--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/nspr/pr/src/md/unix/uxshm.c	Mon Jul 28 10:47:06 2014 +0200
@@ -0,0 +1,643 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+/*
+** uxshm.c -- Unix Implementations NSPR Named Shared Memory
+**
+**
+** lth. Jul-1999.
+**
+*/
+#include <string.h>
+#include <prshm.h>
+#include <prerr.h>
+#include <prmem.h>
+#include "primpl.h"       
+#include <fcntl.h>
+
+extern PRLogModuleInfo *_pr_shm_lm;
+
+
+#define NSPR_IPC_SHM_KEY 'b'
+/*
+** Implementation for System V
+*/
+#if defined PR_HAVE_SYSV_NAMED_SHARED_MEMORY
+#include <sys/ipc.h>
+#include <sys/shm.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+
+#define _MD_OPEN_SHARED_MEMORY _MD_OpenSharedMemory
+#define _MD_ATTACH_SHARED_MEMORY _MD_AttachSharedMemory
+#define _MD_DETACH_SHARED_MEMORY _MD_DetachSharedMemory
+#define _MD_CLOSE_SHARED_MEMORY _MD_CloseSharedMemory
+#define _MD_DELETE_SHARED_MEMORY  _MD_DeleteSharedMemory
+
+extern PRSharedMemory * _MD_OpenSharedMemory( 
+    const char *name,
+    PRSize      size,
+    PRIntn      flags,
+    PRIntn      mode
+)
+{
+    PRStatus rc = PR_SUCCESS;
+    key_t   key;
+    PRSharedMemory *shm;
+    char        ipcname[PR_IPC_NAME_SIZE];
+
+    rc = _PR_MakeNativeIPCName( name, ipcname, PR_IPC_NAME_SIZE, _PRIPCShm );
+    if ( PR_FAILURE == rc )
+    {
+        _PR_MD_MAP_DEFAULT_ERROR( errno );
+        PR_LOG( _pr_shm_lm, PR_LOG_DEBUG, 
+            ("_MD_OpenSharedMemory(): _PR_MakeNativeIPCName() failed: %s", name ));
+        return( NULL );
+    }
+
+    shm = PR_NEWZAP( PRSharedMemory );
+    if ( NULL == shm ) 
+    {
+        PR_SetError(PR_OUT_OF_MEMORY_ERROR, 0 );
+        PR_LOG(_pr_shm_lm, PR_LOG_DEBUG, ( "PR_OpenSharedMemory: New PRSharedMemory out of memory")); 
+        return( NULL );
+    }
+
+    shm->ipcname = (char*)PR_MALLOC( strlen( ipcname ) + 1 );
+    if ( NULL == shm->ipcname )
+    {
+        PR_SetError(PR_OUT_OF_MEMORY_ERROR, 0 );
+        PR_LOG(_pr_shm_lm, PR_LOG_DEBUG, ( "PR_OpenSharedMemory: New shm->ipcname out of memory")); 
+        PR_DELETE( shm );
+        return( NULL );
+    }
+
+    /* copy args to struct */
+    strcpy( shm->ipcname, ipcname );
+    shm->size = size; 
+    shm->mode = mode; 
+    shm->flags = flags;
+    shm->ident = _PR_SHM_IDENT;
+
+    /* create the file first */
+    if ( flags & PR_SHM_CREATE )  {
+        int osfd = open( shm->ipcname, (O_RDWR | O_CREAT), shm->mode );
+        if ( -1 == osfd ) {
+            _PR_MD_MAP_OPEN_ERROR( errno );
+            PR_FREEIF( shm->ipcname );
+            PR_DELETE( shm );
+            return( NULL );
+        } 
+        if ( close(osfd) == -1 ) {
+            _PR_MD_MAP_CLOSE_ERROR( errno );
+            PR_FREEIF( shm->ipcname );
+            PR_DELETE( shm );
+            return( NULL );
+        }
+    }
+
+    /* hash the shm.name to an ID */
+    key = ftok( shm->ipcname, NSPR_IPC_SHM_KEY );
+    if ( -1 == key )
+    {
+        rc = PR_FAILURE;
+        _PR_MD_MAP_DEFAULT_ERROR( errno );
+        PR_LOG( _pr_shm_lm, PR_LOG_DEBUG, 
+            ("_MD_OpenSharedMemory(): ftok() failed on name: %s", shm->ipcname));
+        PR_FREEIF( shm->ipcname );
+        PR_DELETE( shm );
