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

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

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src/backend/port
- sysv_shmem.c

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`‎src/backend/port/sysv_shmem.c`

Lines changed: 6 additions & 0 deletions

Original file line number	Diff line number	Diff line change
`@@ -56,6 +56,12 @@ typedef int IpcMemoryId;/* shared memory ID returned by shmget(2) */`
`56`	`56`
`57`	`57`	`#definePG_MMAP_FLAGS(MAP_SHARED\|MAP_ANONYMOUS\|MAP_HASSEMAPHORE)`
`58`	`58`
	`59`	`+/* Some really old systems don't define MAP_FAILED. */`
	`60`	`+#ifndefMAP_FAILED`
	`61`	`+#defineMAP_FAILED ((void *) -1)`
	`62`	`+#endif`
	`63`	`+`
	`64`	`+`
`59`	`65`	`unsigned longUsedShmemSegID=0;`
`60`	`66`	`void*UsedShmemSegAddr=NULL;`
`61`	`67`	`staticSizeAnonymousShmemSize;`

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Commitc1494b7

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`‎src/backend/port/sysv_shmem.c`

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