sysdeps/mach/hurd/socketpair.c

   1 /* Copyright (C) 1992-2015 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 Lesser General Public
   6    License as published by the Free Software Foundation; either
   7    version 2.1 of the 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    Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public
  15    License along with the GNU C Library; if not, see
  16    <http://www.gnu.org/licenses/>.  */
  17
  18 #include <errno.h>
  19 #include <fcntl.h>
  20 #include <sys/socket.h>
  21 #include <unistd.h>
  22
  23 #include <hurd.h>
  24 #include <hurd/fd.h>
  25 #include <hurd/socket.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 int
  32 __socketpair (int domain, int type, int protocol, int fds[2])
  33 {
  34   error_t err;
  35   socket_t server, sock1, sock2;
  36   int d1, d2;
  37
  38   if (fds == NULL)
  39     return __hurd_fail (EINVAL);
  40
  41   /* Find the domain's socket server.  */
  42   server = _hurd_socket_server (domain, 0);
  43   if (server == MACH_PORT_NULL)
  44     return -1;
  45
  46   /* Create two sockets and connect them together.  */
  47
  48   err = __socket_create (server, type, protocol, &sock1);
  49   if (err == MACH_SEND_INVALID_DEST || err == MIG_SERVER_DIED
  50       || err == MIG_BAD_ID || err == EOPNOTSUPP)
  51     {
  52       /* On the first use of the socket server during the operation,
  53          allow for the old server port dying.  */
  54       server = _hurd_socket_server (domain, 1);
  55       if (server == MACH_PORT_NULL)
  56         return -1;
  57       err = __socket_create (server, type, protocol, &sock1);
  58     }
  59   if (err)
  60     return __hurd_fail (err);
  61   if (err = __socket_create (server, type, protocol, &sock2))
  62     {
  63       __mach_port_deallocate (__mach_task_self (), sock1);
  64       return __hurd_fail (err);
  65     }
  66   if (err = __socket_connect2 (sock1, sock2))
  67     {
  68       __mach_port_deallocate (__mach_task_self (), sock1);
  69       __mach_port_deallocate (__mach_task_self (), sock2);
  70       return __hurd_fail (err);
  71     }
  72
  73   /* Put the sockets into file descriptors.  */
  74
  75   d1 = _hurd_intern_fd (sock1, O_IGNORE_CTTY, 1);
  76   if (d1 < 0)
  77     {
  78       __mach_port_deallocate (__mach_task_self (), sock2);
  79       return -1;
  80     }
  81   d2 = _hurd_intern_fd (sock2, O_IGNORE_CTTY, 1);
  82   if (d2 < 0)
  83     {
  84       err = errno;
  85       (void) close (d1);
  86       return __hurd_fail (err);
  87     }
  88
  89   fds[0] = d1;
  90   fds[1] = d2;
  91   return 0;
  92 }
  93
  94 weak_alias (__socketpair, socketpair)