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

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

       #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

       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()

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

       For nonlocking counterparts, see unlocked_stdio(3).

       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.)

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

       The functions clearerr(), feof(), and ferror() conform to C89 and C99.

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

       This page is part of release 3.53 of the Linux man-pages project.  A  description  of  the
       project,     and    information	  about    reporting	bugs,	 can	be    found    at

					    2013-06-21					FERROR(3)
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