Re: passfd on more platforms

[Bastien ROUCARIES]

On Mon, Mar 14, 2011 at 12:38 AM, Bruno Haible <address@hidden> wrote:
> Here's the result of testing passfd:
>
> Linux      OK      BSD4.4 way, MSG_CMSG_CLOEXEC
> FreeBSD    OK      BSD4.4 way
> OpenBSD    OK      BSD4.4 way
> NetBSD     FAIL    BSD4.4 way
> AIX        OK      BSD4.4 way
> HP-UX      OK      BSD4.3 way
> IRIX       OK      BSD4.3 way
> OSF/1      OK      BSD4.4 way
> Solaris    OK      BSD4.3 way
> Cygwin     FAIL    BSD4.4 way
>
> It is a bit surprising that Solaris 10 says that it doesn't support the
> BSD4.4 way. That is because
>  checking for UNIX domain sockets SCM_RIGHTS that behave in BSD4.4 way... no
> because CMSG_SPACE etc. are not declared by <sys/socket.h> by default.
> I'm not sure whether gnulib should define _XOPEN_SOURCE, 
> _XOPEN_SOURCE_EXTENDED,
> or _POSIX_C_SOURCE. But's let's leave it as is for now, since the BSD4.3 way
> works.
>
> On NetBSD 5.0, the test reports
>  sendfd: Invalid argument
> and then hangs.

according to postfix source NETBSD seems really strange... Do you know
how to test ?
/*
     * The CMSG_LEN send/receive workaround was originally developed for
     * OpenBSD 3.6 on SPARC64. After the workaround was verified to not break
     * Solaris 8 on SPARC64, it was hard-coded with Postfix 2.3 for all
     * platforms because of increasing pressure to work on other things. The
     * workaround does nothing for 32-bit systems.
     *
     * The investigation was reopened with Postfix 2.7 because the workaround
     * broke with NetBSD 5.0 on 64-bit architectures. This time it was found
     * that OpenBSD <= 4.3 on AMD64 and SPARC64 needed the workaround for
     * sending only. The following platforms worked with and without the
     * workaround: OpenBSD 4.5 on AMD64 and SPARC64, FreeBSD 7.2 on AMD64,
     * Solaris 8 on SPARC64, and Linux 2.6-11 on x86_64.
     *
     * As this appears to have been an OpenBSD-specific problem, we revert to
     * the Postfix 2.2 behavior. Instead of hard-coding the workaround for
     * all platforms, we now detect sendmsg() errors at run time and turn on
     * the workaround dynamically.
     *
     * The workaround was made run-time configurable to investigate the problem
     * on multiple platforms. Though set_unix_pass_fd_fix() is over-kill for
     * this specific problem, it is left in place so that it can serve as an
     * example of how to add run-time configurable workarounds to Postfix.
     */


> On Cygwin, the test fails:
>  recvfd: Permission denied
>  FAIL: test-passfd.exe

cygwin does not implement this feature and will resort to use mingw
emulation of part of, until fixed in core...

> On mingw, I haven't even tried the module. It first requires
>  - a 'socketpair' module for the test,
In all the case passing fd is done through socket

>  - to rewrite the test to use the 'execute' module instead of fork().

Bastien