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.\" Konstantin Belousov <kib@FreeBSD.org> under sponsorship
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.Dd May 5, 2020
.Dt THR_SET_NAME 2
.Nd set user-visible thread name
.Fn thr_set_name "long id" "const char *name"
system call sets the user-visible name for the thread with the identifier
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
The thread name can be seen in the output of the
.Xr ps 1
.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
returns zero; otherwise, \-1 is returned, and
is set to indicate the error.
system call may return the following errors:
.Bl -tag -width Er
.It Bq Er EFAULT
The memory pointed to by the
argument is not valid.
.It Bq Er ESRCH
The thread with the identifier
does not exist in the current process.
.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
system call is non-standard and is used by the
.Lb libthr .
system call first appeared in
.Fx 5.2 .