9da227510d
Imported with no changes, but not all parts are expected to be functional. The libc nlist functionality is enabled for the purpose of successful linking, although the nlist functionaly has not been tested on MINIX3 nor is it needed for how we use libkvm. In terms of function calls: kvm_getproc2, kvm_getargv2, kvm_getenvv2, and kvm_getlwps are expected to work, whereas kvm_getproc, kvm_getargv, kvm_getenvv, and kvm_getfiles are not. Change-Id: I7539209736f1771fc0b7db5e839d2df72f5ac615
103 lines
3.2 KiB
Groff
103 lines
3.2 KiB
Groff
.\" $NetBSD: kvm_getlwps.3,v 1.6 2009/03/10 23:49:07 joerg Exp $
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.\"
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.\"Copyright (c) 2002 The NetBSD Foundation, Inc.
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.\"All rights reserved.
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.\"
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.\"This code is derived from software contributed to The NetBSD Foundation
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.\"by Nathan J. Williams.
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.\"
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.\"Redistribution and use in source and binary forms, with or without
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.\"modification, are permitted provided that the following conditions
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.\"are met:
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.\"1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\"2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\"
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.\"THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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.\"``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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.\"TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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.\"PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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.\"BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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.\"CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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.\"SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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.\"INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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.\"CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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.\"ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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.\"POSSIBILITY OF SUCH DAMAGE.
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.\"
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.Dd February 10, 2004
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.Dt KVM_GETLWPS 3
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.Os
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.Sh NAME
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.Nm kvm_getlwps
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.Nd access state of LWPs belonging to a user process
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.Sh LIBRARY
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.Lb libkvm
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.Sh SYNOPSIS
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.In kvm.h
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.In sys/param.h
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.In sys/sysctl.h
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.\" .Fa kvm_t *kd
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.Ft struct kinfo_lwp *
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.Fn kvm_getlwps "kvm_t *kd" "int pid" "u_long procaddr" "int *elemsize" "int *cnt"
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.Sh DESCRIPTION
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.Fn kvm_getlwps
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returns the set of LWPs belonging to the process specified by
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.Fa pid
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or
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.Fa procaddr
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in the kernel indicated by
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.Fa kd .
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The number of LWPs found is returned in the reference parameter
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.Fa cnt .
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The LWPs are returned as a contiguous array of
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.Sy kinfo_lwp
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structures.
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This memory is locally allocated, and subsequent calls to
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.Fn kvm_getlwps
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and
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.Fn kvm_close
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will overwrite this storage.
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.Pp
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Only the first
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.Fa elemsize
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bytes of each array entry are returned.
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If the size of the
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.Sy kinfo_lwp
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structure increases in size in a future release of
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.Nx
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the kernel will only return the requested amount of data for
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each array entry and programs that use
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.Fn kvm_getlwps
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will continue to function without the need for recompilation.
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.Pp
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If called against an active kernel, the
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.Fn kvm_getlwps
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function will use the
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.Xr sysctl 3
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interface and return information about the process identified by
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.Fa pid ;
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otherwise the kernel memory device file or swap device will be
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accessed and the process is identified by the location passed in
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.Fa paddr .
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.Sh RETURN VALUES
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.Fn kvm_getlwps
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returns
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.Dv NULL
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on failure.
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.Sh SEE ALSO
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.Xr kvm 3 ,
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.Xr kvm_close 3 ,
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.Xr kvm_geterr 3 ,
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.Xr kvm_getproc2 3 ,
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.Xr kvm_getprocs 3 ,
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.Xr kvm_nlist 3 ,
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.Xr kvm_open 3 ,
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.Xr kvm_openfiles 3 ,
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.Xr kvm_read 3 ,
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.Xr kvm_write 3
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.Sh BUGS
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These routines do not belong in the kvm interface.
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