MySQL: Connect From an Other System / Computer

Posted on July 25, 2012June 25, 2015 by coder

Sample Setup

1	Sample Setup

+----------- server1 192.168.1.6
|
+------------ tomcat1 192.168.1.7
|
+------------------+ |
| MySQL Server | --------+------------ apache2 192.168.1.8
| 192.168.1.5:3306 | --------+
+------------------+ |
LAN 192.168.1.0/24 +------------- pc1 192.168.1.51
|
|
+-------------- pc25 192.168.1.76

+----------- server1 192.168.1.6

+------------ tomcat1 192.168.1.7

+------------------+ |

| MySQL Server | --------+------------ apache2 192.168.1.8

| 192.168.1.5:3306 | --------+

+------------------+ |

LAN 192.168.1.0/24 +------------- pc1 192.168.1.51

+-------------- pc25 192.168.1.76

You need to allow access to 192.168.1.5 from apache server located at 192.168.1.8.

Step #1: Configure MySQL Server For Remote Access

$ ssh root@192.168.1.5
[/bash]
Edit /etc/my.cnf, enter:

# vi /etc/my.cnf

$ ssh root@192.168.1.5

[/bash]

Edit /etc/my.cnf, enter:

# vi /etc/my.cnf

Modify or append as follows:

# make sure the following line is deleted or commented out
# skip-networking
bind-address = 192.168.1.5

# ------------------
# Save and close the file. Restart the mysql server, enter:

# service mysqld restart

Verify that the TCP port 3306 is open, enter:

Make Sure TCP Port # 3306 is Opened For Business

# netstat -tulpn | grep :3306

# make sure the following line is deleted or commented out

# skip-networking

bind-address = 192.168.1.5

# ------------------

# Save and close the file. Restart the mysql server, enter:

# service mysqld restart

Verify that the TCP port 3306 is open, enter:

Make Sure TCP Port # 3306 is Opened For Business

# netstat -tulpn | grep :3306

Step #2: Linux Firewall Configuration For TCP Port # 3306
# >>>> You need to open TCP port # 3306 at the firewall level, enter:

# iptables -A INPUT -i eth0 -s 192.168.1.8 -p tcp --destination-port 3306 -j ACCEPT
# service iptables save
Step #3: Configure Database Remote Access
# mysql -u root -p mysql

mysql> update db set Host='192.168.1.8' where Db='salesdb';
mysql> update user set Host='192.1681.8' where user='foo';
mysql> \q

# Login to 192.168.1.8 and type the following command to test mysql server remote access:
$ mysql -u foo -h 192.168.1.5 -p salesdb

# iptables -A INPUT -i eth0 -s 192.168.1.8 -p tcp --destination-port 3306 -j ACCEPT

# service iptables save

Step #3: Configure Database Remote Access

# mysql -u root -p mysql

mysql> update db set Host='192.168.1.8' where Db='salesdb';

mysql> update user set Host='192.1681.8' where user='foo';

mysql> \q

# Login to 192.168.1.8 and type the following command to test mysql server remote access:

$ mysql -u foo -h 192.168.1.5 -p salesdb

Sample outputs:

Reading table information for completion of table and column names
You can turn off this feature to get a quicker startup with -A
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 27720995
Server version: 5.0.77 Source distribution
Type 'help;' or '\h' for help. Type '\c' to clear the buffer.
mysql>

Reading table information for completion of table and column names

You can turn off this feature to get a quicker startup with -A

Welcome to the MySQL monitor. Commands end with ; or \g.

Your MySQL connection id is 27720995

Server version: 5.0.77 Source distribution

Type 'help;' or '\h' for help. Type '\c' to clear the buffer.

mysql>

Windows 7 Açılırken Kullanıcı Adı ve Şifre Sormasın

Posted on July 25, 2012June 25, 2015 by coder

başlat/ çalıştır ,

CONTROL USERPASSWORDS2

yazıp enter layın.
Gelen pencerede “Kullanıcı bu bilgisayarı kullanmak için kullanıcı ve parola girmelidir” yazan yerin yanındaki işareti kaldırın.

