\"      $NetBSD: kvm_getlwps.3,v 1.8 2018/01/09 21:13:59 kamil Exp $
\"
\"Copyright (c) 2002 The NetBSD Foundation, Inc.
\"All rights reserved.
\"
\"This code is derived from software contributed to The NetBSD Foundation
\"by Nathan J. Williams.
\"
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\"modification, are permitted provided that the following conditions
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\"PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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Dd January 9, 2018
Dt KVM_GETLWPS 3
Os
Sh NAME
Nm kvm_getlwps
Nd access state of LWPs belonging to a user process
Sh LIBRARY
Lb libkvm
Sh SYNOPSIS
In kvm.h
In sys/param.h
In sys/sysctl.h
\" .Fa kvm_t *kd
Ft struct kinfo_lwp *
Fn kvm_getlwps "kvm_t *kd" "int pid" "unsigned long procaddr" "size_t elemsize" "int *cnt"
Sh DESCRIPTION
Fn kvm_getlwps
returns the set of LWPs belonging to the process specified by
Fa pid
or
Fa procaddr
in the kernel indicated by
Fa kd .
The number of LWPs found is returned in the reference parameter
Fa cnt .
The LWPs are returned as a contiguous array of
Sy kinfo_lwp
structures.
This memory is locally allocated, and subsequent calls to
Fn kvm_getlwps
and
Fn kvm_close
will overwrite this storage.
Pp
Only the first
Fa elemsize
bytes of each array entry are returned.
If the size of the
Sy kinfo_lwp
structure increases in size in a future release of
Nx
the kernel will only return the requested amount of data for
each array entry and programs that use
Fn kvm_getlwps
will continue to function without the need for recompilation.
Pp
If called against an active kernel, the
Fn kvm_getlwps
function will use the
Xr sysctl 3
interface and return information about the process identified by
Fa pid ;
otherwise the kernel memory device file or swap device will be
accessed and the process is identified by the location passed in
Fa paddr .
Sh RETURN VALUES
Fn kvm_getlwps
returns
Dv NULL
on failure.
Sh SEE ALSO
Xr kvm 3 ,
Xr kvm_close 3 ,
Xr kvm_geterr 3 ,
Xr kvm_getproc2 3 ,
Xr kvm_getprocs 3 ,
Xr kvm_nlist 3 ,
Xr kvm_open 3 ,
Xr kvm_openfiles 3 ,
Xr kvm_read 3 ,
Xr kvm_write 3
Sh BUGS
These routines do not belong in the kvm interface.

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