#include "unp.h"## 1 ##src/names/daytimeudpcli1.c## int## 2 ##src/names/daytimeudpcli1.c## main(int argc, char **argv)## 3 ##src/names/daytimeudpcli1.c## {## 4 ##src/names/daytimeudpcli1.c## int sockfd, n;## 5 ##src/names/daytimeudpcli1.c## char recvline[MAXLINE + 1];## 6 ##src/names/daytimeudpcli1.c## socklen_t salen;## 7 ##src/names/daytimeudpcli1.c## struct sockaddr *sa;## 8 ##src/names/daytimeudpcli1.c## if (argc != 3)## 9 ##src/names/daytimeudpcli1.c## err_quit## 10 ##src/names/daytimeudpcli1.c## ("usage: daytimeudpcli1 ");## 11 ##src/names/daytimeudpcli1.c## sockfd = Udp_client(argv[1], argv[2], (void **) &sa, &salen);## 12 ##src/names/daytimeudpcli1.c## printf("sending to %s\n", Sock_ntop_host(sa, salen));## 13 ##src/names/daytimeudpcli1.c## Sendto(sockfd, "", 1, 0, sa, salen); /* send 1-byte datagram */## 14 ##src/names/daytimeudpcli1.c## n = Recvfrom(sockfd, recvline, MAXLINE, 0, NULL, NULL);## 15 ##src/names/daytimeudpcli1.c## recvline[n] = '\0'; /* null terminate */## 16 ##src/names/daytimeudpcli1.c## Fputs(recvline, stdout);## 17 ##src/names/daytimeudpcli1.c## exit(0);## 18 ##src/names/daytimeudpcli1.c## }## 19 ##src/names/daytimeudpcli1.c##