* Crossposted in OS2PROG
* Crossposted in OS2.PROG.GER
* Crossposted in OS2NET.PROGRAMMIERUNG.GER

======================================================================
* Forwarded von Thomas Seeling (2:244/1130.42)
* Area : emx
======================================================================
From: "Hans-Michael Stahl" 


Sockets created with address family AF_UNIX disappear after a fork if the parent
does an exec but the child keeps listening to the socket. Is this intended
behaviour ?

The doc clearly says "socket handles are not inherited across exec and
spawn",
but I do a fork before and the doc says "Note that a process created by fork()
inherits the socket handles of its parent process".

Here's the code:

  sock = socket(AF_UNIX, SOCK_STREAM, 0);
  if (sock < 0)
    {
      perror("socket");
      goto fail_socket_setup;
    }
  memset(&sunaddr, 0, AF_UNIX_SIZE(sunaddr));
  sunaddr.sun_family = AF_UNIX;
  strncpy(sunaddr.sun_path, socket_name, sizeof(sunaddr.sun_path));
  if (bind(sock, (struct sockaddr *)&sunaddr, AF_UNIX_SIZE(sunaddr)) < 0)
    {
      perror("bind");
      close(sock);
      goto fail_socket_setup;
    }
  if (listen(sock, 5) < 0)
    {
      perror("listen");
      close(sock);
      goto fail_socket_setup;
    }
  /* Everything ok so far, so permit forking. */
  creation_failed = 0;

fail_socket_setup:
  /* If not creation_failed, fork, and have the parent execute the command.
     The child continues as the authentication agent. If creation failed,
     don't fork the child and forget the socket */
  if (creation_failed || fork() != 0)
    { /* Parent - execute the given command. */
      if (!creation_failed)
        {
          sprintf(buf, "SSH_AUTHENTICATION_SOCKET=%s", socket_name);
    putenv(buf);
        }
      /* >>>> under OS/2 execvp makes the socket disappear!
<<<<< */
      execvp(av[1], av + 1); 
<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
      perror(av[1]);
      exit(1);
    }
  new_socket(AUTH_SOCKET, sock);
  signal(SIGALRM, check_parent_exists);
 ....

(Please no comment on the style of the code - I did not write it -
I only try to port it to OS/2)

--- Hans Michael "Maik" Stahl ------------------------
--- Berlin                                ___&___
--- Germany                               ||| |||
=== http://www.snafu.de/~hmstahl/ ==================--

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--- E3-32/1.11-32/2.51+