+        return( NULL );
+    }
+
+    /* get the shared memory */
+    if ( flags & PR_SHM_CREATE )  {
+        shm->id = shmget( key, shm->size, ( shm->mode | IPC_CREAT|IPC_EXCL));
+        if ( shm->id >= 0 ) {
+            return( shm );
+        }
+        if ((errno == EEXIST) && (flags & PR_SHM_EXCL)) {
+            PR_SetError( PR_FILE_EXISTS_ERROR, errno );
+            PR_LOG( _pr_shm_lm, PR_LOG_DEBUG, 
+                ("_MD_OpenSharedMemory(): shmget() exclusive failed, errno: %d", errno));
+            PR_FREEIF(shm->ipcname);
+            PR_DELETE(shm);
+            return(NULL);
+        }
+    } 
+
+    shm->id = shmget( key, shm->size, shm->mode );
+    if ( -1 == shm->id ) {
+        _PR_MD_MAP_DEFAULT_ERROR( errno );
+        PR_LOG( _pr_shm_lm, PR_LOG_DEBUG, 
+            ("_MD_OpenSharedMemory(): shmget() failed, errno: %d", errno));
+        PR_FREEIF(shm->ipcname);
+        PR_DELETE(shm);
+        return(NULL);
+    }
+
+    return( shm );
+} /* end _MD_OpenSharedMemory() */
+
+extern void * _MD_AttachSharedMemory( PRSharedMemory *shm, PRIntn flags )
+{
+    void        *addr;
+    PRUint32    aFlags = shm->mode;
+
+    PR_ASSERT( shm->ident == _PR_SHM_IDENT );
+
+    aFlags |= (flags & PR_SHM_READONLY )? SHM_RDONLY : 0;
+
+    addr = shmat( shm->id, NULL, aFlags );
+    if ( (void*)-1 == addr )
+    {
+        _PR_MD_MAP_DEFAULT_ERROR( errno );
+        PR_LOG( _pr_shm_lm, PR_LOG_DEBUG, 
+            ("_MD_AttachSharedMemory(): shmat() failed on name: %s, OsError: %d", 
+                shm->ipcname, PR_GetOSError() ));
+        addr = NULL;
+    }
+
+    return addr;
+}    
+
+extern PRStatus _MD_DetachSharedMemory( PRSharedMemory *shm, void *addr )
+{
+    PRStatus rc = PR_SUCCESS;
+    PRIntn   urc;
+
+    PR_ASSERT( shm->ident == _PR_SHM_IDENT );
+
+    urc = shmdt( addr );
+    if ( -1 == urc )
+    {
+        rc = PR_FAILURE;
+        _PR_MD_MAP_DEFAULT_ERROR( errno );
+        PR_LOG( _pr_shm_lm, PR_LOG_DEBUG, 
+            ("_MD_DetachSharedMemory(): shmdt() failed on name: %s", shm->ipcname ));
+    }
+
+    return rc;
+}    
+
+extern PRStatus _MD_CloseSharedMemory( PRSharedMemory *shm )
+{
+    PR_ASSERT( shm->ident == _PR_SHM_IDENT );
+
+    PR_FREEIF(shm->ipcname);
+    PR_DELETE(shm);
+
+    return PR_SUCCESS;
+}    
+
+extern PRStatus _MD_DeleteSharedMemory( const char *name )
+{
+    PRStatus rc = PR_SUCCESS;
+    key_t   key;
+    int     id;
+    PRIntn  urc;
+    char        ipcname[PR_IPC_NAME_SIZE];
+
+    rc = _PR_MakeNativeIPCName( name, ipcname, PR_IPC_NAME_SIZE, _PRIPCShm );
+    if ( PR_FAILURE == rc )
+    {
+        PR_SetError( PR_UNKNOWN_ERROR , errno );
+        PR_LOG( _pr_shm_lm, PR_LOG_DEBUG, 
+            ("_MD_DeleteSharedMemory(): _PR_MakeNativeIPCName() failed: %s", name ));
+        return(PR_FAILURE);
+    }
+
+    /* create the file first */ 
+    {
+        int osfd = open( ipcname, (O_RDWR | O_CREAT), 0666 );
+        if ( -1 == osfd ) {
+            _PR_MD_MAP_OPEN_ERROR( errno );
+            return( PR_FAILURE );
+        } 
+        if ( close(osfd) == -1 ) {
+            _PR_MD_MAP_CLOSE_ERROR( errno );
+            return( PR_FAILURE );
+        }
+    }
+
