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+.\" Copyright (c) 2016 The FreeBSD Foundation
+.\"
+.\" This documentation was written by
+.\" Konstantin Belousov <kib@FreeBSD.org> under sponsorship
+.\" from the FreeBSD Foundation.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.Dd May 5, 2020
+.Dt THR_SET_NAME 2
+.Os
+.Sh NAME
+.Nm thr_set_name
+.Nd set user-visible thread name
+.Sh LIBRARY
+.Lb libc
+.Sh SYNOPSIS
+.In sys/thr.h
+.Ft int
+.Fn thr_set_name "long id" "const char *name"
+.Sh DESCRIPTION
+The
+.Fn thr_set_name
+system call sets the user-visible name for the thread with the identifier
+.Va id
+in the current process to the NUL-terminated string
+.Va name .
+The name will be silently truncated to fit into a buffer of
+.Dv MAXCOMLEN + 1
+bytes.
+The thread name can be seen in the output of the
+.Xr ps 1
+and
+.Xr top 1
+commands, in the kernel debuggers and kernel tracing facility outputs,
+and in userland debuggers and program core files, as notes.
+.Sh RETURN VALUES
+If successful,
+.Fn thr_set_name
+returns zero; otherwise, \-1 is returned, and
+.Va errno
+is set to indicate the error.
+.Sh ERRORS
+The
+.Fn thr_set_name
+system call may return the following errors:
+.Bl -tag -width Er
+.It Bq Er EFAULT
+The memory pointed to by the
+.Fa name
+argument is not valid.
+.It Bq Er ESRCH
+The thread with the identifier
+.Fa id
+does not exist in the current process.
+.El
+.Sh SEE ALSO
+.Xr ps 1 ,
+.Xr _umtx_op 2 ,
+.Xr thr_exit 2 ,
+.Xr thr_kill 2 ,
+.Xr thr_kill2 2 ,
+.Xr thr_new 2 ,
+.Xr thr_self 2 ,
+.Xr pthread_set_name_np 3 ,
+.Xr ddb 4 ,
+.Xr ktr 9
+.Sh STANDARDS
+The
+.Fn thr_set_name
+system call is non-standard and is used by the
+.Lb libthr .
+.Sh HISTORY
+The
+.Fn thr_set_name
+system call first appeared in
+.Fx 5.2 .