Print Error C
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- Typedef C - Input & Output C - File I/O C - Preprocessors C - Header Files C - Type Casting C - Error Handling C - Recursion C - c stderr Variable Arguments C - Memory Management C - Command Line Arguments C Programming Resources C - Questions & Answers C - Quick Guide C - Useful Resources C - Discussion Selected Reading Developer's Best Practices Questions and Answers Effective Resume Writing HR Interview Questions Computer Glossary Who is Who C - Error Handling Advertisements Previous Page Next Page As such, c programming error codes 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 codes defined in
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helping each other. Join them; it only takes a minute: Sign up Printing error messages up vote 3 down vote favorite 2 I am just wondering what is the best way to make custom print error functions. For https://www.tutorialspoint.com/cprogramming/c_error_handling.htm example I have some #defines like this in header file: #define SOCKET_ERR 0 #define BIND_ERR 1 #define LISTEN_ERR 2 etc Then maybe using this like this: if(/*something has gone wrong with socket*/) { print_error(SOCKET_ERR); } print_error(int error) { if(error == 0) { printf("Socket failure\n"); } } However, I don't think this perfect and want to do something much better. Maybe something a little bit more professional and maybe more scalable. Many thanks for any advice, c share|improve http://stackoverflow.com/questions/1679117/printing-error-messages this question asked Nov 5 '09 at 8:30 ant2009 78686247396 1 Use 'fprintf(stderr, ...)' to report errors (or, at least, normally write to 'stderr' rather than 'stdout' - or write to a log file, or both log file and stderr). –Jonathan Leffler Nov 5 '09 at 8:51 add a comment| 3 Answers 3 active oldest votes up vote 3 down vote accepted You might consider using variadic functions for error reporting, they become so much more versatile. For instance #include
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 https://www.codingunit.com/c-tutorial-error-handling-exception-handling NULL in case of an error, so quick test on 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 error c (for example 1). (With command ‘echo $?’ on the command line you can display the return code of a program that 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. print error c 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 need to include errno.h and you need to call ‘extern int errno;’ Let us take a look at an example: #include