st, in short, for when a program has dynamically loaded
libzookeeper_mt.so and wants to verify that it provides the expected api
version that the calling program was compiled against.
It is true that zookeeper-native binary package usually contains the
/usr/include/zookeeper files but that is not always the case and even so
provides a more complex scanning issue than simply calling an api function.
Here is the full source code needed to implement this function.
{code:java}
#define STR1(x) STR2(x)
#define STR2(x) #x
const char *zoo_version_str() {
return STR1(ZOO_MAJOR_VERSION) "." STR1(ZOO_MINOR_VERSION) "."
STR1(ZOO_PATCH_VERSION);
} {code}
This function would also be used by any language using a libffi style solution,
of which there are many. In this case you preprocess the /usr/include/zookeeper
files into an application binary interface (ABI) and then at runtime you must
ensure that your ABI matches the API version for the dynamic library which you
want to consume.
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