C Error Handling Best Practices
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C Exception Handling Best Practices
Overflow the company Business Learn more about hiring developers or posting ads with us c error handling techniques Stack Overflow Questions Jobs Documentation Tags Users Badges Ask Question x Dismiss Join the Stack Overflow Community Stack Overflow is a wcf exception handling best practices 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 you
Exception Handling Best Practices Java
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 check
Error Handling Functions In C
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 3,61513144 asked Dec 22 '08 at 10:46 Laserallan 6,70172956 add a comment| 17 Answers 17 active oldest votes up vote 49 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 possible think
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Error Handling In C++
about hiring developers or posting ads with us Programmers Questions Tags Users Badges Unanswered Ask Question _ Programmers Stack error.h c Exchange is a question and answer site for professional programmers interested in conceptual questions about software development. Join them; it only takes a minute: Sign up Here's how it works: Anybody http://stackoverflow.com/questions/385975/error-handling-in-c-code can ask a question Anybody can answer The best answers are voted up and rise to the top The modern way to perform error handling… up vote 104 down vote favorite 31 I've been pondering this problem for a while now and find myself continually finding caveats and contradictions, so I'm hoping someone can produce a conclusion to the following: Favour exceptions over error http://programmers.stackexchange.com/questions/147059/the-modern-way-to-perform-error-handling codes As far as I'm aware, from working in the industry for four years, reading books and blogs, etc. the current best practice for handling errors is to throw exceptions, rather than returning error codes (not necessarily an error code, but a type representing an error). But - to me this seems to contradict... Coding to interfaces, not implementations We code to interfaces or abstractions to reduce coupling. We don't know, or want to know, the specific type and implementation of an interface. So how can we possibly know what exceptions we should be looking to catch? The implementation could throw 10 different exceptions, or it could throw none. When we catch an exception surely we're making assumptions about the implementation? Unless - the interface has... Exception specifications Some languages allow developers to state that certain methods throw certain exceptions (Java for example, uses the throws keyword.) From the calling code's point of view this seems fine - we know explicitly which exceptions we might need to catch. But - this seems to suggest a... Leaky abstraction Why should an interface specify which exceptions can be thrown? Wha
there are ways to do error handling. Of course the programmer needs to prevent errors during coding and should always test the return values of functions called by the program. A lot of C function calls return a -1 or NULL in case of an error, so quick test on https://www.codingunit.com/c-tutorial-error-handling-exception-handling these return values are easily done with for instance an ‘if statement’. In previous tutorials we already mention that this behavior (returning numbers to indicate an error) is also used in Unix or Linux like operating systems. For instance if a program successful ends the return value of the program is zero. If the program ends with an error usually a number larger than zero is returned (for example 1). (With command ‘echo $?’ on the command line you can display the return code of a program that error handling has previously run). So the one thing you need to remember is that you (the programmer) are responsible for error handling. You’re the person that needs to make sure that a program will gracefully terminate and not just CRASH unexpectedly! It is you that need to take appropriate action depending on the return values of function calls. Global Variable errno The global variable errno is used by C functions and this integer is set if there is an error during the function call. To make use of errno you handling best practices need to include errno.h and you need to call ‘extern int errno;’ Let us take a look at an example: #include
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