How Do I Enable Remote Access To MySQL Database Server?

Posted on July 23, 2012June 25, 2015 by coder

How Do I Enable Remote Access To MySQL Database Server?

You need type the following commands which will allow remote connections.
Step # 1: Login Using SSH (if server is outside your data center)

First, login over ssh to remote MySQL database server:

ssh user@server1.cyberciti.biz
Step # 2: Edit my.cnf File

1 2	ssh user@server1.cyberciti.biz Step # 2: Edit my.cnf File

Once connected you need to edit the MySQL server configuration file my.cnf using a text editor such as vi.

If you are using Debian Linux file is located at /etc/mysql/my.cnf location
If you are using Red Hat Linux/Fedora/Centos Linux file is located at /etc/my.cnf location
If you are using FreeBSD you need to create a file /var/db/mysql/my.cnf

If you are using Debian Linux file is located at /etc/mysql/my.cnf location

If you are using Red Hat Linux/Fedora/Centos Linux file is located at /etc/my.cnf location

If you are using FreeBSD you need to create a file /var/db/mysql/my.cnf

Edit /etc/my.cnf, run:
# vi /etc/my.cnf

1 2	Edit /etc/my.cnf, run: # vi /etc/my.cnf

Step # 3: Once file opened, locate line that read as follows

[mysqld]
Make sure line skip-networking is commented (or remove line) and add following line

bind-address=YOUR-SERVER-IP
For example, if your MySQL server IP is 65.55.55.2 then entire block should be look like as follows:

[mysqld]

Make sure line skip-networking is commented (or remove line) and add following line

bind-address=YOUR-SERVER-IP

For example, if your MySQL server IP is 65.55.55.2 then entire block should be look like as follows:

[mysqld]
user = mysql
pid-file = /var/run/mysqld/mysqld.pid
socket = /var/run/mysqld/mysqld.sock
port = 3306
basedir = /usr
datadir = /var/lib/mysql
tmpdir = /tmp
language = /usr/share/mysql/English
bind-address = 65.55.55.2
# skip-networking

[mysqld]

user = mysql

pid-file = /var/run/mysqld/mysqld.pid

socket = /var/run/mysqld/mysqld.sock

port = 3306

basedir = /usr

datadir = /var/lib/mysql

tmpdir = /tmp

language = /usr/share/mysql/English

bind-address = 65.55.55.2

# skip-networking

Where,

bind-address : IP address to bind to.
skip-networking : Don’t listen for TCP/IP connections at all. All interaction with mysqld must be made via Unix sockets. This option is highly recommended for systems where only local requests are allowed. Since you need to allow remote connection this line should be removed from my.cnf or put it in comment state.
Step# 4 Save and Close the file

If you are using Debian / Ubuntu Linux, type the following command to restart the mysql server:
# /etc/init.d/mysql restart

If you are using RHEL / CentOS / Fedora / Scientific Linux, type the following command to restart the mysql server:
# /etc/init.d/mysqld restart

If you are using FreeBSD, type the following command to restart the mysql server:
# /usr/local/etc/rc.d/mysql-server stop
# /usr/local/etc/rc.d/mysql-server start

OR
# /usr/local/etc/rc.d/mysql-server restart

If you are using Debian / Ubuntu Linux, type the following command to restart the mysql server:

# /etc/init.d/mysql restart

If you are using RHEL / CentOS / Fedora / Scientific Linux, type the following command to restart the mysql server:

# /etc/init.d/mysqld restart

If you are using FreeBSD, type the following command to restart the mysql server:

# /usr/local/etc/rc.d/mysql-server stop

# /usr/local/etc/rc.d/mysql-server start

# /usr/local/etc/rc.d/mysql-server restart

Step # 5 Grant access to remote IP address

Connect to mysql server:
$ mysql -u root -p mysql

Grant access to a new database
If you want to add a new database called foo for user bar and remote IP 202.54.10.20 then you need to type the following commands at mysql> prompt:

mysql> CREATE DATABASE foo;
mysql> GRANT ALL ON foo.* TO bar@'202.54.10.20' IDENTIFIED BY 'PASSWORD';


How Do I Grant Access To An Existing Database?

