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Commit8201b60

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Make EXEC_BACKEND more convenient on macOS.
It's hard to disable ASLR on current macOS releases, for testing with-DEXEC_BACKEND. You could already set the environment variablePG_SHMEM_ADDR to something not likely to collide with mappings createdearlier in process startup. Let's also provide a default value thatworks on current releases and architectures, for developer convenience.As noted in the pre-existing comment, this is a horrible hack, but-DEXEC_BACKEND is only used by Unix-based PostgreSQL developers fortesting some otherwise Windows-only code paths, so it seems excusable.Back-patch to all supported branches.Reviewed-by: Tom Lane <tgl@sss.pgh.pa.us>Discussion:https://postgr.es/m/20210806032944.m4tz7j2w47mant26%40alap3.anarazel.de
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‎src/backend/port/sysv_shmem.c

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@@ -143,6 +143,16 @@ InternalIpcMemoryCreate(IpcMemoryKey memKey, Size size)
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if (pg_shmem_addr)
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requestedAddress= (void*)strtoul(pg_shmem_addr,NULL,0);
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else
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{
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#if defined(__darwin__)&&SIZEOF_VOID_P==8
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/*
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* Provide a default value that is believed to avoid problems with
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* ASLR on the current macOS release.
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*/
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requestedAddress= (void*)0x80000000000;
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#endif
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}
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}
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#endif
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