FREAD (3) | C library functions | Unix Manual Pages



FREAD (3) \| C library functions \| Unix Manual Pages \| :man▋ NAME fread, fwrite - binary stream input/output CONTENTS Library Synopsis Description Return Values See Also Standards LIBRARY .Lb libc SYNOPSIS .In stdio.h size_t `fread "void * restrict ptr" "size_t size" "size_t nmemb" "FILE * restrict stream"` size_t `fwrite "const void * restrict ptr" "size_t size" "size_t nmemb" "FILE * restrict stream"` DESCRIPTION The function `fread` reads nmemb objects, each size bytes long, from the stream pointed to by stream, storing them at the location given by ptr. The function `fwrite` writes nmemb objects, each size bytes long, to the stream pointed to by stream, obtaining them from the location given by ptr. RETURN VALUES The functions `fread` and `fwrite` advance the file position indicator for the stream by the number of bytes read or written. They return the number of objects read or written. If an error occurs, or the end-of-file is reached, the return value is a short object count (or zero). The function `fread` does not distinguish between end-of-file and error, and callers must use feof(3) and ferror(3) to determine which occurred. The function `fwrite` returns a value less than nmemb only if a write error has occurred. SEE ALSO read(2), write(2) STANDARDS

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