讀的痛苦又快樂。。。

//
// File:   main.cc
// Author: sempr
// refacted by zhblue
 /*
 * Copyright 2008 sempr <[email protected]>
 *
 * Refacted and modified by zhblue<[email protected]>
 * Bug report email [email protected]
 *
 *
 * This file is part of HUSTOJ.
 *
 * HUSTOJ is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * HUSTOJ is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with HUSTOJ. if not, see <http://www.gnu.org/licenses/>.
 */

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <dirent.h>
#include <unistd.h>
#include <time.h>
#include <stdarg.h>
#include <ctype.h>
#include <sys/wait.h>
#include <sys/ptrace.h>
#include <sys/types.h>
#include <sys/user.h>
#include <sys/syscall.h>
#include <sys/time.h>
#include <sys/resource.h>
#include <sys/signal.h>
//#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <mysql/mysql.h>
#include <assert.h>
#include "okcalls.h"

#define STD_MB 1048576
#define STD_T_LIM 2
#define STD_F_LIM (STD_MB<<5)
#define STD_M_LIM (STD_MB<<7)
#define BUFFER_SIZE 512

#define OJ_WT0 0
#define OJ_WT1 1
#define OJ_CI 2
#define OJ_RI 3
#define OJ_AC 4
#define OJ_PE 5
#define OJ_WA 6
#define OJ_TL 7
#define OJ_ML 8
#define OJ_OL 9
#define OJ_RE 10
#define OJ_CE 11
#define OJ_CO 12
#define OJ_TR 13
/*copy from ZOJ
 http://code.google.com/p/zoj/source/browse/trunk/judge_client/client/tracer.cc?spec=svn367&r=367#39
 */
#ifdef __i386
#define REG_SYSCALL orig_eax
#define REG_RET eax
#define REG_ARG0 ebx
#define REG_ARG1 ecx
#else
#define REG_SYSCALL orig_rax
#define REG_RET rax
#define REG_ARG0 rdi
#define REG_ARG1 rsi

#endif

//目錄分佈
//home/judge

//home/judge/data
//home/judge/data/1000			題目編號1000 
//home/judge/data/1000/sample.in 樣例資料輸入 
//home/judge/data/1000/sample.out 樣例資料輸出 
//home/judge/data/1000/test.in	測試資料輸入 
//home/judge/data/1000/test.out	測試資料輸出 

//home/judge/etc
//home/judge/etc/java0.policy Java編譯的配置 
//home/judge/etc/judge.conf 配置檔案，core與web為輪詢資料庫方式下 
 
//home/judge/log 如果啟用除錯，日誌儲存目錄 
//home/judge/run0	可以啟用的除錯程序0 -3共4個預設的 也就是max_ruuning 預設值 
//home/judge/run1
//home/judge/run2
//home/judge/run3



static int DEBUG = 0;	//是否啟用除錯預設否 
static char host_name[BUFFER_SIZE];//主機地址 
static char user_name[BUFFER_SIZE];//使用者名稱 
static char password[BUFFER_SIZE];//密碼 
static char db_name[BUFFER_SIZE];//資料庫名稱 
static char oj_home[BUFFER_SIZE];//盼題目錄 預設/home/judge 
static int port_number; //埠 
static int max_running; //最大的程序數 
static int sleep_time;  //輪詢時間間隔 
static int java_time_bonus = 5;
static int java_memory_bonus = 512;
static char java_xms[BUFFER_SIZE];
static char java_xmx[BUFFER_SIZE];
static int sim_enable = 0; //是否啟用相似度查重 
static int oi_mode = 0; //編譯模式 ,在update_solution中用到了 
static int use_max_time = 0; //設定的最大執行時間 

static int http_judge = 0; //core與web連結方式，預設，輪詢資料庫 
static char http_baseurl[BUFFER_SIZE]; 

static char http_username[BUFFER_SIZE]; //網路使用者名稱？ 
static char http_password[BUFFER_SIZE];
static int shm_run = 0; //這個事什麼意思？？？？ 

static char record_call = 0;

//static int sleep_tmp;
#define ZOJ_COM
MYSQL *conn; //資料庫連結，開始初始化，最終釋放資源 

static char lang_ext[13][8] = { "c", "cc", "pas", "java", "rb", "sh", "py",
		"php", "pl", "cs", "m", "bas", "scm" }; //測試語言列表 0 c 1 c++ 
//static char buf[BUFFER_SIZE];

long get_file_size(const char * filename) {
	struct stat f_stat;

	if (stat(filename, &f_stat) == -1) {
		return 0;
	}

	return (long) f_stat.st_size;
}

void write_log(const char *fmt, ...) {
	va_list ap;
	char buffer[4096];
	//      time_t          t = time(NULL);
	//int l;
	sprintf(buffer, "%s/log/client.log", oj_home);
	FILE *fp = fopen(buffer, "a+");
	if (fp == NULL) {
		fprintf(stderr, "openfile error!\n");
		system("pwd");
	}
	va_start(ap, fmt);
	//l = 
	vsprintf(buffer, fmt, ap);
	fprintf(fp, "%s\n", buffer);
	if (DEBUG)
		printf("%s\n", buffer);
	va_end(ap);
	fclose(fp);

}
int execute_cmd(const char * fmt, ...) {
	char cmd[BUFFER_SIZE];

	int ret = 0;
	va_list ap;

	va_start(ap, fmt);
	vsprintf(cmd, fmt, ap);
	ret = system(cmd);
	va_end(ap);
	return ret;
}

const int call_array_size = 512;
int call_counter[call_array_size] = { 0 };
static char LANG_NAME[BUFFER_SIZE];
void init_syscalls_limits(int lang) {
	int i;
	memset(call_counter, 0, sizeof(call_counter));
	if (DEBUG)
		write_log("init_call_counter:%d", lang);
	if (record_call) { // C & C++
		for (i = 0; i < call_array_size; i++) {
			call_counter[i] = 0;
		}
	} else if (lang <= 1) { // C & C++
		for (i = 0; i==0||LANG_CV[i]; i++) {
			call_counter[LANG_CV[i]] = HOJ_MAX_LIMIT;
		}
	} else if (lang == 2) { // Pascal
		for (i = 0; i==0||LANG_PV[i]; i++)
			call_counter[LANG_PV[i]] = HOJ_MAX_LIMIT;
	} else if (lang == 3) { // Java
		for (i = 0; i==0||LANG_JV[i]; i++)
			call_counter[LANG_JV[i]] = HOJ_MAX_LIMIT;
	} else if (lang == 4) { // Ruby
		for (i = 0; i==0||LANG_RV[i]; i++)
			call_counter[LANG_RV[i]] = HOJ_MAX_LIMIT;
	} else if (lang == 5) { // Bash
		for (i = 0; i==0||LANG_BV[i]; i++)
			call_counter[LANG_BV[i]] = HOJ_MAX_LIMIT;
	} else if (lang == 6) { // Python
		for (i = 0; i==0||LANG_YV[i]; i++)
			call_counter[LANG_YV[i]] = HOJ_MAX_LIMIT;
	} else if (lang == 7) { // php
		for (i = 0; i==0||LANG_PHV[i]; i++)
			call_counter[LANG_PHV[i]] = HOJ_MAX_LIMIT;
	} else if (lang == 8) { // perl
		for (i = 0; i==0||LANG_PLV[i]; i++)
			call_counter[LANG_PLV[i]] = HOJ_MAX_LIMIT;
	} else if (lang == 9) { // mono c#
		for (i = 0; i==0||LANG_CSV[i]; i++)
			call_counter[LANG_CSV[i]] = HOJ_MAX_LIMIT;
	} else if (lang == 10) { //objective c
		for (i = 0; i==0||LANG_OV[i]; i++)
			call_counter[LANG_OV[i]] = HOJ_MAX_LIMIT;
	} else if (lang == 11) { //free basic
		for (i = 0; i==0||LANG_BASICV[i]; i++)
			call_counter[LANG_BASICV[i]] = HOJ_MAX_LIMIT;
	} else if (lang == 12) { //scheme guile
		for (i = 0; i==0||LANG_SV[i]; i++)
			call_counter[LANG_SV[i]] = HOJ_MAX_LIMIT;
	}

}

int after_equal(char * c) {
	int i = 0;
	for (; c[i] != '\0' && c[i] != '='; i++)
		;
	return ++i;
}
void trim(char * c) {
	char buf[BUFFER_SIZE];
	char * start, *end;
	strcpy(buf, c);
	start = buf;
	while (isspace(*start))
		start++;
	end = start;
	while (!isspace(*end))
		end++;
	*end = '\0';
	strcpy(c, start);
}
bool read_buf(char * buf, const char * key, char * value) {
	if (strncmp(buf, key, strlen(key)) == 0) {
		strcpy(value, buf + after_equal(buf));
		trim(value);
		if (DEBUG)
			printf("%s\n", value);
		return 1;
	}
	return 0;
}
void read_int(char * buf, const char * key, int * value) {
	char buf2[BUFFER_SIZE];
	if (read_buf(buf, key, buf2))
		sscanf(buf2, "%d", value);

}
// read the configue file
void init_mysql_conf() {
	FILE *fp = NULL;
	char buf[BUFFER_SIZE];
	host_name[0] = 0;
	user_name[0] = 0;
	password[0] = 0;
	db_name[0] = 0;
	port_number = 3306;
	max_running = 3;
	sleep_time = 3;
	strcpy(java_xms, "-Xms32m");
	strcpy(java_xmx, "-Xmx256m");
	sprintf(buf, "%s/etc/judge.conf", oj_home);
	fp = fopen("./etc/judge.conf", "r");
	if (fp != NULL) {
		while (fgets(buf, BUFFER_SIZE - 1, fp)) {
			read_buf(buf, "OJ_HOST_NAME", host_name);
			read_buf(buf, "OJ_USER_NAME", user_name);
			read_buf(buf, "OJ_PASSWORD", password);
			read_buf(buf, "OJ_DB_NAME", db_name);
			read_int(buf, "OJ_PORT_NUMBER", &port_number);
			read_int(buf, "OJ_JAVA_TIME_BONUS", &java_time_bonus);
			read_int(buf, "OJ_JAVA_MEMORY_BONUS", &java_memory_bonus);
			read_int(buf, "OJ_SIM_ENABLE", &sim_enable);
			read_buf(buf, "OJ_JAVA_XMS", java_xms);
			read_buf(buf, "OJ_JAVA_XMX", java_xmx);
			read_int(buf, "OJ_HTTP_JUDGE", &http_judge);
			read_buf(buf, "OJ_HTTP_BASEURL", http_baseurl);
			read_buf(buf, "OJ_HTTP_USERNAME", http_username);
			read_buf(buf, "OJ_HTTP_PASSWORD", http_password);
			read_int(buf, "OJ_OI_MODE", &oi_mode);
			read_int(buf, "OJ_SHM_RUN", &shm_run);
			read_int(buf, "OJ_USE_MAX_TIME", &use_max_time);

