/* Copyright (C) 1998 Joshua Sled

   This file is part of LibGTop 1.0.

   Contributed by Joshua Sled <jsled@xcf.berkeley.edu>, July 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/procmem.h>

#include <glibtop_suid.h>

#include <kvm.h>

#include <sys/param.h>

#include <sys/proc.h>

#include <sys/resource.h>

#include <vm/vm_object.h>

#include <vm/vm_map.h>

#include <sys/vnode.h>

#include <ufs/ufs/quota.h>

#include <ufs/ufs/inode.h>

#include <sys/ucred.h>

#include <sys/user.h>

#include <sys/sysctl.h>

#include <vm/vm.h>

static const unsigned long _glibtop_sysdeps_proc_mem =

(1L << GLIBTOP_PROC_MEM_SIZE) +

(1L << GLIBTOP_PROC_MEM_VSIZE) +

(1L << GLIBTOP_PROC_MEM_RESIDENT) +

(1L << GLIBTOP_PROC_MEM_RSS) +

(1L << GLIBTOP_PROC_MEM_RSS_RLIM);

static const unsigned long _glibtop_sysdeps_proc_mem_share =

(1L << GLIBTOP_PROC_MEM_SHARE);

/* define pagetok in terms of pageshift */

#define ps_pgtok(a)     (((a) * getpagesize()) / 1024)

/* Init function. */

void

_glibtop_init_proc_mem_p (glibtop *server)

{

	server->sysdeps.proc_mem = _glibtop_sysdeps_proc_mem;

}

/* Provides detailed information about a process. */

void

glibtop_get_proc_mem_p (glibtop *server, glibtop_proc_mem *buf,

			pid_t pid)

{

	struct kinfo_proc *pinfo;

	struct vm_map_entry entry, *first;

	struct vmspace vmspace;

	struct vm_object object;

	int count;

	memset (buf, 0, sizeof (glibtop_proc_mem));

	if (server->sysdeps.proc_mem == 0)

		return;

	/* It does not work for the swapper task. */

	if (pid == 0) return;

	/* Get the process data */

	pinfo = kvm_getprocs (server->machine->kd, KERN_PROC_PID, pid, &count);

	if ((pinfo == NULL) || (count < 1)) {

		glibtop_warn_io_r (server, "kvm_getprocs (%d)", pid);

		return;

	}

#define        PROC_VMSPACE   ki_vmspace

       buf->rss_rlim = pinfo [0].ki_rssize;

       buf->vsize = buf->size = (guint64)

	       pinfo [0].ki_size;

       buf->resident = buf->rss = (guint64)

	       ps_pgtok (pinfo [0].ki_rssize) * 1024;

       buf->flags |= _glibtop_sysdeps_proc_mem;

#if 0

	/*

	 * It doesn't make any sense to count as shared each and every mmaped file

	 */

	/* Now we get the shared memory. */

	if (kvm_read (server->machine->kd,

		      (unsigned long) pinfo [0].PROC_VMSPACE,

		      (char *) &vmspace, sizeof (vmspace)) != sizeof (vmspace)) {

		glibtop_warn_io_r (server, "kvm_read (vmspace)");

		return;

	}

	first = vmspace.vm_map.header.next;

	if (kvm_read (server->machine->kd,

		      (unsigned long) vmspace.vm_map.header.next,

		      (char *) &entry, sizeof (entry)) != sizeof (entry)) {

		glibtop_warn_io_r (server, "kvm_read (entry)");

		return;

	}

	/* Walk through the `vm_map_entry' list ... */

	/* I tested this a few times with `mmap'; as soon as you write

	 * to the mmap'ed area, the object type changes from OBJT_VNODE

	 * to OBJT_DEFAULT so if seems this really works. */

	while (entry.next != first) {

		if (kvm_read (server->machine->kd,

			      (unsigned long) entry.next,

			      (char *) &entry, sizeof (entry)) != sizeof (entry)) {

			glibtop_warn_io_r (server, "kvm_read (entry)");

			return;

		}

		if (entry.eflags & (MAP_ENTRY_IS_SUB_MAP))

			continue;

		if (!entry.object.vm_object)

			continue;

		/* We're only interested in `vm_object's */

		if (kvm_read (server->machine->kd,

			      (unsigned long) entry.object.vm_object,

			      (char *) &object, sizeof (object)) != sizeof (object)) {

			glibtop_warn_io_r (server, "kvm_read (object)");

			return;

		}

		if (object.type != OBJT_VNODE)

			continue;

		buf->share += object.un_pager.vnp.vnp_size;

	}

	buf->flags |= _glibtop_sysdeps_proc_mem_share;

#endif

}