ferror(3S)                                             ferror(3S)



NAME
     ferror, feof, clearerr, fileno - stream status inquiries

SYNOPSIS
     #include <stdio.h>

     int feof(stream)
     FILE *stream;

     int ferror(stream)
     FILE *stream;

     void clearerr(stream)
     FILE *stream;

     int fileno(stream)
     FILE *stream;

DESCRIPTION
     feof returns nonzero when EOF has previously been detected
     reading the named input stream; otherwise, it returns zero.

     ferror returns nonzero when an I/O error has previously
     occurred reading from or writing to the named stream;
     otherwise, it returns zero.

     clearerr resets the error indicator and EOF indicator to
     zero on the named stream.

     fileno returns the integer file descriptor associated with
     the named stream; see open(2).

NOTES
     All these functions are implemented as macros; they cannot
     be declared or redeclared.

SEE ALSO
     open(2), fopen(3S)

















January 1992                                                    1