聊天程序(server 和client)

exit(1);
}
//XXX: step 3: create a bind
struct sockaddr_in server_address;
memset(&server_address, 0, sizeof(server_address));
server_address.sin_family = PF_INET; //IPV4 address,
}
//XXX: step 6: create a fork
pid_t pid;
if ((pid = fork()) < 0)
{
fprintf(stderr, "fork() failed:%s\n", strerror(errno));
again:
if ((written = write (fd, request, strlen(request))) < 0)// 写程序，也可以用send()代替.
{
if (errno == EINTR)
{
fprintf(stderr, "write was closed by signal\n");
}
char buffer[BUFFER_SIZE];
ssize_t n;
for(;;)
{
if ((n = read (fd, buffer, BUFFER_SIZE)) < 0)
{
fprintf(stderr, "recv() failed:%s\n", strerror(errno));
}
}
close(fd);
close(new_fd);
return 0;
}
int child_process(int fd)
{
ssize_t written;
char *request = "Hello, welcome to my char program!\n";
int main (int argc, char **argv)
{
int global_connect_number = 0;
//XXX: step 1: check the argc
if (argc < 3)
{
fprintf(stderr, "Usage: %s<ipaddress><port>\n", strerror(errno));
exit(1);
}
else if (n == 0)
{
fprintf(stderr, "connection was closed by peer\n");
close(fd);
break;
}
else
{
buffer[n] = '\0';
{
fprintf(stderr, "accept failed():%s\n", strerror(errno));
exit(1);
}
else
{
fprintf(stdout, "accept a new TCP connect %d from %s:%d\n", new_fd, inet_ntoa(remote_address.sin_addr), ntohs(remote_address.sin_port));
{
fprintf(stderr, "getpeername() failed:%s\n", strerror(errno));
exit(1);
}
else
{
fprintf(stdout, "On socket %d(%s:%d):%s\n", fd,inet_ntoa(peer_address.sin_addr),ntohs(peer_address.sin_port), buffer);
int new_fd;
socklen_t address_len;
struct sockaddr_in remote_address;
address_len = sizeof(remote_address);
for(;;)
{
if ((new_fd = accept(fd, (struct sockaddr *)&remote_address,&address_len)) < 0)
struct sockaddr_in peer_address;
socklen_t peer_len;
peer_len = sizeof(peer_address);
if (getpeername(fd, (struct sockaddr *)&peer_address, &peer_len) < 0)
server_address.sin_port = htons(atoi(argv[2]));
server_address.sin_addr.s_addr = inet_addr(argv[1]);
if (bind(fd, (struct sockaddr *)&server_address, sizeof(server_address)) < 0)
}
}
}
close(fd);
free(buffer);
return 0;
}
goto again;
}
else
{
fprintf(stderr, "write failed:%s\n", strerror(errno));
exit(1);
}
}
else
{
fprintf(stdout, "write successd!\n");
{
fprintf(stderr, "bind failed:%s\n", strerror(errno));
exit(1);
}
if (listen(fd, LISTENQ) < 0)
{
fprintf(stderr,"listen failed:%s\n", strerror(errno));
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <sys/types.h>
#in
#include <arpa/inet.h>
#include <errno.h>
exit(1);
}
//XXX: step 2: create a socket
int fd;
if ((fd = socket(PF_INET, SOCK_STREAM, 0)) < 0)
{
fprintf(stderr, "socket failed:%s\n", strerror(errno));
exit(1);
}
else
{
fprintf(stdout, "socket is listening the port:%s:%d\n", argv[1],atoi(argv[2]));
}
//XXX: step 5: create a accept
exit(1);
}
else if (pid == 0)
{
//CHILD PROCESS
child_process(new_fd);
exit(0);
}
else //父进程。
{
//PARENT PROCESS
fprintf(stdout, "%d have connection of %d\n", getpid(), global_connect_number++);