#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <unistd.h>
#include <ctype.h>
#include <sys/socket.h>
#include <arpa/inet.h>
#include "iolib.h"
#define MAX_LINE 100
void my_fun(char * p)
{
if(p == NULL) /* 空串 */
return;
for (; *p != '\0'; p++)
if(*p >= 'A'&& *p <= 'Z')
*p = *p -'A'+ 'a';
}
int main(void)
{
struct sockaddr_in sin;
struct sockaddr_in cin;
int l_fd;
int c_fd;
socklen_t len;
char buf[MAX_LINE];
char addr_p[INET_ADDRSTRLEN];
int port = 8000;
int n;
bzero(&sin, sizeof(sin));
sin.sin_family = AF_INET;
sin.sin_addr.s_addr = INADDR_ANY;
sin.sin_port = htons(port);
if( (l_fd = socket(AF_INET, SOCK_STREAM, 0)) == -1){
perror("fail to creat socket");
exit(1);
}
if(bind(l_fd, (struct sockaddr *) &sin, sizeof(sin)) == -1){
perror("fail to bind");
exit(1);
}
if(listen(l_fd, 10) == -1){
perror("fail to listen");
exit(1);
}
printf("waiting ...\n");
while(1){
if( (c_fd = accept(l_fd, (struct sockaddr *) &cin, &len)) == -1){
perror("fail to accept");
exit(1);
}
n = my_read(c_fd, buf, MAX_LINE);
if(n == -1)
exit(1);
else if(n == 0){
printf("the connect has been closed\n");
close(c_fd);
continue;
}
inet_ntop(AF_INET, &cin.sin_addr, addr_p, sizeof(addr_p));
printf("client IP is %s, port is %d\n", addr_p, ntohs(cin.sin_port));
printf("content is : %s\n", buf);
my_fun(buf);
n = my_write(c_fd, buf, n);
if(n == -1){
exit(1);
}
if(close(c_fd) == -1){
perror("fail to close");
exit(1);
}
}
if(close(l_fd) == -1){
perror("fail to close");
exit(1);
}
return 0;
}
chapter_23.rar （12个子文件） 
chapter_23 23-7 
client.c 1KB iolib.c 701B server.c 2KB iolib.h 124B 23-11 client.c 1KB server.c 2KB 23-5 client.c 1KB server.c 1KB client.c.bak 1KB server.c.bak 1KB iolib iolib.c 701B iolib.h 124B资源评论
