sysdeps/mach/hurd/socketpair.c

   1 /* Copyright (C) 1992, 94, 95, 96, 97, 2000 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, write to the Free
  16    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  17    02111-1307 USA.  */
  18
  19 #include <errno.h>
  20 #include <fcntl.h>
  21 #include <sys/socket.h>
  22 #include <unistd.h>
  23
  24 #include <hurd.h>
  25 #include <hurd/fd.h>
  26 #include <hurd/socket.h>
  27
  28 /* Create two new sockets, of type TYPE in domain DOMAIN and using
  29    protocol PROTOCOL, which are connected to each other, and put file
  30    descriptors for them in FDS[0] and FDS[1].  If PROTOCOL is zero,
  31    one will be chosen automatically.  Returns 0 on success, -1 for errors.  */
  32 int
  33 __socketpair (int domain, int type, int protocol, int fds[2])
  34 {
  35   error_t err;
  36   socket_t server, sock1, sock2;
  37   int d1, d2;
  38
  39   if (fds == NULL)
  40     return __hurd_fail (EINVAL);
  41
  42   /* Find the domain's socket server.  */
  43   server = _hurd_socket_server (domain, 0);
  44   if (server == MACH_PORT_NULL)
  45     return -1;
  46
  47   /* Create two sockets and connect them together.  */
  48
  49   err = __socket_create (server, type, protocol, &sock1);
  50   if (err == MACH_SEND_INVALID_DEST || err == MIG_SERVER_DIED
  51       || err == MIG_BAD_ID || err == EOPNOTSUPP)
  52     {
  53       /* On the first use of the socket server during the operation,
  54          allow for the old server port dying.  */
  55       server = _hurd_socket_server (domain, 1);
  56       if (server == MACH_PORT_NULL)
  57         return -1;
  58       err = __socket_create (server, type, protocol, &sock1);
  59     }
  60   if (err)
  61     return __hurd_fail (err);
  62   if (err = __socket_create (server, type, protocol, &sock2))
  63     {
  64       __mach_port_deallocate (__mach_task_self (), sock1);
  65       return __hurd_fail (err);
  66     }
  67   if (err = __socket_connect2 (sock1, sock2))
  68     {
  69       __mach_port_deallocate (__mach_task_self (), sock1);
  70       __mach_port_deallocate (__mach_task_self (), sock2);
  71       return __hurd_fail (err);
  72     }
  73
  74   /* Put the sockets into file descriptors.  */
  75
  76   d1 = _hurd_intern_fd (sock1, O_IGNORE_CTTY, 1);
  77   if (d1 < 0)
  78     {
  79       __mach_port_deallocate (__mach_task_self (), sock2);
  80       return -1;
  81     }
  82   d2 = _hurd_intern_fd (sock2, O_IGNORE_CTTY, 1);
  83   if (d2 < 0)
  84     {
  85       err = errno;
  86       (void) close (d1);
  87       return __hurd_fail (err);
  88     }
  89
  90   fds[0] = d1;
  91   fds[1] = d2;
  92   return 0;
  93 }
  94
  95 weak_alias (__socketpair, socketpair)