segfk.c

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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include "segfk.h"
 
void segfk_run(int port)
{
  int server_fd, client_fd;
  struct sockaddr_in addr;
  socklen_t addrlen = sizeof(addr);
  char response[] = "HTTP/1.1 200 OK\r\nContent-Type: text/html\r\nContent-Length: 13\r\nConnection: close\r\n\r\nHello, world!";
 
  server_fd = socket(AF_INET, SOCK_STREAM, 0);
  if (server_fd < 0) {
    perror("socket");
    exit(1);
  }
 
  int opt = 1;
  setsockopt(server_fd, SOL_SOCKET, SO_REUSEADDR, &opt, sizeof(opt));
 
  addr.sin_family = AF_INET;
  addr.sin_addr.s_addr = INADDR_ANY;
  addr.sin_port = htons(port);
 
  if (bind(server_fd, (struct sockaddr*)&addr, sizeof(addr)) < 0) {
    perror("bind");
    close(server_fd);
    exit(1);
  }
 
  if (listen(server_fd, 1) < 0) {
    perror("listen");
    close(server_fd);
    exit(1);
  }
 
  printf("Serving on port %d...\n", port);
  while (1) {
    client_fd = accept(server_fd, (struct sockaddr*)&addr, &addrlen);
    if (client_fd < 0) {
      perror("accept");
      continue;
    }
    send(client_fd, response, sizeof(response) - 1, 0);
    close(client_fd);
  }
  close(server_fd);
}