Linux上的一个简单的多人聊天室

在互联网上聊天对很多“网虫”来说已经是家常便饭了。聊天室程序可以说是网上最简单的多点通信程序。

花了很长时间用来联系掌握Linux 上Socket的一个聊天室程序，可以

点击这里下载Linux上的一个简单的多人聊天室 源代码

/*
 *i.h is a used for creating a library
 *for server client
 *Mar 18 2010 
 *
 */
#ifndef _I_H

#define _I_H

#include <math.h>
#include <stdio.h>
#include <sys/socket.h>
#include <arpa/inet.h>
#include <netinet/in.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <stdlib.h>
#include <errno.h>
#include <string.h>
#include <inttypes.h>
#include <time.h>
#include <sys/ioctl.h>
#include <net/if.h>
#include <signal.h>
#include <ncurses.h>
#include <math.h>

#define SEVR_IP     "127.0.0.1"
#define SEVR_PORT   8081
#define CNTNT_LEN   150
#define MSG_LEN     sizeof(struct msg)
#define ADDR_LEN    sizeof(struct sockaddr)
#define USR_LEN     sizeof(struct user)
#define PRT_LEN     8
#define HSTR_LEN    sizeof(struct chat_history)

/* declare Global variables */
int mainfd;/* used as chat histroy file handle*/
int sockfd;/* used as socket local handle */
int count;
struct sockaddr_in server;

/* msg is used for communicating message */
struct msg
{
 int flag; /* flag meaning:1,ordinary; 2,log msg; 3,reg msg, other,file*/
 int id_from;
 int id_to;
 char content[CNTNT_LEN];
 char append[10];
};

/* user is used information list */
struct user
{
 int id;
 char name[10];
 char password[10];
 char *p_chatlog;
 struct sockaddr user_addr; 
};
/* chat_history used for reading chat history */
struct chat_history
{
 char content[CNTNT_LEN];
 char time[25];
 int to;
 int from;
 int count;
};

/* i_functions below is funtions needed by both client and sever */
extern int i_saveto_chat(struct msg *pmsg);

int i_clean_stdin ()
{
 while ('\n' == getchar())
 {
  continue;
 }

return(0);
}

int i_print(char *pmsg, int size)
{
 int i = 1;

for (i; i<= size; i++)
 {
  if (*pmsg != '\n')
  {
   printf("%c", *pmsg);
   pmsg ++;
  }
  else
  {
   return(0);
  }
 }

return(0);
}
int i_input(char *p_input)
{
 char c = '\0';
 int i; 

for (i = 0; i < CNTNT_LEN; i++)
 {
  p_input[i] = getchar();
  if (p_input[i] =='\n')
  {
   return(0);  
  }  
 }

printf("you have input long enough!\n");
 return(0);
}
int i_socket(int domain, int type, int protocol)
{
 int fd; 

if ((fd = socket(domain, type, protocol)) == -1)
 {
  perror("creat socket error:");
  exit(1);
 }
 
 return(fd); 
}

int i_bind(int fd, const struct sockaddr *addr, int namelen)
{
 if (-1 == bind(fd, addr, namelen))
 {
  perror("i_bind error:");
  exit(1);
 }
 
 return (0);
}

int i_recvfrom(int fd, void *buf, size_t len, int flags,
  struct sockaddr *addr, int *size)
{ 
 if (-1 == recvfrom(fd, buf, len, flags, addr, size))
 {
  perror("i_recvfrom error:");
  exit(1); 
 }
 
 return(0);
}

int i_sendto(int fd, void *buf, size_t len, int flags,
  struct sockaddr *addr, int size)
{
 if (-1 == sendto(fd, buf, len, flags, addr, size))
 {
  perror("i_sendto error");
  exit(1); 
 }
 
 return (0);
}

int i_open(const char *pathname, int flags)
{
 int fd;
 if ((fd = open(pathname, flags)) == -1)
 {
  perror("open_failed");
  exit(1);
 }
 
 return (fd);
}
int i_read(int fd, void *msg, int len)
{
 if(-1 == read(fd, msg, len))
 {
  perror("i_read error");
  exit(1);
 }
 return(0);
}
int i_write(int fd, void *msg, int len)
{
 if (-1 == write(fd, msg, len))
 {
  perror("i_write error");
  exit(0);
 }
 return(0);
}

/* init a socket,file and server addr */
int i_init()
{
 mainfd = i_open("./chat_log", O_RDWR|O_CREAT);
 sockfd = i_socket(AF_INET, SOCK_DGRAM, 0);