sysdeps/mach/hurd/socketpair.c

   1 /* Copyright (C) 1992, 1994, 1995, 1996, 1997 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3
   4    The GNU C Library is free software; you can redistribute it and/or
   5    modify it under the terms of the GNU Library General Public License as
   6    published by the Free Software Foundation; either version 2 of the
   7    License, or (at your option) any later version.
   8
   9    The GNU C Library is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12    Library General Public License for more details.
  13
  14    You should have received a copy of the GNU Library General Public
  15    License along with the GNU C Library; see the file COPYING.LIB.  If not,
  16    write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  17    Boston, MA 02111-1307, USA.  */
  18
  19 #include <errno.h>
  20 #include <sys/socket.h>
  21 #include <hurd.h>
  22 #include <hurd/socket.h>
  23 #include <hurd/fd.h>
  24 #include <unistd.h>
  25 #include <fcntl.h>
  26
  27 /* Create two new sockets, of type TYPE in domain DOMAIN and using
  28    protocol PROTOCOL, which are connected to each other, and put file
  29    descriptors for them in FDS[0] and FDS[1].  If PROTOCOL is zero,
  30    one will be chosen automatically.  Returns 0 on success, -1 for errors.  */
  31 /* XXX should be __socketpair ? */
  32 int
  33 socketpair (domain, type, protocol, fds)
  34      int domain;
  35      int type;
  36      int protocol;
  37      int fds[2];
  38 {
  39   error_t err;
  40   socket_t server, sock1, sock2;
  41   int d1, d2;
  42
  43   if (fds == NULL)
  44     return __hurd_fail (EINVAL);
  45
  46   /* Find the domain's socket server.  */
  47   server = _hurd_socket_server (domain, 0);
  48   if (server == MACH_PORT_NULL)
  49     return -1;
  50
  51   /* Create two sockets and connect them together.  */
  52
  53   err = __socket_create (server, type, protocol, &sock1);
  54   if (err == MACH_SEND_INVALID_DEST || err == MIG_SERVER_DIED
  55       || err == MIG_BAD_ID || err == EOPNOTSUPP)
  56     {
  57       /* On the first use of the socket server during the operation,
  58          allow for the old server port dying.  */
  59       server = _hurd_socket_server (domain, 1);
  60       if (server == MACH_PORT_NULL)
  61         return -1;
  62       err = __socket_create (server, type, protocol, &sock1);
  63     }
  64   if (err)
  65     return __hurd_fail (err);
  66   if (err = __socket_create (server, type, protocol, &sock2))
  67     {
  68       __mach_port_deallocate (__mach_task_self (), sock1);
  69       return __hurd_fail (err);
  70     }
  71   if (err = __socket_connect2 (sock1, sock2))
  72     {
  73       __mach_port_deallocate (__mach_task_self (), sock1);
  74       __mach_port_deallocate (__mach_task_self (), sock2);
  75       return __hurd_fail (err);
  76     }
  77
  78   /* Put the sockets into file descriptors.  */
  79
  80   d1 = _hurd_intern_fd (sock1, O_IGNORE_CTTY, 1);
  81   if (d1 < 0)
  82     {
  83       __mach_port_deallocate (__mach_task_self (), sock2);
  84       return -1;
  85     }
  86   d2 = _hurd_intern_fd (sock2, O_IGNORE_CTTY, 1);
  87   if (d2 < 0)
  88     {
  89       err = errno;
  90       (void) close (d1);
  91       return __hurd_fail (err);
  92     }
  93
  94   fds[0] = d1;
  95   fds[1] = d2;
  96   return 0;
  97 }