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  FERROR(3S)      (C Programming Language Utilities)     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,
       otherwise 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).

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

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




  Page 1                                                   May 1989