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.\" 34.Dd January 23, 2020 35.Dt FPUTS 3 36.Os 37.Sh NAME 38.Nm fputs , 39.Nm fputs_unlocked , 40.Nm puts 41.Nd output a line to a stream 42.Sh LIBRARY 43.Lb libc 44.Sh SYNOPSIS 45.In stdio.h 46.Ft int 47.Fn fputs "const char *str" "FILE *stream" 48.Ft int 49.Fn fputs_unlocked "const char *str" "FILE *stream" 50.Ft int 51.Fn puts "const char *str" 52.Sh DESCRIPTION 53The function 54.Fn fputs 55writes the string pointed to by 56.Fa str 57to the stream pointed to by 58.Fa stream . 59.\" The terminating 60.\" .Dv NUL 61.\" character is not written. 62.Pp 63The 64.Fn fputs_unlocked 65function is equivalent to 66.Fn fputs , 67except that the caller is responsible for locking the stream with 68.Xr flockfile 3 69before calling it. 70This function may be used to avoid the overhead of locking the stream and to 71prevent races when multiple threads are operating on the same stream. 72.Pp 73The function 74.Fn puts 75writes the string 76.Fa str , 77and a terminating newline character, 78to the stream 79.Dv stdout . 80.Sh RETURN VALUES 81The functions 82.Fn fputs 83and 84.Fn puts 85return a nonnegative integer on success and 86.Dv EOF 87on error. 88.Sh ERRORS 89.Bl -tag -width Er 90.It Bq Er EBADF 91The 92.Fa stream 93argument 94is not a writable stream. 95.El 96.Pp 97The functions 98.Fn fputs 99and 100.Fn puts 101may also fail and set 102.Va errno 103for any of the errors specified for the routines 104.Xr write 2 . 105.Sh SEE ALSO 106.Xr ferror 3 , 107.Xr fputws 3 , 108.Xr putc 3 , 109.Xr stdio 3 110.Sh STANDARDS 111The functions 112.Fn fputs 113and 114.Fn puts 115conform to 116.St -isoC . 117