C Programming Tricky Interview Questions | Input Output Mistakes and Useful Concepts 2

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PTHREADS(7) Linux Programmer’s Manual PTHREADS(7) NAME top pthreads – POSIX threads DESCRIPTION top

The system automatically deletes buffers when you close the stream, or when a program ends normally without closing the stream. Return Value. The fflush() function returns the value 0 if it successfully deletes the buffer. It returns EOF if an error occurs. The value of errno can be set to: Value: Meaning; ENOTOPEN: The file.

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fflush example */ #include <stdio.h> char mybuffer[80]; int main() { FILE * pFile; pFile = fopen ( "example.txt" , "r+" ); if (pFile == NULL) perror ( "Error opening file" ); else { fputs ( "test" ,pFile); fflush (pFile); // flushing or repositioning required fgets (mybuffer,80,pFile); puts (mybuffer); fclose (pFile); return 0; } }. Edit & Run.

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May 27, 2013. It's a little hard to say what "can be problems with" (excessive?) use of fflush. All kinds of things can be, or become, problems, depending on your goals and approaches. Probably a better way to look at this is what the intent of fflush is. The first thing to consider is that fflush is defined only on output streams.

A return value of EOF indicates an error. Note If fflush returns EOF, data may have been lost due to a write failure. When setting up a critical error handler,

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For output streams, fflush(). Otherwise, EOF is returned and errno is set to indicate the error. ERRORS top EBADF stream is not an open stream, or is not.

fflush() is not working in Linux. 4 The fflush function sets the error indicator for the stream and returns EOF if a write error occurs, otherwise it returns zero.

The fflush function flushes the stream stream. If the stream was opened in write mode, or it was opened in update mode and the last operation was a write, the.

Jun 26, 2013. otherwise, the behavior is undefined. 3 If stream is a null pointer, the fflush function performs this flushing action on all streams for which the behavior is defined above. Returns 4 The fflush function sets the error indicator for the stream and returns EOF if a write error occurs, otherwise it returns zero.

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