Function SysGetNextProcessInfo

Kernel/src/arch/x86_64/syscalls.cpp:1829–1868

//////////////////////// \brief SysGetNextProcessInfo (pidP, pInfo) \param pidP - Pointer to an unsigned integer holding a PID \param pInfo - Pointer to process_info_t struct \return On Success - Return 0 \return No more processes - Return 1 On Failure - Return error as negative value ////////////////////////

/// On Failure - Return error as negative value
/////////////////////////////
long SysGetNextProcessInfo(regs64_t* r){
	uint64_t* pidP = reinterpret_cast<uint64_t*>(SC_ARG0(r));
	process_info_t* pInfo = reinterpret_cast<process_info_t*>(SC_ARG1(r));

	process_t* cProcess = Scheduler::GetCurrentProcess();
	if(!Memory::CheckUsermodePointer(SC_ARG1(r), sizeof(process_info_t), cProcess->addressSpace)){
		return -EFAULT;
	}

	if(!Memory::CheckUsermodePointer(SC_ARG0(r), sizeof(uint64_t), cProcess->addressSpace)){
		return -EFAULT;
	}

	*pidP = Scheduler::GetNextProccessPID(*pidP);

	if(!(*pidP)){
		return 1; // No more processes
	}

	process_t* reqProcess;
	if(!(reqProcess = Scheduler::FindProcessByPID(*pidP))){
		return -EINVAL;
	}

	pInfo->pid = *pidP;

	pInfo->threadCount = reqProcess->threadCount;

	pInfo->uid = reqProcess->uid;
	pInfo->gid = reqProcess->gid;

	pInfo->state = reqProcess->state;

	strcpy(pInfo->name, reqProcess->name);

	pInfo->runningTime = Timer::GetSystemUptime() - reqProcess->creationTime.seconds;
	pInfo->activeUs = reqProcess->activeTicks * 1000000 / Timer::GetFrequency();

	return 0;
}

/////////////////////////////
/// \brief SysReadLink(pathname, buf, bufsize) Read a symbolic link