		}
		//fclose(fp);
	}
}

//功能：判斷是否是輸入檔案
//輸入：/home/judge/data/1000下的檔案全名 sample.in sample.out test.in test.out
//輸出：如果檔案長度<=3或者不是以.in結尾，則返回0；
//      否則返回檔案主名長度sample 6 test 4 
int isInFile(const char fname[]) {
	int l = strlen(fname);
	if (l <= 3 || strcmp(fname + l - 3, ".in") != 0)
		return 0;
	else
		return l - 3;//返回檔名長度 sample 6 test 4 
}

void find_next_nonspace(int & c1, int & c2, FILE *& f1, FILE *& f2, int & ret) {
	// Find the next non-space character or \n.
	while ((isspace(c1)) || (isspace(c2))) {
		if (c1 != c2) {
			if (c2 == EOF) {
				do {
					c1 = fgetc(f1);
				} while (isspace(c1));
				continue;
			} else if (c1 == EOF) {
				do {
					c2 = fgetc(f2);
				} while (isspace(c2));
				continue;
			} else if ((c1 == '\r' && c2 == '\n')) {
				c1 = fgetc(f1);
			} else if ((c2 == '\r' && c1 == '\n')) {
				c2 = fgetc(f2);
			} else {
				if (DEBUG)
					printf("%d=%c\t%d=%c", c1, c1, c2, c2);
				;
				ret = OJ_PE;
			}
		}
		if (isspace(c1)) {
			c1 = fgetc(f1);
		}
		if (isspace(c2)) {
			c2 = fgetc(f2);
		}
	}
}

/***
 int compare_diff(const char *file1,const char *file2){
 char diff[1024];
 sprintf(diff,"diff -q -B -b -w --strip-trailing-cr %s %s",file1,file2);
 int d=system(diff);
 if (d) return OJ_WA;
 sprintf(diff,"diff -q -B --strip-trailing-cr %s %s",file1,file2);
 int p=system(diff);
 if (p) return OJ_PE;
 else return OJ_AC;

 }
 */
const char * getFileNameFromPath(const char * path) {
	for (int i = strlen(path); i >= 0; i--) {
		if (path[i] == '/')
			return &path[i];
	}
	return path;
}
void make_diff_out(FILE *f1, FILE *f2, int c1, int c2, const char * path) {
	FILE *out;
	char buf[45];
	out = fopen("diff.out", "a+");
	fprintf(out, "=================%s\n", getFileNameFromPath(path));
	fprintf(out, "Right:\n%c", c1);
	if (fgets(buf, 44, f1)) {
		fprintf(out, "%s", buf);
	}
	fprintf(out, "\n-----------------\n");
	fprintf(out, "Your:\n%c", c2);
	if (fgets(buf, 44, f2)) {
		fprintf(out, "%s", buf);
	}
	fprintf(out, "\n=================\n");
	fclose(out);
}

/*
 * translated from ZOJ judger r367
 * http://code.google.com/p/zoj/source/browse/trunk/judge_client/client/text_checker.cc#25
 *
 */
int compare_zoj(const char *file1, const char *file2) {
	int ret = OJ_AC;
	int c1, c2;
	FILE * f1, *f2;
	f1 = fopen(file1, "r");
	f2 = fopen(file2, "r");
	if (!f1 || !f2) {
		ret = OJ_RE;
	} else
		for (;;) {
			// Find the first non-space character at the beginning of line.
			// Blank lines are skipped.
			c1 = fgetc(f1);
			c2 = fgetc(f2);
			find_next_nonspace(c1, c2, f1, f2, ret);
			// Compare the current line.
			for (;;) {
				// Read until 2 files return a space or 0 together.
				while ((!isspace(c1) && c1) || (!isspace(c2) && c2)) {
					if (c1 == EOF && c2 == EOF) {
						goto end;
					}
					if (c1 == EOF || c2 == EOF) {
						break;
					}
					if (c1 != c2) {
						// Consecutive non-space characters should be all exactly the same
						ret = OJ_WA;
						goto end;
					}
					c1 = fgetc(f1);
					c2 = fgetc(f2);
				}
				find_next_nonspace(c1, c2, f1, f2, ret);
				if (c1 == EOF && c2 == EOF) {
					goto end;
				}
				if (c1 == EOF || c2 == EOF) {
					ret = OJ_WA;
					goto end;
				}

				if ((c1 == '\n' || !c1) && (c2 == '\n' || !c2)) {
					break;
				}
			}
		}
	end: if (ret == OJ_WA)
		make_diff_out(f1, f2, c1, c2, file1);
	if (f1)
		fclose(f1);
	if (f2)
		fclose(f2);
	return ret;
}

void delnextline(char s[]) {
	int L;
	L = strlen(s);
	while (L > 0 && (s[L - 1] == '\n' || s[L - 1] == '\r'))
		s[--L] = 0;
}

int compare(const char *file1, const char *file2) {
#ifdef ZOJ_COM
	//compare ported and improved from zoj don't limit file size
	return compare_zoj(file1, file2);
#endif
#ifndef ZOJ_COM
	//the original compare from the first version of hustoj has file size limit
	//and waste memory
	FILE *f1,*f2;
	char *s1,*s2,*p1,*p2;
	int PEflg;
	s1=new char[STD_F_LIM+512];
	s2=new char[STD_F_LIM+512];
	if (!(f1=fopen(file1,"r")))
	return OJ_AC;
	for (p1=s1;EOF!=fscanf(f1,"%s",p1);)
	while (*p1) p1++;
	fclose(f1);
	if (!(f2=fopen(file2,"r")))
	return OJ_RE;
	for (p2=s2;EOF!=fscanf(f2,"%s",p2);)
	while (*p2) p2++;
	fclose(f2);
	if (strcmp(s1,s2)!=0) {
		//              printf("A:%s\nB:%s\n",s1,s2);
		delete[] s1;
		delete[] s2;

		return OJ_WA;
	} else {
		f1=fopen(file1,"r");
		f2=fopen(file2,"r");
		PEflg=0;
		while (PEflg==0 && fgets(s1,STD_F_LIM,f1) && fgets(s2,STD_F_LIM,f2)) {
			delnextline(s1);
			delnextline(s2);
			if (strcmp(s1,s2)==0) continue;
			else PEflg=1;
		}
		delete [] s1;
		delete [] s2;
		fclose(f1);fclose(f2);
		if (PEflg) return OJ_PE;
		else return OJ_AC;
	}
#endif
}

FILE * read_cmd_output(const char * fmt, ...) {
	char cmd[BUFFER_SIZE];

	FILE * ret = NULL;
	va_list ap;

	va_start(ap, fmt);
	vsprintf(cmd, fmt, ap);
	va_end(ap);
	if (DEBUG)
		printf("%s\n", cmd);
	ret = popen(cmd, "r");

	return ret;
}
bool check_login() {
	const char * cmd =
			" wget --post-data=\"checklogin=1\" --load-cookies=cookie --save-cookies=cookie --keep-session-cookies -q -O - \"%s/admin/problem_judge.php\"";
	int ret = 0;
	FILE * fjobs = read_cmd_output(cmd, http_baseurl);
	fscanf(fjobs, "%d", &ret);
	pclose(fjobs);

	return ret;
}
void login() {
	if (!check_login()) {
		const char * cmd =
				"wget --post-data=\"user_id=%s&password=%s\" --load-cookies=cookie --save-cookies=cookie --keep-session-cookies -q -O - \"%s/login.php\"";
		FILE * fjobs = read_cmd_output(cmd, http_username, http_password,
				http_baseurl);
		//fscanf(fjobs,"%d",&ret);
		pclose(fjobs);
	}

}
/* write result back to database */
void _update_solution_mysql(int solution_id, int result, int time, int memory,
		int sim, int sim_s_id, double pass_rate) {
	char sql[BUFFER_SIZE];
	if (oi_mode) {
		sprintf(sql,
				"UPDATE solution SET result=%d,time=%d,memory=%d,judgetime=NOW(),pass_rate=%f WHERE solution_id=%d LIMIT 1%c",
				result, time, memory, pass_rate, solution_id, 0);
	} else {
		sprintf(sql,
				"UPDATE solution SET result=%d,time=%d,memory=%d,judgetime=NOW() WHERE solution_id=%d LIMIT 1%c",
				result, time, memory, solution_id, 0);
	}
	//      printf("sql= %s\n",sql);
	if (mysql_real_query(conn, sql, strlen(sql))) {
		//              printf("..update failed! %s\n",mysql_error(conn));
	}
	if (sim) {
		sprintf(sql,
				"insert into sim(s_id,sim_s_id,sim) values(%d,%d,%d) on duplicate key update  sim_s_id=%d,sim=%d",
				solution_id, sim_s_id, sim, sim_s_id, sim);
		//      printf("sql= %s\n",sql);
		if (mysql_real_query(conn, sql, strlen(sql))) {
			//              printf("..update failed! %s\n",mysql_error(conn));
		}

