/* $Id$ */

/* Copyright (C) 1995, 1996, 1997 Free Software Foundation, Inc.
   This file is part of the Gnome Top Library.
   Contributed by Joshua Sled <jsled@xcf.berkeley.edu>, July 1998.

   The Gnome Top Library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Library General Public License as
   published by the Free Software Foundation; either version 2 of the
   License, or (at your option) any later version.

   The Gnome Top Library 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
   Library General Public License for more details.

   You should have received a copy of the GNU Library General Public
   License along with the GNU C Library; see the file COPYING.LIB.  If not,
   write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
   Boston, MA 02111-1307, USA.  */

#include <glibtop.h>
#include <glibtop/error.h>
#include <glibtop/prockernel.h>

#include <glibtop_suid.h>

#include <kvm.h>
#include <sys/param.h>
#include <sys/sysctl.h>
#include <sys/proc.h>
#include <sys/user.h>
#include <machine/pcb.h>
#include <machine/tss.h>

#include <unistd.h>
#include <fcntl.h>

static const unsigned long _glibtop_sysdeps_proc_kernel_pstats =
(1 << GLIBTOP_PROC_KERNEL_MIN_FLT) +
(1 << GLIBTOP_PROC_KERNEL_MAJ_FLT) +
(1 << GLIBTOP_PROC_KERNEL_CMIN_FLT) +
(1 << GLIBTOP_PROC_KERNEL_CMAJ_FLT);

static const unsigned long _glibtop_sysdeps_proc_kernel_pcb =
(1 << GLIBTOP_PROC_KERNEL_KSTK_EIP) +
(1 << GLIBTOP_PROC_KERNEL_KSTK_ESP);

static const unsigned long _glibtop_sysdeps_proc_kernel_wchan =
(1 << GLIBTOP_PROC_KERNEL_NWCHAN) +
(1 << GLIBTOP_PROC_KERNEL_WCHAN);

/* Init function. */

void
glibtop_init_proc_kernel_p (glibtop *server)
{
	server->sysdeps.proc_kernel = _glibtop_sysdeps_proc_kernel_pstats |
		_glibtop_sysdeps_proc_kernel_pcb |
		_glibtop_sysdeps_proc_kernel_wchan;
}

void
glibtop_get_proc_kernel_p (glibtop *server,
			   glibtop_proc_kernel *buf,
			   pid_t pid)
{
	struct kinfo_proc *pinfo;
	struct user *u_addr = (struct user *)USRSTACK;
	struct pstats pstats;
	struct pcb pcb;
	int f, count;

	glibtop_init_p (server, (1 << GLIBTOP_SYSDEPS_PROC_KERNEL), 0);
	
	memset (buf, 0, sizeof (glibtop_proc_kernel));

	glibtop_suid_enter (server);

	/* Get the process information */
	pinfo = kvm_getprocs (server->machine.kd, KERN_PROC_PID, pid, &count);
	if ((pinfo == NULL) || (count != 1))
		glibtop_error_io_r (server, "kvm_getprocs (%d)", pid);

	/* Taken from `saveuser ()' in `/usr/src/bin/ps/ps.c'. */

	/* [FIXME]: /usr/include/sys/user.h tells me that the user area
	 *          may or may not be at the same kernel address in all
	 *          processes, but I don't see any way to get that address.
	 *          Since `ps' simply uses its own address, I think it's
	 *          safe to do this here, too. */

	/* NOTE: You need to mount the /proc filesystem to make
	 *       `kvm_uread' work. */
	
	if ((pinfo [0].kp_proc.p_flag & P_INMEM) &&
	    kvm_uread (server->machine.kd, &(pinfo [0]).kp_proc,
		       (unsigned long) &u_addr->u_stats,
		       (char *) &pstats, sizeof (pstats)) == sizeof (pstats))
		{
			/*
			 * The u-area might be swapped out, and we can't get
			 * at it because we have a crashdump and no swap.
			 * If it's here fill in these fields, otherwise, just
			 * leave them 0.
			 */

			buf->min_flt = (u_int64_t) pstats.p_ru.ru_minflt;
			buf->maj_flt = (u_int64_t) pstats.p_ru.ru_majflt;
			buf->cmin_flt = (u_int64_t) pstats.p_cru.ru_minflt;
			buf->cmaj_flt = (u_int64_t) pstats.p_cru.ru_majflt;
			
			buf->flags |= _glibtop_sysdeps_proc_kernel_pstats;
		}

	if ((pinfo [0].kp_proc.p_flag & P_INMEM) &&
	    kvm_uread (server->machine.kd, &(pinfo [0]).kp_proc,
		       (unsigned long) &u_addr->u_pcb,
		       (char *) &pcb, sizeof (pcb)) == sizeof (pcb))
		{
			/* Same like with pstats above. */
			
			buf->kstk_esp = (u_int64_t) pcb.pcb_ksp;
			buf->kstk_eip = (u_int64_t) pcb.pcb_pc;
			
			buf->flags |= _glibtop_sysdeps_proc_kernel_pcb;
		}

	/* Taken from `wchan ()' in `/usr/src/bin/ps/print.c'. */

	glibtop_suid_leave (server);

	buf->nwchan = (unsigned long) pinfo [0].kp_proc.p_wchan &~ KERNBASE;

	if (pinfo [0].kp_proc.p_wchan && pinfo [0].kp_proc.p_wmesg) {
		strncpy (buf->wchan, pinfo [0].kp_eproc.e_wmesg,
			 sizeof (buf->wchan) - 1);
		buf->wchan [sizeof (buf->wchan) - 1] = 0;
	} else {
		buf->wchan [0] = 0;
	}
	
	buf->flags |= _glibtop_sysdeps_proc_kernel_wchan;
}