3fec7a0946
2000-02-13 Martin Baulig <martin@home-of-linux.org> * *.c: kvm_nlist () returns -1 on error, but a positive return value does not necessarily mean failure. Fixes #3302 which was reported by Matthias Scheler some time ago.
132 lines
3.5 KiB
C
132 lines
3.5 KiB
C
/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 4 -*- */
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/* $Id$ */
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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., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA.
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*/
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#include <glibtop.h>
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#include <glibtop/error.h>
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#include <glibtop/sem_limits.h>
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#include <glibtop_suid.h>
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#if defined(__bsdi__) && (_BSDI_VERSION < 199700)
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/* Older versions of BSDI don't seem to have this. */
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int
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glibtop_init_sem_limits_p (glibtop *server)
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{
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return 0;
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}
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int
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glibtop_get_sem_limits_p (glibtop *server, glibtop_sem_limits *buf)
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{
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glibtop_init_p (server, (1L << GLIBTOP_SYSDEPS_SEM_LIMITS), 0);
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memset (buf, 0, sizeof (glibtop_sem_limits));
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return 0;
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}
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#else
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/* #define KERNEL to get declaration of `struct seminfo'. */
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#if defined(__FreeBSD__) || defined(__bsdi__)
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#define KERNEL 1
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#else
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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/sem.h>
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static unsigned long _glibtop_sysdeps_sem_limits =
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(1L << GLIBTOP_SEM_LIMITS_SEMMAP) + (1L << GLIBTOP_SEM_LIMITS_SEMMNI) +
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(1L << GLIBTOP_SEM_LIMITS_SEMMNS) + (1L << GLIBTOP_SEM_LIMITS_SEMMNU) +
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(1L << GLIBTOP_SEM_LIMITS_SEMMSL) + (1L << GLIBTOP_SEM_LIMITS_SEMOPM) +
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(1L << GLIBTOP_SEM_LIMITS_SEMUME) + (1L << GLIBTOP_SEM_LIMITS_SEMUSZ) +
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(1L << GLIBTOP_SEM_LIMITS_SEMVMX) + (1L << GLIBTOP_SEM_LIMITS_SEMAEM);
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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 `_seminfo'
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* since `seminfo' is already declared external in <sys/sem.h>. */
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static struct seminfo _seminfo;
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/* nlist structure for kernel access */
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static struct nlist nlst [] = {
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{ "_seminfo" },
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{ 0 }
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};
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/* Init function. */
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int
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glibtop_init_sem_limits_p (glibtop *server)
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{
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if (kvm_nlist (server->_priv->machine.kd, nlst) < 0) {
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glibtop_warn_io_r (server, "kvm_nlist (sem_limits)");
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return -1;
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}
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if (kvm_read (server->_priv->machine.kd, nlst [0].n_value,
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&_seminfo, sizeof (_seminfo)) != sizeof (_seminfo)) {
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glibtop_warn_io_r (server, "kvm_read (seminfo)");
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return -1;
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}
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server->sysdeps.sem_limits = _glibtop_sysdeps_sem_limits;
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return 0;
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}
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/* Provides information about sysv sem limits. */
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int
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glibtop_get_sem_limits_p (glibtop *server, glibtop_sem_limits *buf)
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{
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glibtop_init_p (server, (1L << GLIBTOP_SYSDEPS_SEM_LIMITS), 0);
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memset (buf, 0, sizeof (glibtop_sem_limits));
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if (server->sysdeps.sem_limits == 0)
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return -1;
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buf->semmap = _seminfo.semmap;
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buf->semmni = _seminfo.semmni;
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buf->semmns = _seminfo.semmns;
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buf->semmnu = _seminfo.semmnu;
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buf->semmsl = _seminfo.semmsl;
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buf->semopm = _seminfo.semopm;
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buf->semvmx = _seminfo.semvmx;
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buf->semaem = _seminfo.semaem;
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buf->flags = _glibtop_sysdeps_sem_limits;
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return 0;
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}
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#endif /* either a newer BSDI or no BSDI at all. */
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