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- /*
- ** server.c -- a stream socket server demo
- */
- #include <stdio.h>
- #include <stdlib.h>
- #include <unistd.h>
- #include <errno.h>
- #include <string.h>
- #include <sys/types.h>
- #include <sys/socket.h>
- #include <netinet/in.h>
- #include <arpa/inet.h>
- #define MYPORT 3499 // the port users will be connecting to
- #define BACKLOG 10 // how many pending connections queue will hold
- int main(void)
- {
- 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;
- int yes=1;
- if ((sockfd = socket(AF_INET, SOCK_STREAM, 0)) == -1) {
- perror("socket");
- exit(1);
- }
- if (setsockopt(sockfd, SOL_SOCKET, SO_REUSEADDR, &yes, sizeof(int)) == -1) {
- perror("setsockopt");
- exit(1);
- }
- 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; // automatically fill with my IP
- memset(&(my_addr.sin_zero), '\0', 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);
- }
- while(1) { // main accept() loop
- sin_size = sizeof(struct sockaddr_in);
- if ((new_fd = accept(sockfd, (struct sockaddr *)&their_addr, &sin_size)) == -1) {
- perror("accept");
- continue;
- }
- printf("server: got connection from %s\n",inet_ntoa(their_addr.sin_addr));
- if (send(new_fd, "Hello, world!\n", 14, 0) == -1)
- perror("send");
- close(new_fd);
- }
- return 0;
- }
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