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In other libraries, its value may be some other negative number. A Shadowy Encounter Make all the statements true Emacs change window fringes (vertical padding)? Parameter stream Pointer to FILE structure Remarks The ferror routine (implemented both as a function and as a macro) tests for a reading or writing error on the file associated with APPLICATION USAGE None.

Appease Your Google Overlords: Draw the "G" Logo How would you help a snapping turtle cross the road? What is it for codes returned by ferror? This function is intended to be used in a fashion similar to the following example: if (ferror(fp) < 0) { char message[3000]; explain_message_ferror(message, sizeof(message), fp); fprintf(stderr, "%s\n", message); exit(EXIT_FAILURE); } It Why does argv include the program name?

Return Value If the error indicator associated with the stream was set, the function returns a non-zero value else, it returns a zero value. You can't get an error message from it. (At least not portably.) –Mat Mar 18 '13 at 9:49 add a comment| 1 Answer 1 active oldest votes up vote 4 down This symbol is declared in stdio.h. For errno there is the char * strerror(int).

Macro: int EOF This macro is an integer value that is returned by a number of narrow stream functions to indicate an end-of-file condition, or some other error situation. ferror Visual Studio 6.0 Tests for an error on a stream. Thus this rule is 'unenforceable' Permalink Jul 14, 2008 David Svoboda While this rule may be unenforceable in general, I suspect most code that defies enforceability will also violate ERR30-C. If char * strerror(int) is good for that too, then I need a reference for it (I failed to find any indicator for this case).

This symbol is declared in wchar.h. go

The request cannot be fulfilled by the server Next: Error Recovery, Previous: Formatted Input, Up: I/O on Streams [Contents][Index] 12.15 End-Of-File and Errors Many of the functions described message_size The size in bytes of the location in which to store the returned message. Is it OK for graduate students to draft the research proposal for their advisor’s funding application (like NIH’s or NSF’s grant application)?

Any conflict between the requirements described here and the ISOC standard is unintentional. In addition, if an early call to printf() fails, later calls may modify errno, whether they fail or not, so the program cannot rely on being able to detect the root The least the message will contain is the value of strerror(errno), but usually it will do much better, and indicate the underlying cause in more detail. And what about "double-click"?

share|improve this answer answered Mar 18 '13 at 9:50 Joachim Pileborg 211k15141249 add a comment| Your Answer draft saved draft discarded Sign up or log in Sign up using Google The content you requested has been removed. We appreciate your feedback. UNIX is a registered Trademark of The Open Group.

Hardware sources of entropy on an FPGA Developing web applications for long lifespan (20+ years) What is a type system? All standard FILE* function also set errno on error. FUTURE DIRECTIONS None. Function: int feof (FILE *stream) Preliminary: | MT-Safe | AS-Safe | AC-Unsafe lock | See POSIX Safety Concepts.

Run-Time Library Reference Alphabetic Function Reference E Through F E Through F ferror ferror ferror _ecvt _endthread, _endthreadex _eof _exec, _wexec Functions _execl, _wexecl _execle, _wexecle _execlp, _wexeclp _execlpe, _wexeclpe _execv, The least the message will contain is the value of strerror(errnum), but usually it will do much better, and indicate the underlying cause in more detail. Join them; it only takes a minute: Sign up Message text for ferror() return value up vote 1 down vote favorite 1 How can I get the message for error codes Function: int ferror (FILE *stream) Preliminary: | MT-Safe | AS-Safe | AC-Unsafe lock | See POSIX Safety Concepts.

The ferror_unlocked function is equivalent to the ferror function except that it does not implicitly lock the stream. Error Handling (ERR) Skip to end of banner JIRA links Go to start of banner ERR01-C. This message buffer is shared by all libexplain functions which do not supply a buffer in their argument list. Why is the spacesuit design so strange in Sunshine?

The ferror() function shall test the error indicator for the stream pointed to by stream. errnum The error value to be decoded, usually obtained from the errno global variable just before this function is called. Derived from Issue 1 of the SVID. Note: This function is not thread safe, because it shares a return buffer across all threads, and many other functions in this library. explain_message_ferror void explain_message_ferror(char *message, int message_size, FILE

Set errno to zero before calling a library function known to set errno, and check errno only after the function returns a value indicating failure. SEE ALSO clearerr(), feof(), fopen() , the Base Definitions volume of IEEEStd1003.1-2001, CHANGE HISTORY First released in Issue 1. The least the message will contain is the value of strerror(errnum), but usually it will do much better, and indicate the underlying cause in more detail. The feof function returns nonzero if and only if the end-of-file indicator for the stream stream is set.

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/* ferror example: writing error */ #include int main () { FILE * pFile; pFile=fopen("myfile.txt","r"); if (pFile==NULL) perror ("Error opening file"); else { fputc ('x',pFile); if (ferror (pFile)) This means that ferror returns a boolean that tells you if there is an error or not, nothing more. Risk AssessmentChecking errno after multiple calls to library functions can lead to spurious error reporting, possibly resulting in incorrect program operation.RecommendationSeverityLikelihoodRemediation CostPriorityLevelERR01-CLowProbableLowP6L2Automated DetectionToolVersionCheckerDescriptionECLAIR1.2CC2.ERR01Fully implementedLDRA tool suite9.5.644 SEnhanced EnforcementRelated VulnerabilitiesSearch for vulnerabilities Returns: The message explaining the error.

POSIX is a registered Trademark of The IEEE. [ Main Index | XBD | XCU | XSH | XRAT ] Developer Network Developer Network Developer Sign in MSDN subscriptions Changing to 'rose-possible'. Note: This function is not thread safe, because it shares a return buffer across all threads, and many other functions in this library. explain_errno_ferror const char *explain_errno_ferror(int errnum, FILE *fp); This symbol is declared in stdio.h.

For example, all of the functions that perform output to a stream—such as fputc, printf, and fflush—are implemented in terms of write, and all of the errno error conditions defined for Next: Error Recovery, Previous: Formatted Input, Up: I/O on Streams [Contents][Index] This function is intended to be used in a fashion similar to the following example: if (ferror(fp) < 0) { fprintf(stderr, "%s\n", explain_ferror(fp)); exit(EXIT_FAILURE); } It is essential that this function With the GNU C Library, EOF is -1.

Compliant SolutionThis compliant solution uses ferror() to detect an error. int ferror( FILE *stream ); Function Required Header Compatibility ferror ANSI, Win 95, Win NT For additional compatibility information, see Compatibility in the Introduction. The errno global variable will be used to obtain the error value to be decoded. Let us compile and run the above program that will produce the following result because we try to read a file which we opened in write only mode.

Returns: The message explaining the error. Removing elements from an array that are in another array Can two integer polynomials touch in an irrational point? This function is intended to be used in a fashion similar to the following example: if (ferror(fp) < 0) { int err = errno; fprintf(stderr, "%s\n", explain_errno_ferror(err, fp)); exit(EXIT_FAILURE); } It These functions check indicators that are part of the internal state of the stream object, indicators set if the appropriate condition was detected by a previous I/O operation on that stream.

End of informative text. If a suitable message return buffer is supplied, this function is thread safe. The ferror() function tests the error indicator for a specified stream and returns nonzero if and only if the error indicator is set for the stream.Noncompliant Code ExampleMany implementations of the