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peek_send.c
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peek_send.c
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#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <string.h>
#include <sys/socket.h>
#include <arpa/inet.h>
void error_handling(char *message);
int main(int argc, char *argv[])
{
int sock;
struct sockaddr_in send_adr;
if (argc != 3)
{
printf("Usage : %s <IP> <port>\n", argv[0]);
exit(1);
}
sock = socket(PF_INET, SOCK_STREAM, 0);
memset(&send_adr, 0, sizeof(send_adr));
send_adr.sin_family = AF_INET;
send_adr.sin_addr.s_addr = inet_addr(argv[1]);
send_adr.sin_port = htons(atoi(argv[2]));
if (connect(sock, (struct sockaddr *)&send_adr, sizeof(send_adr)) == -1)
error_handling("connect() error");
write(sock, "123", strlen("123"));
close(sock);
return 0;
}
void error_handling(char *message)
{
fputs(message, stderr);
fputc('\n', stderr);
exit(1);
}