ferror(3S)                                             ferror(3S)



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

SYNOPSIS
     #include <stdio.h>

     int ferror (stream)
     FILE *stream;

     int feof (stream)
     FILE *stream;

     void clearerr (stream)
     FILE *stream;

     int fileno (stream)
     FILE *stream;

DESCRIPTION
     ferror returns non-zero when an I/O error has previously
     occurred reading from or writing to the named stream, other-
     wise zero.

     Feof returns non-zero when EOF has previously been detected
     reading the named input stream, otherwise 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).

NOTE
     All these functions are implemented as macros; they cannot
     be declared or redeclared.  If the _OCS macro is defined,
     they are functions in the C library, and not macros.

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
















Page 1                        CX/UX Programmer's Reference Manual