Let us assume that you are always making connection from remote IP called 202.54.10.20 for database called webdb for user webadmin, To grant access to this IP address type the following command At mysql> prompt for existing database, enter:

mysql> update db set Host='202.54.10.20' where Db='webdb';
mysql> update user set Host='202.54.10.20' where user='webadmin';

Connect to mysql server:

$ mysql -u root -p mysql

Grant access to a new database

If you want to add a new database called foo for user bar and remote IP 202.54.10.20 then you need to type the following commands at mysql> prompt:

mysql> CREATE DATABASE foo;

mysql> GRANT ALL ON foo.* TO bar@'202.54.10.20' IDENTIFIED BY 'PASSWORD';

How Do I Grant Access To An Existing Database?

Let us assume that you are always making connection from remote IP called 202.54.10.20 for database called webdb for user webadmin, To grant access to this IP address type the following command At mysql> prompt for existing database, enter:

mysql> update db set Host='202.54.10.20' where Db='webdb';

mysql> update user set Host='202.54.10.20' where user='webadmin';

Step # 6: Logout of MySQL

Type exit command to logout mysql:
mysql> exit

Step # 7: Open port 3306

You need to open TCP port 3306 using iptables or BSD pf firewall.

A sample iptables rule to open Linux iptables firewall
/sbin/iptables -A INPUT -i eth0 -p tcp --destination-port 3306 -j ACCEPT
OR only allow remote connection from your web server located at 10.5.1.3:

/sbin/iptables -A INPUT -i eth0 -s 10.5.1.3 -p tcp --destination-port 3306 -j ACCEPT
OR only allow remote connection from your lan subnet 192.168.1.0/24:

/sbin/iptables -A INPUT -i eth0 -s 192.168.1.0/24 -p tcp --destination-port 3306 -j ACCEPT
Finally save all rules (RHEL / CentOS specific command):
# service iptables save


A sample FreeBSD / OpenBSD pf rule ( /etc/pf.conf)
pass in on $ext_if proto tcp from any to any port 3306
OR allow only access from your web server located at 10.5.1.3:

pass in on $ext_if proto tcp from 10.5.1.3 to any port 3306 flags S/SA synproxy state

You need to open TCP port 3306 using iptables or BSD pf firewall.

A sample iptables rule to open Linux iptables firewall

/sbin/iptables -A INPUT -i eth0 -p tcp --destination-port 3306 -j ACCEPT

OR only allow remote connection from your web server located at 10.5.1.3:

/sbin/iptables -A INPUT -i eth0 -s 10.5.1.3 -p tcp --destination-port 3306 -j ACCEPT

OR only allow remote connection from your lan subnet 192.168.1.0/24:

/sbin/iptables -A INPUT -i eth0 -s 192.168.1.0/24 -p tcp --destination-port 3306 -j ACCEPT

Finally save all rules (RHEL / CentOS specific command):

# service iptables save

A sample FreeBSD / OpenBSD pf rule ( /etc/pf.conf)

pass in on $ext_if proto tcp from any to any port 3306

OR allow only access from your web server located at 10.5.1.3:

pass in on $ext_if proto tcp from 10.5.1.3 to any port 3306 flags S/SA synproxy state

Step # 8: Test it

From your remote system or your desktop type the following command:
$ mysql -u webadmin –h 65.55.55.2 –p
Where,

-u webadmin: webadmin is MySQL username
-h IP or hostname: 65.55.55.2 is MySQL server IP address or hostname (FQDN)
-p : Prompt for password
You can also use the telnet or nc command to connect to port 3306 for testing purpose:
$ echo X | telnet -e X 65.55.55.2 3306


OR
$ nc -z -w1 65.55.55.2 3306

Sample outputs:
Connection to 65.55.55.2 3306 port [tcp/mysql]
succeeded!

