How To Handle Error In C Programming
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Exception Handling In C Sharp
C - Error Handling Advertisements Previous Page Next Page As such, C programming does not provide direct support for error handling but being a system programming language, it provides you access at lower level in the form of return values. Most of the C or even Unix function calls return -1 or NULL in case of any error and set an error code errno. It is set as a global variable and indicates an error occurred during any function call. You can find various error c error codes codes defined in
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C Programming Error Codes
a community of 4.7 million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up Error handling in C code up vote 102 down vote favorite 59 What do https://www.tutorialspoint.com/cprogramming/c_error_handling.htm you consider "best practice" when it comes to error handling errors in a consistent way in a C library. There are two ways I've been thinking of: Always return error code. A typical function would look like this: MYAPI_ERROR getObjectSize(MYAPIHandle h, int* returnedSize); The always provide an error pointer approach: int getObjectSize(MYAPIHandle h, MYAPI_ERROR* returnedError); When using the first approach it's possible to write code like this where the error handling http://stackoverflow.com/questions/385975/error-handling-in-c-code check is directly placed on the function call: int size; if(getObjectSize(h, &size) != MYAPI_SUCCESS) { // Error handling } Which looks better than the error handling code here. MYAPIError error; int size; size = getObjectSize(h, &error); if(error != MYAPI_SUCCESS) { // Error handling } However, I think using the return value for returning data makes the code more readable, It's obvious that something was written to the size variable in the second example. Do you have any ideas on why I should prefer any of those approaches or perhaps mix them or use something else? I'm not a fan of global error states since it tends to make multi threaded use of the library way more painful. EDIT: C++ specific ideas on this would also be interesting to hear about as long as they are not involving exceptions since it's not an option for me at the moment... c error-handling share|improve this question edited Nov 6 '13 at 19:09 ubershmekel 3,65513145 asked Dec 22 '08 at 10:46 Laserallan 6,71172956 add a comment| 17 Answers 17 active oldest votes up vote 50 down vote accepted I like the error as return-value way. If you're designing the api and you want to make use of your library as painless as
Peter Petersen Error handling is an important issue in embedded systems, and it can account for a substantial portion of a project's code. We were faced with this issue during the design of RTFiles, the embedded http://www.on-time.com/ddj0011.htm filesystem component of On Time RTOS-32, our Win32-compatible RTOS for 32-bit x86 targets. The http://www.studytonight.com/c/error-handling-in-c.php core filesystem is portable with a C function API to the application and a device-driver interface below it. Typically, errors can occur in device drivers and must be reported to the application with suitable return codes, so errors must travel through the complete core filesystem. The classic C approach to this problem is return codes. Each function returns a in c value indicating success or failure. However, with a nontrivial function call hierarchy, this approach clutters the code significantly. Every function must check the return code of every function call it makes and take care of errors. In most cases, the function will merely pass any errors back up to its caller. RTFiles has several hundred internal functions and a call hierarchy up to about 15 levels deep, so this approach would have been a handling in c nightmare to maintain. Programming languages such as Ada or C++ address this issue with exceptions. Exceptions make it easy to separate error handling from the rest of the code. Intermediate functions can completely ignore errors occurring in functions they call, if they can't handle them anyway. Exceptions are much easier to maintain than error return codes, so we definitely wanted to use them for RTFiles. Unfortunately, we had to write RTFiles in C, and not C++ or Ada, for portability. RTFiles must support compilers without C++ support. Another issue is overhead and reliability. C++ exception handling needs a lot of run-time system support routines, which might add too much code to a small embedded system. C++ exceptions are objects dynamically allocated from the heap, but many embedded systems do not want to use any dynamic memory allocation to avoid heap fragmentation and out-of-heap-space problems. For example, what would happen if an RTFiles device driver throws a disk-write-protection exception, and the heap allocation called by throw throws an out-of-memory exception? The solution to the problem is to implement a simple exception-handling library in C with the following goals: No dynamic memory allocation. Robust (the exception handling library itself must not fail). Must support both exception-handlers and finally-handlers. Reentrant for multitasking applications. In this article, we describe how we designed and impl
INDEX Basics of C Language Overview of C Features of C My First C program C Input / Output C Syntax Rules Keywords and Identifier Operators in C Language Data Types in C Variables in C Decision Making Switch Statement Looping Arrays string and character array Storage classes Functions in C Introduction to Functions Types of Function calls Passing Array to function Structures in C Introduction to Structures Typedef Unions Pointers in C Pointers concept Declaring and initializing pointer Pointer to Array Pointer to Structure Pointer Arithmetic Pointer with Functions Advanced Topics in C File Input / Output Error Handling Dynamic memory allocation Command line argument C programs Find Factorial of a Number Reverse a String Fibonacci Series Sum of Digits of a Number Sorting an Array element Swapping two Numbers Largest Number of an Array Pallindrome Program Remove Duplicate Element from Array Create and Write in File List all Files in Directory Find Size of a File Copy one File data into Another File Reverse Content of File Error Handling C language does not provide direct support for error handling. However few method and variable defined in error.h header file can be used to point out error using return value of the function call. In C language, a function return -1 or NULL value in case of any error and a global variable errno is set with the error code. So the return value can be used to check error while programming. C language uses the following functions to represent error perror() return string pass to it along with the textual represention of current errno value. strerror() is defined in string.h library. This method returns a pointer to the string representation of the current errno value. Example #include