+    /* hash the shm.name to an ID */
+    key = ftok( ipcname, NSPR_IPC_SHM_KEY );
+    if ( -1 == key )
+    {
+        rc = PR_FAILURE;
+        _PR_MD_MAP_DEFAULT_ERROR( errno );
+        PR_LOG( _pr_shm_lm, PR_LOG_DEBUG, 
+            ("_MD_DeleteSharedMemory(): ftok() failed on name: %s", ipcname));
+    }
+
+#ifdef SYMBIAN
+    /* In Symbian OS the system imposed minimum is 1 byte, instead of ZERO */
+    id = shmget( key, 1, 0 );
+#else
+    id = shmget( key, 0, 0 );
+#endif
+    if ( -1 == id ) {
+        _PR_MD_MAP_DEFAULT_ERROR( errno );
+        PR_LOG( _pr_shm_lm, PR_LOG_DEBUG, 
+            ("_MD_DeleteSharedMemory(): shmget() failed, errno: %d", errno));
+        return(PR_FAILURE);
+    }
+
+    urc = shmctl( id, IPC_RMID, NULL );
+    if ( -1 == urc )
+    {
+        _PR_MD_MAP_DEFAULT_ERROR( errno );
+        PR_LOG( _pr_shm_lm, PR_LOG_DEBUG, 
+            ("_MD_DeleteSharedMemory(): shmctl() failed on name: %s", ipcname ));
+        return(PR_FAILURE);
+    }
+
+    urc = unlink( ipcname );
+    if ( -1 == urc ) {
+        _PR_MD_MAP_UNLINK_ERROR( errno );
+        PR_LOG( _pr_shm_lm, PR_LOG_DEBUG, 
+            ("_MD_DeleteSharedMemory(): unlink() failed: %s", ipcname ));
+        return(PR_FAILURE);
+    }
+
+    return rc;
+}  /* end _MD_DeleteSharedMemory() */
+
+/*
+** Implementation for Posix
+*/
+#elif defined PR_HAVE_POSIX_NAMED_SHARED_MEMORY
+#include <sys/mman.h>
+
+#define _MD_OPEN_SHARED_MEMORY _MD_OpenSharedMemory
+#define _MD_ATTACH_SHARED_MEMORY _MD_AttachSharedMemory
+#define _MD_DETACH_SHARED_MEMORY _MD_DetachSharedMemory
+#define _MD_CLOSE_SHARED_MEMORY _MD_CloseSharedMemory
+#define _MD_DELETE_SHARED_MEMORY  _MD_DeleteSharedMemory
+
+struct _MDSharedMemory {
+    int     handle;
+};
+
+extern PRSharedMemory * _MD_OpenSharedMemory( 
+    const char *name,
+    PRSize      size,
+    PRIntn      flags,
+    PRIntn      mode
+)
+{
+    PRStatus    rc = PR_SUCCESS;
+    PRInt32     end;
+    PRSharedMemory *shm;
+    char        ipcname[PR_IPC_NAME_SIZE];
+
+    rc = _PR_MakeNativeIPCName( name, ipcname, PR_IPC_NAME_SIZE, _PRIPCShm );
+    if ( PR_FAILURE == rc )
+    {
+        PR_SetError( PR_UNKNOWN_ERROR , errno );
+        PR_LOG( _pr_shm_lm, PR_LOG_DEBUG, 
+            ("_MD_OpenSharedMemory(): _PR_MakeNativeIPCName() failed: %s", name ));
+        return( NULL );
+    }
+
+    shm = PR_NEWZAP( PRSharedMemory );
+    if ( NULL == shm ) 
+    {
+        PR_SetError(PR_OUT_OF_MEMORY_ERROR, 0 );
+        PR_LOG(_pr_shm_lm, PR_LOG_DEBUG, ( "PR_OpenSharedMemory: New PRSharedMemory out of memory")); 
+        return( NULL );
+    }
+
+    shm->ipcname = PR_MALLOC( strlen( ipcname ) + 1 );
+    if ( NULL == shm->ipcname )
+    {
+        PR_SetError(PR_OUT_OF_MEMORY_ERROR, 0 );
+        PR_LOG(_pr_shm_lm, PR_LOG_DEBUG, ( "PR_OpenSharedMemory: New shm->ipcname out of memory")); 
+        return( NULL );
+    }
+
+    /* copy args to struct */
+    strcpy( shm->ipcname, ipcname );
+    shm->size = size; 
+    shm->mode = mode;
+    shm->flags = flags;
+    shm->ident = _PR_SHM_IDENT;
+
+    /*
+    ** Create the shared memory
+    */
+    if ( flags & PR_SHM_CREATE )  {
+        int oflag = (O_CREAT | O_RDWR);
