cmutex.cpp

液晶电视完整代码可实现人机界面

#include "CMuTex.h"
/////////////////////////////////////////////////////////////////////////////
//查找指定进程号的进程是否退出
int CMuTex::ChiProIsLive(int pid)
{
	FILE *fp;
	char sCmd[200], sPid[20];
	
	sprintf(sCmd, "ps -elf | sed '/%d/!d' |", pid );
	sprintf(sCmd, "%s awk '{FS=\" \"}{print $4}' |", sCmd);
	sprintf(sCmd, "%s sed '/%d/!d' 2>/dev/null", sCmd, pid);

	fp=popen(sCmd, "r" );
	if( fp == NULL )
	{
		return 2;
	}
	
	memset( sPid, 0, sizeof(sPid));
	fread((void *)sPid, sizeof(char), 8, fp );
	pclose(fp);
	
	if(atoi(sPid) != pid )
	{ 
		return 0; //the process not exist
	}
	else
	{
		return 1;	//the process is exist
	}
}  

/////////////////////////////////////////////////////////////////////////////
//等待获得互斥量的控制权
int CMuTex::WaitMutex(char * lockfile)
{
	return my_lock_wait(lockfile);
}
/////////////////////////////////////////////////////////////////////////////
//释放对互斥量的控制权
int CMuTex::ReleaseMutex()
{
	return my_lock_release();
}
/////////////////////////////////////////////////////////////////////////////
//保存指定索引的子进程信息
void CMuTex::SetChiProInfo(int index, pid_t chipid, int socket, EChildState chistate)
{
	m_ChiInfo[index].m_chiPid = chipid;
	m_ChiInfo[index].m_chiState = chistate;
	m_ChiInfo[index].m_socket = socket;
}
/////////////////////////////////////////////////////////////////////////////
//保存指定进程ID的子进程信息
void CMuTex::SetChiProInfoEx(pid_t chipid, EChildState chistate)
{
	int I;
	for(I = 0; I < m_childcount; I++)
	{
		if(m_ChiInfo[I].m_chiPid == chipid)
		{
			m_ChiInfo[I].m_chiState = chistate;
			break;
		}
	}
}
/////////////////////////////////////////////////////////////////////////////
//得到子进程的状态
EChildState CMuTex::GetChiProState(int index)
{
	return m_ChiInfo[index].m_chiState;
}
/////////////////////////////////////////////////////////////////////////////
//得到子进程的ID
pid_t CMuTex::GetChiProPid(int index)
{
	return m_ChiInfo[index].m_chiPid;
}

/////////////////////////////////////////////////////////////////////////////
//监控子进程的状态
int CMuTex::WatchChiPro()
{
	int I;
	for(I = 0; I < m_childcount; I++)
	{
		if((m_ChiInfo[I].m_chiPid != -1) && !ChiProIsLive(m_ChiInfo[I].m_chiPid))
		{
			m_ChiInfo[I].m_chiState = csDead;
		}
	}
	return 0;
}

//获得子进程的套接字
int CMuTex::GetChiProSoc(int index, int pid)
{
	int i=0;
	if(pid != 0)
	{
		for(i=0; i<m_childcount; i++)
		{
			if(m_ChiInfo[i].m_chiPid == pid)
			{
				return m_ChiInfo[i].m_socket;
			}
		}
	}
	else
	{
		return m_ChiInfo[index].m_socket;
	}
	return -1;
}