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Message-ID: <53AB82AB.5000304@cornell.edu>
Date: Wed, 25 Jun 2014 22:17:15 -0400
From: Ken Brown <kbrown AT cornell DOT edu>
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To: cygwin <cygwin AT cygwin DOT com>
Subject: Crash in g_file_monitor on 32-bit Cygwin
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This is a followup to https://cygwin.com/ml/cygwin/2014-06/msg00324.html, from which I extracted the following test case:

$ cat gfile-test.c
#include <stdio.h>
#include <gio/gio.h>

void
gfile_add_watch (const char *file)
{
  GFile *gfile = g_file_new_for_path (file);
  GFileMonitor *monitor;
  GFileMonitorFlags gflags = G_FILE_MONITOR_NONE;
  monitor = g_file_monitor (gfile, gflags, NULL, NULL);
  if (! monitor)
    printf ("Can't watch file %s\n", file);
  else
    printf ("Watching file %s\n", file);
}

int
main ()
{
  const char *file = "gfile-test.c";
  gfile_add_watch (file);
}

$ gcc -g -O0 -o gfile-test $(pkg-config --cflags gio-2.0) gfile-test.c $(pkg-config --libs gio-2.0)

In the 64-bit case, this behaves as expected:

$ ./gfile-test.exe
Watching file gfile-test.c

In the 32-bit case, however, it crashes.  Running it under gdb shows that the call to g_file_monitor leads to a SEGV, but I can't tell exactly where; when I try to single step through the Glib code, I eventually hit an assertion violation in gdb.  strace shows lots of exceptions, but I can't make much sense out of it otherwise.

Ken

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