/* Copyright (C) 1998-99 Martin Baulig

   This file is part of LibGTop 1.0.

   Contributed by Martin Baulig <martin@home-of-linux.org>, April 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/proctime.h>

#include <glibtop/uptime.h>

#include "glibtop_private.h"

static const unsigned long _glibtop_sysdeps_proc_time =

(1L << GLIBTOP_PROC_TIME_UTIME) + (1L << GLIBTOP_PROC_TIME_CUTIME) +

(1L << GLIBTOP_PROC_TIME_RTIME) +

(1L << GLIBTOP_PROC_TIME_STIME) + (1L << GLIBTOP_PROC_TIME_CSTIME) +

(1L << GLIBTOP_PROC_TIME_FREQUENCY) + (1L << GLIBTOP_PROC_TIME_TIMEOUT) +

(1L << GLIBTOP_PROC_TIME_IT_REAL_VALUE) + (1L << GLIBTOP_PROC_TIME_START_TIME);

static const unsigned long _glibtop_sysdeps_proc_time_smp =

(1L << GLIBTOP_PROC_TIME_XCPU_UTIME) + (1L << GLIBTOP_PROC_TIME_XCPU_STIME);

/* Init function. */

void

_glibtop_init_proc_time_s (glibtop *server)

{

	server->sysdeps.proc_time = _glibtop_sysdeps_proc_time;

	if (server->ncpu)

		server->sysdeps.proc_time |= _glibtop_sysdeps_proc_time_smp;

}

/* Provides detailed information about a process. */

void

glibtop_get_proc_time_s (glibtop *server, glibtop_proc_time *buf, pid_t pid)

{

	char buffer [BUFSIZ], *p;

	int i;

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

	if (proc_stat_to_buffer(buffer, sizeof buffer, pid))

		return;

	p = proc_stat_after_cmd (buffer);

	if (!p) return;

	p = skip_multiple_token (p, 11);

	/* clock_t  (1/100 s) */

	buf->utime  = strtoull (p, &p, 0);

	buf->stime  = strtoull (p, &p, 0);

	buf->rtime = buf->utime + buf->stime;

	buf->cutime = strtoull (p, &p, 0);

	buf->cstime = strtoull (p, &p, 0);

	p = skip_multiple_token (p, 3);

	/* timeout is 0 on 2.4 and "thread_number" on 2.6

	   lets skip it (using previous skip_multiple_token)

	   buf->timeout       = strtoull (p, &p, 0);

	*/

	buf->it_real_value = strtoull (p, &p, 0);

	/* seconds since epoch */

	{

	  /*

	     See libgtop documentation.

	     #ifdef __KERNEL__

	     ...

	     *

	     * Have the 32 bit jiffies value wrap 5 minutes after boot

	     * so jiffies wrap bugs show up earlier.

	     *

	     #define INITIAL_JIFFIES ((unsigned long)(unsigned int) (-300*HZ))

	     ...

	     #endif

	     start_time may be incremented by INITIAL_JIFFIES, so start_time

	     may be not be exact. You may also get wrong start_time if your

	     system clock is not synchronised with you hardware clock.

	     'man hwclock'

	  */

	  buf->start_time = get_boot_time(server) + strtoull (p, &p, 0) / 100;

	}

	buf->frequency = 100;

	buf->flags = _glibtop_sysdeps_proc_time;

	if (!server->ncpu)

		return;

	/* FIXME: doesn't work with 2.6 */

	if (proc_file_to_buffer(buffer, sizeof buffer, "/proc/%d/cpu", pid))

		return;

	p = skip_multiple_token (p, 3);

	for (i = 0; i <= server->ncpu; i++) {

		if (!check_cpu_line_warn(server, p + 1, i))

			break;

		p = skip_token(p);

		buf->xcpu_utime [i] = strtoull (p, &p, 0);

		buf->xcpu_stime [i] = strtoull (p, &p, 0);

	}

	buf->flags |= _glibtop_sysdeps_proc_time_smp;

}