aio_write does not work in my simple client/server proggram - c

Question

I am starting to use aio to write a simple client server program.My client program:
int main(int argc, char const *argv[])
{
int port = 6000;
struct sockaddr_in my_address;
memset(&my_address, 0, sizeof(my_address));
my_address.sin_family = AF_INET;
my_address.sin_addr.s_addr = htonl(0x7f000001); // 127.0.0.1
my_address.sin_port = htons(port);
int fd = socket(AF_INET, SOCK_STREAM, 0);
connect(fd, (struct sockaddr*)&my_address, sizeof(my_address));
char * str = "hello";
struct aiocb my_aio;
memset((void*)&my_aio, 0, sizeof(struct aiocb));
my_aio.aio_fildes = fd;
my_aio.aio_buf = str;
my_aio.aio_nbytes = strlen(str);
aio_write(&my_aio);
return 0;
}
My server program:
int main(int argc, char *argv[])
{
int sockfd, newsockfd, portno, clilen;
char buffer[256];
struct sockaddr_in serv_addr, cli_addr;
int n;
if (argc < 2) {
fprintf(stderr,"ERROR, no port provided\n");
}
sockfd = socket(AF_INET, SOCK_STREAM, 0);
if (sockfd < 0)
error("ERROR opening socket");
bzero((char *) &serv_addr, sizeof(serv_addr));
portno = atoi(argv[1]);
serv_addr.sin_family = AF_INET;
serv_addr.sin_addr.s_addr = INADDR_ANY;
serv_addr.sin_port = htons(portno);
if (bind(sockfd, (struct sockaddr *) &serv_addr,sizeof(serv_addr)) < 0)
error("ERROR on binding");
listen(sockfd,5);
clilen = sizeof(cli_addr);
newsockfd = accept(sockfd, (struct sockaddr *) &cli_addr, &clilen);
sleep(5);
bzero(buffer,256);
n = read(newsockfd,buffer,255);
if (n < 0) error("ERROR reading from socket");
printf("Here is the message: %s\n",buffer);
return 0;
}
I expect my server side to print out hello, but it does not. Thanks in advance.

Answer 1

Your code works otherwise, but your main is exited before the asynchronous write has completed; thus the socket is closed before the completion of asynchronous write. I did as little as add a perror("aio_write") after the aio_write call to find out what error it was giving if any, and now hello was successfully sent to the server.
You'd probably want to use aio_suspend to ensure that any outstanding operations are completed before exiting the main.