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 20f31ed218d7e6f9617da3b4cc3d8d465d8c3e5d..8f1da7a7ef4310225972ad53c5e29debd0020965 100644 (file)
--- 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;