void DoExit(UserContext *context) {
if (1 == current_process->id) {
TracePrintf(1, "Do Exit: init program exiting. Now calling halt.\n");
Halt();
}
if (current_process->parent) {
current_process->status = context->regs[0];
}
TracePrintf(2, "DoExit\n");
KillProc(current_process);
TracePrintf(2, "DoExit: Finished the murder\n");
LoadNextProc(context, BLOCK);
}
//! Kill process which is eating most
void ProcessManager::KillHighest(bool hard)
{
PROCTAB* proc = openproc(PROC_FILLARG | PROC_FILLSTAT | PROC_FILLMEM);
proc_t* proc_info;
// zero out the allocated proc_info memory
//memset(&proc_info, 0, sizeof(proc_info));
proc_t highest;
long current_highest = 0;
int current_score = -100;
Core::DebugLog("Looking for a best candidate");
while (true)
{
proc_info = readproc(proc, NULL);
if (proc_info == NULL)
{
break;
}
if (!Configuration::KillRoot && (int)proc_info->euid == 0)
{
if (Configuration::Verbosity >= 6)
{
Core::DebugLog("Ignoring " + Core::int2String(proc_info->tid) + " owned by root", 6);
}
freeproc(proc_info);
continue;
}
if (IgnoredId(proc_info->euid))
{
Core::DebugLog("Ignoring " + Core::int2String(proc_info->tid) + " owned by ignored account: " + Core::int2String(proc_info->euid), 2);
freeproc(proc_info);
continue;
}
if (proc_info->tid == Configuration::pid && !Configuration::KillSelf)
{
Core::DebugLog("Ignoring " + Core::int2String(proc_info->tid) + " which is current instance of this daemon", 6);
freeproc(proc_info);
continue;
}
int score = 0;
// if it's a root process, decrease the score by 10
if (proc_info->euser == 0)
{
score -= 10;
}
score = score + (int)proc_info->nice;
int badness_score = Core::GetOom(proc_info->tid);
if (badness_score <= -17)
{
// ignore process
freeproc(proc_info);
continue;
}
if (badness_score != 0)
{
score = score + badness_score;
}
// check if this process is using most memory
if ( proc_info->resident * 4 > current_highest )
{
current_highest = proc_info->resident * 4;
score += 10;
}
// if this process has highest score, we flag it for kill
if ( score >= current_score )
{
highest = *proc_info;
current_score = score;
} else
{
if (Configuration::Verbosity >= 12)
{
Core::DebugLog("Process " + Name(proc_info) + "is eating less than highest candidate", 12);
}
}
freeproc(proc_info);
}
if (current_score == -100)
{
Core::ErrorLog("Unable to find any process to kill. System is running OOM and I can't do anything to fix it.");
closeproc(proc);
return;
}
Core::Log("Most preferred process has score " + Core::int2String(current_score) + " : " + Name(&highest) + " killing now");
if (KillExec(&highest) == 0)
{
KillProc((pid_t)highest.tid, hard);
Exec(&highest);
}else
{
Core::Log("Not killed " + Name(&highest) + " because the test command returned different value");
}
closeproc(proc);
return;
}
//! Kill processes that are exceeding the limits
void ProcessManager::KillExcess()
{
PROCTAB* proc = openproc(PROC_FILLARG | PROC_FILLSTAT | PROC_FILLMEM);
Core::DebugLog("Looking for processes that exceed the hard or soft limit", 10);
proc_t *proc_info;
while (true)
{
proc_info = readproc(proc, NULL);
if (proc_info == NULL)
{
break;
}
if (proc_info->tid == Configuration::pid && !Configuration::KillSelf)
{
Core::DebugLog("Ignoring " + Core::int2String(proc_info->tid) + " which is current instance of this daemon", 8);
freeproc(proc_info);
continue;
}
if (!Configuration::KillRoot && (int)proc_info->euid == 0)
{
if (Configuration::Verbosity >= 6)
{
Core::DebugLog("Ignoring " + Core::int2String(proc_info->tid) + " owned by root", 6);
}
freeproc(proc_info);
continue;
}
if (IgnoredId(proc_info->euid))
{
Core::DebugLog("Ignoring " + Core::int2String(proc_info->tid) + " owned by ignored account: " + Core::int2String(proc_info->euid), 3);
freeproc(proc_info);
continue;
}
// check if this process is using most memory
if ( proc_info->resident * 4 > ((long)Configuration::HardMemoryLimitMB * 1024) )
{
Core::Log("Exceeded hard limit - process " + Name(proc_info) + " killing now");
KillProc((pid_t)proc_info->tid, true);
Exec(proc_info);
} else if ( proc_info->resident * 4 > ((long)Configuration::SoftMemoryLimitMB * 1024 ))
{
Core::Log("Exceeded soft limit - process " + Name(proc_info) + " killing now");
if (KillExec(proc_info) == 0)
{
KillProc((pid_t)proc_info->tid, false);
Exec(proc_info);
}else
{
Core::Log("Not killed " + Name(proc_info) + " because the test command returned different value");
}
} else
{
if (Configuration::Verbosity > 12)
{
Core::DebugLog("Not exceeded any limit " + Name(proc_info));
}
}
freeproc(proc_info);
}
closeproc(proc);
return;
}