1.\" Copyright (c) 2016 The FreeBSD Foundation, Inc. 2.\" 3.\" This documentation was written by 4.\" Konstantin Belousov <kib@FreeBSD.org> under sponsorship 5.\" from the FreeBSD Foundation. 6.\" 7.\" Redistribution and use in source and binary forms, with or without 8.\" modification, are permitted provided that the following conditions 9.\" are met: 10.\" 1. Redistributions of source code must retain the above copyright 11.\" notice, this list of conditions and the following disclaimer. 12.\" 2. Redistributions in binary form must reproduce the above copyright 13.\" notice, this list of conditions and the following disclaimer in the 14.\" documentation and/or other materials provided with the distribution. 15.\" 16.\" THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND 17.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE 20.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26.\" SUCH DAMAGE. 27.\" 28.Dd May 5, 2020 29.Dt THR_SET_NAME 2 30.Os 31.Sh NAME 32.Nm thr_set_name 33.Nd set user-visible thread name 34.Sh LIBRARY 35.Lb libc 36.Sh SYNOPSIS 37.In sys/thr.h 38.Ft int 39.Fn thr_set_name "long id" "const char *name" 40.Sh DESCRIPTION 41The 42.Fn thr_set_name 43system call sets the user-visible name for the thread with the identifier 44.Va id 45in the current process to the NUL-terminated string 46.Va name . 47The name will be silently truncated to fit into a buffer of 48.Dv MAXCOMLEN + 1 49bytes. 50The thread name can be seen in the output of the 51.Xr ps 1 52and 53.Xr top 1 54commands, in the kernel debuggers and kernel tracing facility outputs, 55and in userland debuggers and program core files, as notes. 56.Sh RETURN VALUES 57If successful, 58.Fn thr_set_name 59returns zero; otherwise, \-1 is returned, and 60.Va errno 61is set to indicate the error. 62.Sh ERRORS 63The 64.Fn thr_set_name 65system call may return the following errors: 66.Bl -tag -width Er 67.It Bq Er EFAULT 68The memory pointed to by the 69.Fa name 70argument is not valid. 71.It Bq Er ESRCH 72The thread with the identifier 73.Fa id 74does not exist in the current process. 75.El 76.Sh SEE ALSO 77.Xr ps 1 , 78.Xr _umtx_op 2 , 79.Xr thr_exit 2 , 80.Xr thr_kill 2 , 81.Xr thr_kill2 2 , 82.Xr thr_new 2 , 83.Xr thr_self 2 , 84.Xr pthread_set_name_np 3 , 85.Xr ddb 4 , 86.Xr ktr 9 87.Sh STANDARDS 88The 89.Fn thr_set_name 90system call is non-standard and is used by the 91.Lb libthr . 92.Sh HISTORY 93The 94.Fn thr_set_name 95system call first appeared in 96.Fx 5.2 . 97