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.Dd June 1, 2016
.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
sets the user-visible name for the kernel thread with the identifier
.Va id
in the current process, to the NUL-terminated string
.Va name .
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,
also in userland debuggers and program core files, as notes.
.Sh RETURN VALUES
If successful,
.Fn thr_set_name
will return zero, otherwise \-1 is returned, and
.Va errno
is set to indicate the error.
.Sh ERRORS
The
.Fn thr_set_name
operation 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 ENAMETOOLONG
The string pointed to by the
.Fa name
argument exceeds
.Dv MAXCOMLEN + 1
bytes in length.
.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_new
system call is non-standard and is used by
.Lb libthr .