1 files changed, 127 insertions, 0 deletions
diff --git a/lib/base/shmem.cpp b/lib/base/shmem.cpp
new file mode 100644
index 00000000..1ddd76d3
--- /dev/null
+++ b/lib/base/shmem.cpp
@@ -0,0 +1,127 @@
+/** BEGIN COPYRIGHT BLOCK
+ * Copyright 2001 Sun Microsystems, Inc.
+ * Portions copyright 1999, 2001-2003 Netscape Communications Corporation.
+ * All rights reserved.
+ * END COPYRIGHT BLOCK **/
+/*
+ * shmem.h: Portable abstraction for memory shared among a server's workers
+ * 
+ * Rob McCool
+ */
+
+
+#include "shmem.h"
+
+#if defined (SHMEM_UNIX_MMAP)
+
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <unistd.h>
+#include <private/pprio.h>  /* for nspr20 binary release */
+
+NSPR_BEGIN_EXTERN_C
+#include <sys/mman.h>
+NSPR_END_EXTERN_C
+
+NSAPI_PUBLIC shmem_s *shmem_alloc(char *name, int size, int expose)
+{
+    shmem_s *ret = (shmem_s *) PERM_MALLOC(sizeof(shmem_s));
+    char *growme;
+
+    if( (ret->fd = PR_Open(name, PR_RDWR | PR_CREATE_FILE | PR_TRUNCATE, 0666)) == NULL) {
+        PERM_FREE(ret);
+        return NULL;
+    }
+    growme = (char *) PERM_MALLOC(size);
+    ZERO(growme, size);
+    if(PR_Write(ret->fd, (char *)growme, size) < 0) {
+        PR_Close(ret->fd);
+        PERM_FREE(growme);
+        PERM_FREE(ret);
+        return NULL;
+    }
+    PERM_FREE(growme);
+    PR_Seek(ret->fd, 0, PR_SEEK_SET);
+    if( (ret->data = (char *)mmap(NULL, size, PROT_READ | PROT_WRITE,
+                          SHMEM_MMAP_FLAGS, PR_FileDesc2NativeHandle(ret->fd), 0)) == (caddr_t) -1)
+    {
+        PR_Close(ret->fd);
+        PERM_FREE(ret);
+        return NULL;
+    }
+    if(!expose) {
+        ret->name = NULL;
+        unlink(name);
+    }
+    else
+        ret->name = STRDUP(name);
+    ret->size = size;
+    return ret;
+}
+
+
+NSAPI_PUBLIC void shmem_free(shmem_s *region)
+{
+    if(region->name) {
+        unlink(region->name);
+        PERM_FREE(region->name);
+    }
+    munmap((char *)region->data, region->size);  /* CLEARLY, C++ SUCKS */
+    PR_Close(region->fd);
+    PERM_FREE(region);
+}
+
+#elif defined (SHMEM_WIN32_MMAP)
+
+#define PAGE_SIZE	(1024*8)
+#define ALIGN(x)	( (x+PAGE_SIZE-1) & (~(PAGE_SIZE-1)) )
+NSAPI_PUBLIC shmem_s *shmem_alloc(char *name, int size, int expose)
+{
+    shmem_s *ret = (shmem_s *) PERM_MALLOC(sizeof(shmem_s));
+    HANDLE fHandle;
+
+    ret->fd = 0; /* not used on NT */
+  
+    size = ALIGN(size);
+    if( !(ret->fdmap = CreateFileMapping(
+                           (HANDLE)0xffffffff,
+                           NULL, 
+                           PAGE_READWRITE,
+                           0, 
+                           size, 
+                           name)) )
+    {
+        int err = GetLastError();
+        PERM_FREE(ret);
+        return NULL;
+    }
+    if( !(ret->data = (char *)MapViewOfFile (
+                               ret->fdmap, 
+                               FILE_MAP_ALL_ACCESS,
+                               0, 
+                               0, 
+                               0)) )
+    {
+        CloseHandle(ret->fdmap);
+        PERM_FREE(ret);
+        return NULL;
+    }
+    ret->size = size;
+    ret->name = NULL;
+
+    return ret;
+}
+
+
+NSAPI_PUBLIC void shmem_free(shmem_s *region)
+{
+    if(region->name) {
+        DeleteFile(region->name);
+        PERM_FREE(region->name);
+    }
+    UnmapViewOfFile(region->data);
+    CloseHandle(region->fdmap);
+    PERM_FREE(region);
+}
+
+#endif /* SHMEM_WIN32_MMAP */