#define _GNU_SOURCE
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <dirent.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <string.h>

int main(int argc,char * argv[]){
	DIR *dir;
	struct dirent *d;
	struct stat st;
	int fd;
	char buf[256];
	int n;
	char *p;
	int i;
	int signum;
	pid_t sid,pid;
	pid_t mypid = getpid();
	pid_t mysid = getsid(mypid);
	
	if(argc < 2)
		exit(EXIT_FAILURE);
	
	signum = strtol(&argv[1][argv[1][0] == '-' ? 1 : 0],NULL,10);
	if(signum == 0)
		exit(EXIT_FAILURE);
		
	if(stat("/proc/version",&st) < 0)
		exit(EXIT_FAILURE);
	dir = opendir("/proc");
	if(dir == NULL)
		exit(EXIT_FAILURE);
		
	while((d = readdir(dir))!=NULL){
		pid = strtoul(d->d_name,&p,10);
		if(*p != '\0') continue;
		if(pid == 1) continue;
		snprintf(buf,sizeof(buf),"/proc/%s/stat",d->d_name);
		fd = open(buf,O_RDONLY);
		if(fd == -1) continue;
		n = read(fd,buf,sizeof(buf)-1);
		close(fd);
		buf[n] = '\0';
		
		p = buf;
		for(i=0;i<5;i++){
			 p = strchr(p,' ');
			 if(p==NULL) break;
			 p++;
		}
		if(p==NULL) continue;
		sid = strtoul(p,&p,10);
		if(*p != ' ') continue;
		
		if(sid == mysid) continue;
		
		printf("Killing %d with %d\n",pid,signum);
	}
	 
	return(EXIT_SUCCESS);
}