Bind and listen on a Berkley socket

bind_and_listen.c

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

int bind_and_listen (int port, int backlog) {
  int listen_fd = socket(PF_INET, SOCK_STREAM, IPPROTO_TCP);
  if (listen_fd == -1) {
    perror("socket");
    return -1;
  }

  struct sockaddr_in sa;
  bzero(&sa, sizeof(sa));
  sa.sin_family = AF_INET;
  sa.sin_port = htons(port);
  sa.sin_addr.s_addr = htonl(INADDR_ANY);

  if (bind(listen_fd, (struct sockaddr *)&sa, sizeof(sa)) == -1) {
    perror("bind");
    return -1;
  }

  if (listen(listen_fd, backlog) == -1) {
    perror("listen");
    return -1;
  }
  
  return listen_fd;
};