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FERROR(3)		   Linux Programmer's Manual		     FERROR(3)

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

SYNOPSIS
       #include	<stdio.h>

       void clearerr(FILE *stream);

       int feof(FILE *stream);

       int ferror(FILE *stream);

       int fileno(FILE *stream);

   Feature Test	Macro Requirements for glibc (see feature_test_macros(7)):

       fileno(): _POSIX_C_SOURCE >= 1 || _XOPEN_SOURCE || _POSIX_SOURCE

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	nonzero	if it is set.  The end-of-file
       indicator can be	cleared	only by	the function clearerr().

       The function ferror() tests the error indicator for the stream  pointed
       to  by stream, returning	nonzero	if it is set.  The error indicator can
       be reset	only by	the clearerr() function.

       The function fileno() examines the argument stream and returns its  in-
       teger descriptor.

       For nonlocking counterparts, see	unlocked_stdio(3).

ERRORS
       These  functions	 should	 not fail and do not set the external variable
       errno.  (However, in case fileno() detects that its argument is	not  a
       valid stream, it	must return -1 and set errno to	EBADF.)

ATTRIBUTES
   Multithreading (see pthreads(7))
       The  clearerr(),	 feof(),  ferror(), and	fileno() functions are thread-
       safe.

CONFORMING TO
       The functions clearerr(), feof(), and ferror()  conform	to  C89,  C99,
       POSIX.1-2001, and POSIX.1-2008.

       The function fileno() conforms to POSIX.1-2001 and POSIX.1-2008.

SEE ALSO
       open(2),	fdopen(3), stdio(3), unlocked_stdio(3)

COLOPHON
       This  page  is  part of release 3.74 of the Linux man-pages project.  A
       description of the project, information about reporting bugs,  and  the
       latest	  version     of     this    page,    can    be	   found    at
       http://www.kernel.org/doc/man-pages/.

				  2014-01-15			     FERROR(3)

NAME | SYNOPSIS | DESCRIPTION | ERRORS | ATTRIBUTES | CONFORMING TO | SEE ALSO | COLOPHON

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