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Linux errno 22 (EINVAL) — Invalid Argument

Warningerrno

About Linux errno 22 (EINVAL)

Linux errno 22 (EINVAL) means an invalid argument was passed to a system call or library function. This guide covers everything you need to know about this topic, including common causes, step-by-step solutions, and answers to frequently asked questions.

Here are the key things to understand: EINVAL — one of the arguments is invalid. Generic error for parameter validation failures. Check man page for valid argument ranges. Common in mount, ioctl, and socket operations. Understanding these fundamentals will help you diagnose and resolve this issue more effectively.

The most common reasons this occurs include: Invalid parameter value (out of range, null, etc.). Incorrect combination of flags. Wrong data type or structure format. Unsupported operation for the file type. Identifying the root cause is the first step toward finding the right solution.

To resolve this, follow these recommended steps: Check the man page for valid argument values. Verify all parameters are within valid ranges. Use strace to see the exact system call and arguments. Check dmesg for kernel-level error details. If these steps do not resolve the issue, consider consulting additional resources or a qualified professional.

This article is part of our Linux Error Codes collection on Error Codes Wiki. We provide comprehensive, up-to-date information to help you find solutions quickly.

Quick Answer

How do I debug EINVAL?

Use strace to see the exact system call: strace -e trace=open,read,write command

Overview

Linux errno 22 (EINVAL) means an invalid argument was passed to a system call or library function.

Key Details

  • EINVAL — one of the arguments is invalid
  • Generic error for parameter validation failures
  • Check man page for valid argument ranges
  • Common in mount, ioctl, and socket operations

Common Causes

  • Invalid parameter value (out of range, null, etc.)
  • Incorrect combination of flags
  • Wrong data type or structure format
  • Unsupported operation for the file type

Steps

  1. 1Check the man page for valid argument values
  2. 2Verify all parameters are within valid ranges
  3. 3Use strace to see the exact system call and arguments
  4. 4Check dmesg for kernel-level error details

Tags

linuxerrnoerrno 22 einvaltroubleshootingfix

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Frequently Asked Questions

Use strace to see the exact system call: strace -e trace=open,read,write command