greenplumn link-canary 源码
greenplumn link-canary 代码
文件路径：/src/common/link-canary.c
/*-------------------------------------------------------------------------
* link-canary.c
* Detect whether src/common functions came from frontend or backend.
*
* Copyright (c) 2018-2019, PostgreSQL Global Development Group
*
* IDENTIFICATION
* src/common/link-canary.c
*
*-------------------------------------------------------------------------
*/
#include "c.h"
#include "common/link-canary.h"
/*
* This function just reports whether this file was compiled for frontend
* or backend environment. We need this because in some systems, mainly
* ELF-based platforms, it is possible for a shlib (such as libpq) loaded
* into the backend to call a backend function named XYZ in preference to
* the shlib's own function XYZ. That's bad if the two functions don't
* act identically. This exact situation comes up for many functions in
* src/common and src/port, where the same function names exist in both
* libpq and the backend but they don't act quite identically. To verify
* that appropriate measures have been taken to prevent incorrect symbol
* resolution, libpq should test that this function returns true.
*/
bool
pg_link_canary_is_frontend(void)
{
#ifdef FRONTEND
return true;
#else
return false;
#endif
}
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