linux系统父子进程共享端口


linux系统父子进程共享端口
 
nginx 就是使用了父子进程 共享端口,所以nginx快速这个也算一个原因 
 
#include <unistd.h> 
#include <stdlib.h> 
#include <sys/types.h> 
#include <stdio.h> 
#include <sys/socket.h> 
#include <netinet/in.h> 
#include <string.h> 
 
int main() 
int sfp,nfp; 
struct sockaddr_in s_add,c_add; 
int sin_size; 
unsigned short portnum=8888; 
 
printf("Hello,welcome to my server !\r\n"); 
sfp = socket(AF_INET, SOCK_STREAM, 0); 
if(-1 == sfp) 
    printf("socket fail ! \r\n"); 
    return -1; 
printf("socket ok !\r\n"); 
 
 
bzero(&s_add,sizeof(struct sockaddr_in)); 
s_add.sin_family=AF_INET; 
s_add.sin_addr.s_addr=htonl(INADDR_ANY); 
s_add.sin_port=htons(portnum); 
 
if(-1 == bind(sfp,(struct sockaddr *)(&s_add), sizeof(struct sockaddr))) 
    printf("bind fail !\r\n"); 
    return -1; 
printf("bind ok !\r\n"); 
 
if(-1 == listen(sfp,5)) 
    printf("listen fail !\r\n"); 
    return -1; 
printf("listen ok\r\n"); 
 
fork(); 
while(1) 
sin_size = sizeof(struct sockaddr_in); 
 
nfp = accept(sfp, (struct sockaddr *)(&c_add), &sin_size); 
printf("\t\t\t\t\t\tprocess is %ld\n",(long)getpid()); 
if(-1 == nfp) 
    printf("accept fail !\r\n"); 
    return -1; 
printf("accept ok!\r\nServer start get connect from %#x : %#x\r\n",ntohl(c_add.sin_addr.s_addr),ntohs(c_add.sin_port)); 
 
 
if(-1 == write(nfp,"hello,welcome to my server \r\n",32)) 
    printf("write fail!\r\n"); 
    return -1; 
printf("write ok!\r\n"); 
close(nfp); 
 
close(sfp); 
return 0; 
 
客户端 
#include <stdlib.h> 
#include <sys/types.h> 
#include <stdio.h> 
#include <sys/socket.h> 
#include <netinet/in.h> 
#include <string.h> 
 
int main() 
int cfd; 
int recbytes; 
int sin_size; 
char buffer[1024]={0};   
struct sockaddr_in s_add,c_add; 
unsigned short portnum=8888; 
 
printf("Hello,welcome to client !\r\n"); 
 
cfd = socket(AF_INET, SOCK_STREAM, 0); 
if(-1 == cfd) 
    printf("socket fail ! \r\n"); 
    return -1; 
printf("socket ok !\r\n"); 
 
bzero(&s_add,sizeof(struct sockaddr_in)); 
s_add.sin_family=AF_INET; 
s_add.sin_addr.s_addr= inet_addr("127.0.0.1"); 
s_add.sin_port=htons(portnum); 
printf("s_addr = %#x ,port : %#x\r\n",s_add.sin_addr.s_addr,s_add.sin_port); 
 
 
if(-1 == connect(cfd,(struct sockaddr *)(&s_add), sizeof(struct sockaddr))) 
    printf("connect fail !\r\n"); 
    return -1; 
printf("connect ok !\r\n"); 
 
if(-1 == (recbytes = read(cfd,buffer,1024))) 
    printf("read data fail !\r\n"); 
    return -1; 
printf("read ok\r\nREC:\r\n"); 
 
buffer[recbytes]='\0'; 
printf("%s\r\n",buffer); 
 
getchar(); 
close(cfd); 
return 0; 
 
分别多次运行客户端,可以发现显示的进程号是不同的 
 
Hello,welcome to my server ! 
socket ok ! 
bind ok ! 
listen ok 
process is 3277 
accept ok! 
Server start get connect from 0x7f000001 : 0xc67d 
write ok! 
process is 3278 
accept ok! 
Server start get connect from 0x7f000001 : 0xc681 
write ok! 
process is 3277 
accept ok! 
Server start get connect from 0x7f000001 : 0xc682 
write ok! 
process is 3278 
accept ok! 
Server start get connect from 0x7f000001 : 0xc683 
write ok! 
 

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