The sandbox libraries (libsandbox & pysandbox) are an open-source suite of software components for C/C++ and Python developers to create automated profiling tools and watchdog programs. The API's are designed for executing and instrumenting simple (single process) tasks, featuring policy-based behavioral auditing, resource quota, and statistics collecting.

The sandbox libraries were originally designed and utilized as the core security module of a full-fledged online judge system for ACM/ICPC training. They have since then evolved into a general-purpose tool for binary program testing, profiling, and security restriction. The sandbox libraries are currently maintained by the OpenJudge Alliance ( as a standalone, open-source project to facilitate various assignment grading solutions for IT/CS education.

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  • capture system calls and arguments invoked by sandboxed binary programs in runtime, and block malicious actions through user-defined policy modules
  • specify quota limit of resources allocated to the sandboxed program, including cpu and wallclock time, memory, and disk output
  • minimize privileges of sandboxed programs, and isolate their execution from critical parts of the operating system

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Additional Project Details

Intended Audience

Developers, Education, Testers, Quality Engineers, Science/Research

User Interface

Console/Terminal, Other toolkit

Programming Language

C, Python