	}

}
void _update_solution_http(int solution_id, int result, int time, int memory,
		int sim, int sim_s_id, double pass_rate) {
	const char * cmd =
			" wget --post-data=\"update_solution=1&sid=%d&result=%d&time=%d&memory=%d&sim=%d&simid=%d&pass_rate=%f\" --load-cookies=cookie --save-cookies=cookie --keep-session-cookies -q -O - \"%s/admin/problem_judge.php\"";
	FILE * fjobs = read_cmd_output(cmd, solution_id, result, time, memory, sim,
			sim_s_id, pass_rate, http_baseurl);
	//fscanf(fjobs,"%d",&ret);
	pclose(fjobs);
}
void update_solution(int solution_id, int result, int time, int memory, int sim,
		int sim_s_id, double pass_rate) {
	if (result == OJ_TL && memory == 0)
		result = OJ_ML;
	if (http_judge) {
		_update_solution_http(solution_id, result, time, memory, sim, sim_s_id,
				pass_rate);
	} else {
		_update_solution_mysql(solution_id, result, time, memory, sim, sim_s_id,
				pass_rate);
	}
}
/* write compile error message back to database */
void _addceinfo_mysql(int solution_id) {
	char sql[(1 << 16)], *end;
	char ceinfo[(1 << 16)], *cend;
	FILE *fp = fopen("ce.txt", "r");
	snprintf(sql, (1 << 16) - 1, "DELETE FROM compileinfo WHERE solution_id=%d",
			solution_id);
	mysql_real_query(conn, sql, strlen(sql));
	cend = ceinfo;
	while (fgets(cend, 1024, fp)) {
		cend += strlen(cend);
		if (cend - ceinfo > 40000)
			break;
	}
	cend = 0;
	end = sql;
	strcpy(end, "INSERT INTO compileinfo VALUES(");
	end += strlen(sql);
	*end++ = '\'';
	end += sprintf(end, "%d", solution_id);
	*end++ = '\'';
	*end++ = ',';
	*end++ = '\'';
	end += mysql_real_escape_string(conn, end, ceinfo, strlen(ceinfo));
	*end++ = '\'';
	*end++ = ')';
	*end = 0;
	//      printf("%s\n",ceinfo);
	if (mysql_real_query(conn, sql, end - sql))
		printf("%s\n", mysql_error(conn));
	fclose(fp);
}
// urlencoded function copied from http://www.geekhideout.com/urlcode.shtml
/* Converts a hex character to its integer value */
char from_hex(char ch) {
	return isdigit(ch) ? ch - '0' : tolower(ch) - 'a' + 10;
}

/* Converts an integer value to its hex character*/
char to_hex(char code) {
	static char hex[] = "0123456789abcdef";
	return hex[code & 15];
}

/* Returns a url-encoded version of str */
/* IMPORTANT: be sure to free() the returned string after use */
char *url_encode(char *str) {
	char *pstr = str, *buf = (char *) malloc(strlen(str) * 3 + 1), *pbuf = buf;
	while (*pstr) {
		if (isalnum(*pstr) || *pstr == '-' || *pstr == '_' || *pstr == '.'
				|| *pstr == '~')
			*pbuf++ = *pstr;
		else if (*pstr == ' ')
			*pbuf++ = '+';
		else
			*pbuf++ = '%', *pbuf++ = to_hex(*pstr >> 4), *pbuf++ = to_hex(
					*pstr & 15);
		pstr++;
	}
	*pbuf = '\0';
	return buf;
}

void _addceinfo_http(int solution_id) {

	char ceinfo[(1 << 16)], *cend;
	char * ceinfo_encode;
	FILE *fp = fopen("ce.txt", "r");

	cend = ceinfo;
	while (fgets(cend, 1024, fp)) {
		cend += strlen(cend);
		if (cend - ceinfo > 40000)
			break;
	}
	fclose(fp);
	ceinfo_encode = url_encode(ceinfo);
	FILE * ce = fopen("ce.post", "w");
	fprintf(ce, "addceinfo=1&sid=%d&ceinfo=%s", solution_id, ceinfo_encode);
	fclose(ce);
	free(ceinfo_encode);

	const char * cmd =
			" wget --post-file=\"ce.post\" --load-cookies=cookie --save-cookies=cookie --keep-session-cookies -q -O - \"%s/admin/problem_judge.php\"";
	FILE * fjobs = read_cmd_output(cmd, http_baseurl);
	//fscanf(fjobs,"%d",&ret);
	pclose(fjobs);

}
void addceinfo(int solution_id) {
	if (http_judge) {
		_addceinfo_http(solution_id);
	} else {
		_addceinfo_mysql(solution_id);
	}
}
/* write runtime error message back to database */
void _addreinfo_mysql(int solution_id, const char * filename) {
	char sql[(1 << 16)], *end;
	char reinfo[(1 << 16)], *rend;
	FILE *fp = fopen(filename, "r");
	snprintf(sql, (1 << 16) - 1, "DELETE FROM runtimeinfo WHERE solution_id=%d",
			solution_id);
	mysql_real_query(conn, sql, strlen(sql));
	rend = reinfo;
	while (fgets(rend, 1024, fp)) {
		rend += strlen(rend);
		if (rend - reinfo > 40000)
			break;
	}
	rend = 0;
	end = sql;
	strcpy(end, "INSERT INTO runtimeinfo VALUES(");
	end += strlen(sql);
	*end++ = '\'';
	end += sprintf(end, "%d", solution_id);
	*end++ = '\'';
	*end++ = ',';
	*end++ = '\'';
	end += mysql_real_escape_string(conn, end, reinfo, strlen(reinfo));
	*end++ = '\'';
	*end++ = ')';
	*end = 0;
	//      printf("%s\n",ceinfo);
	if (mysql_real_query(conn, sql, end - sql))
		printf("%s\n", mysql_error(conn));
	fclose(fp);
}

void _addreinfo_http(int solution_id, const char * filename) {

	char reinfo[(1 << 16)], *rend;
	char * reinfo_encode;
	FILE *fp = fopen(filename, "r");

	rend = reinfo;
	while (fgets(rend, 1024, fp)) {
		rend += strlen(rend);
		if (rend - reinfo > 40000)
			break;
	}
	fclose(fp);
	reinfo_encode = url_encode(reinfo);
	FILE * re = fopen("re.post", "w");
	fprintf(re, "addreinfo=1&sid=%d&reinfo=%s", solution_id, reinfo_encode);
	fclose(re);
	free(reinfo_encode);

	const char * cmd =
			" wget --post-file=\"re.post\" --load-cookies=cookie --save-cookies=cookie --keep-session-cookies -q -O - \"%s/admin/problem_judge.php\"";
	FILE * fjobs = read_cmd_output(cmd, http_baseurl);
	//fscanf(fjobs,"%d",&ret);
	pclose(fjobs);

}
void addreinfo(int solution_id) {
	if (http_judge) {
		_addreinfo_http(solution_id, "error.out");
	} else {
		_addreinfo_mysql(solution_id, "error.out");
	}
}

void adddiffinfo(int solution_id) {

	if (http_judge) {
		_addreinfo_http(solution_id, "diff.out");
	} else {
		_addreinfo_mysql(solution_id, "diff.out");
	}
}
void addcustomout(int solution_id) {

	if (http_judge) {
		_addreinfo_http(solution_id, "user.out");
	} else {
		_addreinfo_mysql(solution_id, "user.out");
	}
}

void _update_user_mysql(char * user_id) {
	char sql[BUFFER_SIZE];
	sprintf(sql,
			"UPDATE `users` SET `solved`=(SELECT count(DISTINCT `problem_id`) FROM `solution` WHERE `user_id`=\'%s\' AND `result`=\'4\') WHERE `user_id`=\'%s\'",
			user_id, user_id);
	if (mysql_real_query(conn, sql, strlen(sql)))
		write_log(mysql_error(conn));
	sprintf(sql,
			"UPDATE `users` SET `submit`=(SELECT count(*) FROM `solution` WHERE `user_id`=\'%s\') WHERE `user_id`=\'%s\'",
			user_id, user_id);
	if (mysql_real_query(conn, sql, strlen(sql)))
		write_log(mysql_error(conn));
}
void _update_user_http(char * user_id) {

	const char * cmd =
			" wget --post-data=\"updateuser=1&user_id=%s\" --load-cookies=cookie --save-cookies=cookie --keep-session-cookies -q -O - \"%s/admin/problem_judge.php\"";
	FILE * fjobs = read_cmd_output(cmd, user_id, http_baseurl);
	//fscanf(fjobs,"%d",&ret);
	pclose(fjobs);
}
void update_user(char * user_id) {
	if (http_judge) {
		_update_user_http(user_id);
	} else {
		_update_user_mysql(user_id);
	}
}

void _update_problem_http(int pid) {
	const char * cmd =
			" wget --post-data=\"updateproblem=1&pid=%d\" --load-cookies=cookie --save-cookies=cookie --keep-session-cookies -q -O - \"%s/admin/problem_judge.php\"";
	FILE * fjobs = read_cmd_output(cmd, pid, http_baseurl);
	//fscanf(fjobs,"%d",&ret);
	pclose(fjobs);
}
void _update_problem_mysql(int p_id) {
	char sql[BUFFER_SIZE];
	sprintf(sql,
			"UPDATE `problem` SET `accepted`=(SELECT count(*) FROM `solution` WHERE `problem_id`=\'%d\' AND `result`=\'4\') WHERE `problem_id`=\'%d\'",
			p_id, p_id);
	if (mysql_real_query(conn, sql, strlen(sql)))
		write_log(mysql_error(conn));
	sprintf(sql,
			"UPDATE `problem` SET `submit`=(SELECT count(*) FROM `solution` WHERE `problem_id`=\'%d\') WHERE `problem_id`=\'%d\'",
			p_id, p_id);
	if (mysql_real_query(conn, sql, strlen(sql)))
		write_log(mysql_error(conn));
}
void update_problem(int pid) {
	if (http_judge) {
		_update_problem_http(pid);
	} else {
		_update_problem_mysql(pid);
	}
}


//核心原始碼之一，編譯程式
//輸入：程式語言型別編碼lang 
//返回值：編譯成功返回0；失敗返回ce.txt檔案大小 
int compile(int lang) {
	int pid;
	//設定編譯命令 
	const char * CP_C[] = { "gcc", "Main.c", "-o", "Main", "-fno-asm", "-Wall",
			"-lm", "--static", "-std=c99", "-DONLINE_JUDGE", NULL };
	const char * CP_X[] = { "g++", "Main.cc", "-o", "Main", "-fno-asm", "-Wall",
			"-lm", "--static", "-std=c++0x", "-DONLINE_JUDGE", NULL };
	const char * CP_P[] =
			{ "fpc", "Main.pas", "-O2", "-Co", "-Ct", "-Ci", NULL };
//      const char * CP_J[] = { "javac", "-J-Xms32m", "-J-Xmx256m","-encoding","UTF-8", "Main.java",NULL };

	const char * CP_R[] = { "ruby", "-c", "Main.rb", NULL };
	const char * CP_B[] = { "chmod", "+rx", "Main.sh", NULL };
	const char * CP_Y[] = { "python", "-c",
			"import py_compile; py_compile.compile(r'Main.py')", NULL };
	const char * CP_PH[] = { "php", "-l", "Main.php", NULL };
	const char * CP_PL[] = { "perl", "-c", "Main.pl", NULL };
	const char * CP_CS[] = { "gmcs", "-warn:0", "Main.cs", NULL };
	const char * CP_OC[] = { "gcc", "-o", "Main", "Main.m",
			"-fconstant-string-class=NSConstantString", "-I",
			"/usr/include/GNUstep/", "-L", "/usr/lib/GNUstep/Libraries/",
			"-lobjc", "-lgnustep-base", NULL };
	const char * CP_BS[] = { "fbc", "Main.bas", NULL };
	char javac_buf[7][16];
	char *CP_J[7];

	for (int i = 0; i < 7; i++)
		CP_J[i] = javac_buf[i];

	sprintf(CP_J[0], "javac");
	sprintf(CP_J[1], "-J%s", java_xms);
	sprintf(CP_J[2], "-J%s", java_xmx);
	sprintf(CP_J[3], "-encoding");
	sprintf(CP_J[4], "UTF-8");
	sprintf(CP_J[5], "Main.java");
	CP_J[6] = (char *) NULL;

