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.Dd January 23, 2020 33.Dt FPUTS 3 34.Os 35.Sh NAME 36.Nm fputs , 37.Nm fputs_unlocked , 38.Nm puts 39.Nd output a line to a stream 40.Sh LIBRARY 41.Lb libc 42.Sh SYNOPSIS 43.In stdio.h 44.Ft int 45.Fn fputs "const char *str" "FILE *stream" 46.Ft int 47.Fn fputs_unlocked "const char *str" "FILE *stream" 48.Ft int 49.Fn puts "const char *str" 50.Sh DESCRIPTION 51The function 52.Fn fputs 53writes the string pointed to by 54.Fa str 55to the stream pointed to by 56.Fa stream . 57.\" The terminating 58.\" .Dv NUL 59.\" character is not written. 60.Pp 61The 62.Fn fputs_unlocked 63function is equivalent to 64.Fn fputs , 65except that the caller is responsible for locking the stream with 66.Xr flockfile 3 67before calling it. 68This function may be used to avoid the overhead of locking the stream and to 69prevent races when multiple threads are operating on the same stream. 70.Pp 71The function 72.Fn puts 73writes the string 74.Fa str , 75and a terminating newline character, 76to the stream 77.Dv stdout . 78.Sh RETURN VALUES 79The functions 80.Fn fputs 81and 82.Fn puts 83return a nonnegative integer on success and 84.Dv EOF 85on error. 86.Sh ERRORS 87.Bl -tag -width Er 88.It Bq Er EBADF 89The 90.Fa stream 91argument 92is not a writable stream. 93.El 94.Pp 95The functions 96.Fn fputs 97and 98.Fn puts 99may also fail and set 100.Va errno 101for any of the errors specified for the routines 102.Xr write 2 . 103.Sh SEE ALSO 104.Xr ferror 3 , 105.Xr fputws 3 , 106.Xr putc 3 , 107.Xr stdio 3 108.Sh STANDARDS 109The functions 110.Fn fputs 111and 112.Fn puts 113conform to 114.St -isoC . 115