TCPサーバー

svr.c

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

#define PORT 465

int main(int ac, char** av)
{
  int soc;
  struct sockaddr_in sa = {0};
  
  if((soc = socket(AF_INET, SOCK_STREAM, 0)) == -1)
  {
    perror("socket");
    return EXIT_FAILURE;
  }

  sa.sin_family = AF_INET;
  sa.sin_port = htons(PORT);
  sa.sin_addr.s_addr = htonl(INADDR_ANY);

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

  if(listen(soc, 32) == -1)
  {
    perror("listen");
    close(soc);
    return EXIT_FAILURE;
  }

  for(;;)
  {
    char recv_buf[1024];
    int recv_size;
    int fd;
    if((fd = accept(soc, NULL, NULL)) == -1)
    {
      perror("accept");
      close(soc);
      return EXIT_FAILURE;
    }

    if((recv_size = read(fd, recv_buf, sizeof(recv_buf) - 1)) == -1)
    {
      perror("read");
      close(soc);
      return EXIT_FAILURE;
    }
    recv_buf[recv_size] = '\0';
    puts(recv_buf);
    close(fd);
  }

  close(soc);

  return EXIT_SUCCESS;
}