ultrix man page for clearerr

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)