// test1.c - the part of TCP states test (FIN_WAIT1 + ESTABLISHED)

#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <signal.h>
#include <unistd.h>
#include <fcntl.h>
#include <stdio.h>

int main(int argc, char *argv[])
{
    int fd = socket(AF_INET, SOCK_STREAM, 0);
    int tmp = 100;
    struct sockaddr_in addr;
    addr.sin_addr.s_addr = INADDR_ANY;
    addr.sin_family = AF_INET;
    addr.sin_port = htons(6666);
    if (bind(fd, (struct sockaddr*)&addr, sizeof(addr)) == -1)
    {
        fprintf(stderr, "bind error\n");
        return 1;
    }
    if (listen(fd,10) == -1)
    {
        fprintf(stderr, "listen error\n");
        return 1;
    }
    socklen_t size = sizeof(addr);
    int fd2 = accept(fd, (struct sockaddr*)&addr, &size);
    if (fd2 == -1)
    {
        fprintf(stderr, "accept error\n");
        return 1;
    }

    fcntl(fd2, F_SETFL, O_NONBLOCK);
    while (write(fd2,&tmp,sizeof(tmp)) != -1) ;
    close(fd2);
    while (1) {
        sleep(1);
    }

    return 0;
}