The ndesk segfault is due to an inconsistency in how structs are passed
in pinvoke. On ppc structs are always passed by-address. This is how
GIOChannel is wrapped in ndesk-glib:
struct IOChannel
{
const string GLIB = "libglib-2.0-0.dll";
public IntPtr Handle;
[DllImport(GLIB)]
static extern IntPtr g_io_channel_unix_new (int fd);
public IOChannel (int fd)
{
Handle = g_io_channel_unix_new (fd);
}
[snip]
Then g_io_add_watch is defined as a pinvoke method:
[snip]
[DllImport(GLIB)]
protected static extern uint g_io_add_watch (IOChannel
channel, IOCondition condition, IOFunc func, IntPtr user_data);
[snip]
The g_io_add_watch wrapper takes a IOChannel structure as its first argument.
The real g_io_add_watch takes a GIOChannel * argument as first argument.
On x86 this works because IOChannel is passed by value, so the GIOChannel *
pointer in the real g_io_add_watch gets the value of IOChannel::Handle which
points to the right location.
On ppc IOChannel is passed by address, so the GIOChannel * pointer in the real
g_io_add_watch gets *a pointer* to IOChannel::Handle.
setting PPC_PASS_STRUCTS_BY_VALUE to 1 in mono/mini/mini-ppc.h and
recompiling fixes the bug here. Anyway i don't know why it is set to 0
by default and if changing it has any drawbacks.
--
mono always crashes on ppc
https://bugs.launchpad.net/bugs/122496
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