Blame sysdeps/openbsd/msg_limits.c

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/* Copyright (C) 1998-99 Martin Baulig
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   This file is part of LibGTop 1.0.
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   Contributed by Martin Baulig <martin@home-of-linux.org>, August 1998.
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   LibGTop is free software; you can redistribute it and/or modify it
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   under the terms of the GNU General Public License as published by
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   the Free Software Foundation; either version 2 of the License,
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   or (at your option) any later version.
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   LibGTop is distributed in the hope that it will be useful, but WITHOUT
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   ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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   FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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   for more details.
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   You should have received a copy of the GNU General Public License
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   along with LibGTop; see the file COPYING. If not, write to the
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   Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
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   Boston, MA 02110-1301, USA.
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*/
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#include <config.h>
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#include <glibtop.h>
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#include <glibtop/error.h>
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#include <glibtop/msg_limits.h>
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#include <glibtop_suid.h>
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/* Define the appropriate macro (if any) to get declaration of `struct
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 * msginfo'.  Needed on, at least, FreeBSD. */
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#if defined (STRUCT_MSGINFO_NEEDS_KERNEL)
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#define KERNEL 1
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#elif defined (STRUCT_MSGINFO_NEEDS__KERNEL)
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#define _KERNEL 1
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#endif
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#include <sys/ipc.h>
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#include <sys/msg.h>
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static const unsigned long _glibtop_sysdeps_msg_limits =
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(1L << GLIBTOP_IPC_MSGMAX) + (1L << GLIBTOP_IPC_MSGMNI) +
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(1L << GLIBTOP_IPC_MSGMNB) + (1L << GLIBTOP_IPC_MSGTQL) +
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(1L << GLIBTOP_IPC_MSGSSZ);
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/* The values in this structure never change at runtime, so we only
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 * read it once during initialization. We have to use the name `_msginfo'
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 * since `msginfo' is already declared external in <sys/msg.h>. */
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static struct msginfo _msginfo;
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/* nlist structure for kernel access */
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static struct nlist nlst [] = {
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	{ "_msginfo" },
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	{ 0 }
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};
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/* Init function. */
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void
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_glibtop_init_msg_limits_p (glibtop *server)
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{
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	if (kvm_nlist (server->machine->kd, nlst) < 0) {
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		glibtop_warn_io_r (server, "kvm_nlist (msg_limits)");
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		return;
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	}
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	if (kvm_read (server->machine->kd, nlst [0].n_value,
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		      &_msginfo, sizeof (_msginfo)) != sizeof (_msginfo)) {
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		glibtop_warn_io_r (server, "kvm_read (msginfo)");
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		return;
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	}
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	server->sysdeps.msg_limits = _glibtop_sysdeps_msg_limits;
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}
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/* Provides information about sysv ipc limits. */
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void
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glibtop_get_msg_limits_p (glibtop *server, glibtop_msg_limits *buf)
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{
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	glibtop_init_p (server, (1L << GLIBTOP_SYSDEPS_MSG_LIMITS), 0);
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	memset (buf, 0, sizeof (glibtop_msg_limits));
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	if (server->sysdeps.msg_limits == 0)
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		return;
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	buf->msgmax = _msginfo.msgmax;
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	buf->msgmni = _msginfo.msgmni;
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	buf->msgmnb = _msginfo.msgmnb;
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	buf->msgtql = _msginfo.msgtql;
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	buf->msgssz = _msginfo.msgtql;
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	buf->flags = _glibtop_sysdeps_msg_limits;
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}