1  /* Copyright (C) 1994-2023 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     <https://www.gnu.org/licenses/>.  */
      17  
      18  #include <errno.h>
      19  #include <sys/socket.h>
      20  #include <hurd.h>
      21  #include <hurd/fd.h>
      22  #include <hurd/socket.h>
      23  #include <string.h>
      24  #include <sysdep-cancel.h>
      25  
      26  /* Read N bytes into BUF from socket FD.
      27     Returns the number read or -1 for errors.  */
      28  
      29  ssize_t
      30  __recv (int fd, void *buf, size_t n, int flags)
      31  {
      32    error_t err;
      33    mach_port_t addrport;
      34    char *bufp = buf;
      35    mach_msg_type_number_t nread = n;
      36    mach_port_t *ports;
      37    mach_msg_type_number_t nports = 0;
      38    char *cdata = NULL;
      39    mach_msg_type_number_t clen = 0;
      40    int cancel_oldtype;
      41  
      42    cancel_oldtype = LIBC_CANCEL_ASYNC();
      43    err = HURD_DPORT_USE_CANCEL (fd, __socket_recv (port, &addrport,
      44  						  flags, &bufp, &nread,
      45  						  &ports, &nports,
      46  						  &cdata, &clen,
      47  						  &flags,
      48  						  n));
      49    LIBC_CANCEL_RESET (cancel_oldtype);
      50  
      51    if (err == MIG_BAD_ID || err == EOPNOTSUPP)
      52      /* The file did not grok the socket protocol.  */
      53      err = ENOTSOCK;
      54    if (err)
      55      return __hurd_sockfail (fd, flags, err);
      56  
      57    if (MACH_PORT_VALID (addrport))
      58      __mach_port_deallocate (__mach_task_self (), addrport);
      59    __vm_deallocate (__mach_task_self (), (vm_address_t) cdata, clen);
      60  
      61    if (bufp != buf)
      62      {
      63        memcpy (buf, bufp, nread);
      64        __vm_deallocate (__mach_task_self (), (vm_address_t) bufp, nread);
      65      }
      66  
      67    return nread;
      68  }
      69  libc_hidden_def (__recv)
      70  weak_alias (__recv, recv)