watch

README.md

Watch

プロセスを監視する＜●＞＜●＞

build

gcc watch.c -o watch

watch

watch.c

#include <stdio.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <sys/resource.h>
#include <unistd.h>
#include <signal.h>
int main(int argc, char **argv){
  if(argc <= 1)
	{
		printf("usage:%s WatchTarget\n",argv[0]);
		return 1;
	}
	pid_t pid;
  pid = fork();
	#ifdef _DEBUG
	printf("DEBUG%d\t%d\t%sargv[1]\n",pid,getpid(),argv[1]);
  #endif
	if(pid == 0)
	{
		execvp(argv[1], (char**)(&argv[1]));
	}
	else
	{
		if(pid != -1)
		{
		int count = 0;
			struct rlimit rlim;
			struct rusage usage;
			rlim.rlim_cur = 4194304;
			rlim.rlim_max = 4194304;
			setrlimit(RLIMIT_AS, &rlim);
			rlim.rlim_cur = 1;
			rlim.rlim_max = 1;
			setrlimit(RLIMIT_NOFILE, &rlim);
			rlim.rlim_cur = 4000000;
			rlim.rlim_max = 4000000;
			setrlimit(RLIMIT_CPU, &rlim);
			
		while(1)
		{

			int r = waitpid(pid, NULL, WNOHANG);//kill(pid,0);
			getrusage(RUSAGE_SELF, &usage);
			if(usage.ru_maxrss >= 4194304)
			{
				kill(pid, SIGINT);
				break;
			}
			if(r == pid || r == -1)
			{
				break;
			}
			if(count >= 4000000)
			{
				kill(pid, SIGINT);
				break;
			}
			count += 10000;
			usleep(10000);//0.001秒毎に監視
		}
			wait(NULL);
		}

		//int status = 0;
		//wait(&status);
		return 0;
	}
  return 0;
}