From your remote system or your desktop type the following command:

$ mysql -u webadmin –h 65.55.55.2 –p

Where,

-u webadmin: webadmin is MySQL username

-h IP or hostname: 65.55.55.2 is MySQL server IP address or hostname (FQDN)

-p : Prompt for password

You can also use the telnet or nc command to connect to port 3306 for testing purpose:

$ echo X | telnet -e X 65.55.55.2 3306

$ nc -z -w1 65.55.55.2 3306

Sample outputs:

Connection to 65.55.55.2 3306 port [tcp/mysql]

succeeded!

semafors

Posted on July 18, 2012June 25, 2015 by coder

[<<Previous Entry] [^^Up^^] [Next Entry>>] [Menu] [About The Guide]

Производитель и Потребитель буфера

ПРОИЗВОДИТЕЛЬ БУФЕРА, prod_onebuf.c :

 /* producer program:
 producer program sets up a buffer to be read by a consumer
 semaphores are used to ensure that producer doesn't
 overwrite an unread buffer and consumer doesn't
 the same data more than once.
 */
 #include <sys/types.h>
 #include <unistd.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <sys/ipc.h>
 #include <sys/sem.h>
 #include <sys/shm.h>
 #define MSG_SIZE 30
 #define MAX 5

 main()
 {
 key_t key;
 /* two semaphores in a set
 index 0 -incremented when producer has reset buffer
 -tested and decremented by consumer to check
 if buffer has been reset
 index 1 -incremented when consumer has read buffer
 -tested and decremented by producer to check
 if consumer is done
 */
 static struct sembuf wait_consumed = { 1, -1, 0};
 static struct sembuf signal_produced = { 0, 1, 0};
 int semid, shmid, i;
 char *message;

 if((key = ftok( getenv("HOME"), 'u')) == -1){
 fprintf(stderr,"ftok key formation error\n");

 exit(1);
 }

 if((semid=semget(key, 2, IPC_CREAT | 0660)) == -1){
 perror("producer semget():");
 exit(2);
 }

 if((shmid=shmget(key, MSG_SIZE, IPC_CREAT | 0660)) == -1) {
 perror("producer shmget():");
 exit(3);
 }

 message=shmat(shmid, 0, 0);

 for(i=1; i < MAX; i++) {
 /* producer has to go first */
if(i > 1)
 semop(semid,&wait_consumed,1);
 sprintf(message, "message %d", i);
 semop(semid, &signal_produced, 1);
 }
 shmdt(message);
 sleep(5); /* allow consumer to digest last message */

 /* alternatively a DELIMITER string could be placed in
 shared memory when seen by the consumer, it would exit.
 the producer would do shmctl(...,IPC_STAT,...)
 and when shm_attach==1
 it would remove the two IPC facilities
 */
 shmctl(shmid, IPC_RMID, NULL);
 semctl(semid, 0, IPC_RMID ,0);
 }
NОТРЕБИТЕЛЬ БУФЕРА, cons_onebuf.c :

 /* consumer program:
producer program sets up a buffer to be read by a consumer.
semaphores are used to ensure that producer doesn't
 overwrite an unread buffer and consumer doesn't
 read the same data more than once.
 */
 #include <sys/types.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <sys/ipc.h>
 #include <sys/sem.h>
 #include <sys/shm.h>
 #define MSG_SIZE 30

 main(int argc, char *argv[])
 {
 key_t key;
 /* two semaphores in a set
 index 0 - incremented when producer has reset buffer
 - tested and decremented by consumer to check
 if buffer has been reset
 index 1 - incremented when consumer has read buffer
 - tested and decremented by producer to check
 if consumer is done
 */
 static struct sembuf wait_produced = { 0, -1, 0};
 static struct sembuf signal_consumed = { 1, 1, 0};
 int semid, shmid, rtn;
 char *message;

 if((key = ftok( getenv("HOME"), 'u')) == -1){
 fprintf(stderr,"ftok key formation error\n");
 exit(1);
 }

