How To Print To Standard Error In C
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Print To Stderr Python
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Print To Stderr Shell
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Strerror In C
Error checking fprintf when printing to stderr up vote 8 down vote favorite 3 According to the docs, fprintf can fail and will return a negative number on failure. There are clearly many situations where it would be useful to check this http://forum.codecall.net/topic/61791-writing-to-stderr-in-c/ value. However, I usually use fprintf to print error messages to stderr. My code will usually look something like this: rc = foo(); if(rc) { fprintf(stderr, "An error occured\n"); //Sometimes stuff will need to be cleaned up here return 1; } In these cases, is it still possible for fprintf to fail? If so, is there anything that can be done to display the error message somehow or is there is a more reliable alternative to fprintf? If not, is there any need to http://stackoverflow.com/questions/4846562/error-checking-fprintf-when-printing-to-stderr check fprintf when it is used in this way? c share|improve this question asked Jan 31 '11 at 0:18 Rupert Madden-Abbott 5,988104055 add a comment| 5 Answers 5 active oldest votes up vote 11 down vote accepted The C standard says that the file streams stdin, stdout, and stderr shall be connected somewhere, but they don't specify where, of course. It is perfectly feasible to run a program with them redirected: some_program_of_yours >/dev/null 2>&1 &- 2>&- &- 2>&-; echo $? 2 $ (Tested RHEL Linux.) There really isn't a need for it to do more. On the other hand, if your program is supposed to run in the background and write
C - Basic Syntax C - Data Types C - Variables C - Constants C - Storage Classes C - Operators C - Decision Making C - Loops C - Functions C - Scope Rules C - Arrays C - Pointers C - Strings C - Structures C https://www.tutorialspoint.com/cprogramming/c_error_handling.htm - Unions C - Bit Fields C - Typedef C - Input & Output C - File I/O C - Preprocessors C - Header Files C - Type Casting C - Error Handling C - Recursion C - 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 print to is Who 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 print to stderr find various error codes defined in