client.c

// Source: https://book.systemsapproach.org/foundation/software.html

#include <stdio.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netdb.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>

#define SERVER_PORT 5432

int main(int argc, char * argv[])
{
  struct hostent *hp;
  struct sockaddr_in sin;
  char *host;
  unsigned char buf[64];
  int s;
	int requests = 100000;
	int i;

	if (argc != 2) {
		printf("Usage: <ip-address-of-server>\n");
		exit(0);
	}
  host = argv[1];

  /* translate host name into peer's IP address */
  hp = gethostbyname(host);
  if (!hp) {
    fprintf(stderr, "simplex-talk: unknown host: %s\n", host);
    exit(1);
  }

  /* build address data structure */
  bzero((char *)&sin, sizeof(sin));
  sin.sin_family = AF_INET;
  bcopy(hp->h_addr, (char *)&sin.sin_addr, hp->h_length);
  sin.sin_port = htons(SERVER_PORT);

  /* active open */
  if ((s = socket(PF_INET, SOCK_STREAM, 0)) < 0) {
    perror("socket");
    exit(1);
  }
  if (connect(s, (struct sockaddr *)&sin, sizeof(sin)) < 0)
  {
    perror("connect");
    close(s);
    exit(1);
  }

	for (i = 0; i < requests; i++) {
		memset(buf, 0x7f, sizeof(buf));
		if (send(s, buf, sizeof(buf), 0) != sizeof(buf)) {
			perror("send failed\n");
		}
	}

	close(s);
	return 0;
}