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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/shm_limits.h>
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#include <glibtop_suid.h>
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#include <sys/ipc.h>
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#include <sys/shm.h>
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static unsigned long _glibtop_sysdeps_shm_limits =
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(1L << GLIBTOP_IPC_SHMMAX) + (1L << GLIBTOP_IPC_SHMMIN) +
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(1L << GLIBTOP_IPC_SHMMNI) + (1L << GLIBTOP_IPC_SHMSEG) +
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(1L << GLIBTOP_IPC_SHMALL);
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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 `_shminfo'
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* since `shminfo' is already declared external in <sys/shm.h>. */
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static struct shminfo _shminfo;
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/* nlist structure for kernel access */
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static struct nlist nlst [] = {
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{ "_shminfo" },
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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_shm_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 (shm_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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&_shminfo, sizeof (_shminfo)) != sizeof (_shminfo)) {
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glibtop_warn_io_r (server, "kvm_read (shminfo)");
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return;
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}
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server->sysdeps.shm_limits = _glibtop_sysdeps_shm_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_shm_limits_p (glibtop *server, glibtop_shm_limits *buf)
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{
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glibtop_init_p (server, (1L << GLIBTOP_SYSDEPS_SHM_LIMITS), 0);
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memset (buf, 0, sizeof (glibtop_shm_limits));
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if (server->sysdeps.shm_limits == 0)
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return;
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buf->shmmax = _shminfo.shmmax;
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buf->shmmin = _shminfo.shmmin;
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buf->shmmni = _shminfo.shmmni;
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buf->shmseg = _shminfo.shmseg;
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buf->shmall = _shminfo.shmall;
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buf->flags = _glibtop_sysdeps_shm_limits;
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}
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