newlib-cygwin/winsup/cygwin/msg.cc

/* msg.cc: XSI IPC interface for Cygwin.

   Copyright 2002, 2003, 2004, 2005, 2008, 2009, 2014, 2015 Red Hat, Inc.

This file is part of Cygwin.

This software is a copyrighted work licensed under the terms of the
Cygwin license.  Please consult the file "CYGWIN_LICENSE" for
details. */

#include "winsup.h"
#include <unistd.h>

#include "sigproc.h"
#include "cygtls.h"

#include "cygserver_msg.h"

/*
 * client_request_msg Constructors
 */

client_request_msg::client_request_msg (int msqid,
					int cmd,
					struct msqid_ds *buf)
  : client_request (CYGSERVER_REQUEST_MSG, &_parameters, sizeof (_parameters))
{
  _parameters.in.msgop = MSGOP_msgctl;
  ipc_set_proc_info (_parameters.in.ipcblk);

   _parameters.in.ctlargs.msqid = msqid;
   _parameters.in.ctlargs.cmd = cmd;
   _parameters.in.ctlargs.buf = buf;

  msglen (sizeof (_parameters.in));
}

client_request_msg::client_request_msg (key_t key,
					int msgflg)
  : client_request (CYGSERVER_REQUEST_MSG, &_parameters, sizeof (_parameters))
{
  _parameters.in.msgop = MSGOP_msgget;
  ipc_set_proc_info (_parameters.in.ipcblk);

  _parameters.in.getargs.key = key;
  _parameters.in.getargs.msgflg = msgflg;

  msglen (sizeof (_parameters.in));
}

client_request_msg::client_request_msg (int msqid,
					void *msgp,
					size_t msgsz,
					long msgtyp,
					int msgflg)
  : client_request (CYGSERVER_REQUEST_MSG, &_parameters, sizeof (_parameters))
{
  _parameters.in.msgop = MSGOP_msgrcv;
  ipc_set_proc_info (_parameters.in.ipcblk);

  _parameters.in.rcvargs.msqid = msqid;
  _parameters.in.rcvargs.msgp = msgp;
  _parameters.in.rcvargs.msgsz = msgsz;
  _parameters.in.rcvargs.msgtyp = msgtyp;
  _parameters.in.rcvargs.msgflg = msgflg;

  msglen (sizeof (_parameters.in));
}

client_request_msg::client_request_msg (int msqid,
					const void *msgp,
					size_t msgsz,
					int msgflg)
  : client_request (CYGSERVER_REQUEST_MSG, &_parameters, sizeof (_parameters))
{
  _parameters.in.msgop = MSGOP_msgsnd;
  ipc_set_proc_info (_parameters.in.ipcblk);

  _parameters.in.sndargs.msqid = msqid;
  _parameters.in.sndargs.msgp = msgp;
  _parameters.in.sndargs.msgsz = msgsz;
  _parameters.in.sndargs.msgflg = msgflg;

  msglen (sizeof (_parameters.in));
}

/*
 * XSI message queue API.  These are exported by the DLL.
 */

extern "C" int
msgctl (int msqid, int cmd, struct msqid_ds *buf)
{
  syscall_printf ("msgctl (msqid = %d, cmd = %y, buf = %p)", msqid, cmd, buf);
  __try
    {
      switch (cmd)
	{
	  case IPC_STAT:
	    break;
	  case IPC_SET:
	    break;
	  case IPC_RMID:
	    break;
	  case IPC_INFO:
	    break;
	  case MSG_INFO:
	    break;
	  default:
	    syscall_printf ("-1 [%d] = msgctl ()", EINVAL);
	    set_errno (EINVAL);
	    __leave;
	}
      client_request_msg request (msqid, cmd, buf);
      if (request.make_request () == -1 || request.retval () == -1)
	{
	  syscall_printf ("-1 [%d] = msgctl ()", request.error_code ());
	  set_errno (request.error_code ());
	  __leave;
	}
      return request.retval ();
    }
  __except (EFAULT) {}
  __endtry
  return -1;
}

extern "C" int
msgget (key_t key, int msgflg)
{
  syscall_printf ("msgget (key = %U, msgflg = %y)", key, msgflg);
  client_request_msg request (key, msgflg);
  if (request.make_request () == -1 || request.retval () == -1)
    {
      syscall_printf ("-1 [%d] = msgget ()", request.error_code ());
      set_errno (request.error_code ());
      return -1;
    }
  return request.retval ();
}

extern "C" ssize_t
msgrcv (int msqid, void *msgp, size_t msgsz, long msgtyp, int msgflg)
{
  syscall_printf ("msgrcv (msqid = %d, msgp = %p, msgsz = %ld, "
		  "msgtyp = %d, msgflg = %y)",
		  msqid, msgp, msgsz, msgtyp, msgflg);
  __try
    {
      client_request_msg request (msqid, msgp, msgsz, msgtyp, msgflg);
      if (request.make_request () == -1 || request.rcvval () == -1)
	{
	  syscall_printf ("-1 [%d] = msgrcv ()", request.error_code ());
	  set_errno (request.error_code ());
	  __leave;
	}
      return request.rcvval ();
    }
  __except (EFAULT) {}
  __endtry
  return -1;
}

extern "C" int
msgsnd (int msqid, const void *msgp, size_t msgsz, int msgflg)
{
  syscall_printf ("msgsnd (msqid = %d, msgp = %p, msgsz = %ld, msgflg = %y)",
		  msqid, msgp, msgsz, msgflg);
  __try
    {
      client_request_msg request (msqid, msgp, msgsz, msgflg);
      if (request.make_request () == -1 || request.retval () == -1)
	{
	  syscall_printf ("-1 [%d] = msgsnd ()", request.error_code ());
	  set_errno (request.error_code ());
	  __leave;
	}
      return request.retval ();
    }
  __except (EFAULT) {}
  __endtry
  return -1;
}