	//判題程序中又建立子程序	 
	pid = fork();
	if (pid == 0) {//如果是子程序在執行
	//設定執行資源限制 
		struct rlimit LIM;
		LIM.rlim_max = 60;
		LIM.rlim_cur = 60;
		setrlimit(RLIMIT_CPU, &LIM);
		alarm(60);
		LIM.rlim_max = 100 * STD_MB;
		LIM.rlim_cur = 100 * STD_MB;
		setrlimit(RLIMIT_FSIZE, &LIM);

		if(lang==3){
		   LIM.rlim_max = STD_MB << 11;
		   LIM.rlim_cur = STD_MB << 11;	
                }else{
		   LIM.rlim_max = STD_MB << 10;
		   LIM.rlim_cur = STD_MB << 10;
		}
		setrlimit(RLIMIT_AS, &LIM);
		//實現重定向，把預定義的標準流檔案定向到由path指定的檔案中。
		//標準流檔案具體是指stdin、stdout和stderr 
		if (lang != 2 && lang != 11) {//不是pas也不是bas
			freopen("ce.txt", "w", stderr);
			//freopen("/dev/null", "w", stdout);
		} else {//如果是bas或者pas,那麼編譯資訊輸出重定向到ce.txt  
			freopen("ce.txt", "w", stdout);
		}
		//將/home/judge/run0下所有檔案擁有者改為判題使用者judge可能為了安全考慮？？？？？？ 
		/*	
		可以這樣使用 stuid() 函式：
開始時，某個程式需要 root 許可權玩成一些工作，但後續的工作不需要 root 許可權。
可以將該可執行程式檔案設定 set_uid 位，並使得該檔案的屬主為 root。
這樣，普通使用者執行這個程式時，程序就具有了 root 許可權，當不再需要 root 許可權時，
呼叫 setuid( getuid() ) 恢復程序的實際使用者 ID 和有效使用者 ID 為執行該程式的普通使用者的 ID 。
對於一些提供網路服務的程式，這樣做是非常有必要的，否則就可能被攻擊者利用，使攻擊者控制整個系統。
對於設定了 set_uid 位的可執行程式也要注意，尤其是對那些屬主是 root 的更要注意。因為 Linux 系統中 
root 使用者擁有最高權力。黑客們往往喜歡尋找設定了 set_uid 位的可執行程式的漏洞。這樣的程式如果存在緩衝區溢位
漏洞，並且該程式是一個網路程式，那麼黑客就可以從遠端的地方輕鬆地利用該漏洞獲得執行該漏洞程式的主機的 root
 許可權。即使這樣的成不是網路程式，那麼也可以使本機上的惡意普通使用者提升為 root 許可權。
 		*/ 
		execute_cmd("chown judge *");
		while(setgid(1536)!=0) sleep(1);
        while(setuid(1536)!=0) sleep(1);
        while(setresuid(1536, 1536, 1536)!=0) sleep(1);

		//執行編譯命令，並且輸出到ce.txt中
		//預設c:0-c++:1 
		/*
		execvp()會從PATH 環境變數所指的目錄中查詢符合引數file 的檔名，找到後便執行該檔案，
		然後將第二個引數argv傳給該欲執行的檔案。
		返回值：如果執行成功則函式不會返回，執行失敗則直接返回-1，失敗原因存於errno中。
		*/
		switch (lang) {
		case 0:
			execvp(CP_C[0], (char * const *) CP_C);
			break;
		case 1:
			execvp(CP_X[0], (char * const *) CP_X);
			break;
		case 2:
			execvp(CP_P[0], (char * const *) CP_P);
			break;
		case 3:
			execvp(CP_J[0], (char * const *) CP_J);
			break;
		case 4:
			execvp(CP_R[0], (char * const *) CP_R);
			break;
		case 5:
			execvp(CP_B[0], (char * const *) CP_B);
			break;
		case 6:
			execvp(CP_Y[0], (char * const *) CP_Y);
			break;
		case 7:
			execvp(CP_PH[0], (char * const *) CP_PH);
			break;
		case 8:
			execvp(CP_PL[0], (char * const *) CP_PL);
			break;
		case 9:
			execvp(CP_CS[0], (char * const *) CP_CS);
			break;

		case 10:
			execvp(CP_OC[0], (char * const *) CP_OC);
			break;
		case 11:
			execvp(CP_BS[0], (char * const *) CP_BS);
			break;
		default:
			printf("nothing to do!\n");
		}
		//如果除錯，在這裡輸出編譯資訊，
		if (DEBUG)
			printf("compile end!\n");
		
		//並終止編譯子程序的執行 ，這裡提供了兩種返回父程序的方式
		//一種是檢視ce檔案，是否進行分析？？？？
		//另一種是直接exit(0);這裡可能預設編譯子程序一定成功？？？？？ 
		//exit(!system("cat ce.txt"));		
		exit(0);
	} else {//父程序，等待編譯子程序的執行 結束，正常結束帶回0，為什麼採取這種形式？？？難道是不知道什麼時候
	//編譯結束？？？？不知道什麼時候去讀取ce.txt進行解析？？？所以採用父子程序的方式？？？ 
	//如果子程序編譯有語法錯誤，那麼會寫入ce.txt，如果ce.txt為0，並且是Exit(0)，代表子程序正常退出，編譯成功 
		int status = 0;
		//一直等，直到編譯子程序結束 
		waitpid(pid, &status, 0);
		if (lang > 3 && lang < 7)//"rb", "sh", "py"這三種語言狀態特殊？？？？ 
			status = get_file_size("ce.txt"); //那c如果有錯誤寫入ce.txt呢？？？？ 
		if (DEBUG)
			printf("status=%d\n", status);
		return status;//預設返回0 
	}

}
/*
 int read_proc_statm(int pid){
 FILE * pf;
 char fn[4096];
 int ret;
 sprintf(fn,"/proc/%d/statm",pid);
 pf=fopen(fn,"r");
 fscanf(pf,"%d",&ret);
 fclose(pf);
 return ret;
 }
 */
int get_proc_status(int pid, const char * mark) {
	FILE * pf;
	char fn[BUFFER_SIZE], buf[BUFFER_SIZE];
	int ret = 0;
	sprintf(fn, "/proc/%d/status", pid);
	pf = fopen(fn, "r");
	int m = strlen(mark);
	while (pf && fgets(buf, BUFFER_SIZE - 1, pf)) {

		buf[strlen(buf) - 1] = 0;
		if (strncmp(buf, mark, m) == 0) {
			sscanf(buf + m + 1, "%d", &ret);
		}
	}
	if (pf)
		fclose(pf);
	return ret;
}
int init_mysql_conn() {

	conn = mysql_init(NULL);
	//mysql_real_connect(conn,host_name,user_name,password,db_name,port_number,0,0);
	const char timeout = 30;
	mysql_options(conn, MYSQL_OPT_CONNECT_TIMEOUT, &timeout);

	if (!mysql_real_connect(conn, host_name, user_name, password, db_name,
			port_number, 0, 0)) {
		write_log("%s", mysql_error(conn));
		return 0;
	}
	const char * utf8sql = "set names utf8";
	if (mysql_real_query(conn, utf8sql, strlen(utf8sql))) {
		write_log("%s", mysql_error(conn));
		return 0;
	}
	return 1;
}

//根據情況讀取待評測程式原始碼
//並在預設目錄work_dir : /home/judge/run0下建立 Main.c 
void _get_solution_mysql(int solution_id, char * work_dir, int lang) {
	char sql[BUFFER_SIZE], src_pth[BUFFER_SIZE];
	// get the source code
	MYSQL_RES *res;
	MYSQL_ROW row;
	sprintf(sql, "SELECT source FROM source_code WHERE solution_id=%d",
			solution_id);
	mysql_real_query(conn, sql, strlen(sql));
	res = mysql_store_result(conn);
	row = mysql_fetch_row(res);

	// create the src file
	sprintf(src_pth, "Main.%s", lang_ext[lang]);
	if (DEBUG)
		printf("Main=%s", src_pth);
	FILE *fp_src = fopen(src_pth, "w");
	fprintf(fp_src, "%s", row[0]);
	mysql_free_result(res);
	fclose(fp_src);
}
void _get_solution_http(int solution_id, char * work_dir, int lang) {
	char src_pth[BUFFER_SIZE];

	// create the src file
	sprintf(src_pth, "Main.%s", lang_ext[lang]);
	if (DEBUG)
		printf("Main=%s", src_pth);

	//login();

	const char * cmd2 =
			"wget --post-data=\"getsolution=1&sid=%d\" --load-cookies=cookie --save-cookies=cookie --keep-session-cookies -q -O %s \"%s/admin/problem_judge.php\"";
	FILE * pout = read_cmd_output(cmd2, solution_id, src_pth, http_baseurl);

	pclose(pout);

}
void get_solution(int solution_id, char * work_dir, int lang) {
	if (http_judge) {
		_get_solution_http(solution_id, work_dir, lang);
	} else {
		_get_solution_mysql(solution_id, work_dir, lang);
	}

}

void _get_custominput_mysql(int solution_id, char * work_dir) {
	char sql[BUFFER_SIZE], src_pth[BUFFER_SIZE];
	// get the source code
	MYSQL_RES *res;
	MYSQL_ROW row;
	sprintf(sql, "SELECT input_text FROM custominput WHERE solution_id=%d",
			solution_id);
	mysql_real_query(conn, sql, strlen(sql));
	res = mysql_store_result(conn);
	row = mysql_fetch_row(res);
	if (row != NULL) {

		// create the src file
		sprintf(src_pth, "data.in");
		FILE *fp_src = fopen(src_pth, "w");
		fprintf(fp_src, "%s", row[0]);
		fclose(fp_src);

