Socket, code example

간단히 ... 잊지 않을 정도의 코드 예제를 적어본다.
server side

#include <unistd.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <sys/types.h>
#include <sys/socket.h>

int sfd, rsfd;
struct sockaddr saddr; // listener
struct sockaddr rsaddr;

sfd = socket(AF_INET, SOCK_STREAM, IPPROTO_IP);

saddr.sin_family                = AF_INET;
saddr.sin_port          = 10000;
saddr.sin_addr.s_addr   = inet_addr("100.100.100.100");
// or inet_aton

bind(sfd, (struct sockaddr*)&saddr, sizeof(saddr));

listen(sfd, BACKLOG);

rsfd = accept(sfd, (struct sockaddr *)&saddr, &len_rsaddr);

recv(rsfd, rbuf, sizeof(rbuf), 0);

send(rsfd, sbuf, sizeof(sbuf), 0);

shutdown(rsfd, SHUT_RDWR); // or close

client side

#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <sys/socket.h>

int sfd;
struct sockaddr saddr;

sfd = socket(AF_INET, SOCK_STREAM, IPPROTO_IP);

saddr.sin_family                = AF_INET;
saddr.sin_port          = 10000;
inet_aton("100.100.100.100", &saddr.sin_addr);
// or inet_addr

connect(sfd, (struct sockaddr*)saddr, sizeof(saddr));

send(sfd, sbuf, sizeof(sbuf), 0);

recv(sfd, rbuf, sizeof(rbuf), 0);

close(sfd); // or shutdown