sysdeps/mach/hurd/recvfrom.c

   1 /* Copyright (C) 1994, 1997, 1999, 2001, 2002 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 <string.h>
  21 #include <sys/socket.h>
  22 #include <hurd.h>
  23 #include <hurd/fd.h>
  24 #include <hurd/socket.h>
  25
  26 /* Read N bytes into BUF through socket FD.
  27    If ADDR is not NULL, fill in *ADDR_LEN bytes of it with tha address of
  28    the sender, and store the actual size of the address in *ADDR_LEN.
  29    Returns the number of bytes read or -1 for errors.  */
  30 ssize_t
  31 __recvfrom (fd, buf, n, flags, addrarg, addr_len)
  32      int fd;
  33      void *buf;
  34      size_t n;
  35      int flags;
  36      __SOCKADDR_ARG addrarg;
  37      socklen_t *addr_len;
  38 {
  39   error_t err;
  40   mach_port_t addrport;
  41   char *bufp = buf;
  42   mach_msg_type_number_t nread = n;
  43   mach_port_t *ports;
  44   mach_msg_type_number_t nports = 0;
  45   char *cdata = NULL;
  46   mach_msg_type_number_t clen = 0;
  47   struct sockaddr *addr = addrarg.__sockaddr__;
  48
  49   if (err = HURD_DPORT_USE (fd, __socket_recv (port, &addrport,
  50                                                flags, &bufp, &nread,
  51                                                &ports, &nports,
  52                                                &cdata, &clen,
  53                                                &flags,
  54                                                n)))
  55     return __hurd_sockfail (fd, flags, err);
  56
  57   /* Get address data for the returned address port if requested.  */
  58   if (addr != NULL)
  59     {
  60       char *buf = (char *) addr;
  61       mach_msg_type_number_t buflen = *addr_len;
  62       int type;
  63
  64       err = __socket_whatis_address (addrport, &type, &buf, &buflen);
  65       if (err == EOPNOTSUPP)
  66         /* If the protocol server can't tell us the address, just return a
  67            zero-length one.  */
  68         {
  69           buf = (char *)addr;
  70           buflen = 0;
  71           err = 0;
  72         }
  73
  74       if (err)
  75         {
  76           __mach_port_deallocate (__mach_task_self (), addrport);
  77           return __hurd_sockfail (fd, flags, err);
  78         }
  79
  80       if (*addr_len > buflen)
  81         *addr_len = buflen;
  82
  83       if (buf != (char *) addr)
  84         {
  85           memcpy (addr, buf, *addr_len);
  86           __vm_deallocate (__mach_task_self (), (vm_address_t) buf, buflen);
  87         }
  88
  89       if (buflen > 0)
  90         addr->sa_family = type;
  91     }
  92
  93   __mach_port_deallocate (__mach_task_self (), addrport);
  94
  95   /* Toss control data; we don't care.  */
  96   __vm_deallocate (__mach_task_self (), (vm_address_t) cdata, clen);
  97
  98   if (bufp != buf)
  99     {
 100       memcpy (buf, bufp, nread);
 101       __vm_deallocate (__mach_task_self (), (vm_address_t) bufp, nread);
 102     }
 103
 104   return nread;
 105 }
 106
 107 weak_alias (__recvfrom, recvfrom)