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/* Copyright (C) 1998-99 Martin Baulig
This file is part of LibGTop 1.0.
Contributed by Martin Baulig <martin@home-of-linux.org>, August 1998.
LibGTop is free software; you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License,
or (at your option) any later version.
LibGTop is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
for more details.
You should have received a copy of the GNU General Public License
along with LibGTop; see the file COPYING. If not, write to the
Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
Boston, MA 02110-1301, USA.
*/
#include <config.h>
#include <glibtop.h>
#include <glibtop/error.h>
#include <glibtop/shm_limits.h>
#include <glibtop_suid.h>
#include <sys/ipc.h>
#include <sys/shm.h>
static unsigned long _glibtop_sysdeps_shm_limits =
(1L << GLIBTOP_IPC_SHMMAX) + (1L << GLIBTOP_IPC_SHMMIN) +
(1L << GLIBTOP_IPC_SHMMNI) + (1L << GLIBTOP_IPC_SHMSEG) +
(1L << GLIBTOP_IPC_SHMALL);
/* The values in this structure never change at runtime, so we only
* read it once during initialization. We have to use the name `_shminfo'
* since `shminfo' is already declared external in <sys/shm.h>. */
static struct shminfo _shminfo;
/* Init function. */
void
_glibtop_init_shm_limits_p (glibtop *server)
{
int mib[3];
struct shm_sysctl_info *shmsi;
size_t len = sizeof(struct shminfo);
mib[0] = CTL_KERN;
mib[1] = KERN_SYSVIPC_INFO;
mib[2] = KERN_SYSVIPC_SHM_INFO;
if ((shmsi = malloc(len)) == NULL) {
glibtop_warn_io_r (server, "malloc (shm_limits)");
return;
}
if (sysctl(mib, 3, shmsi, &len, NULL, 0) < 0) {
glibtop_warn_io_r (server, "sysctl (shm_limits)");
return;
}
_shminfo = shmsi->shminfo;
free (shmsi);
server->sysdeps.shm_limits = _glibtop_sysdeps_shm_limits;
}
/* Provides information about sysv ipc limits. */
void
glibtop_get_shm_limits_p (glibtop *server, glibtop_shm_limits *buf)
{
glibtop_init_p (server, (1L << GLIBTOP_SYSDEPS_SHM_LIMITS), 0);
memset (buf, 0, sizeof (glibtop_shm_limits));
if (server->sysdeps.shm_limits == 0)
return;
buf->shmmax = _shminfo.shmmax;
buf->shmmin = _shminfo.shmmin;
buf->shmmni = _shminfo.shmmni;
buf->shmseg = _shminfo.shmseg;
buf->shmall = _shminfo.shmall;
buf->flags = _glibtop_sysdeps_shm_limits;
}
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