/* $Id$ */

/* 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 =
(1 << GLIBTOP_PROC_KERNEL_K_FLAGS) +
(1 << GLIBTOP_PROC_KERNEL_MIN_FLT) +
(1 << GLIBTOP_PROC_KERNEL_MAJ_FLT) +
(1 << GLIBTOP_PROC_KERNEL_CMIN_FLT) +
(1 << GLIBTOP_PROC_KERNEL_CMAJ_FLT) +
(1 << GLIBTOP_PROC_KERNEL_KSTK_ESP) +
(1 << GLIBTOP_PROC_KERNEL_KSTK_EIP) +
(1 << GLIBTOP_PROC_KERNEL_WCHAN);

/* Init function. */

void
glibtop_init_proc_kernel_p (glibtop *server)
{
	server->sysdeps.proc_kernel = _glibtop_sysdeps_proc_kernel;
}

void
glibtop_get_proc_kernel_p (glibtop *server,
			   glibtop_proc_kernel *buf,
			   pid_t pid)
{
	struct kinfo_proc *pinfo;
	struct i386tss *pcb_tss;
	int f, count, kmem;
	struct pstats ps;
	struct user usr;

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

	/* Get the information pertaining to the given PID */
	pinfo = kvm_getprocs (server->machine.kd, KERN_PROC_PID, pid, &count);
	if (count != 1) {
		return; /* the 0-filled struct, since we can't get any info */
	}

	kmem = open ("/dev/kmem", O_RDONLY, NULL);
	if (f == NULL)
		glibtop_error_io_r (server, "open (/dev/kmem)");

	/* Read the p_stats struct from kernel memory */
	lseek (f, (long) pinfo[0].kp_proc.p_stats, SEEK_SET);
	if (read (f, &ps, sizeof (struct pstats)))
		glibtop_error_io_r (server, "read");
	/* Read the struct at kp_proc.p_addr */
	lseek (f, (long) pinfo[0].kp_proc.p_addr, SEEK_SET);
	if (read(f, &usr, sizeof (struct user)))
		glibtop_error_io_r (server, "read");
	close (f);

	
	/* kflags:
	   kinfo_proc.e_flag?
	   proc.p_flag
	   proc.p_stat
	*/
	buf->k_flags = pinfo[0].kp_eproc.e_flag;
	
	/* min_flt: rusage.ru_minflt */
	buf->min_flt = ps.p_ru.ru_minflt;
	/* maj_flt: rusage.ru_majflt */
	buf->maj_flt = ps.p_ru.ru_majflt;
	/* cmin_flt: */
	buf->cmin_flt = ps.p_cru.ru_minflt;
	/* cmaj_flt: */
	buf->cmaj_flt = ps.p_cru.ru_majflt;
	
	/* kstk_esp: pcb_tss.tss_esp */
	buf->kstk_esp = (u_int64_t) usr.u_pcb.pcb_ksp;
	/* kstk_eip: pcb_tss.tss_eip */
	buf->kstk_eip = (u_int64_t) usr.u_pcb.pcb_pc;
	
	/* wchan : kinfo_proc.proc.p_wchan */
	buf->wchan = (u_int64_t) pinfo[0].kp_proc.p_wchan;
}