A macOS connectx example

main.c

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

#define HOST_NAME "icanhazip.com"
#define HOST_IP "136.144.56.255"
#define HOST_PORT 80

int main(int argc, char **argv) {
	int soc = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
	if (soc < 0) {
		perror("ERROR: socket");
		return 1;
	}

	struct sockaddr_in addr;
	addr.sin_family = AF_INET;
	addr.sin_port = htons(HOST_PORT);
	addr.sin_len = sizeof(addr);
	inet_aton(HOST_IP, &addr.sin_addr);

	sa_endpoints_t endpoints;
	endpoints.sae_srcif = 0;
	endpoints.sae_srcaddr = NULL;
	endpoints.sae_srcaddrlen = 0;
	endpoints.sae_dstaddr = (struct sockaddr *)&addr;
	endpoints.sae_dstaddrlen = sizeof(addr);

	int result;
	result = connectx(soc, &endpoints, 0, 0, NULL, 0, NULL, NULL);
	if (result < 0) {
		perror("ERROR: connectx");
		close(soc);
		return 1;
	}

	char req[] =
		"GET / HTTP/1.1\r\n"
		"Host: " HOST_NAME "\r\n"
		"\r\n";
	result = write(soc, req, sizeof(req));
	if (result < 0) {
		perror("ERROR: write");
		close(soc);
		return 1;
	}

	char buf[1024];
	for (ssize_t size; (size = read(soc, buf, sizeof(buf)));) {
		if (size < 0) {
			perror("ERROR: read");
			close(soc);
			return 1;
		}
		for (size_t i = 0; i < size; i++) {
			printf("%c", buf[i]);
		}
	}

	close(soc);
	return 0;
}

line 52 should read ssize_t size, because else the condition in line 53 will never be true
(alternatively you could also cast size to ssize_t on line 53)

line 52 should read ssize_t size, because else the condition in line 53 will never be true
(alternatively you could also cast size to ssize_t on line 53)

Good call! Updated.