1.\" Copyright (c) 1990, 1991, 1993 2.\" The Regents of the University of California. All rights reserved. 3.\" 4.\" This code is derived from software contributed to Berkeley by 5.\" Chris Torek and the American National Standards Committee X3, 6.\" on Information Processing Systems. 7.\" 8.\" Redistribution and use in source and binary forms, with or without 9.\" modification, are permitted provided that the following conditions 10.\" are met: 11.\" 1. Redistributions of source code must retain the above copyright 12.\" notice, this list of conditions and the following disclaimer. 13.\" 2. Redistributions in binary form must reproduce the above copyright 14.\" notice, this list of conditions and the following disclaimer in the 15.\" documentation and/or other materials provided with the distribution. 16.\" 3. Neither the name of the University nor the names of its contributors 17.\" may be used to endorse or promote products derived from this software 18.\" without specific prior written permission. 19.\" 20.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 21.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 24.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30.\" SUCH DAMAGE. 31.\" 32.\" @(#)fputs.3 8.1 (Berkeley) 6/4/93 33.\" $FreeBSD: src/lib/libc/stdio/fputs.3,v 1.14 2007/04/19 14:01:04 phk Exp $ 34.\" 35.Dd November 22, 2020 36.Dt FPUTS 3 37.Os 38.Sh NAME 39.Nm fputs , 40.Nm fputs_unlocked , 41.Nm puts 42.Nd output a line to a stream 43.Sh LIBRARY 44.Lb libc 45.Sh SYNOPSIS 46.In stdio.h 47.Ft int 48.Fn fputs "const char * restrict str" "FILE * restrict stream" 49.Ft int 50.Fn fputs_unlocked "const char *str" "FILE *stream" 51.Ft int 52.Fn puts "const char *str" 53.Sh DESCRIPTION 54The function 55.Fn fputs 56writes the string pointed to by 57.Fa str 58to the stream pointed to by 59.Fa stream . 60.\" The terminating 61.\" .Dv NUL 62.\" character is not written. 63.Pp 64The 65.Fn fputs_unlocked 66function is equivalent to 67.Fn fputs , 68except that the caller is responsible for locking the stream with 69.Xr flockfile 3 70before calling it. 71This function may be used to avoid the overhead of locking the stream and to 72prevent races when multiple threads are operating on the same stream. 73.Pp 74The function 75.Fn puts 76writes the string 77.Fa str , 78and a terminating newline character, 79to the stream 80.Dv stdout . 81.Sh RETURN VALUES 82The functions 83.Fn fputs 84and 85.Fn puts 86return a nonnegative integer on success and 87.Dv EOF 88on error. 89.Sh ERRORS 90.Bl -tag -width Er 91.It Bq Er EBADF 92The 93.Fa stream 94argument 95is not a writable stream. 96.El 97.Pp 98The functions 99.Fn fputs 100and 101.Fn puts 102may also fail and set 103.Va errno 104for any of the errors specified for the routines 105.Xr write 2 . 106.Sh SEE ALSO 107.Xr ferror 3 , 108.Xr fputws 3 , 109.Xr putc 3 , 110.Xr stdio 3 111.Sh STANDARDS 112The functions 113.Fn fputs 114and 115.Fn puts 116conform to 117.St -isoC . 118