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/**
*
* cpulimit - a cpu limiter for Linux
*
* Copyright (C) 2005-2008, by: Angelo Marletta <marlonx80@hotmail.com>
*
* This program 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.
*
* This program 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 this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
#ifndef __PROCESS_H
#define __PROCESS_H
#include <sys/time.h>
#include <unistd.h>
#include <limits.h>
//USER_HZ detection, from openssl code
#ifndef HZ
# if defined(_SC_CLK_TCK) \
&& (!defined(OPENSSL_SYS_VMS) || __CTRL_VER >= 70000000)
# define HZ ((double)sysconf(_SC_CLK_TCK))
# else
# ifndef CLK_TCK
# ifndef _BSD_CLK_TCK_ /* FreeBSD hack */
# define HZ 100.0
# else /* _BSD_CLK_TCK_ */
# define HZ ((double)_BSD_CLK_TCK_)
# endif
# else /* CLK_TCK */
# define HZ ((double)CLK_TCK)
# endif
# endif
#endif
// process descriptor
struct process {
//pid of the process
pid_t pid;
//pid of the process
pid_t ppid;
//start time
int starttime;
//is member of the family?
int member; //TODO: delete this field
//total number of jiffies used by the process at time last_sample
int last_jiffies;
//timestamp when last_jiffies and cpu_usage was calculated
struct timeval last_sample;
//actual cpu usage estimation (value in range 0-1)
double cpu_usage;
//1 if the process is zombie
int is_zombie;
//absolute path of the executable file
char command[PATH_MAX+1];
//system-dependent members
//TODO: delete these members for the sake of portability?
#ifdef __linux__
//preallocate buffers for performance
//name of /proc/PID/stat file
char stat_file[20];
//read buffer for /proc filesystem
char buffer[1024];
#endif
};
int get_proc_info(struct process *p, pid_t pid);
int process_init(struct process *proc, pid_t pid);
int process_monitor(struct process *proc);
int process_close(struct process *proc);
#endif
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