 /* either producer or consumer might be the creator
 but producer will be the remover of the IPC resources.
 producer and consumer's effective uid must be the same.
 */
 if ((semid=semget(key, 2, IPC_CREAT | 0660)) == -1) {
 perror("consumer semget():");
 exit(2);
}

 if ((shmid=shmget(key, MSG_SIZE, IPC_CREAT | 0660)) == -1) {
 perror("producer shmget():");
 exit(3);
 }

 message=shmat(shmid, (char *)0, SHM_RDONLY);

 while(1){
 rtn=semop(semid,&wait_produced,1);
 /* when producer is done semid will be IPC_RMID forcing break */
 if(rtn == -1){
 perror("consumer - semop on wait_consumed");
 break;
 }
 printf("%s received: %s\n", argv[0], message);
 semop(semid, &signal_consumed, 1);
 }
 shmdt(message);
 exit(0);
 }

ВЫЗОВ:
$ prod_onebuf&
14649
$ cons_onebuf
cons_onebuf received: message 1
cons_onebuf received: message 2
cons_onebuf received: message 3
cons_onebuf received: message 4
consumer-semop on wait_consumed:Identifier removed

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[<<Previous Entry] [^^Up^^] [Next Entry>>] [Menu] [About The Guide]

Производитель и Потребитель буфера

ПРОИЗВОДИТЕЛЬ БУФЕРА, prod_onebuf.c :

/* producer program:

producer program sets up a buffer to be read by a consumer

semaphores are used to ensure that producer doesn't

overwrite an unread buffer and consumer doesn't

the same data more than once.

#include <sys/types.h>

#include <unistd.h>

#include <stdio.h>

#include <stdlib.h>

#include <sys/ipc.h>

#include <sys/sem.h>

#include <sys/shm.h>

#define MSG_SIZE 30

#define MAX 5

main()

{

key_t key;

/* two semaphores in a set

index 0 -incremented when producer has reset buffer

-tested and decremented by consumer to check

if buffer has been reset

index 1 -incremented when consumer has read buffer

-tested and decremented by producer to check

if consumer is done

static struct sembuf wait_consumed = { 1, -1, 0};

static struct sembuf signal_produced = { 0, 1, 0};

int semid, shmid, i;

char *message;

if((key = ftok( getenv("HOME"), 'u')) == -1){

fprintf(stderr,"ftok key formation error\n");

exit(1);

}

if((semid=semget(key, 2, IPC_CREAT | 0660)) == -1){

perror("producer semget():");

exit(2);

}

if((shmid=shmget(key, MSG_SIZE, IPC_CREAT | 0660)) == -1) {

perror("producer shmget():");

exit(3);

}

message=shmat(shmid, 0, 0);

for(i=1; i < MAX; i++) {

/* producer has to go first */

if(i > 1)

semop(semid,&wait_consumed,1);

sprintf(message, "message %d", i);

semop(semid, &signal_produced, 1);

}

shmdt(message);

sleep(5); /* allow consumer to digest last message */

/* alternatively a DELIMITER string could be placed in

shared memory when seen by the consumer, it would exit.

the producer would do shmctl(...,IPC_STAT,...)

and when shm_attach==1

it would remove the two IPC facilities

shmctl(shmid, IPC_RMID, NULL);

semctl(semid, 0, IPC_RMID ,0);

}

NОТРЕБИТЕЛЬ БУФЕРА, cons_onebuf.c :

/* consumer program:

producer program sets up a buffer to be read by a consumer.

semaphores are used to ensure that producer doesn't

overwrite an unread buffer and consumer doesn't

read the same data more than once.

