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+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* ***** BEGIN LICENSE BLOCK *****
+ * Version: MPL 1.1/GPL 2.0/LGPL 2.1
+ *
+ * The contents of this file are subject to the Mozilla Public License Version
+ * 1.1 (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ * http://www.mozilla.org/MPL/
+ *
+ * Software distributed under the License is distributed on an "AS IS" basis,
+ * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
+ * for the specific language governing rights and limitations under the
+ * License.
+ *
+ * The Original Code is the Netscape Portable Runtime (NSPR).
+ *
+ * The Initial Developer of the Original Code is
+ * Netscape Communications Corporation.
+ * Portions created by the Initial Developer are Copyright (C) 1999-2000
+ * the Initial Developer. All Rights Reserved.
+ *
+ * Contributor(s):
+ *
+ * Alternatively, the contents of this file may be used under the terms of
+ * either the GNU General Public License Version 2 or later (the "GPL"), or
+ * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
+ * in which case the provisions of the GPL or the LGPL are applicable instead
+ * of those above. If you wish to allow use of your version of this file only
+ * under the terms of either the GPL or the LGPL, and not to allow others to
+ * use your version of this file under the terms of the MPL, indicate your
+ * decision by deleting the provisions above and replace them with the notice
+ * and other provisions required by the GPL or the LGPL. If you do not delete
+ * the provisions above, a recipient may use your version of this file under
+ * the terms of any one of the MPL, the GPL or the LGPL.
+ *
+ * ***** END LICENSE BLOCK ***** */
+
+/*
+** prshm.h -- NSPR Shared Memory
+**
+** NSPR Named Shared Memory API provides a cross-platform named
+** shared-memory interface. NSPR Named Shared Memory is modeled on
+** similar constructs in Unix and Windows operating systems. Shared
+** memory allows multiple processes to access one or more common shared
+** memory regions, using it as an inter-process communication channel.
+**
+** Notes on Platform Independence:
+**   NSPR Named Shared Memory is built on the native services offered
+**   by most platforms. The NSPR Named Shared Memory API tries to
+**   provide a least common denominator interface so that it works
+**   across all supported platforms. To ensure that it works everywhere,
+**   some platform considerations must be accomodated and the protocol
+**   for using NSPR Shared Memory API must be observed.
+**
+** Protocol:
+**   Multiple shared memories can be created using NSPR's Shared Memory
+**   feature. For each named shared memory, as defined by the name
+**   given in the PR_OpenSharedMemory() call, a protocol for using the
+**   shared memory API is required to ensure desired behavior. Failing
+**   to follow the protocol may yield unpredictable results.
+**   
+**   PR_OpenSharedMemory() will create the shared memory segment, if it
+**   does not already exist, or open a connection that the existing
+**   shared memory segment if it already exists.
+**   
+**   PR_AttachSharedMemory() should be called following
+**   PR_OpenSharedMemory() to map the memory segment to an address in
+**   the application's address space.
+**   
+**   PR_AttachSharedMemory() may be called to re-map a shared memory
+**   segment after detaching the same PRSharedMemory object. Be
+**   sure to detach it when done.
+**   
+**   PR_DetachSharedMemory() should be called to un-map the shared
+**   memory segment from the application's address space.
+**   
+**   PR_CloseSharedMemory() should be called when no further use of the
+**   PRSharedMemory object is required within a process. Following a
+**   call to  PR_CloseSharedMemory() the PRSharedMemory object is
+**   invalid and cannot be reused.
+**   
+**   PR_DeleteSharedMemory() should be called before process
+**   termination. After calling PR_DeleteSharedMemory() any further use
+**   of the shared memory associated with the name may cause
+**   unpredictable results.
+**   
+** Files:
+**   The name passed to PR_OpenSharedMemory() should be a valid filename
+**   for a unix platform. PR_OpenSharedMemory() creates file using the
+**   name passed in. Some platforms may mangle the name before creating
+**   the file and the shared memory.
+**   
+**   The unix implementation may use SysV IPC shared memory, Posix
+**   shared memory, or memory mapped files; the filename may used to
+**   define the namespace. On Windows, the name is significant, but
+**   there is no file associated with name.
+**   
+**   No assumptions about the persistence of data in the named file
+**   should be made. Depending on platform, the shared memory may be
+**   mapped onto system paging space and be discarded at process
+**   termination.
+**   
+**   All names provided to PR_OpenSharedMemory() should be valid
+**   filename syntax or name syntax for shared memory for the target
+**   platform. Referenced directories should have permissions 
+**   appropriate for writing.
+**
+** Limits:
+**   Different platforms have limits on both the number and size of
+**   shared memory resources. The default system limits on some
+**   platforms may be smaller than your requirements. These limits may
+**   be adjusted on some platforms either via boot-time options or by
+**   setting the size of the system paging space to accomodate more
+**   and/or larger shared memory segment(s).
+**
+** Security:
+**   On unix platforms, depending on implementation, contents of the
+**   backing store for the shared memory can be exposed via the file
+**   system. Set permissions and or access controls at create and attach
+**   time to ensure you get the desired security.
+**
+**   On windows platforms, no special security measures are provided.