+        
+        if ( flags & PR_SHM_EXCL )
+            oflag |= O_EXCL;
+        shm->id = shm_open( shm->ipcname, oflag, shm->mode );
+    } else {
+        shm->id = shm_open( shm->ipcname, O_RDWR, shm->mode );
+    }
+
+    if ( -1 == shm->id )  {
+        _PR_MD_MAP_DEFAULT_ERROR( errno );
+        PR_LOG(_pr_shm_lm, PR_LOG_DEBUG, 
+            ("_MD_OpenSharedMemory(): shm_open failed: %s, OSError: %d",
+                shm->ipcname, PR_GetOSError())); 
+        PR_DELETE( shm->ipcname );
+        PR_DELETE( shm );
+        return(NULL);
+    }
+
+    end = ftruncate( shm->id, shm->size );
+    if ( -1 == end ) {
+        _PR_MD_MAP_DEFAULT_ERROR( errno );
+        PR_LOG(_pr_shm_lm, PR_LOG_DEBUG, 
+            ("_MD_OpenSharedMemory(): ftruncate failed, OSError: %d",
+                PR_GetOSError()));
+        PR_DELETE( shm->ipcname );
+        PR_DELETE( shm );
+        return(NULL);
+    }
+
+    return(shm);
+} /* end _MD_OpenSharedMemory() */
+
+extern void * _MD_AttachSharedMemory( PRSharedMemory *shm, PRIntn flags )
+{
+    void        *addr;
+    PRIntn      prot = (PROT_READ | PROT_WRITE);
+
+    PR_ASSERT( shm->ident == _PR_SHM_IDENT );
+
+    if ( PR_SHM_READONLY == flags)
+        prot ^= PROT_WRITE;
+
+    addr = mmap( (void*)0, shm->size, prot, MAP_SHARED, shm->id, 0 );
+    if ((void*)-1 == addr )
+    {
+        _PR_MD_MAP_DEFAULT_ERROR( errno );
+        PR_LOG( _pr_shm_lm, PR_LOG_DEBUG, 
+            ("_MD_AttachSharedMemory(): mmap failed: %s, errno: %d",
+                shm->ipcname, PR_GetOSError()));
+        addr = NULL;
+    } else {
+        PR_LOG( _pr_shm_lm, PR_LOG_DEBUG, 
+            ("_MD_AttachSharedMemory(): name: %s, attached at: %p", shm->ipcname, addr));
+    }
+    
+    return addr;
+}    
+
+extern PRStatus _MD_DetachSharedMemory( PRSharedMemory *shm, void *addr )
+{
+    PRStatus    rc = PR_SUCCESS;
+    PRIntn      urc;
+
+    PR_ASSERT( shm->ident == _PR_SHM_IDENT );
+
+    urc = munmap( addr, shm->size );
+    if ( -1 == urc )
+    {
+        rc = PR_FAILURE;
+        _PR_MD_MAP_DEFAULT_ERROR( errno );
+        PR_LOG( _pr_shm_lm, PR_LOG_DEBUG, 
+            ("_MD_DetachSharedMemory(): munmap failed: %s, errno: %d", 
+                shm->ipcname, PR_GetOSError()));
+    }
+    return rc;
+}    
+
+extern PRStatus _MD_CloseSharedMemory( PRSharedMemory *shm )
+{
+    int urc;
+    
+    PR_ASSERT( shm->ident == _PR_SHM_IDENT );
+
+    urc = close( shm->id );
+    if ( -1 == urc ) {
+        _PR_MD_MAP_CLOSE_ERROR( errno );
+        PR_LOG( _pr_shm_lm, PR_LOG_DEBUG, 
+            ("_MD_CloseSharedMemory(): close() failed, error: %d", PR_GetOSError()));
+        return(PR_FAILURE);
+    }
+    PR_DELETE( shm->ipcname );
+    PR_DELETE( shm );
+    return PR_SUCCESS;
+}    
+
+extern PRStatus _MD_DeleteSharedMemory( const char *name )
+{
+    PRStatus    rc = PR_SUCCESS;
+    PRUintn     urc;
+    char        ipcname[PR_IPC_NAME_SIZE];
+
+    rc = _PR_MakeNativeIPCName( name, ipcname, PR_IPC_NAME_SIZE, _PRIPCShm );
+    if ( PR_FAILURE == rc )
+    {
+        PR_SetError( PR_UNKNOWN_ERROR , errno );
+        PR_LOG( _pr_shm_lm, PR_LOG_DEBUG, 
