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37 lines
1.2 KiB
C
37 lines
1.2 KiB
C
/*-------------------------------------------------------------------------
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* link-canary.c
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* Detect whether src/common functions came from frontend or backend.
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*
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* Copyright (c) 2018-2020, PostgreSQL Global Development Group
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*
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* IDENTIFICATION
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* src/common/link-canary.c
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*
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*-------------------------------------------------------------------------
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*/
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#include "c.h"
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#include "common/link-canary.h"
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/*
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* This function just reports whether this file was compiled for frontend
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* or backend environment. We need this because in some systems, mainly
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* ELF-based platforms, it is possible for a shlib (such as libpq) loaded
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* into the backend to call a backend function named XYZ in preference to
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* the shlib's own function XYZ. That's bad if the two functions don't
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* act identically. This exact situation comes up for many functions in
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* src/common and src/port, where the same function names exist in both
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* libpq and the backend but they don't act quite identically. To verify
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* that appropriate measures have been taken to prevent incorrect symbol
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* resolution, libpq should test that this function returns true.
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*/
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bool
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pg_link_canary_is_frontend(void)
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{
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#ifdef FRONTEND
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return true;
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#else
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return false;
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#endif
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}
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