+**
+** Example:
+**   The test case pr/tests/nameshm1.c provides an example of use as
+**   well as testing the operation of NSPR's Named Shared Memory.
+**
+** lth. 18-Aug-1999.
+*/
+
+#ifndef prshm_h___
+#define prshm_h___
+
+#include "prtypes.h"
+#include "prio.h"
+
+PR_BEGIN_EXTERN_C
+
+/*
+** Declare opaque type PRSharedMemory.
+*/
+typedef struct PRSharedMemory PRSharedMemory;
+
+/*
+** FUNCTION: PR_OpenSharedMemory()
+**
+** DESCRIPTION:
+**   PR_OpenSharedMemory() creates a new shared-memory segment or
+**   associates a previously created memory segment with name.
+**
+**   When parameter create is (PR_SHM_EXCL | PR_SHM_CREATE) and the
+**   shared memory already exists, the function returns NULL with the
+**   error set to PR_FILE_EXISTS_ERROR.
+**
+**   When parameter create is PR_SHM_CREATE and the shared memory
+**   already exists, a handle to that memory segment is returned. If
+**   the segment does not exist, it is created and a pointer to the
+**   related PRSharedMemory structure is returned.
+**
+**   When parameter create is 0, and the shared memory exists, a
+**   pointer to a PRSharedMemory is returned. If the shared memory does
+**   not exist, NULL is returned with the error set to
+**   PR_FILE_NOT_FOUND_ERROR.
+**
+** INPUTS:
+**   name -- the name the shared-memory segment is known as.
+**   size -- the size of the shared memory segment. 
+**   flags -- Options for creating the shared memory
+**   mode -- Same as is passed to PR_Open()
+**
+** OUTPUTS: 
+**   The shared memory is allocated.
+**
+** RETURNS: Pointer to opaque structure PRSharedMemory or NULL.
+**   NULL is returned on error. The reason for the error can be
+**   retrieved via PR_GetError() and PR_GetOSError();
+**
+*/
+NSPR_API( PRSharedMemory * )
+    PR_OpenSharedMemory(
+        const char *name,
+        PRSize      size,
+        PRIntn      flags,
+        PRIntn      mode
+);
+/* Define values for PR_OpenShareMemory(...,create) */
+#define PR_SHM_CREATE 0x1  /* create if not exist */
+#define PR_SHM_EXCL   0x2  /* fail if already exists */
+
+/*
+** FUNCTION: PR_AttachSharedMemory()
+**
+** DESCRIPTION:
+** PR_AttachSharedMemory() maps the shared-memory described by
+** shm to the current process. 
+**
+** INPUTS: 
+**   shm -- The handle returned from PR_OpenSharedMemory().
+**   flags -- options for mapping the shared memory.
+**   PR_SHM_READONLY causes the memory to be attached 
+**   read-only.
+**
+** OUTPUTS:
+**   On success, the shared memory segment represented by shm is mapped
+**   into the process' address space.
+**
+** RETURNS: Address where shared memory is mapped, or NULL.
+**   NULL is returned on error. The reason for the error can be
+**   retrieved via PR_GetError() and PR_GetOSError();
+**
+**
+*/
+NSPR_API( void * )
+    PR_AttachSharedMemory(
+        PRSharedMemory *shm,
+        PRIntn  flags
+);
+/* Define values for PR_AttachSharedMemory(...,flags) */ 
+#define PR_SHM_READONLY 0x01
+
+/*
+** FUNCTION: PR_DetachSharedMemory()
+**
+** DESCRIPTION:
+**   PR_DetachSharedMemory() detaches the shared-memory described
+**   by shm. 
+**
+** INPUTS: 
+**   shm -- The handle returned from PR_OpenSharedMemory().
+**   addr -- The address at which the memory was attached.
+**
+** OUTPUTS:
+**   The shared memory mapped to an address via a previous call to
+**   PR_AttachSharedMemory() is unmapped.
+**
+** RETURNS: PRStatus
+**
+*/
+NSPR_API( PRStatus )
+    PR_DetachSharedMemory(
+        PRSharedMemory *shm,
+        void  *addr
+);
+
+/*
+** FUNCTION: PR_CloseSharedMemory()
+**
+** DESCRIPTION:
+**   PR_CloseSharedMemory() closes the shared-memory described by
+**   shm.
+** 
+** INPUTS:
+**   shm -- The handle returned from PR_OpenSharedMemory().
+**
+** OUTPUTS:
+**   the shared memory represented by shm is closed
+**
+** RETURNS: PRStatus
+**
+*/
+NSPR_API( PRStatus )
+    PR_CloseSharedMemory(
+        PRSharedMemory *shm
+);
+
+/*
+** FUNCTION: PR_DeleteSharedMemory()
+**
+** DESCRIPTION:
+**   The shared memory resource represented by name is released.
+**
+** INPUTS:
+**   name -- the name the shared-memory segment
+**
+** OUTPUTS:
+**   depending on platform, resources may be returned to the underlying
+**   operating system.
+**
+** RETURNS: PRStatus
+**
+*/
+NSPR_API( PRStatus )
+    PR_DeleteSharedMemory( 
+        const char *name
+);
+
+PR_END_EXTERN_C
+
+#endif /* prshm_h___ */