#include <sys/types.h>

#include <stdio.h>

#include <stdlib.h>

#include <sys/ipc.h>

#include <sys/sem.h>

#include <sys/shm.h>

#define MSG_SIZE 30

main(int argc, char *argv[])

{

key_t key;

/* two semaphores in a set

index 0 - incremented when producer has reset buffer

- tested and decremented by consumer to check

if buffer has been reset

index 1 - incremented when consumer has read buffer

- tested and decremented by producer to check

if consumer is done

static struct sembuf wait_produced = { 0, -1, 0};

static struct sembuf signal_consumed = { 1, 1, 0};

int semid, shmid, rtn;

char *message;

if((key = ftok( getenv("HOME"), 'u')) == -1){

fprintf(stderr,"ftok key formation error\n");

exit(1);

}

/* either producer or consumer might be the creator

but producer will be the remover of the IPC resources.

producer and consumer's effective uid must be the same.

if ((semid=semget(key, 2, IPC_CREAT | 0660)) == -1) {

perror("consumer semget():");

exit(2);

}

if ((shmid=shmget(key, MSG_SIZE, IPC_CREAT | 0660)) == -1) {

perror("producer shmget():");

exit(3);

}

message=shmat(shmid, (char *)0, SHM_RDONLY);

while(1){

rtn=semop(semid,&wait_produced,1);

/* when producer is done semid will be IPC_RMID forcing break */

if(rtn == -1){

perror("consumer - semop on wait_consumed");

break;

}

printf("%s received: %s\n", argv[0], message);

semop(semid, &signal_consumed, 1);

}

shmdt(message);

exit(0);

}

ВЫЗОВ:

$ prod_onebuf&

14649

$ cons_onebuf

cons_onebuf received: message 1

cons_onebuf received: message 2

cons_onebuf received: message 3

cons_onebuf received: message 4

consumer-semop on wait_consumed:Identifier removed

matrix fork using c++

Posted on July 17, 2012June 25, 2015 by coder

[c]
#include <stdio.h>
#include <iostream>
#include <cstdio>
#include <unistd.h>
#include <sys/types.h>
#include <sys/ipc.h>
#include <sys/shm.h>
#include <sys/wait.h>
#include <string>
#include <vector>
#include <cstring>
#include <cstdlib>
#include<fstream>
#include <time.h>
// Kutay ZORLU

using namespace std;
void readfile();

vector<string> satirlar(9);
vector<string> sonuc(9);
vector <int> A(16);
vector<int > B(16);
vector<int > C(16);
int main (){

string str = "SOMEload";
double start = clock();

bool okudumu=false;
int fork_id = fork();
while (!okudumu)
{
switch (fork_id) { // forkun durumuna gore asagidaki kodlar gerceklestirilecek

case -1: // -1 hata durumu idi
perror("fork");
return 3;

default:

if(!okudumu){
readfile();
okudumu = true;
}
else{
cout << "babadayım "<<endl;
//wait(0); // let the child finish
C[0] = A[0]*B[0]+ A[1]*B[4] + A[2]*B[8] + A[3]*B[12];
C[1] = A[0]*B[1]+ A[1]*B[5] + A[2]*B[9] + A[3]*B[13];
C[2] = A[0]*B[2]+ A[1]*B[6] + A[2]*B[10] + A[3]*B[14];
C[3] = A[0]*B[3]+ A[1]*B[7] + A[2]*B[11] + A[3]*B[15];
C[4] = A[4]*B[0]+ A[5]*B[4] + A[6]*B[8] + A[7]*B[12];
C[5] = A[4]*B[1]+ A[5]*B[5] + A[6]*B[9] + A[7]*B[13];
C[6] = A[4]*B[2]+ A[5]*B[6] + A[6]*B[10] + A[7]*B[14];
C[7] = A[4]*B[3]+ A[5]*B[7] + A[6]*B[11] + A[7]*B[15];
cout << "DEFAULT 1 içindeuim"<< endl;
}

break;
// break olana kadar default calisiyor

case 0:

//bebe
cout << "CASE 0 içindeyim"<< endl;

if(okudumu){
cout << "C carpti" ;
C[8] = A[8]*B[0]+ A[9]*B[4] + A[10]*B[8] + A[11]*B[12];
C[9] = A[8]*B[1]+ A[9]*B[5] + A[10]*B[9] + A[11]*B[13];
C[10] = A[8]*B[2]+ A[9]*B[6] + A[10]*B[10] + A[11]*B[14];
C[11] = A[8]*B[3]+ A[9]*B[7] + A[10]*B[11] + A[11]*B[15];
C[12] = A[12]*B[0]+ A[13]*B[4] + A[14]*B[8] + A[15]*B[12];
C[13] = A[12]*B[1]+ A[13]*B[5] + A[14]*B[9] + A[15]*B[13];
C[14] = A[12]*B[2]+ A[13]*B[6] + A[14]*B[10] + A[15]*B[14];
C[15] = A[12]*B[3]+ A[13]*B[7] + A[14]*B[11] + A[15]*B[15];
}

break;
}
}

//
//
//
cout << str << endl;
//
double finish = clock();

int sure_time = (double(finish-start)/CLOCKS_PER_SEC);
cout << "SURE : "<<sure_time << endl;
return 1;
}

void readfile(){

ifstream myfile,myfile_2;

myfile.open ("veri.dat");

//
char output[100];
int i=0;
if (myfile.is_open()) {
while (!myfile.eof()) {
//
myfile.getline(output,100) ;
cout << output << "[" << i << "]" <<endl;
i++;

}
}
myfile.close();

myfile_2.open ("veri.dat");

//

i=0; char xx[100];
if (myfile_2.is_open())
{
while (!myfile_2.eof())
{
if(i<1) { myfile_2 >> xx;}
else
{
myfile_2 >> A[i-1];
cout << "A["<<i-1 << "]:" << A[i-1] <<endl;
if((i-1)>15)
{
B[i-17] = A[i-1]; //b2 4
cout <<"B["<<i-17<< "]" << B[i-17]<< endl;
}

}
i++;
}
}
myfile_2.close();
//myfile << "Writing this to a file.\n";
}

[/c]

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[c]

#include <stdio.h>

#include <iostream>

#include <cstdio>

#include <unistd.h>

#include <sys/types.h>

#include <sys/ipc.h>

#include <sys/shm.h>

#include <sys/wait.h>

#include <string>

#include <vector>

#include <cstring>

#include <cstdlib>

#include<fstream>

#include <time.h>

// Kutay ZORLU

using namespace std;

void readfile();

vector<string> satirlar(9);

vector<string> sonuc(9);

vector <int> A(16);

vector<int > B(16);

vector<int > C(16);

int main (){

string str = "SOMEload";

double start = clock();

bool okudumu=false;

int fork_id = fork();

while (!okudumu)

{

switch (fork_id) { // forkun durumuna gore asagidaki kodlar gerceklestirilecek

case -1: // -1 hata durumu idi

perror("fork");

return 3;

default:

if(!okudumu){

readfile();

okudumu = true;

}

else{

cout << "babadayım "<<endl;

//wait(0); // let the child finish

C[0] = A[0]*B[0]+ A[1]*B[4] + A[2]*B[8] + A[3]*B[12];

C[1] = A[0]*B[1]+ A[1]*B[5] + A[2]*B[9] + A[3]*B[13];

C[2] = A[0]*B[2]+ A[1]*B[6] + A[2]*B[10] + A[3]*B[14];

C[3] = A[0]*B[3]+ A[1]*B[7] + A[2]*B[11] + A[3]*B[15];

C[4] = A[4]*B[0]+ A[5]*B[4] + A[6]*B[8] + A[7]*B[12];

C[5] = A[4]*B[1]+ A[5]*B[5] + A[6]*B[9] + A[7]*B[13];

C[6] = A[4]*B[2]+ A[5]*B[6] + A[6]*B[10] + A[7]*B[14];

C[7] = A[4]*B[3]+ A[5]*B[7] + A[6]*B[11] + A[7]*B[15];

cout << "DEFAULT 1 içindeuim"<< endl;

}

break;

// break olana kadar default calisiyor

case 0:

