#include <stdio.h>

#include <stdlib.h>

#include <sys/socket.h>

#include <netinet/in.h>

#include <string.h>

#include <arpa/inet.h>

#include <fcntl.h> // for open

#include <unistd.h> // for close

#include <pthread.h>

char client_message[2000];

char buffer[1024];

pthread_mutex_t lock = PTHREAD_MUTEX_INITIALIZER;

void * socketThread(void *arg)

{

  int newSocket = *((int *)arg);

  recv(newSocket , client_message , 2000 , 0);

  // Send message to the client socket 

  pthread_mutex_lock(&lock);

  char *message = malloc(sizeof(client_message)+20);

  strcpy(message,"Hello Client : ");

  strcat(message,client_message);

  strcat(message,"\n");

  strcpy(buffer,message);

  free(message);

  pthread_mutex_unlock(&lock);

  sleep(1);

  send(newSocket,buffer,13,0);

  printf("Exit socketThread \n");

  close(newSocket);

  pthread_exit(NULL);

}

int main(){

  int serverSocket, newSocket;

  struct sockaddr_in serverAddr;

  struct sockaddr_storage serverStorage;

  socklen_t addr_size;

  //Create the socket. 

  serverSocket = socket(PF_INET, SOCK_STREAM, 0);

  // Configure settings of the server address struct

  // Address family = Internet 

  serverAddr.sin_family = AF_INET;

  //Set port number, using htons function to use proper byte order 

  serverAddr.sin_port = htons(7799);

  //Set IP address to localhost 

  serverAddr.sin_addr.s_addr = inet_addr("127.0.0.1");

  //Set all bits of the padding field to 0 

  memset(serverAddr.sin_zero, '\0', sizeof serverAddr.sin_zero);

  //Bind the address struct to the socket 

  bind(serverSocket, (struct sockaddr *) &serverAddr, sizeof(serverAddr));

  //Listen on the socket, with 40 max connection requests queued 

  if(listen(serverSocket,50)==0)

    printf("Listening\n");

  else

    printf("Error\n");

    pthread_t tid[60];

    int i = 0;

    while(1)

    {

        //Accept call creates a new socket for the incoming connection

        addr_size = sizeof serverStorage;

        newSocket = accept(serverSocket, (struct sockaddr *) &serverStorage, &addr_size);

        //for each client request creates a thread and assign the client request to it to process

       //so the main thread can entertain next request

        if( pthread_create(&tid[i++], NULL, socketThread, &newSocket) != 0 )

           printf("Failed to create thread\n");

        if( i >= 50)

        {

          i = 0;

          while(i < 50)

          {

            pthread_join(tid[i++],NULL);

          }

          i = 0;

        }

    }

  return 0;

}

#include <stdio.h>

#include <stdlib.h>

#include <sys/socket.h>

#include <netinet/in.h>

#include <string.h>

#include <arpa/inet.h>

#include <fcntl.h> // for open

#include <unistd.h> // for close

#include <sys/types.h>

#include <pthread.h>

pthread_mutex_t lock = PTHREAD_MUTEX_INITIALIZER;

void  socketThread(int clientSocket)

{

  char client_message[2000];

  char buffer[1024];

  int newSocket = clientSocket;

  recv(newSocket , client_message , 2000 , 0);

  // Send message to the client socket

  pthread_mutex_lock(&lock);

  char *message = malloc(sizeof(client_message)+20);

  strcpy(message,"Hello Client : ");

  strcat(message,client_message);

  strcat(message,"\n");

  strcpy(buffer,message);

  free(message);

  pthread_mutex_unlock(&lock);

  sleep(1);

  send(newSocket,buffer,13,0);

  printf("Exit socketThread \n");

  close(newSocket);

  }

int main(){

  int serverSocket, newSocket;

  struct sockaddr_in serverAddr;

  struct sockaddr_storage serverStorage;

  socklen_t addr_size;

  pid_t pid[50];

  //Create the socket.

  serverSocket = socket(PF_INET, SOCK_STREAM, 0);

  // Configure settings of the server address struct

  // Address family = Internet

  serverAddr.sin_family = AF_INET;

  //Set port number, using htons function to use proper byte order

  serverAddr.sin_port = htons(7799);

  //Set IP address to localhost

  serverAddr.sin_addr.s_addr = inet_addr("0.0.0.0");

  //Set all bits of the padding field to 0

  memset(serverAddr.sin_zero, '\0', sizeof serverAddr.sin_zero);

  //Bind the address struct to the socket

  bind(serverSocket, (struct sockaddr *) &serverAddr, sizeof(serverAddr));

  //Listen on the socket, with 50 max connection requests queued

  if(listen(serverSocket,50)==0)

    printf("Listening\n");

  else

    printf("Error\n");

    int i = 0;

while(1)

