Unix IPC socket: closing one end without reading from it

I have a parent process and a forked child process, and they share the IPC Unix domain socket created with socketpair(AF_UNIX, SOCK_STREAM, 0, sockets). Both processes close one end of the socket socket and store the other end in a variable sock. After that they do this:

int sock; // Unix-domain socket

void child_main()
{
  printf("I am child\n");      
  sleep(1);      
  close(sock);
}

void parent_main()
{
  printf("I am parent\n");

  write(sock, "hello", 5);

  char buf[100];
  int ret = read(sock, buf, 100); // this read will return ECONNRESET
  if (ret == -1) { 
    perror("read");
    exit(-1);
  }
}

The parent process writes some data to the socket, but the child does not read it. Instead, the child closes the socket. Now I am concerned that readthe parent process exited with ECONNRESET (Connection reset by peer), while I expect it to return "0" indicating the end of the stream. Because the other end of the socket was gracefully closed, calling close.

, ( ECONNRESET), ? man read ECONNRESET, :

, fd

unix :

ECONNRESET: .

Unix- IPC-, , , .

" " : , , close , , , ? ? ​​, ?