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How To Print To Standard Error In C

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Print To Stderr Python

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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 header file. So a C programmer can check the returned values and can take appropriate action depending on the return value. It is a good practice, to set errno to 0 at the time of initializing a program. A value of 0 indicates that there is no error in the program. errno, perror(). and strerror() The C programming language provides perror() and strerror() functions which can be used to display the text message associated with errno. The perror() function displays the string you pass to it, followed by a colon, a space, and then the textual representation of the current errno value. The strerror() function, which returns a pointer to the textual representation of the current errno value. Let's try to simulate an error condition and try to open a file which does not exist. Here I'm using both the functions to show the usage, but you can use one or more ways of printing your errors. Second important point to note is that you should use stderr file stream to output all the errors. #include #include #include extern int errno ; int main () { FILE * pf; int errnum; pf = fopen ("unexist.txt", "rb"); if (pf == NULL) { errnum = errno; fprintf(stderr, "Value of errno: %d\n", errno); perror("Error printed by perror"); fprintf(stderr, "Error opening file: %s\n", strerror( errnum )); } else { fclose (pf); } return 0; } When the above code is compiled and executed, it produces the following

 

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