Berkeley Sockets: Zeitansage

timeserver.c

#include <netdb.h> #include <netinet/in.h> #include <stdio.h> #include <string.h> #include <strings.h> #include <sys/socket.h> #include <sys/time.h> #include <time.h> #include <unistd.h> #define PORT 11011 int main () { struct sockaddr_in address, client_addr; size_t client_addr_len = sizeof client_addr; int sfd, fd; int optval = 1; bzero(&address, sizeof(struct sockaddr_in)); address.sin_family = AF_INET; address.sin_port = htons(PORT); if ((sfd = socket(AF_INET, SOCK_STREAM, 0)) < 0 || setsockopt(sfd, SOL_SOCKET, SO_REUSEADDR, &optval, sizeof optval) < 0 || bind(sfd, (struct sockaddr *) &address, sizeof(struct sockaddr_in)) < 0 || listen(sfd, SOMAXCONN) < 0) { perror("socket"); exit(1); } while ((fd = accept(sfd, (struct sockaddr *) &client_addr, &client_addr_len)) >= 0) { char timebuf[32]; time_t clock; time(&clock); ctime_r(&clock, timebuf, sizeof timebuf); write(fd, timebuf, strlen(timebuf)); close(fd); } }