server.c

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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include <unistd.h>
#include <signal.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <sys/types.h>
#include <sys/socket.h>

#define MAXLINE 256

void serve_client(int fd, struct sockaddr_in *cli)
{
	char buf[MAXLINE];
	char str[INET_ADDRSTRLEN];
	int i, len;

	while (read(fd, buf, MAXLINE)) {
		printf("receiv from client %s at port %d: %s",
				inet_ntop(PF_INET, &(cli->sin_addr), str, sizeof(str)),
				ntohs(cli->sin_port), buf);
		len = strlen(buf);
		for (i=0; i<len; i++) buf[i] = toupper(buf[i]);
		write(fd, buf, len+1);
	}
	printf("close client at port %d\n", ntohs(cli->sin_port));
	close(fd);
}
int main()
{
	struct sockaddr_in serv, cli;
	int listenfd, connectfd;
	pid_t pid;

	signal(SIGCHLD, SIG_IGN);

	bzero(&serv, sizeof(serv));
	serv.sin_family = PF_INET;
	serv.sin_port = htons(8000);
	serv.sin_addr.s_addr = htonl(INADDR_ANY);

	listenfd = socket(PF_INET, SOCK_STREAM, 0);
	bind(listenfd, (struct sockaddr *)&serv, sizeof(serv));
	listen(listenfd, 100);
	printf("Accepting connection...\n");

	while (1) {
		socklen_t clilen = sizeof(cli);
		bzero(&cli, sizeof(cli));
		connectfd = accept(listenfd, (struct sockaddr *)&cli, &clilen);
		pid = fork();
		if (pid<0) { perror("fork"); exit(1); }
		else if (pid) close(connectfd); /* parent */
		else {                          /* child */
			close(listenfd);
			serve_client(connectfd, &cli);
			exit(1);
		}
	}
	exit(0);
}