	}
	mysql_free_result(res);
}
void _get_custominput_http(int solution_id, char * work_dir) {
	char src_pth[BUFFER_SIZE];

	// create the src file
	sprintf(src_pth, "data.in");

	//login();

	const char * cmd2 =
			"wget --post-data=\"getcustominput=1&sid=%d\" --load-cookies=cookie --save-cookies=cookie --keep-session-cookies -q -O %s \"%s/admin/problem_judge.php\"";
	FILE * pout = read_cmd_output(cmd2, solution_id, src_pth, http_baseurl);

	pclose(pout);

}
void get_custominput(int solution_id, char * work_dir) {
	if (http_judge) {
		_get_custominput_http(solution_id, work_dir);
	} else {
		_get_custominput_mysql(solution_id, work_dir);
	}
}

void _get_solution_info_mysql(int solution_id, int & p_id, char * user_id,
		int & lang) {

	MYSQL_RES *res;
	MYSQL_ROW row;

	char sql[BUFFER_SIZE];
	// get the problem id and user id from Table:solution
	sprintf(sql,
			"SELECT problem_id, user_id, language FROM solution where solution_id=%d",
			solution_id);
	//printf("%s\n",sql);
	mysql_real_query(conn, sql, strlen(sql));
	res = mysql_store_result(conn);
	row = mysql_fetch_row(res);
	p_id = atoi(row[0]);
	strcpy(user_id, row[1]);
	lang = atoi(row[2]);
	mysql_free_result(res);
}

void _get_solution_info_http(int solution_id, int & p_id, char * user_id,
		int & lang) {

	login();

	const char * cmd =
			"wget --post-data=\"getsolutioninfo=1&sid=%d\" --load-cookies=cookie --save-cookies=cookie --keep-session-cookies -q -O - \"%s/admin/problem_judge.php\"";
	FILE * pout = read_cmd_output(cmd, solution_id, http_baseurl);
	fscanf(pout, "%d", &p_id);
	fscanf(pout, "%s", user_id);
	fscanf(pout, "%d", &lang);
	pclose(pout);

}
void get_solution_info(int solution_id, int & p_id, char * user_id,
		int & lang) {

	if (http_judge) {
		_get_solution_info_http(solution_id, p_id, user_id, lang);
	} else {
		_get_solution_info_mysql(solution_id, p_id, user_id, lang);
	}
}

void _get_problem_info_mysql(int p_id, int & time_lmt, int & mem_lmt,
		int & isspj) {
	// get the problem info from Table:problem
	char sql[BUFFER_SIZE];
	MYSQL_RES *res;
	MYSQL_ROW row;
	sprintf(sql,
			"SELECT time_limit,memory_limit,spj FROM problem where problem_id=%d",
			p_id);
	mysql_real_query(conn, sql, strlen(sql));
	res = mysql_store_result(conn);
	row = mysql_fetch_row(res);
	time_lmt = atoi(row[0]);
	mem_lmt = atoi(row[1]);
	isspj = (row[2][0] == '1');
	mysql_free_result(res);
}

void _get_problem_info_http(int p_id, int & time_lmt, int & mem_lmt,
		int & isspj) {
	//login();

	const char * cmd =
			"wget --post-data=\"getprobleminfo=1&pid=%d\" --load-cookies=cookie --save-cookies=cookie --keep-session-cookies -q -O - \"%s/admin/problem_judge.php\"";
	FILE * pout = read_cmd_output(cmd, p_id, http_baseurl);
	fscanf(pout, "%d", &time_lmt);
	fscanf(pout, "%d", &mem_lmt);
	fscanf(pout, "%d", &isspj);
	pclose(pout);
}

void get_problem_info(int p_id, int & time_lmt, int & mem_lmt, int & isspj) {
	if (http_judge) {
		_get_problem_info_http(p_id, time_lmt, mem_lmt, isspj);
	} else {
		_get_problem_info_mysql(p_id, time_lmt, mem_lmt, isspj);
	}
}

/*
功能：
	1、把評測的輸入資料複製到/home/judge/run0/data.in
	2、給outfile 賦值； /home/judge/data/1000/fname.out
	3、給userfile 賦值： /home/judge/ruun0/user.out 
輸入：
	filename: 輸入資料檔名稱 不包括副檔名.in 如sample / test
	namelen:  輸入資料檔案主名長度 sample:6 test:4
	infile : char * infile[] 在main()中定義，儲存完整測試資料路徑：/home/judge/data/1000/sample.in 或 /home/judge/data/1000/test.in
	p_id   : 問題編號
	work_dir: 預設的評測程序路徑 /home/judge/run0
	outfile: char * outfile[] 在main()中定義，儲存完整正確結果資料路徑：/home/judge/data/1000/ sample.out或/home/judge/data/1000/test.out
	userfile:char* userfile[] 在main()中定義，儲存完整 使用者程式結果資料路徑：/home/judge/run0/user.out
	runner_id: 判題程序編號run0 run1 run2 run3 取值0-max_running-1 
	 
輸出：
    無 
註釋：
    2014-11-4 17:00 by ghf in HNSSYZX ZhengZhou  
*/ 
/*
在 int main()中呼叫： 
prepare_files(dirp->d_name, namelen, infile, p_id, work_dir, outfile,
				userfile, runner_id);
*/
void prepare_files(char * filename, int namelen, char * infile, int & p_id,
		char * work_dir, char * outfile, char * userfile, int runner_id) {
	//              printf("ACflg=%d %d check a file!\n",ACflg,solution_id);

	char fname[BUFFER_SIZE];
	strncpy(fname, filename, namelen);//儲存測試資料主名 
	fname[namelen] = 0;//c字串末尾\0結尾 
	sprintf(infile, "%s/data/%d/%s.in", oj_home, p_id, fname);//測試資料完整路徑 
	execute_cmd("/bin/cp %s %s/data.in", infile, work_dir);//複製測試資料到run0目錄下 
	execute_cmd("/bin/cp %s/data/%d/*.dic %s/", oj_home, p_id, work_dir);//dic資料複製？？？？ 

	sprintf(outfile, "%s/data/%d/%s.out", oj_home, p_id, fname);
	sprintf(userfile, "%s/run%d/user.out", oj_home, runner_id);
}

void copy_shell_runtime(char * work_dir) {

	execute_cmd("/bin/mkdir %s/lib", work_dir);
	execute_cmd("/bin/mkdir %s/lib64", work_dir);
	execute_cmd("/bin/mkdir %s/bin", work_dir);
	execute_cmd("/bin/cp /lib/* %s/lib/", work_dir);
	execute_cmd("/bin/cp -a /lib/i386-linux-gnu %s/lib/", work_dir);
	execute_cmd("/bin/cp -a /lib/x86_64-linux-gnu %s/lib/", work_dir);
	execute_cmd("/bin/cp /lib64/* %s/lib64/", work_dir);
	execute_cmd("/bin/cp -a /lib32 %s/", work_dir);
	execute_cmd("/bin/cp /bin/busybox %s/bin/", work_dir);
	execute_cmd("/bin/ln -s /bin/busybox %s/bin/sh", work_dir);
	execute_cmd("/bin/cp /bin/bash %s/bin/bash", work_dir);

}
void copy_objc_runtime(char * work_dir) {
	copy_shell_runtime(work_dir);
	execute_cmd("/bin/mkdir -p %s/proc", work_dir);
	execute_cmd("/bin/mount -o bind /proc %s/proc", work_dir);
	execute_cmd("/bin/mkdir -p %s/lib/", work_dir);
	execute_cmd(
			"/bin/cp -aL /lib/libdbus-1.so.3                          %s/lib/ ",
			work_dir);
	execute_cmd(
			"/bin/cp -aL /lib/libgcc_s.so.1                           %s/lib/ ",
			work_dir);
	execute_cmd(
			"/bin/cp -aL /lib/libgcrypt.so.11                         %s/lib/ ",
			work_dir);
	execute_cmd(
			"/bin/cp -aL /lib/libgpg-error.so.0                       %s/lib/ ",
			work_dir);
	execute_cmd(
			"/bin/cp -aL /lib/libz.so.1                               %s/lib/ ",
			work_dir);
	execute_cmd(
			"/bin/cp -aL /lib/tls/i686/cmov/libc.so.6                 %s/lib/ ",
			work_dir);
	execute_cmd(
			"/bin/cp -aL /lib/tls/i686/cmov/libdl.so.2                %s/lib/ ",
			work_dir);
	execute_cmd(
			"/bin/cp -aL /lib/tls/i686/cmov/libm.so.6                 %s/lib/ ",
			work_dir);
	execute_cmd(
			"/bin/cp -aL /lib/tls/i686/cmov/libnsl.so.1               %s/lib/ ",
			work_dir);
	execute_cmd(
			"/bin/cp -aL /lib/tls/i686/cmov/libpthread.so.0           %s/lib/ ",
			work_dir);
	execute_cmd(
			"/bin/cp -aL /lib/tls/i686/cmov/librt.so.1                %s/lib/ ",
			work_dir);
	execute_cmd(
			"/bin/cp -aL /usr/lib/libavahi-client.so.3                %s/lib/ ",
			work_dir);
	execute_cmd(
			"/bin/cp -aL /usr/lib/libavahi-common.so.3                %s/lib/ ",
			work_dir);
	execute_cmd(
			"/bin/cp -aL /usr/lib/libdns_sd.so.1                      %s/lib/ ",
			work_dir);
	execute_cmd(
			"/bin/cp -aL /usr/lib/libffi.so.5                         %s/lib/ ",
			work_dir);
	execute_cmd(
			"/bin/cp -aL /usr/lib/libgnustep-base.so.1.19             %s/lib/ ",
			work_dir);
	execute_cmd(
			"/bin/cp -aL /usr/lib/libgnutls.so.26                     %s/lib/ ",
			work_dir);
	execute_cmd(
			"/bin/cp -aL /usr/lib/libobjc.so.2                        %s/lib/ ",
			work_dir);
	execute_cmd(
			"/bin/cp -aL /usr/lib/libtasn1.so.3                       %s/lib/ ",
			work_dir);
	execute_cmd(
			"/bin/cp -aL /usr/lib/libxml2.so.2                        %s/lib/ ",
			work_dir);
	execute_cmd(
			"/bin/cp -aL /usr/lib/libxslt.so.1                        %s/lib/ ",
			work_dir);

