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rather than trying to implement the equivalent logic by hand. The motivation for the original coding appears to have been to check with the effective uid's permissions not the real uid's; but there is no longer any difference, because we don't run the postmaster setuid (indeed, main.c enforces that they're the same). Using access() means we will get it right in situations the original coding failed to handle, such as ACL-based permissions. Besides it's a lot shorter, cleaner, and more thread-safe. Per bug #5275 from James Bellinger.
$PostgreSQL: pgsql/src/port/README,v 1.4 2008/03/21 13:23:29 momjian Exp $
libpgport
=========
libpgport must have special behavior. It supplies functions to both
libraries and applications. However, there are two complexities:
1) Libraries need to use object files that are compiled with exactly
the same flags as the library. libpgport might not use the same flags,
so it is necessary to recompile the object files for individual
libraries. This is done by removing -lpgport from the link line:
# Need to recompile any libpgport object files
LIBS := $(filter-out -lpgport, $(LIBS))
and adding infrastructure to recompile the object files:
OBJS= execute.o typename.o descriptor.o data.o error.o prepare.o memory.o \
connect.o misc.o path.o exec.o \
$(filter snprintf.o, $(LIBOBJS))
The problem is that there is no testing of which object files need to be
added, but missing functions usually show up when linking user
applications.
2) For applications, we use -lpgport before -lpq, so the static files
from libpgport are linked first. This avoids having applications
dependent on symbols that are _used_ by libpq, but not intended to be
exported by libpq. libpq's libpgport usage changes over time, so such a
dependency is a problem. Win32, Linux, and Darwin use an export list to
control the symbols exported by libpq.