Table of Contents

1. Introduction

1.1 Problems With Other cron Systems

1.1.1 vixie-cron
1.1.2 fcron
1.1.3 anacron
1.1.4 dcron

1.2 Requirements
1.3 Design Choices
1.4 vixie-cron Patches

2. Design Notes

2.1 Fundamental Operations
2.2 Programs
2.3 Files

2.3.1 Hierarchy

2.4 Inter-Process Communication

2.4.1 Job Submission Protocol
2.4.2 bcron-exec Protocol

3. Configuration

3.1 Environment Variables

4. Implementation Notes

4.1 Job Scheduler