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- #include <sys/types.h>
- #include <sys/socket.h>
- #include <netinet/in.h>
- #include <arpa/inet.h>
- #include <string.h>
- #include <stdio.h>
- #include <stdlib.h>
- #include <unistd.h>
- #define MAX_BUF 100
- int main(int argc, char* argv[])
- {
- int sockd;
- struct sockaddr_in my_addr, srv_addr;
- char buf[MAX_BUF];
- int buff;
- int count;
- int addrlen;
- if (argc < 3)
- {
- fprintf(stderr, "Usage: %s ip_address port_number\n", argv[0]);
- exit(1);
- }
- /* create a socket */
- sockd = socket(AF_INET, SOCK_DGRAM, 0);
- if (sockd == -1)
- {
- perror("Socket creation error");
- exit(1);
- }
- /* client address */
- my_addr.sin_family = AF_INET;
- my_addr.sin_addr.s_addr = INADDR_ANY;
- my_addr.sin_port = 0;
- bind(sockd, (struct sockaddr*)&my_addr, sizeof(my_addr));
- strcpy(buf, "Hello world\n");
- /* server address */
- srv_addr.sin_family = AF_INET;
- inet_aton(argv[1], &srv_addr.sin_addr);
- srv_addr.sin_port = htons(atoi(argv[2]));
- scanf("%d", &buff);
- buff=htonl(buff);
- sendto(sockd,(char *) &buff, sizeof(int), 0,
- (struct sockaddr*)&srv_addr, sizeof(srv_addr));
- addrlen = sizeof(srv_addr);
- count = recvfrom(sockd, (char *) &buff, sizeof(int), 0,
- (struct sockaddr*)&srv_addr, &addrlen);
- buff=ntohl(buff);
- printf("%d", buff);
- //buf=atoi(buff);
- //write(1,buf, count);
- close(sockd);
- return 0;
- }
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