+            ("_MD_OpenSharedMemory(): _PR_MakeNativeIPCName() failed: %s", name ));
+        return rc;
+    }
+
+    urc = shm_unlink( ipcname );
+    if ( -1 == urc ) {
+        rc = PR_FAILURE;
+        _PR_MD_MAP_DEFAULT_ERROR( errno );
+        PR_LOG( _pr_shm_lm, PR_LOG_DEBUG, 
+            ("_MD_DeleteSharedMemory(): shm_unlink failed: %s, errno: %d", 
+                ipcname, PR_GetOSError()));
+    } else {
+        PR_LOG( _pr_shm_lm, PR_LOG_DEBUG, 
+            ("_MD_DeleteSharedMemory(): %s, success", ipcname));
+    }
+
+    return rc;
+} /* end _MD_DeleteSharedMemory() */
+#endif
+
+
+
+/*
+** Unix implementation for anonymous memory (file) mapping
+*/
+extern PRLogModuleInfo *_pr_shma_lm;
+
+#include <unistd.h>
+
+extern PRFileMap* _md_OpenAnonFileMap( 
+    const char *dirName,
+    PRSize      size,
+    PRFileMapProtect prot
+)
+{
+    PRFileMap   *fm = NULL;
+    PRFileDesc  *fd;
+    int         osfd;
+    PRIntn      urc;
+    PRIntn      mode = 0600;
+    char        *genName;
+    pid_t       pid = getpid(); /* for generating filename */
+    PRThread    *tid = PR_GetCurrentThread(); /* for generating filename */
+    int         incr; /* for generating filename */
+    const int   maxTries = 20; /* maximum # attempts at a unique filename */
+    PRInt64     size64; /* 64-bit version of 'size' */
+
+    /*
+    ** generate a filename from input and runtime environment
+    ** open the file, unlink the file.
+    ** make maxTries number of attempts at uniqueness in the filename
+    */
+    for ( incr = 0; incr < maxTries ; incr++ ) {
+#if defined(SYMBIAN)
+#define NSPR_AFM_FILENAME "%s\\NSPR-AFM-%d-%p.%d"
+#else
+#define NSPR_AFM_FILENAME "%s/.NSPR-AFM-%d-%p.%d"
+#endif
+        genName = PR_smprintf( NSPR_AFM_FILENAME,
+            dirName, (int) pid, tid, incr );
+        if ( NULL == genName ) {
+            PR_LOG( _pr_shma_lm, PR_LOG_DEBUG,
+                ("_md_OpenAnonFileMap(): PR_snprintf(): failed, generating filename"));
+            goto Finished;
+        }
+        
+        /* create the file */
+        osfd = open( genName, (O_CREAT | O_EXCL | O_RDWR), mode );
+        if ( -1 == osfd ) {
+            if ( EEXIST == errno )  {
+                PR_smprintf_free( genName );
+                continue; /* name exists, try again */
+            } else {
+                _PR_MD_MAP_OPEN_ERROR( errno );
+                PR_LOG( _pr_shma_lm, PR_LOG_DEBUG,
+                    ("_md_OpenAnonFileMap(): open(): failed, filename: %s, errno: %d", 
+                        genName, PR_GetOSError()));
+                PR_smprintf_free( genName );
+                goto Finished;
+            }
+        }
+        break; /* name generation and open successful, break; */
+    } /* end for() */
+
+    if ( incr == maxTries ) {
+        PR_ASSERT( -1 == osfd );
+        PR_ASSERT( EEXIST == errno );
+        _PR_MD_MAP_OPEN_ERROR( errno );
+        goto Finished;
+    }
+
+    urc = unlink( genName );
+#if defined(SYMBIAN) && defined(__WINS__)
+    /* If it is being used by the system or another process, Symbian OS 
+     * Emulator(WINS) considers this an error. */
+    if ( -1 == urc && EACCES != errno ) {
+#else
+    if ( -1 == urc ) {
+#endif