}
void copy_bash_runtime(char * work_dir) {
	//char cmd[BUFFER_SIZE];
	//const char * ruby_run="/usr/bin/ruby";
	copy_shell_runtime(work_dir);
	execute_cmd("/bin/cp `which bc`  %s/bin/", work_dir);
	execute_cmd("busybox dos2unix Main.sh", work_dir);
	execute_cmd("/bin/ln -s /bin/busybox %s/bin/grep", work_dir);
	execute_cmd("/bin/ln -s /bin/busybox %s/bin/awk", work_dir);
	execute_cmd("/bin/cp /bin/sed %s/bin/sed", work_dir);
	execute_cmd("/bin/ln -s /bin/busybox %s/bin/cut", work_dir);
	execute_cmd("/bin/ln -s /bin/busybox %s/bin/sort", work_dir);
	execute_cmd("/bin/ln -s /bin/busybox %s/bin/join", work_dir);
	execute_cmd("/bin/ln -s /bin/busybox %s/bin/wc", work_dir);
	execute_cmd("/bin/ln -s /bin/busybox %s/bin/tr", work_dir);
	execute_cmd("/bin/ln -s /bin/busybox %s/bin/dc", work_dir);
	execute_cmd("/bin/ln -s /bin/busybox %s/bin/dd", work_dir);
	execute_cmd("/bin/ln -s /bin/busybox %s/bin/cat", work_dir);
	execute_cmd("/bin/ln -s /bin/busybox %s/bin/tail", work_dir);
	execute_cmd("/bin/ln -s /bin/busybox %s/bin/head", work_dir);
	execute_cmd("/bin/ln -s /bin/busybox %s/bin/xargs", work_dir);
	execute_cmd("chmod +rx %s/Main.sh", work_dir);

}
void copy_ruby_runtime(char * work_dir) {

	copy_shell_runtime(work_dir);
	execute_cmd("/bin/mkdir %s/usr", work_dir);
	execute_cmd("/bin/mkdir %s/usr/lib", work_dir);
	execute_cmd("/bin/cp /usr/lib/libruby* %s/usr/lib/", work_dir);
	execute_cmd("/bin/cp -a /usr/lib/ruby %s/usr/lib/", work_dir);
	execute_cmd("/bin/cp /usr/bin/ruby* %s/", work_dir);

}
void copy_guile_runtime(char * work_dir) {

	copy_shell_runtime(work_dir);
	execute_cmd("/bin/mkdir -p %s/proc", work_dir);
	execute_cmd("/bin/mount -o bind /proc %s/proc", work_dir);
	execute_cmd("/bin/mkdir -p %s/usr/lib", work_dir);
	execute_cmd("/bin/mkdir -p %s/usr/share", work_dir);
	execute_cmd("/bin/cp -a /usr/share/guile %s/usr/share/", work_dir);
	execute_cmd("/bin/cp /usr/lib/libguile* %s/usr/lib/", work_dir);
	execute_cmd("/bin/cp /usr/lib/libgc* %s/usr/lib/", work_dir);
	execute_cmd("/bin/cp /usr/lib/i386-linux-gnu/libffi* %s/usr/lib/",
			work_dir);
	execute_cmd("/bin/cp /usr/lib/i386-linux-gnu/libunistring* %s/usr/lib/",
			work_dir);
	execute_cmd("/bin/cp /usr/lib/*/libgmp* %s/usr/lib/", work_dir);
	execute_cmd("/bin/cp /usr/lib/libgmp* %s/usr/lib/", work_dir);
	execute_cmd("/bin/cp /usr/lib/*/libltdl* %s/usr/lib/", work_dir);
	execute_cmd("/bin/cp /usr/lib/libltdl* %s/usr/lib/", work_dir);
	execute_cmd("/bin/cp /usr/bin/guile* %s/", work_dir);

}

void copy_python_runtime(char * work_dir) {

	copy_shell_runtime(work_dir);
	execute_cmd("/bin/mkdir -p %s/usr/include", work_dir);
	execute_cmd("/bin/mkdir -p %s/usr/lib", work_dir);
	execute_cmd("/bin/cp /usr/bin/python* %s/", work_dir);
	execute_cmd("/bin/cp -a /usr/lib/python* %s/usr/lib/", work_dir);
	execute_cmd("/bin/cp -a /usr/include/python* %s/usr/include/", work_dir);
	execute_cmd("/bin/cp -a /usr/lib/libpython* %s/usr/lib/", work_dir);

}
void copy_php_runtime(char * work_dir) {

	copy_shell_runtime(work_dir);
	execute_cmd("/bin/mkdir %s/usr", work_dir);
	execute_cmd("/bin/mkdir %s/usr/lib", work_dir);
	execute_cmd("/bin/cp /usr/lib/libedit* %s/usr/lib/", work_dir);
	execute_cmd("/bin/cp /usr/lib/libdb* %s/usr/lib/", work_dir);
	execute_cmd("/bin/cp /usr/lib/libgssapi_krb5* %s/usr/lib/", work_dir);
	execute_cmd("/bin/cp /usr/lib/libkrb5* %s/usr/lib/", work_dir);
	execute_cmd("/bin/cp /usr/lib/libk5crypto* %s/usr/lib/", work_dir);
	execute_cmd("/bin/cp /usr/lib/*/libedit* %s/usr/lib/", work_dir);
	execute_cmd("/bin/cp /usr/lib/*/libdb* %s/usr/lib/", work_dir);
	execute_cmd("/bin/cp /usr/lib/*/libgssapi_krb5* %s/usr/lib/", work_dir);
	execute_cmd("/bin/cp /usr/lib/*/libkrb5* %s/usr/lib/", work_dir);
	execute_cmd("/bin/cp /usr/lib/*/libk5crypto* %s/usr/lib/", work_dir);
	execute_cmd("/bin/cp /usr/lib/libxml2* %s/usr/lib/", work_dir);
	execute_cmd("/bin/cp /usr/lib/x86_64-linux-gnu/libxml2.so* %s/usr/lib/",
			work_dir);
	execute_cmd("/bin/cp /usr/bin/php* %s/", work_dir);
	execute_cmd("chmod +rx %s/Main.php", work_dir);

}
void copy_perl_runtime(char * work_dir) {

	copy_shell_runtime(work_dir);
	execute_cmd("/bin/mkdir %s/usr", work_dir);
	execute_cmd("/bin/mkdir %s/usr/lib", work_dir);
	execute_cmd("/bin/cp /usr/lib/libperl* %s/usr/lib/", work_dir);
	execute_cmd("/bin/cp /usr/bin/perl* %s/", work_dir);

}
void copy_freebasic_runtime(char * work_dir) {

	copy_shell_runtime(work_dir);
	execute_cmd("/bin/mkdir -p %s/usr/local/lib", work_dir);
	execute_cmd("/bin/mkdir -p %s/usr/local/bin", work_dir);
	execute_cmd("/bin/cp /usr/local/lib/freebasic %s/usr/local/lib/", work_dir);
	execute_cmd("/bin/cp /usr/local/bin/fbc %s/", work_dir);
	execute_cmd("/bin/cp -a /lib32/* %s/lib/", work_dir);

}
void copy_mono_runtime(char * work_dir) {

	copy_shell_runtime(work_dir);
	execute_cmd("/bin/mkdir %s/usr", work_dir);
	execute_cmd("/bin/mkdir %s/proc", work_dir);
	execute_cmd("/bin/mkdir -p %s/usr/lib/mono/2.0", work_dir);
	execute_cmd("/bin/cp -a /usr/lib/mono %s/usr/lib/", work_dir);
	execute_cmd("/bin/mkdir -p %s/usr/lib64/mono/2.0", work_dir);
	execute_cmd("/bin/cp -a /usr/lib64/mono %s/usr/lib64/", work_dir);

	execute_cmd("/bin/cp /usr/lib/libgthread* %s/usr/lib/", work_dir);

	execute_cmd("/bin/mount -o bind /proc %s/proc", work_dir);
	execute_cmd("/bin/cp /usr/bin/mono* %s/", work_dir);

	execute_cmd("/bin/cp /usr/lib/libgthread* %s/usr/lib/", work_dir);
	execute_cmd("/bin/cp /lib/libglib* %s/lib/", work_dir);
	execute_cmd("/bin/cp /lib/tls/i686/cmov/lib* %s/lib/tls/i686/cmov/",
			work_dir);
	execute_cmd("/bin/cp /lib/libpcre* %s/lib/", work_dir);
	execute_cmd("/bin/cp /lib/ld-linux* %s/lib/", work_dir);
	execute_cmd("/bin/cp /lib64/ld-linux* %s/lib64/", work_dir);
	execute_cmd("/bin/mkdir -p %s/home/judge", work_dir);
	execute_cmd("/bin/chown judge %s/home/judge", work_dir);
	execute_cmd("/bin/mkdir -p %s/etc", work_dir);
	execute_cmd("/bin/grep judge /etc/passwd>%s/etc/passwd", work_dir);

}


/*
功能：
	1、設定資源限制，執行時間、記憶體
	2、設定子程序執行使用者
	3、修改子程序執行根目錄 / 為 run0/
	4、重定向標準輸入輸出為文件
	5、執行程式，生成結果 
輸入：
    lang:       程式語言型別編碼 c:0 c++:1
	work_dir:   判題程序工作目錄：/home/judge/runn0,為當前預設目錄
	time_lmt:   時間限制
	used_time:  執行時間
	mem_lmt:    執行記憶體限制 
輸出：
    無 
呼叫：
    在main()中建立新的執行子程序中呼叫 
    run_solution(lang, work_dir, time_lmt, usedtime, mem_lmt);

註釋： 2014-11-4 17:30 by ghf in HNSSYZX ZhengZhou 

*/
void run_solution(int & lang, char * work_dir, int & time_lmt, int & usedtime,
		int & mem_lmt) {
	/*
	在當前程式執行優先順序基礎之上調整指定值得到新的程式執行優先順序，
	用新的程式執行優先順序執行命令列"command [arguments...]"。優先順序的範圍為-20 ～ 19 等40個等級，
	其中數值越小優先順序越高，數值越大優先順序越低，既-20的優先順序最高， 19的優先順序最低。
	若調整後的程式執行優先順序高於-20，則就以優先順序-20來執行命令列；若調整後的程式執行優先順序低於19，
	則就以優先順序19來執行命令列。若 nice命令未指定優先順序的調整值，則以預設值10來調整程式執行優先順序，
	既在當前程式執行優先順序基礎之上增加10。
	
