From: Tom Lane <tgl@sss.pgh.pa.us>
Date: Thu, 28 Jun 2012 18:18:31 +0000 (-0400)
Subject: Provide MAP_FAILED if sys/mman.h doesn't.
X-Git-Tag: REL9_3_BETA1~1278
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=c1494b733015bf09d75c362925ec3f2740a77f73;p=postgresql

Provide MAP_FAILED if sys/mman.h doesn't.

On old HPUX this has to be #defined to -1.  It might be that other values
are required on other dinosaur systems, but we'll worry about that when
and if we get reports.
---

diff --git a/src/backend/port/sysv_shmem.c b/src/backend/port/sysv_shmem.c
index 20f31ed218..8f1da7a7ef 100644
--- a/src/backend/port/sysv_shmem.c
+++ b/src/backend/port/sysv_shmem.c
@@ -56,6 +56,12 @@ typedef int IpcMemoryId;		/* shared memory ID returned by shmget(2) */
 
 #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
+
+
 unsigned long UsedShmemSegID = 0;
 void	   *UsedShmemSegAddr = NULL;
 static Size AnonymousShmemSize;