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.\" Copyright (c) 2016 The FreeBSD Foundation, Inc.
.\" All rights reserved.
.\"
.\" 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.
.\"
.\" $FreeBSD$
.\"
.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 thr_exit 2 ,
.Xr thr_kill 2 ,
.Xr thr_kill2 2 ,
.Xr thr_new 2 ,
.Xr thr_self 2 ,
.Xr _umtx_op 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 .