* sysdeps/mach/hurd/recvmsg.c: New file. * sysdeps/mach/hurd/sendmsg.c: New file.

2001-07-29  Mark Kettenis  <kettenis@gnu.org>

	* sysdeps/mach/hurd/recvmsg.c: New file.
	* sysdeps/mach/hurd/sendmsg.c: New file.

1 files changed, 144 insertions, 0 deletions

diff --git a/sysdeps/mach/hurd/recvmsg.c b/sysdeps/mach/hurd/recvmsg.c
new file mode 100644
index 0000000000..73cd03c6d4
--- /dev/null
+++ b/sysdeps/mach/hurd/recvmsg.c
@@ -0,0 +1,144 @@
+/* Copyright (C) 2001 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Library General Public License as
+   published by the Free Software Foundation; either version 2 of the
+   License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Library General Public License for more details.
+
+   You should have received a copy of the GNU Library General Public
+   License along with the GNU C Library; see the file COPYING.LIB.  If not,
+   write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+   Boston, MA 02111-1307, USA.  */
+
+#include <errno.h>
+#include <string.h>
+#include <sys/socket.h>
+
+#include <hurd.h>
+#include <hurd/fd.h>
+#include <hurd/socket.h>
+
+/* Receive a message as described by MESSAGE from socket FD.
+   Returns the number of bytes read or -1 for errors.  */
+ssize_t
+__libc_recvmsg (int fd, struct msghdr *message, int flags)
+{
+  error_t err;
+  addr_port_t aport;
+  char *data = NULL;
+  mach_msg_type_number_t len = 0;
+  mach_port_t *ports;
+  mach_msg_type_number_t nports;
+  char *cdata = NULL;
+  mach_msg_type_number_t clen = 0;
+  size_t amount;
+  char *buf;
+  int i;
+
+  /* Find the total number of bytes to be read.  */
+  amount = 0;
+  for (i = 0; i < message->msg_iovlen; i++)
+    {
+      amount += message->msg_iov[i].iov_len;
+
+      /* As an optimization, we set the initial values of DATA and LEN
+         from the first non-empty iovec.  This kicks-in in the case
+         where the whole packet fits into that iovec buffer.  */
+      if (data == NULL && message->msg_iov[i].iov_len > 0)
+	{
+	  data = message->msg_iov[i].iov_base;
+	  len = message->msg_iov[i].iov_len;
+	}
+    }
+
+  buf = data;
+  if (err = HURD_DPORT_USE (fd, __socket_recv (port, &aport,
+					       flags, &data, &len,
+					       &ports, &nports,
+					       &cdata, &clen,
+					       &message->msg_flags, amount)))
+    return __hurd_dfail (fd, err);
+
+  if (message->msg_name != NULL)
+    {
+      char *buf = message->msg_name;
+      mach_msg_type_number_t buflen = message->msg_namelen;
+      int type;
+
+      err = __socket_whatis_address (aport, &type, &buf, &buflen);
+      if (err == EOPNOTSUPP)
+	/* If the protocol server can't tell us the address, just return a
+	   zero-length one.  */
+	{
+	  buf = message->msg_name;
+	  buflen = 0;
+	  err = 0;
+	}
+
+      if (err)
+	{
+	  __mach_port_deallocate (__mach_task_self (), aport);
+	  return __hurd_dfail (fd, err);
+	}
+
+      if (message->msg_namelen > buflen)
+	message->msg_namelen = buflen;
+
+      if (buf != message->msg_name)
+	{
+	  memcpy (message->msg_name, buf, message->msg_namelen);
+	  __vm_deallocate (__mach_task_self (), (vm_address_t) buf, buflen);
+	}
+
+      if (buflen > 0)
+	((struct sockaddr *) message->msg_name)->sa_family = type;
+    }
+
+  __mach_port_deallocate (__mach_task_self (), aport);
+
+  if (buf == data)
+    buf += len;
+  else
+    {
+      /* Copy the data into MSG.  */
+      if (len > amount)
+	message->msg_flags |= MSG_TRUNC;
+      else
+	amount = len;
+
+      buf = data;
+      for (i = 0; i < message->msg_iovlen; i++)
+	{
+#define min(a, b)	((a) > (b) ? (b) : (a))
+	  size_t copy = min (message->msg_iov[i].iov_len, amount);
+
+	  memcpy (message->msg_iov[i].iov_base, buf, copy);
+
+	  buf += copy;
+	  amount -= copy;
+	  if (len == 0)
+	    break;
+	}
+
+      __vm_deallocate (__mach_task_self (), (vm_address_t) data, len);
+    }
+
+  /* Copy the control message into MSG.  */
+  if (clen > message->msg_controllen)
+    message->msg_flags |= MSG_CTRUNC;
+  else
+    message->msg_controllen = clen;
+  memcpy (message->msg_control, cdata, message->msg_controllen);
+
+  __vm_deallocate (__mach_task_self (), (vm_address_t) cdata, clen);
+
+  return (buf - data);
+}
+
+weak_alias (__libc_recvmsg, recvmsg)