//bebe

cout << "CASE 0 içindeyim"<< endl;

if(okudumu){

cout << "C carpti" ;

C[8] = A[8]*B[0]+ A[9]*B[4] + A[10]*B[8] + A[11]*B[12];

C[9] = A[8]*B[1]+ A[9]*B[5] + A[10]*B[9] + A[11]*B[13];

C[10] = A[8]*B[2]+ A[9]*B[6] + A[10]*B[10] + A[11]*B[14];

C[11] = A[8]*B[3]+ A[9]*B[7] + A[10]*B[11] + A[11]*B[15];

C[12] = A[12]*B[0]+ A[13]*B[4] + A[14]*B[8] + A[15]*B[12];

C[13] = A[12]*B[1]+ A[13]*B[5] + A[14]*B[9] + A[15]*B[13];

C[14] = A[12]*B[2]+ A[13]*B[6] + A[14]*B[10] + A[15]*B[14];

C[15] = A[12]*B[3]+ A[13]*B[7] + A[14]*B[11] + A[15]*B[15];

}

break;

}

cout << str << endl;

double finish = clock();

int sure_time = (double(finish-start)/CLOCKS_PER_SEC);

cout << "SURE : "<<sure_time << endl;

return 1;

}

void readfile(){

ifstream myfile,myfile_2;

myfile.open ("veri.dat");

char output[100];

int i=0;

if (myfile.is_open()) {

while (!myfile.eof()) {

myfile.getline(output,100) ;

cout << output << "[" << i << "]" <<endl;

i++;

}

myfile.close();

myfile_2.open ("veri.dat");

i=0; char xx[100];

if (myfile_2.is_open())

{

while (!myfile_2.eof())

{

if(i<1) { myfile_2 >> xx;}

else

{

myfile_2 >> A[i-1];

cout << "A["<<i-1 << "]:" << A[i-1] <<endl;

if((i-1)>15)

{

B[i-17] = A[i-1]; //b2 4

cout <<"B["<<i-17<< "]" << B[i-17]<< endl;

}

i++;

}

myfile_2.close();

//myfile << "Writing this to a file.\n";

}

[/c]

qt paint class

Posted on July 16, 2012June 25, 2015 by coder

class xxxx : public QAbstractItemDelegate
{
public:
xxxx( QObject *parent = 0 );

void paint( QPainter *painter, const QStyleOptionViewItem &option, const QModelIndex &index ) const;
QSize sizeHint( const QStyleOptionViewItem &option, const QModelIndex &index ) const;
};

class xxxx : public QAbstractItemDelegate

{

public:

xxxx( QObject *parent = 0 );

void paint( QPainter *painter, const QStyleOptionViewItem &option, const QModelIndex &index ) const;

QSize sizeHint( const QStyleOptionViewItem &option, const QModelIndex &index ) const;

};

Search in directories on ubuntu

Posted on July 14, 2012July 28, 2015 by coder

Locating Files by Name

The most common use of find is in the search for a specific file by use of its name. The following command searches the home directory and all of its subdirectories looking for the file mysong.ogg:

find $HOME -name 'mysong.ogg'

1	find $HOME -name 'mysong.ogg'

It is important to get into the habit of quoting patterns in your search as seen above or your search results can be a little unpredictable. Such a search can be much more sophisticated though. For example if you wished to search for all of the ogg files in your home directory, some of which you think might be named ‘OGG’ rather than ‘ogg’, you would run:

find $HOME -iname '*.ogg'

1	find $HOME -iname '*.ogg'

Here the option ‘-iname’ performs a case-insensitive search while the wildcard character ‘*’ matches any character, or number of characters, or zero characters. To perform the same search on your entire drive you would run:

sudo find / -iname '*.ogg'

1	sudo find / -iname '*.ogg'

This could be a slow search depending on the number of directories, sub-directories and files on your system. This highlights an important difference in the way that find operates in that it examines the system directly each time unlike programs like locate or slocate which actually examine a regularly updated database of filnames and locations.

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