ferror(3s) ferror(3s) Name ferror, feof, clearerr, fileno - stream status inquiries Syntax #include <stdio.h> feof(stream) FILE *stream; ferror(stream) FILE *stream void clearerr(stream) FILE *stream fileno(stream) FILE *stream; Description The function returns nonzero when an error has occurred reading or writing the named stream, otherwise zero. Unless cleared by the error indication lasts until the stream is closed. The function returns nonzero when end of file is read on the named input stream, otherwise zero. The function resets both the error and EOF indicators on the named stream. The function returns the integer file descriptor associated with the stream, see These functions are implemented as macros; they cannot be redeclared. See Also open(2), fopen(3s) ferror(3s)