1.\" 2.\" 3.\" The contents of this file are subject to the terms of the 4.\" Common Development and Distribution License (the "License"). 5.\" You may not use this file except in compliance with the License. 6.\" 7.\" You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 8.\" or http://www.opensolaris.org/os/licensing. 9.\" See the License for the specific language governing permissions 10.\" and limitations under the License. 11.\" 12.\" When distributing Covered Code, include this CDDL HEADER in each 13.\" file and include the License file at usr/src/OPENSOLARIS.LICENSE. 14.\" If applicable, add the following below this CDDL HEADER, with the 15.\" fields enclosed by brackets "[]" replaced with your own identifying 16.\" information: Portions Copyright [yyyy] [name of copyright owner] 17.\" 18.\" Copyright 1989 AT&T 19.\" Copyright (c) 2005, Sun Microsystems, Inc. All Rights Reserved 20.\" Copyright 2020 Robert Mustacchi 21.\" 22.Dd "March 25, 2020" 23.Dt FERROR 3C 24.Os 25.Sh NAME 26.Nm ferror , 27.Nm feof , 28.Nm clearerr , 29.Nm fileno 30.Nd stream status inquiries 31.Sh SYNOPSIS 32.In stdio.h 33.Ft int 34.Fo ferror 35.Fa "FILE *stream" 36.Fc 37.Ft int 38.Fo feof 39.Fa "FILE *stream" 40.Fc 41.Ft void 42.Fo clearerr 43.Fa "FILE *stream" 44.Fc 45.Ft int 46.Fo fileno 47.Fa "FILE *stream" 48.Fc 49.Sh DESCRIPTION 50The 51.Fn ferror 52function returns a non-zero value when an error has 53previously occurred reading from or writing to the named 54.Fa stream 55.Po 56see 57.Xr Intro 3 58.Pc . 59It returns 60.Sy 0 61otherwise. 62.Pp 63The 64.Fn feof 65function returns a non-zero value when 66.Sy EOF 67has previously been detected reading the named input 68.Fa stream . 69It returns 70.Sy 0 71otherwise. 72.Pp 73The 74.Fn clearerr 75function resets the error indicator and 76.Sy EOF 77indicator to 0 on the named 78.Fa stream . 79.Pp 80The 81.Fn fileno 82function returns the integer file descriptor associated with 83the named 84.Fa stream ; 85see 86.Xr open 2 . 87Streams that are not associated with a file descriptor such as those 88that were created through the 89.Xr fmemopen 3C 90or 91.Xr open_memstream 3C 92functions will return 93.Sy -1 . 94.Sh INTERFACE STABILITY 95.Sy Standard 96.Sh MT-LEVEL 97.Sy MT-Safe 98.Sh SEE ALSO 99.Xr Intro 2 , 100.Xr open 2 , 101.Xr fmemopen 3C , 102.Xr fopen 3C , 103.Xr open_memstream 3C , 104.Xr stdio 3C 105