michaels_stuck_tcp.c
rrs (Randall Stewart)
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	rrs
	May 13 2020, 3:18 PM

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870 B

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michaels_stuck_tcp.c
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	#include <sys/types.h>
	#include <sys/socket.h>
	#include <netinet/in.h>
	#include <netinet/tcp.h>
	#include <arpa/inet.h>
	#include <stdio.h>
	#include <string.h>
	#include <unistd.h>

	int
	main(void)
	{
	struct sockaddr_in addr;
	const char c = 'A';
	const int on = 1;
	int fd;

	if ((fd = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP)) < 0) {
	perror("socket");
	}
	memset(&addr, 0, sizeof(struct sockaddr_in));
	addr.sin_family = AF_INET;
	addr.sin_len = sizeof(struct sockaddr_in);
	addr.sin_port = htons(80);
	addr.sin_addr.s_addr = inet_addr("0.0.0.9");
	if (setsockopt(3, IPPROTO_TCP, TCP_FASTOPEN, (const void *)&on, (socklen_t)sizeof(int)) != 0) {
	perror("setsockopt");
	}
	if (sendto(fd, &c, sizeof(char), 0, (const struct sockaddr *)&addr, (socklen_t)sizeof(struct sockaddr_in)) < 0) {
	perror("sendto");
	}
	if (close(fd) < 0) {
	perror("close");
	}
	return (0);
	}