	調低執行級，基本使用者都能執行成功，將這個執行子程序的優先順序降到最低，為了安全？？？？？？？？？ 
	*/
	nice(19);
	// now the user is "judger"
	//這時的工作目錄分佈： 
	///home/judge/run0/data.in
	///home/judge/run0/Main.exe
	///home/judge/run0/ce.txt
	///home/judge/run0/main.c
	///home/judge/run0/user.out
	///home/judge/run0/error.out
	chdir(work_dir);
	// open the files
	//使輸入輸出重定向到檔案裡，方便最後的評判 
	freopen("data.in", "r", stdin);
	freopen("user.out", "w", stdout);
	freopen("error.out", "a+", stderr);
	// trace me
	/*
	ptrace系統函式。 ptrace提供了一種使父程序得以監視和控制其它程序的方式，
	它還能夠改變子程序中的暫存器和核心映像，因而可以實現斷點除錯和系統呼叫的跟蹤。
	使用ptrace，你可以在使用者層攔截和修改系統呼叫(sys call).
    形式：ptrace(PTRACE_TRACEME,0 ,0 ,0)
    描述：本程序被其父程序所跟蹤。其父程序應該希望跟蹤子程序。
	*/
	ptrace(PTRACE_TRACEME, 0, NULL, NULL);
	// run me	
	/*
	chroot是核心中的一個系統呼叫，軟體可以通過呼叫庫函式chroot，來更改某個程序所能見到的根目錄
	1.限制CHROOT環境下的使用者所能行的程式，如SetUid的程式，或是造成 Load 的 Compiler等等
2.防止使用者存取某些特定檔案及配置檔案，如/etc/passwd
3.防止入侵者/bin/rm -rf /
4.提供Guest服務及限制不守規矩的使用者。
5.增強繫系統的安全。 

安全機制？？？？？？？？？？？？？？？？？
可是chroot 需要root許可權執行啊，不是已經將該程序許可權降低的最低的19了啊 ？？？？？？？？？？？？？？？？ 
	*/
	if (lang != 3) //如果不是java 
		chroot(work_dir);
/*
？？？？？？？？？？？？？？？？？？？？？？？？？？？？？？？？？？？？？？？？ 
這附近的程式碼涉及到的使用者角色和許可權的轉換不是很理解，判題程序建立的執行子程序，難道有root許可權？？？
這裡又把許可權設定到了judge使用者1536 
 ？？？？？？？？？？？？？？？？？？？？？？？？？？？？？？？？？？？？？？？？？？？ 
*/
	while (setgid(1536) != 0)
		sleep(1);
	while (setuid(1536) != 0)
		sleep(1);
	while (setresuid(1536, 1536, 1536) != 0)
		sleep(1);

//      char java_p1[BUFFER_SIZE], java_p2[BUFFER_SIZE];
	// child
	// set the limit
	struct rlimit LIM; // time limit, file limit& memory limit
	// time limit
	//難道oi_mode是秒和毫秒的區別？？？？？？？？？？？？？？？？ 
	//看不懂什麼意思 
	
	//設定執行時間、記憶體限制 
	if (oi_mode)
		LIM.rlim_cur = time_lmt + 1;
	else
		LIM.rlim_cur = (time_lmt - usedtime / 1000) + 1;
	LIM.rlim_max = LIM.rlim_cur;
	//if(DEBUG) printf("LIM_CPU=%d",(int)(LIM.rlim_cur));
	setrlimit(RLIMIT_CPU, &LIM);
	alarm(0);
	alarm(time_lmt * 10);

	// file limit
	LIM.rlim_max = STD_F_LIM + STD_MB;
	LIM.rlim_cur = STD_F_LIM;
	setrlimit(RLIMIT_FSIZE, &LIM);
	// proc limit
	switch (lang) {
	case 3:  //java
	case 12:
		LIM.rlim_cur = LIM.rlim_max = 50;
		break;
	case 5: //bash
		LIM.rlim_cur = LIM.rlim_max = 3;
		break;
	case 9: //C#
		LIM.rlim_cur = LIM.rlim_max = 50;
		break;
	default:
		LIM.rlim_cur = LIM.rlim_max = 1;
	}

	setrlimit(RLIMIT_NPROC, &LIM);

	// set the stack
	LIM.rlim_cur = STD_MB << 6;
	LIM.rlim_max = STD_MB << 6;
	setrlimit(RLIMIT_STACK, &LIM);
	// set the memory
	LIM.rlim_cur = STD_MB * mem_lmt / 2 * 3;
	LIM.rlim_max = STD_MB * mem_lmt * 2;
	if (lang < 3)
		setrlimit(RLIMIT_AS, &LIM);

	//開始真正的執行
	 
	switch (lang) {
	case 0:
	case 1:
	case 2:
	case 10:
	case 11:
		execl("./Main", "./Main", (char *) NULL);//因為已經chroot(/home/judge/run0所以可以./Main) 
		break;
	case 3:
//              sprintf(java_p1, "-Xms%dM", mem_lmt / 2);
//              sprintf(java_p2, "-Xmx%dM", mem_lmt);

		execl("/usr/bin/java", "/usr/bin/java", java_xms, java_xmx,
				"-Djava.security.manager",
				"-Djava.security.policy=./java.policy", "Main", (char *) NULL);
		break;
	case 4:
		//system("/ruby Main.rb<data.in");
		execl("/ruby", "/ruby", "Main.rb", (char *) NULL);
		break;
	case 5: //bash
		execl("/bin/bash", "/bin/bash", "Main.sh", (char *) NULL);
		break;
	case 6: //Python
		execl("/python", "/python", "Main.py", (char *) NULL);
		break;
	case 7: //php
		execl("/php", "/php", "Main.php", (char *) NULL);
		break;
	case 8: //perl
		execl("/perl", "/perl", "Main.pl", (char *) NULL);
		break;
	case 9: //Mono C#
		execl("/mono", "/mono", "--debug", "Main.exe", (char *) NULL);
		break;
	case 12: //guile
		execl("/guile", "/guile", "Main.scm", (char *) NULL);
		break;

	}
	//sleep(1);
	exit(0);
}
int fix_java_mis_judge(char *work_dir, int & ACflg, int & topmemory,
		int mem_lmt) {
	int comp_res = OJ_AC;
	if (DEBUG)
		execute_cmd("cat %s/error.out", work_dir);
	comp_res = execute_cmd("/bin/grep 'Exception'  %s/error.out", work_dir);
	if (!comp_res) {
		printf("Exception reported\n");
		ACflg = OJ_RE;
	}

	comp_res = execute_cmd(
			"/bin/grep 'java.lang.OutOfMemoryError'  %s/error.out", work_dir);

	if (!comp_res) {
		printf("JVM need more Memory!");
		ACflg = OJ_ML;
		topmemory = mem_lmt * STD_MB;
	}
	comp_res = execute_cmd(
			"/bin/grep 'java.lang.OutOfMemoryError'  %s/user.out", work_dir);

	if (!comp_res) {
		printf("JVM need more Memory or Threads!");
		ACflg = OJ_ML;
		topmemory = mem_lmt * STD_MB;
	}
	comp_res = execute_cmd("/bin/grep 'Could not create'  %s/error.out",
			work_dir);
	if (!comp_res) {
		printf("jvm need more resource,tweak -Xmx(OJ_JAVA_BONUS) Settings");
		ACflg = OJ_RE;
		//topmemory=0;
	}
	return comp_res;
}
int special_judge(char* oj_home, int problem_id, char *infile, char *outfile,
		char *userfile) {

	pid_t pid;
	printf("pid=%d\n", problem_id);
	pid = fork();
	int ret = 0;
	if (pid == 0) {

		while (setgid(1536) != 0)
			sleep(1);
		while (setuid(1536) != 0)
			sleep(1);
		while (setresuid(1536, 1536, 1536) != 0)
			sleep(1);

		struct rlimit LIM; // time limit, file limit& memory limit

		LIM.rlim_cur = 5;
		LIM.rlim_max = LIM.rlim_cur;
		setrlimit(RLIMIT_CPU, &LIM);
		alarm(0);
		alarm(10);

		// file limit
		LIM.rlim_max = STD_F_LIM + STD_MB;
		LIM.rlim_cur = STD_F_LIM;
		setrlimit(RLIMIT_FSIZE, &LIM);

		ret = execute_cmd("%s/data/%d/spj %s %s %s", oj_home, problem_id,
				infile, outfile, userfile);
		if (DEBUG)
			printf("spj1=%d\n", ret);
		if (ret)
			exit(1);
		else
			exit(0);
	} else {
		int status;

		waitpid(pid, &status, 0);
		ret = WEXITSTATUS(status);
		if (DEBUG)
			printf("spj2=%d\n", ret);
	}
	return ret;

}
void judge_solution(int & ACflg, int & usedtime, int time_lmt, int isspj,
		int p_id, char * infile, char * outfile, char * userfile, int & PEflg,
		int lang, char * work_dir, int & topmemory, int mem_lmt,
		int solution_id, double num_of_test) {
	//usedtime-=1000;
	int comp_res;
	if (!oi_mode)
		num_of_test = 1.0;
	if (ACflg == OJ_AC
			&& usedtime > time_lmt * 1000 * (use_max_time ? 1 : num_of_test))
		ACflg = OJ_TL;
	if (topmemory > mem_lmt * STD_MB)
		ACflg = OJ_ML; //issues79
	// compare
	if (ACflg == OJ_AC) {
		if (isspj) {
			comp_res = special_judge(oj_home, p_id, infile, outfile, userfile);

			if (comp_res == 0)
				comp_res = OJ_AC;
			else {
				if (DEBUG)
					printf("fail test %s\n", infile);
				comp_res = OJ_WA;
			}
		} else {
			comp_res = compare(outfile, userfile);
		}
		if (comp_res == OJ_WA) {
			ACflg = OJ_WA;
			if (DEBUG)
				printf("fail test %s\n", infile);
		} else if (comp_res == OJ_PE)
			PEflg = OJ_PE;
		ACflg = comp_res;
	}
	//jvm popup messages, if don't consider them will get miss-WrongAnswer
	if (lang == 3) {
		comp_res = fix_java_mis_judge(work_dir, ACflg, topmemory, mem_lmt);
	}
}

int get_page_fault_mem(struct rusage & ruse, pid_t & pidApp) {
	//java use pagefault
	int m_vmpeak, m_vmdata, m_minflt;
	m_minflt = ruse.ru_minflt * getpagesize();
	if (0 && DEBUG) {
		m_vmpeak = get_proc_status(pidApp, "VmPeak:");
		m_vmdata = get_proc_status(pidApp, "VmData:");
		printf("VmPeak:%d KB VmData:%d KB minflt:%d KB\n", m_vmpeak, m_vmdata,
				m_minflt >> 10);
	}
	return m_minflt;
}
void print_runtimeerror(char * err) {
	FILE *ferr = fopen("error.out", "a+");
	fprintf(ferr, "Runtime Error:%s\n", err);
	fclose(ferr);
}
void clean_session(pid_t p) {
	//char cmd[BUFFER_SIZE];
	const char *pre = "ps awx -o \"\%p \%P\"|grep -w ";
	const char *post = " | awk \'{ print $1  }\'|xargs kill -9";
	execute_cmd("%s %d %s", pre, p, post);
	execute_cmd("ps aux |grep \\^judge|awk '{print $2}'|xargs kill");
}


