Web Reference: Aug 6, 2025 · What is errno? errno is a global variable defined in the header file that indicates the error that occurred during a function call in C. When a function fails, the errno variable is automatically set to a specific error code, which helps identify the type of error encountered. Dec 22, 2008 · If the only possible errors are programmer errors, don't return an error code, use asserts inside the function. An assertion that validates the inputs clearly communicates what the function expects, while too much error checking can obscure the program logic. Error handling lets you detect and respond to problems in your program, like a file that can't be opened or memory that can't be allocated, so your program doesn't crash or behave unexpectedly. Unlike some languages, C does not have built-in exception handling (like try/catch).
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