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strace-ltrace

Trace system calls and library calls to diagnose binary behavior.

159|20|Updated Feb 20, 2026
Search Tags:#debugging#troubleshooting#syscalls#strace#ltrace#system calls#library calls
One-click install
npx skills add https://github.com/mohitmishra786/low-level-dev-skills --skill strace-ltrace
Or copy as Structured Prompt for Agent▼
Please help me install this Agent Skill.
Skill: strace-ltrace
Source: https://github.com/mohitmishra786/low-level-dev-skills/tree/main/skills/profilers/strace-ltrace
Command: npx skills add https://github.com/mohitmishra786/low-level-dev-skills --skill strace-ltrace

SYSTEM DOCUMENTATION & REQUIREMENTS

💡 This Skill includes scripts (resource) and references (resource) components.

What problem does it solve?

This Skill helps diagnose unexpected binary behavior by tracing system calls and library function calls, pinpointing issues like file access errors, permission problems, or network failures without needing a full debugger.

Core Features & Use Cases

  • System Call Tracing: Monitor interactions between a program and the operating system kernel using strace.
  • Library Call Tracing: Intercept calls made to shared libraries using ltrace.
  • Error Interpretation: Understand common system error codes like ENOENT (No such file or directory) and EPERM (Operation not permitted).
  • Use Case: When a program fails with a cryptic error or behaves erratically, use strace to see exactly which file it tried to open and failed, or which network connection it attempted.

Quick Start

Use strace to trace all system calls made by the command './myapp arg1 arg2'.

Frequently Asked Questions about strace-ltrace

High-intent search queries and answers about installing and using this skill.

FAQPage Schema
How do I trace system calls to diagnose why my binary fails to open a file?▼

You can trace system calls using strace to monitor program interactions with the OS kernel, pinpointing exact file access failures. This Skill helps identify issues like missing files or permission errors without needing a full debugger.

What is the difference between tracing system calls and tracing library calls?▼

Tracing system calls with strace monitors kernel interactions, while tracing library calls with ltrace intercepts user-space shared library functions. This Skill provides guidance on interpreting output from both methods to diagnose binary behavior.

How do I interpret common error codes like ENOENT when troubleshooting program behavior?▼

Interpreting error codes like ENOENT (No such file or directory) or EPERM (Operation not permitted) reveals specific system call failures. This Skill helps you understand these codes to identify file access, permission, or network problems.

Can I trace network problems without attaching a full debugger to my application?▼

Yes, you can trace network problems by monitoring system calls to see which network connections a program attempts. This Skill diagnoses erratic behavior by analyzing OS kernel interactions and filtering relevant output.

When should I use strace instead of a traditional debugger for troubleshooting?▼

Use strace instead of a traditional debugger when a program fails with cryptic errors and you need to see kernel-level interactions. This Skill traces system calls to pinpoint file access or network failures without full debugging overhead.

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