    {

        /* Accept call creates a new socket for the incoming connection */

        addr_size = sizeof serverStorage;

        newSocket = accept(serverSocket, (struct sockaddr *) &serverStorage, &addr_size);

        int pid_c = 0;

      if ((pid_c = fork())==0)

        {

          socketThread(newSocket);

        }

        else

        {

          pid[i++] = pid_c;

          if( i >= 49)

           {

             i = 0;

             while(i < 50)

                waitpid(pid[i++], NULL, 0);

             i = 0;

           }

        }

    }

  return 0;

}

#include <stdio.h>

#include <sys/socket.h>

#include <netinet/in.h>

#include <string.h>

#include <arpa/inet.h>

#include <stdlib.h>

#include <fcntl.h> // for open

#include <unistd.h> // for close

#include<pthread.h>

void * cientThread(void *arg)

{

  printf("In thread\n");

  char message[1000];

  char buffer[1024];

  int clientSocket;

  struct sockaddr_in serverAddr;

  socklen_t addr_size;

  // Create the socket. 

  clientSocket = socket(PF_INET, SOCK_STREAM, 0);

  //Configure settings of the server address

 // Address family is Internet 

  serverAddr.sin_family = AF_INET;

  //Set port number, using htons function 

  serverAddr.sin_port = htons(7799);

 //Set IP address to localhost

  serverAddr.sin_addr.s_addr = inet_addr("localhost");

  memset(serverAddr.sin_zero, '\0', sizeof serverAddr.sin_zero);

    //Connect the socket to the server using the address

    addr_size = sizeof serverAddr;

    connect(clientSocket, (struct sockaddr *) &serverAddr, addr_size);

    strcpy(message,"Hello");

   if( send(clientSocket , message , strlen(message) , 0) < 0)

    {

            printf("Send failed\n");

    }

    //Read the message from the server into the buffer

    if(recv(clientSocket, buffer, 1024, 0) < 0)

    {

       printf("Receive failed\n");

    }

    //Print the received message

    printf("Data received: %s\n",buffer);

    close(clientSocket);

    pthread_exit(NULL);

}

int main(){

  int i = 0;

  pthread_t tid[51];

  while(i< 50)

  {

    if( pthread_create(&tid[i], NULL, cientThread, NULL) != 0 )

           printf("Failed to create thread\n");

    i++;

  }

  sleep(20);

  i = 0;

  while(i< 50)

  {

     pthread_join(tid[i++],NULL);

     printf("%d:\n",i);

  }

  return 0;

} 

#include <stdio.h>

#include <stdlib.h>

#include <errno.h>

#include <sys/types.h>

#include <sys/inotify.h>

#include <unistd.h>

#define EVENT_SIZE  (sizeof(struct inotify_event))

#define BUF_LEN     (1024 * (EVENT_SIZE + 16))

int main(int argc, char **argv) {

    int length, i = 0;

    int fd;

    int wd;

    char buffer[BUF_LEN];

    fd = inotify_init();

    if (fd < 0) {

        perror("inotify_init");

    }

    wd = inotify_add_watch(fd, ".", // 현재 경로를 나타내며, 특정파일로 지정 가능합니다.

        IN_MODIFY | IN_CREATE | IN_DELETE);

    length = read(fd, buffer, BUF_LEN);

    if (length < 0) {

        perror("read");

    }

    while (i < length) {

        struct inotify_event *event =

            (struct inotify_event *) &buffer[i];

        if (event->len) {

            if (event->mask & IN_CREATE) {

                printf("The file %s was created.\n", event->name);

            } else if (event->mask & IN_DELETE) {

                printf("The file %s was deleted.\n", event->name);

            } else if (event->mask & IN_MODIFY) {

                printf("The file %s was modified.\n", event->name);

            }

        }

        i += EVENT_SIZE + event->len;

    }

    (void) inotify_rm_watch(fd, wd);

    (void) close(fd);

    return 0; 

}

#pragma warning(disable :4996)

#define MAX_LEN 100

#include <stdio.h>

int main()

{

    FILE* fs;

    fs = fopen("test.txt", "r");

    while (feof(fs) == 0) {

        char str[MAX_LEN];

        fgets(str, MAX_LEN, fs);

        printf("%s", str);

    }

}

<VirtualHost *:80>

    DocumentRoot "/home/zabbix/public_html"

    ServerName sysdocu.tistory.com

    ErrorLog "logs/sysdocu.tistory.com-error_log"

    CustomLog "logs/sysdocu.tistory.com-access_log" combined

</VirtualHost> 

DBHost=localhost

DBName=zabbix

DBUser=zabbix

DBPassword=12345678

DBSocket=/tmp/mysql.sock

Server=10.10.10.10 // 관리자 서버 IP 입력
Hostname=20.20.20.20 // 호스트 서버 IP 입력