/********************************************************************************
 *      Copyright:  (C) 2018 LingYun IoT System Studio
 *                  All rights reserved.
 *
 *       Filename:  proc.h
 *    Description:  This head file is for Linux process API
 *
 *        Version:  1.0.0(11/06/2018~)
 *         Author:  Guo Wenxue <guowenxue@gmail.com>
 *      ChangeLog:  1, Release initial version on "11/06/2018 09:21:33 PM"
 *                 
 ********************************************************************************/

#ifndef __CP_PROC_H
#define __CP_PROC_H

#include <signal.h>

#define PID_ASCII_SIZE  11

typedef struct _st_sigproc
{
    int       signal;
    unsigned  stop;     /* 0: Not term  1: Stop  */
}  st_sigproc;


/* global variable for process or thread to exit  */
extern st_sigproc     g_signal;

/* install signal handler  */
extern void install_proc_signal(void);

/* record process PID into $pid_file for check_daemon_running() to check program running or not */
extern int record_daemon_pid(const char *pid_file);

/* check program already running or not  
 * 1: The daemon program alread running   0: Not running
 */
extern int check_daemon_running(const char *pid_file);

/* set program running as daemon */
extern int set_daemon_running(const char *pid_file);

/* create a system command and excute it */
extern void exec_system_cmd(const char *format, ...);

/* create and start a thread to excute function pointed by $thread_workbody  */
typedef void *(thread_function) (void *thread_arg);
extern int thread_start(pthread_t * thread_id, thread_function * thread_workbody, void *thread_arg);

#endif