socket——tcp-nonblocking-server-client

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http://www.cs.tau.ac.il/~eddiea/samples/

server.c
http://www.cs.tau.ac.il/~eddiea/samples/Non-Blocking/tcp-nonblocking-server.c.html

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// gcc server.c -o server
// indent -npro -kr -i8 -ts8 -sob -l280 -ss -ncs -cp1 *
/***************************************************************************/
/* */
/* Server program which wait for the client to connect and reads the data */
/* using non-blocking socket. */
/* The reading of non-blocking sockets is done in a loop until data */
/* arrives to the sockfd. */
/* */
/* based on Beej's program - look in the simple TCP server for further doc.*/
/* */
/* */
/***************************************************************************/
#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <string.h>
#include <sys/types.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <sys/socket.h>
#include <sys/wait.h>
#include <fcntl.h> /* Added for the nonblocking socket */
#define MYPORT 3456 /* the port users will be connecting to */
#define BACKLOG 10 /* how many pending connections queue will hold */
int main()
{
int sockfd, new_fd; /* listen on sock_fd, new connection on new_fd */
struct sockaddr_in my_addr; /* my address information */
struct sockaddr_in their_addr; /* connector's address information */
int sin_size;
char string_read[255];
int n, i;
int last_fd; /* Thelast sockfd that is connected */
if ((sockfd = socket(AF_INET, SOCK_STREAM, 0)) == -1) {
perror("socket");
exit(1);
}
last_fd = sockfd;
my_addr.sin_family = AF_INET; /* host byte order */
my_addr.sin_port = htons(MYPORT); /* short, network byte order */
my_addr.sin_addr.s_addr = INADDR_ANY; /* auto-fill with my IP */
bzero(&(my_addr.sin_zero), 8); /* zero the rest of the struct */
if (bind(sockfd, (struct sockaddr *)&my_addr, sizeof(struct sockaddr)) == -1) {
perror("bind");
exit(1);
}
if (listen(sockfd, BACKLOG) == -1) {
perror("listen");
exit(1);
}
if ((new_fd = accept(sockfd, (struct sockaddr *)&their_addr, &sin_size)) == -1) {
perror("accept");
}
fcntl(last_fd, F_SETFL, O_NONBLOCK); /* Change the socket into non-blocking state */
fcntl(new_fd, F_SETFL, O_NONBLOCK); /* Change the socket into non-blocking state */
while (1) {
for (i = sockfd; i <= last_fd; i++) {
printf("Round number %d\n", i);
if (i = sockfd) {
sin_size = sizeof(struct sockaddr_in);
if ((new_fd = accept(sockfd, (struct sockaddr *)&their_addr, &sin_size)) == -1) {
perror("accept");
}
printf("server: got connection from %s\n", inet_ntoa(their_addr.sin_addr));
fcntl(new_fd, F_SETFL, O_NONBLOCK);
last_fd = new_fd;
} else {
n = recv(new_fd, string_read, sizeof(string_read), 0);
if (n < 1) {
perror("recv - non blocking \n");
printf("Round %d, and the data read size is: n=%d \n", i, n);
} else {
string_read[n] = '\0';
printf("The string is: %s \n", string_read);
if (send(new_fd, "Hello, world!\n", 14, 0) == -1)
perror("send");
}
}
}
}
return 0;
}

client.c
http://www.cs.tau.ac.il/~eddiea/samples/Non-Blocking/tcp-nonblocking-client.c.html

点击(此处)折叠或打开

// gcc client.c -o client
// indent -npro -kr -i8 -ts8 -sob -l280 -ss -ncs -cp1 *
#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <string.h>
#include <netdb.h>
#include <sys/types.h>
#include <netinet/in.h>
#include <sys/socket.h>
#include <unistd.h>
#define PORT 3456 /* the port client will be connecting to */
#define MAXDATASIZE 100 /* max number of bytes we can get at once */
int main(int argc, char *argv[])
{
int sockfd, numbytes;
char buf[MAXDATASIZE];
struct hostent *he;
struct sockaddr_in their_addr; /* connector's address information */
if (argc != 2) {
fprintf(stderr, "usage: client hostname\n");
exit(1);
}
if ((he = gethostbyname(argv[1])) == NULL) { /* get the host info */
herror("gethostbyname");
exit(1);
}
if ((sockfd = socket(AF_INET, SOCK_STREAM, 0)) == -1) {
perror("socket");
exit(1);
}
their_addr.sin_family = AF_INET; /* host byte order */
their_addr.sin_port = htons(PORT); /* short, network byte order */
their_addr.sin_addr = *((struct in_addr *)he->h_addr);
bzero(&(their_addr.sin_zero), 8); /* zero the rest of the struct */
if (connect(sockfd, (struct sockaddr *)&their_addr, sizeof(struct sockaddr)) == -1) {
perror("connect");
exit(1);
}
/* sleep(5); */
while (1) {
if (send(sockfd, "Hello, world!\n", 14, 0) == -1)
perror("send");
printf("In loop \n");
sleep(2);
}
close(sockfd);
return 0;
}

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