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FERROR(3)	       FreeBSD Library Functions Manual		     FERROR(3)

NAME
     clearerr, clearerr_unlocked, feof,	feof_unlocked, ferror,
     ferror_unlocked, fileno, fileno_unlocked -- check and reset stream	status

LIBRARY
     Standard C	Library	(libc, -lc)

SYNOPSIS
     #include <stdio.h>

     void
     clearerr(FILE *stream);

     void
     clearerr_unlocked(FILE *stream);

     int
     feof(FILE *stream);

     int
     feof_unlocked(FILE	*stream);

     int
     ferror(FILE *stream);

     int
     ferror_unlocked(FILE *stream);

     int
     fileno(FILE *stream);

     int
     fileno_unlocked(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 function clearerr().

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

     The function fileno() examines the	argument stream	and returns its	inte-
     ger descriptor.

     The clearerr_unlocked(), feof_unlocked(), ferror_unlocked(), and
     fileno_unlocked() functions are equivalent	to clearerr(), feof(),
     ferror(), and fileno() respectively, except that the caller is responsi-
     ble for locking the stream	with flockfile(3) before calling them.	These
     functions may be used to avoid the	overhead of locking the	stream and to
     prevent races when	multiple threads are operating on the same stream.

ERRORS
     These functions should not	fail and do not	set the	external variable
     errno.

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

STANDARDS
     The functions clearerr(), feof(), and ferror() conform to ISO/IEC
     9899:1990 (``ISO C90'').

FreeBSD	9.2		       January 10, 2003			   FreeBSD 9.2

NAME | LIBRARY | SYNOPSIS | DESCRIPTION | ERRORS | SEE ALSO | STANDARDS

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