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+.\"
+.\" This file and its contents are supplied under the terms of the
+.\" Common Development and Distribution License ("CDDL"), version 1.0.
+.\" You may only use this file in accordance with the terms of version
+.\" 1.0 of the CDDL.
+.\"
+.\" A full copy of the text of the CDDL should have accompanied this
+.\" source.  A copy of the CDDL is also available via the Internet at
+.\" http://www.illumos.org/license/CDDL.
+.\"
+.\"
+.\" Copyright 2021 Oxide Computer Company
+.\"
+.Dd October 3, 2021
+.Dt PROC_GET_LWPSINFO 3PROC
+.Os
+.Sh NAME
+.Nm proc_get_lwpsinfo
+.Nd get thread ps information
+.Sh SYNOPSIS
+.Lb libproc
+.In libproc
+.Ft int
+.Fo proc_get_lwpsinfo
+.Fa "pid_t pid"
+.Fa "uint_t thr"
+.Fa "lwpsinfo_t *lwp"
+.Fc
+.Sh DESCRIPTION
+The
+.Fn proc_get_lwpsinfo
+function is a convenient way to read the /proc lwpsinfo for the specific
+thread,
+.Fa thr ,
+found in the process
+.Fa pid .
+The information from the
+.Pa lwpsinfo
+file will be placed in
+.Fa lwp .
+The definition of the
+.Vt lwpsinfo_t
+structure may be found in
+.Xr proc 4 .
+.Pp
+The thread identifier for a thread is the same between POSIX pthreads,
+C11 threads, and the native threads API.
+It is safe to pass one of those identifiers in as
+.Fa thr
+or to use a specific number.
+.Sh RETURN VALUES
+Upon successful completion, the
+.Fn proc_get_psinfo
+function returns
+.Sy 0 .
+Otherwise,
+.Sy -1
+is returned to indicate an error occurred.
+.Sh INTERFACE STABILITY
+.Sy Uncommitted
+.Sh MT-LEVEL
+.Sy MT-Safe
+.Sh SEE ALSO
+.Xr libproc 3LIB ,
+.Xr proc 4