#include <fcntl.h>
#include <unistd.h>
+#include <c-ctype.h>
+
#include "lisp.h"
#include "w32term.h"
#include "frame.h"
#else /* !CYGWIN */
- current_dir = ENCODE_FILE (current_dir);
+ const char file_url_str[] = "file:///";
+ const int file_url_len = sizeof (file_url_str) - 1;
+ if (strncmp (SSDATA (document), file_url_str, file_url_len) == 0)
+ {
+ /* Passing "file:///" URLs to ShellExecute causes shlwapi.dll to
+ start a thread in some rare system configurations, for
+ unknown reasons. That thread is started in the context of
+ the Emacs process, but out of control of our code, and seems
+ to never exit afterwards. Each such thread reserves 8MB of
+ stack space (because that's the value recorded in the Emacs
+ executable at link time: Emacs needs a large stack). So a
+ large enough number of invocations of w32-shell-execute can
+ potentially cause the Emacs process to run out of available
+ address space, which is nasty. To work around this, we
+ convert such URLs to local file names, which seems to prevent
+ those threads from starting. See bug #20220. */
+ char *p = SSDATA (document) + file_url_len;
+
+ if (c_isalpha (*p) && p[1] == ':' && IS_DIRECTORY_SEP (p[2]))
+ document = Fsubstring_no_properties (document,
+ make_number (file_url_len), Qnil);
+ }
/* We have a situation here. If DOCUMENT is a relative file name,
but its name includes leading directories, i.e. it lives not in
CURRENT_DIR, but in its subdirectory, then ShellExecute below
else
document = ENCODE_FILE (document);
UNGCPRO;
+
+ current_dir = ENCODE_FILE (current_dir);
if (use_unicode)
{
wchar_t document_w[MAX_PATH], current_dir_w[MAX_PATH];