sysdeps/mach/hurd/recvfrom.c

   1 /* Copyright (C) 1994-2014 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 <string.h>
  20 #include <sys/socket.h>
  21 #include <hurd.h>
  22 #include <hurd/fd.h>
  23 #include <hurd/socket.h>
  24
  25 /* Read N bytes into BUF through socket FD.
  26    If ADDR is not NULL, fill in *ADDR_LEN bytes of it with tha address of
  27    the sender, and store the actual size of the address in *ADDR_LEN.
  28    Returns the number of bytes read or -1 for errors.  */
  29 ssize_t
  30 __recvfrom (fd, buf, n, flags, addrarg, addr_len)
  31      int fd;
  32      void *buf;
  33      size_t n;
  34      int flags;
  35      __SOCKADDR_ARG addrarg;
  36      socklen_t *addr_len;
  37 {
  38   error_t err;
  39   mach_port_t addrport;
  40   char *bufp = buf;
  41   mach_msg_type_number_t nread = n;
  42   mach_port_t *ports;
  43   mach_msg_type_number_t nports = 0;
  44   char *cdata = NULL;
  45   mach_msg_type_number_t clen = 0;
  46   struct sockaddr *addr = addrarg.__sockaddr__;
  47
  48   if (err = HURD_DPORT_USE (fd, __socket_recv (port, &addrport,
  49                                                flags, &bufp, &nread,
  50                                                &ports, &nports,
  51                                                &cdata, &clen,
  52                                                &flags,
  53                                                n)))
  54     return __hurd_sockfail (fd, flags, err);
  55
  56   /* Get address data for the returned address port if requested.  */
  57   if (addr != NULL && addrport != MACH_PORT_NULL)
  58     {
  59       char *buf = (char *) addr;
  60       mach_msg_type_number_t buflen = *addr_len;
  61       int type;
  62
  63       err = __socket_whatis_address (addrport, &type, &buf, &buflen);
  64       if (err == EOPNOTSUPP)
  65         /* If the protocol server can't tell us the address, just return a
  66            zero-length one.  */
  67         {
  68           buf = (char *)addr;
  69           buflen = 0;
  70           err = 0;
  71         }
  72
  73       if (err)
  74         {
  75           __mach_port_deallocate (__mach_task_self (), addrport);
  76           return __hurd_sockfail (fd, flags, err);
  77         }
  78
  79       if (*addr_len > buflen)
  80         *addr_len = buflen;
  81
  82       if (buf != (char *) addr)
  83         {
  84           memcpy (addr, buf, *addr_len);
  85           __vm_deallocate (__mach_task_self (), (vm_address_t) buf, buflen);
  86         }
  87
  88       if (buflen > 0)
  89         addr->sa_family = type;
  90     }
  91   else if (addr_len != NULL)
  92     *addr_len = 0;
  93
  94   __mach_port_deallocate (__mach_task_self (), addrport);
  95
  96   /* Toss control data; we don't care.  */
  97   __vm_deallocate (__mach_task_self (), (vm_address_t) cdata, clen);
  98
  99   if (bufp != buf)
 100     {
 101       memcpy (buf, bufp, nread);
 102       __vm_deallocate (__mach_task_self (), (vm_address_t) bufp, nread);
 103     }
 104
 105   return nread;
 106 }
 107
 108 weak_alias (__recvfrom, recvfrom)