aio_write 在我的简单 client/server 程序中不起作用
aio_write does not work in my simple client/server proggram
开始使用aio写一个简单的客户端服务器program.My客户端程序:
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;
}
我的服务器程序:
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;
}
我希望我的服务器端打印出 hello,但它没有。提前致谢。
您的代码可以正常工作,但是您的 main
在异步写入完成之前退出;因此套接字在异步写入完成之前关闭。我只是在 aio_write
调用之后添加了一个 perror("aio_write")
来找出它给出的错误(如果有的话),现在 hello
已成功发送到服务器。
您可能希望使用 aio_suspend
来确保在退出 main
之前完成任何未完成的操作。
开始使用aio写一个简单的客户端服务器program.My客户端程序:
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;
}
我的服务器程序:
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;
}
我希望我的服务器端打印出 hello,但它没有。提前致谢。
您的代码可以正常工作,但是您的 main
在异步写入完成之前退出;因此套接字在异步写入完成之前关闭。我只是在 aio_write
调用之后添加了一个 perror("aio_write")
来找出它给出的错误(如果有的话),现在 hello
已成功发送到服务器。
您可能希望使用 aio_suspend
来确保在退出 main
之前完成任何未完成的操作。