+        _PR_MD_MAP_UNLINK_ERROR( errno );
+        PR_LOG( _pr_shma_lm, PR_LOG_DEBUG,
+            ("_md_OpenAnonFileMap(): failed on unlink(), errno: %d", errno));
+        PR_smprintf_free( genName );
+        close( osfd );
+        goto Finished;        
+    }
+    PR_LOG( _pr_shma_lm, PR_LOG_DEBUG,
+        ("_md_OpenAnonFileMap(): unlink(): %s", genName ));
+
+    PR_smprintf_free( genName );
+
+    fd = PR_ImportFile( osfd );
+    if ( NULL == fd ) {
+        PR_LOG( _pr_shma_lm, PR_LOG_DEBUG,
+            ("_md_OpenAnonFileMap(): PR_ImportFile(): failed"));
+        goto Finished;        
+    }
+    PR_LOG( _pr_shma_lm, PR_LOG_DEBUG,
+        ("_md_OpenAnonFileMap(): fd: %p", fd ));
+
+    urc = ftruncate( fd->secret->md.osfd, size );
+    if ( -1 == urc ) {
+        _PR_MD_MAP_DEFAULT_ERROR( errno );
+        PR_LOG( _pr_shma_lm, PR_LOG_DEBUG,
+            ("_md_OpenAnonFileMap(): failed on ftruncate(), errno: %d", errno));
+        PR_Close( fd );
+        goto Finished;        
+    }
+    PR_LOG( _pr_shma_lm, PR_LOG_DEBUG,
+        ("_md_OpenAnonFileMap(): ftruncate(): size: %d", size ));
+
+    LL_UI2L(size64, size);  /* PRSize (size_t) is unsigned */
+    fm = PR_CreateFileMap( fd, size64, prot );
+    if ( NULL == fm )  {
+        PR_LOG( _pr_shma_lm, PR_LOG_DEBUG,
+            ("PR_OpenAnonFileMap(): failed"));
+        PR_Close( fd );
+        goto Finished;        
+    }
+    fm->md.isAnonFM = PR_TRUE; /* set fd close */
+
+    PR_LOG( _pr_shma_lm, PR_LOG_DEBUG,
+        ("_md_OpenAnonFileMap(): PR_CreateFileMap(): fm: %p", fm ));
+
+Finished:    
+    return(fm);
+} /* end md_OpenAnonFileMap() */
+
+/*
+** _md_ExportFileMapAsString()
+**
+**
+*/
+extern PRStatus _md_ExportFileMapAsString(
+    PRFileMap *fm,
+    PRSize    bufSize,
+    char      *buf
+)
+{
+    PRIntn  written;
+    PRIntn  prot = (PRIntn)fm->prot;
+    
+    written = PR_snprintf( buf, bufSize, "%ld:%d",
+        fm->fd->secret->md.osfd, prot );
+        
+    return((written == -1)? PR_FAILURE : PR_SUCCESS);
+} /* end _md_ExportFileMapAsString() */
+
+
+extern PRFileMap * _md_ImportFileMapFromString(
+    const char *fmstring
+)
+{
+    PRStatus    rc;
+    PRInt32     osfd;
+    PRIntn      prot; /* really: a PRFileMapProtect */
+    PRFileDesc  *fd;
+    PRFileMap   *fm = NULL; /* default return value */
+    PRFileInfo64 info;
+
+    PR_sscanf( fmstring, "%ld:%d", &osfd, &prot );
+
+    /* import the os file descriptor */
+    fd = PR_ImportFile( osfd );
+    if ( NULL == fd ) {
+        PR_LOG( _pr_shma_lm, PR_LOG_DEBUG,
+            ("_md_ImportFileMapFromString(): PR_ImportFile() failed"));
+        goto Finished;
+    }
+
+    rc = PR_GetOpenFileInfo64( fd, &info );
+    if ( PR_FAILURE == rc )  {
+        PR_LOG( _pr_shma_lm, PR_LOG_DEBUG,
+            ("_md_ImportFileMapFromString(): PR_GetOpenFileInfo64() failed"));    
+        goto Finished;
+    }
+
+    fm = PR_CreateFileMap( fd, info.size, (PRFileMapProtect)prot );
+    if ( NULL == fm ) {
+        PR_LOG( _pr_shma_lm, PR_LOG_DEBUG,
+            ("_md_ImportFileMapFromString(): PR_CreateFileMap() failed"));    
+    }
+
+Finished:
+    return(fm);
+} /* end _md_ImportFileMapFromString() */