Adding upstream version 15.5.upstream/15.5

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 48 insertions, 0 deletions

diff --git a/src/include/portability/mem.h b/src/include/portability/mem.h
new file mode 100644
index 0000000..b553b40
--- /dev/null
+++ b/src/include/portability/mem.h
@@ -0,0 +1,48 @@
+/*-------------------------------------------------------------------------
+ *
+ * mem.h
+ *	  portability definitions for various memory operations
+ *
+ * Copyright (c) 2001-2022, PostgreSQL Global Development Group
+ *
+ * src/include/portability/mem.h
+ *
+ *-------------------------------------------------------------------------
+ */
+#ifndef MEM_H
+#define MEM_H
+
+#define IPCProtection	(0600)	/* access/modify by user only */
+
+#ifdef SHM_SHARE_MMU			/* use intimate shared memory on Solaris */
+#define PG_SHMAT_FLAGS			SHM_SHARE_MMU
+#else
+#define PG_SHMAT_FLAGS			0
+#endif
+
+/* Linux prefers MAP_ANONYMOUS, but the flag is called MAP_ANON on other systems. */
+#ifndef MAP_ANONYMOUS
+#define MAP_ANONYMOUS			MAP_ANON
+#endif
+
+/* BSD-derived systems have MAP_HASSEMAPHORE, but it's not present (or needed) on Linux. */
+#ifndef MAP_HASSEMAPHORE
+#define MAP_HASSEMAPHORE		0
+#endif
+
+/*
+ * BSD-derived systems use the MAP_NOSYNC flag to prevent dirty mmap(2)
+ * pages from being gratuitously flushed to disk.
+ */
+#ifndef MAP_NOSYNC
+#define MAP_NOSYNC			0
+#endif
+
+#define PG_MMAP_FLAGS			(MAP_SHARED|MAP_ANONYMOUS|MAP_HASSEMAPHORE)
+
+/* Some really old systems don't define MAP_FAILED. */
+#ifndef MAP_FAILED
+#define MAP_FAILED ((void *) -1)
+#endif
+
+#endif							/* MEM_H */