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On some Linux systems, dlsym("realpath", RTLD_NEXT) prefers
for reasons of its own to give a symbol that is also known
as old_realpath, which fails and yields EINVAL when called
with a null pointer as the second argument. This can be
avoided, on some systems, by using dlvsym() to request
the GLIBC_2.3 version of the symbol.
The wrapper logic is enhanced to allow for specifying
versions, although this currently only works for Linux
(Darwin has no dlvsym, apparently?). The test case is
a trivial program which calls realpath(name, NULL) run
with PSEUDO_DISABLED=1.
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that we add an extra fork() so we can do the setup in a child process,
but still just pass the command string to the standard system()
call.
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This is a spiffied-up rebase of a bunch of intermediate changes, presented
as a whole because it is, surprisingly, less confusing that way. The basic
idea is to separate the guts code into categories ranging from generic
stuff that can be the same everywhere and specific variants. The big scary
one is the Darwin support, which actually seems to run okay on 64-bit OS X
10.6. (No other variants were tested.) The other example given is support
for the old clone() syscall on RHEL 4, which affects some wrlinux use cases.
There's a few minor cleanup bits here, such as a function with inconsistent
calling conventions, but nothing really exciting.
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Peter Seebach