Jenkins – get the status of a previous stage build in Jenkins pipeline

The best way is to use post build action in the pipeline script.

Handling Failures
Declarative Pipeline supports robust failure handling by default via its post section which allows declaring a number of different "post conditions" such as: always, unstable, success, failure, and changed. The Pipeline Syntax section provides more detail on how to use the various post conditions.

Jenkinsfile (Declarative Pipeline)

pipeline {
    agent any
    stages {
        stage('Test') {
            steps {
                sh 'make check'
            }
        }
    }
    post {
        always {
            junit '**/target/*.xml'
        }
        failure {
            mail to: team@example.com, subject: 'The Pipeline failed :('
        }
    }
}

The documentation is below https://jenkins.io/doc/book/pipeline/syntax/#post

You need to do a couple of things:

1. Add the prototype to a header file.
2. Write a new source file with the function definitions.
3. In a source file that just wants to use the shared function, you need to add #include "header.h" (replacing header.h with the name of the file from step 1) someplace before you try to call the shared function (normally you put all includes at the top of the source file).
4. Make sure your build compiles the new source file and includes that in the link.

A couple of other comments. It's normal to have foo.h as the header for the foo.c but that is only a style guideline.

When using headers, you want to add include guards to protect against the multiple include issue.