Berkeley Sockets: Ein einfacher Klient

client.c

#include <netdb.h> #include <netinet/in.h> #include <stdio.h> #include <string.h> #include <strings.h> #include <sys/socket.h> #include <unistd.h> #define PORT 11011 int main (int argc, char ** argv) { struct sockaddr_in addr; int fd; struct hostent * hp; char * hostname = argv[1]; char buffer[BUFSIZ]; ssize_t nbytes; if ((hp = gethostbyname(hostname)) == NULL) { fprintf(stderr, "unknown host: %s\n", hostname); exit(1); } bzero(&addr, sizeof(struct sockaddr_in)); addr.sin_family = AF_INET; bcopy(hp->h_addr, (void *) &addr.sin_addr, hp->h_length); addr.sin_port = htons(PORT); if ((fd = socket(AF_INET, SOCK_STREAM, 0)) < 0) { perror("socket"); exit(1); } if (connect(fd, (struct sockaddr *) &addr, sizeof addr) < 0) { perror("connect"); exit(1); } while((nbytes = read(fd, buffer, sizeof buffer)) > 0 && write(1, buffer, nbytes) == nbytes); exit(0); }