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NetBSD 6.1.5 - man page for ferror (netbsd section 3)

FERROR(3)			   BSD Library Functions Manual 			FERROR(3)

NAME
     clearerr, feof, ferror, fileno -- check and reset stream status

LIBRARY
     Standard C Library (libc, -lc)

SYNOPSIS
     #include <stdio.h>

     void
     clearerr(FILE *stream);

     int
     feof(FILE *stream);

     int
     ferror(FILE *stream);

     int
     fileno(FILE *stream);

DESCRIPTION
     The function clearerr() clears the end-of-file and error indicators for the stream pointed
     to by stream.

     The function feof() tests the end-of-file indicator for the stream pointed to by stream,
     returning non-zero if it is set.  The end-of-file indicator can only be cleared by the func-
     tion clearerr().

     The function ferror() tests the error indicator for the stream pointed to by stream, return-
     ing non-zero if it is set.  The error indicator can only be reset by the clearerr() func-
     tion.

     The function fileno() examines the argument stream and returns its integer descriptor.

ERRORS
     The functions clearerr(), feof(), and ferror() should neither fail nor set the external
     variable errno.  However, the function fileno() may fail and return -1 in case the argument
     stream is not associated with a valid file descriptor.  (In this case the NetBSD implementa-
     tion does not follow the optional POSIX recommendation to set the errno variable to EBADF.)

SEE ALSO
     open(2), stdio(3)

STANDARDS
     The functions clearerr(), feof(), and ferror() conform to ANSI X3.159-1989 (``ANSI C89'').
     The function fileno() conforms to ISO/IEC 9945-1:1990 (``POSIX.1'').

BSD					   May 6, 2010					      BSD


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