/*
功能：
	1、ACflg初始為OJ_AC，在這裡各種跟蹤除錯，時刻判斷各種可能的不合理情況
	修改標誌位，結束執行子程序 ---這段好底層。。。。偵錯程式原理？？？高階 
輸入：
    pidApp: 執行子程序的pid
	infile: char * infile[] 在main()中定義，儲存完整測試資料路徑：/home/judge/data/1000/sample.in 或 /home/judge/data/1000/test.in
	ACflg : 程式執行結果標誌，初始OJ_AC
	isspj : 不知什麼意思？？？？？？？？？？？
	solution_id: 代評測題目id
	lang : 程式語言型別 c 0 c++ 1
	topmemory: 在main()中定義
	mem_lmt : 記憶體限制
	usedtime : 執行所耗時間
	time_lmt : 時間限制
	p_id : 問題id
	PEFlg : 未知 初始為OJ_AC
	work_dir : /home/judge/run0
輸出：
    無 
呼叫：
    在main()中呼叫 
    watch_solution(pidApp, infile, ACflg, isspj, userfile, outfile,
					solution_id, lang, topmemory, mem_lmt, usedtime, time_lmt,
					p_id, PEflg, work_dir);
註釋：2014-11-04 18:30 by ghf in HNSSYZX ZhengZhou 

*/
void watch_solution(pid_t pidApp, char * infile, int & ACflg, int isspj,
		char * userfile, char * outfile, int solution_id, int lang,
		int & topmemory, int mem_lmt, int & usedtime, int time_lmt, int & p_id,
		int & PEflg, char * work_dir) {
	// parent
	int tempmemory;

	if (DEBUG)
		printf("pid=%d judging %s\n", pidApp, infile);

	int status, sig, exitcode;
	//與ptrace 相互配合，來進行跟蹤除錯執行子程序 
	struct user_regs_struct reg; 
	struct rusage ruse;
	while (1) {
		// check the usage
		//跟蹤除錯 
		wait4(pidApp, &status, 0, &ruse);

//jvm gc ask VM before need,so used kernel page fault times and page size
		if (lang == 3) {
			tempmemory = get_page_fault_mem(ruse, pidApp);
		} else {        //other use VmPeak
			tempmemory = get_proc_status(pidApp, "VmPeak:") << 10;
		}
		if (tempmemory > topmemory)
			topmemory = tempmemory;
		//記憶體超了就退出，並修改ACflg 
		if (topmemory > mem_lmt * STD_MB) {
			if (DEBUG)
				printf("out of memory %d\n", topmemory);
			if (ACflg == OJ_AC)
				ACflg = OJ_ML;
			ptrace(PTRACE_KILL, pidApp, NULL, NULL);//殺死子程序，停止執行 
			break;
		}
		//sig = status >> 8;/*status >> 8 脙樓脗路脗廬脙隴脗賂脗聧脙樓脗隴脜隆脙婁脣聹脗爐EXITCODE*/

		if (WIFEXITED(status))
			break;
		if ((lang < 4 || lang == 9) && get_file_size("error.out") && !oi_mode) {
			ACflg = OJ_RE;
			//addreinfo(solution_id);
			ptrace(PTRACE_KILL, pidApp, NULL, NULL);
			break;
		}

		if (!isspj
				&& get_file_size(userfile)
						> get_file_size(outfile) * 2 + 1024) {
			ACflg = OJ_OL;
			ptrace(PTRACE_KILL, pidApp, NULL, NULL);
			break;
		}

		exitcode = WEXITSTATUS(status);
		/*exitcode == 5 waiting for next CPU allocation          * ruby using system to run,exit 17 ok
		 *  */
		if ((lang >= 3 && exitcode == 17) || exitcode == 0x05 || exitcode == 0)
			//go on and on
			;
		else {

			if (DEBUG) {
				printf("status>>8=%d\n", exitcode);

			}
			//psignal(exitcode, NULL);

			if (ACflg == OJ_AC) {
				switch (exitcode) {
				case SIGCHLD:
				case SIGALRM:
					alarm(0);
				case SIGKILL:
				case SIGXCPU:
					ACflg = OJ_TL;
					break;
				case SIGXFSZ:
					ACflg = OJ_OL;
					break;
				default:
					ACflg = OJ_RE;
				}
				print_runtimeerror(strsignal(exitcode));
			}
			ptrace(PTRACE_KILL, pidApp, NULL, NULL);

			break;
		}
		if (WIFSIGNALED(status)) {
			/*  WIFSIGNALED: if the process is terminated by signal
			 *
			 *  psignal(int sig, char *s)錛宭ike perror(char *s)錛宲rint out s, with error msg from system of sig  
			 * sig = 5 means Trace/breakpoint trap
			 * sig = 11 means Segmentation fault
			 * sig = 25 means File size limit exceeded
			 */
			sig = WTERMSIG(status);

			if (DEBUG) {
				printf("WTERMSIG=%d\n", sig);
				psignal(sig, NULL);
			}
			if (ACflg == OJ_AC) {
				switch (sig) {
				case SIGCHLD:
				case SIGALRM:
					alarm(0);
				case SIGKILL:
				case SIGXCPU:
					ACflg = OJ_TL;
					break;
				case SIGXFSZ:
					ACflg = OJ_OL;
					break;

				default:
					ACflg = OJ_RE;
				}
				print_runtimeerror(strsignal(sig));
			}
			break;
		}
		/*     comment from http://www.felix021.com/blog/read.php?1662

		 WIFSTOPPED: return true if the process is paused or stopped while ptrace is watching on it
		 WSTOPSIG: get the signal if it was stopped by signal
		 */

		// check the system calls
		ptrace(PTRACE_GETREGS, pidApp, NULL, &reg);
		if (call_counter[reg.REG_SYSCALL] ){
			//call_counter[reg.REG_SYSCALL]--;
		}else if (record_call) {
			call_counter[reg.REG_SYSCALL] = 1;
		
		}else { //do not limit JVM syscall for using different JVM
			ACflg = OJ_RE;
			char error[BUFFER_SIZE];
			sprintf(error,
					"[ERROR] A Not allowed system call: runid:%d callid:%ld\n TO FIX THIS , ask admin to add the CALLID into corresponding LANG_XXV[] located at okcalls32/64.h ,and recompile judge_client",
					solution_id, (long)reg.REG_SYSCALL);
			write_log(error);
			print_runtimeerror(error);
			ptrace(PTRACE_KILL, pidApp, NULL, NULL);
		}
		

		ptrace(PTRACE_SYSCALL, pidApp, NULL, NULL);
	}
	usedtime += (ruse.ru_utime.tv_sec * 1000 + ruse.ru_utime.tv_usec / 1000);
	usedtime += (ruse.ru_stime.tv_sec * 1000 + ruse.ru_stime.tv_usec / 1000);

	//clean_session(pidApp);
}

//清空目錄 
void clean_workdir(char * work_dir) {
	//解除安裝 /home/judge/run0 下的檔案系統 /proc 
	execute_cmd("/bin/umount %s/proc", work_dir);
	if (DEBUG) {//如果除錯則刪除日誌檔案 
		execute_cmd("/bin/mv %s/* %slog/", work_dir, work_dir);
	} else {//沒除錯則刪除/home/judge/run0 下所有檔案 -rf 遞迴強制刪除所有目錄與檔案，不提示 
		execute_cmd("/bin/rm -Rf %s/*", work_dir);

	}

}


//在judge.cc中呼叫引數 
//runidstr  : solution_id 的字串 引數1
//buf		: clientid   也就是程序id字串
//oj_home	: /home/judge 
//execl("/usr/bin/judge_client", "/usr/bin/judge_client", runidstr, buf,
//				oj_home, (char *) NULL);
//argv[0] 指向程式執行的全路徑名
//argv[1] 指向在DOS命令列中執行程式名後的第一個字串
//argv[2] 指向執行程式名後的第二個字串
void init_parameters(int argc, char ** argv, int & solution_id,
		int & runner_id) {
	if (argc < 3) {//如果引數小於3個，則報錯退出 
		fprintf(stderr, "Usage:%s solution_id runner_id.\n", argv[0]);
		fprintf(stderr, "Multi:%s solution_id runner_id judge_base_path.\n",
				argv[0]);
		fprintf(stderr,
				"Debug:%s solution_id runner_id judge_base_path debug.\n",
				argv[0]);
		exit(1);
	}
	//引數大於4個則啟用除錯？？？？ ，預設4個所以0 
	DEBUG = (argc > 4);
	record_call = (argc > 5);//這個不懂？？？ 
	if (argc > 5) {//第6個引數，評測語言 
		strcpy(LANG_NAME, argv[5]);
	}
	if (argc > 3) //第4個引數，評測目錄 
		strcpy(oj_home, argv[3]);
	else//否則預設目錄設定為/home/judge 
		strcpy(oj_home, "/home/judge");
	//切換當前預設目錄為/home/judge 
	chdir(oj_home); // change the dir// init our work

	solution_id = atoi(argv[1]);
	runner_id = atoi(argv[2]);
}
int get_sim(int solution_id, int lang, int pid, int &sim_s_id) {
	char src_pth[BUFFER_SIZE];
	//char cmd[BUFFER_SIZE];
	sprintf(src_pth, "Main.%s", lang_ext[lang]);

	int sim = execute_cmd("/usr/bin/sim.sh %s %d", src_pth, pid);
	if (!sim) {
		execute_cmd("/bin/mkdir ../data/%d/ac/", pid);

		execute_cmd("/bin/cp %s ../data/%d/ac/%d.%s", src_pth, pid, solution_id,
				lang_ext[lang]);
		//c cpp will
		if (lang == 0)
			execute_cmd("/bin/ln ../data/%d/ac/%d.%s ../data/%d/ac/%d.%s", pid,
					solution_id, lang_ext[lang], pid, solution_