New Relic C SDK

This is the New Relic C SDK! If your application does not use other New Relic APM agent languages, you can use the C SDK to take advantage of New Relic's monitoring capabilities and features to instrument a wide range of applications.

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We'd love to get your contributions to improve the C SDK! Keep in mind when you submit your pull request, you'll need to sign the CLA via the click-through using CLA-Assistant. If you'd like to execute our corporate CLA, or if you have any questions, please drop us an email at


The C SDK works on 64-bit Linux operating systems with:

  • gcc 4.8 or higher
  • glibc 2.17 or higher
  • Kernel version 2.6.26 or higher
  • libpcre 8.20 or higher
  • libpthread

Running unit tests requires cmake 2.8 or higher.

Compiling the New Relic daemon requires Go 1.7 or higher.

Building the C SDK

If your system meets the requirements, building the C SDK and daemon should be as simple as:


This will create two files in this directory:

  • libnewrelic.a: the static C SDK library, ready to link against.
  • newrelic-daemon: the daemon binary, ready to run.

You can start the daemon in the foreground with:

./newrelic-daemon -f --logfile stdout --loglevel debug

Then you can invoke your instrumented application. Your application, which makes C SDK API calls, reports data to the daemon over a socket; in turn, the daemon reports the data to New Relic.


To compile and run the unit tests:

make run_tests

Or, just to compile them:

make tests


The New Relic C SDK is licensed under the Apache 2.0 License

The C SDK also uses source code from third party libraries. Full details on which libraries are used and the terms under which they are licensed can be found in the third party notices document.