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glib/gspawn-win32-helper.c: Clean up a bit

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Remove the parts about storing up the fd's in a data structure, but call
close() on the fd's.  However, retain the _get_osfhandle() check on the
fd's when we iterate through the fd's as on fd values in the iteration may
well be invalid fd's.  As a result, the invalid parameter handler is still
needed for newer Microsoft CRTs (8.0/2005+) for _get_osfhandle() to
make sure that the program does not abort when we check the validity of
fd's to be closed in the loop[1].

[1]: http://msdn.microsoft.com/en-us/library/ks2530z6%28v=vs.80%29.aspx
This commit is contained in:
Chun-wei Fan 2013-11-05 15:51:08 +08:00
parent ccba409d34
commit 5fd3c63ae8
1 changed files with 18 additions and 29 deletions
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47
glib/gspawn-win32-helper.c
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@ -25,8 +25,13 @@
/* For _CrtSetReportMode, we don't want Windows CRT (2005 and later)
* to terminate the process if a bad file descriptor is passed into
* _get_osfhandle. The newer MS CRT's are picky
* on double close()'s and bad file descriptors.
* _get_osfhandle(). This is necessary because we use _get_osfhandle()
* to check the validity of the fd before we try to call close() on
* it as attempting to close an invalid fd will cause the Windows CRT
* to abort() this program internally.
*
* Please see http://msdn.microsoft.com/zh-tw/library/ks2530z6%28v=vs.80%29.aspx
* for an explanation on this.
*/
#if (defined (_MSC_VER) && _MSC_VER >= 1400)
#include <crtdbg.h>
@ -161,13 +166,15 @@ protect_wargv (wchar_t **wargv,
* This is the (empty) invalid parameter handler
* that is used for Visual C++ 2005 (and later) builds
* so that we can use this instead of the system automatically
* aborting the process, as the newer MS CRTs are more picky
* about double close()'s and bad/invalid file descriptors.
* aborting the process.
*
* This is necessary as we use _get_oshandle() to check the validity
* of the file descriptors as we close them, so when an invalid file
* descriptor is passed into that function as we check on it, we get
* -1 as the result, instead of the gspawn helper program aborting.
*
* Please see http://msdn.microsoft.com/zh-tw/library/ks2530z6%28v=vs.80%29.aspx
* for an explanation on this.
*/
void myInvalidParameterHandler(
const wchar_t * expression,
@ -208,10 +215,6 @@ main (int ignored_argc, char **ignored_argv)
_startupinfo si = { 0 };
char c;
/* store up the file descriptors to close */
GSList *fd_toclose = NULL;
GSList *last_item = NULL;
#if (defined (_MSC_VER) && _MSC_VER >= 1400)
/* set up our empty invalid parameter handler */
_invalid_parameter_handler oldHandler, newHandler;
@ -267,7 +270,7 @@ main (int ignored_argc, char **ignored_argv)
if (fd != 0)
{
dup2 (fd, 0);
fd_toclose = g_slist_append (fd_toclose, GINT_TO_POINTER (fd));
close (fd);
}
}
else
@ -276,7 +279,7 @@ main (int ignored_argc, char **ignored_argv)
if (fd != 0)
{
dup2 (fd, 0);
fd_toclose = g_slist_append (fd_toclose, GINT_TO_POINTER (fd));
close (fd);
}
}
@ -288,7 +291,7 @@ main (int ignored_argc, char **ignored_argv)
if (fd != 1)
{
dup2 (fd, 1);
fd_toclose = g_slist_append (fd_toclose, GINT_TO_POINTER (fd));
close (fd);
}
}
else
@ -297,7 +300,7 @@ main (int ignored_argc, char **ignored_argv)
if (fd != 1)
{
dup2 (fd, 1);
fd_toclose = g_slist_append (fd_toclose, GINT_TO_POINTER (fd));
close (fd);
}
}
@ -309,7 +312,7 @@ main (int ignored_argc, char **ignored_argv)
if (fd != 2)
{
dup2 (fd, 2);
fd_toclose = g_slist_append (fd_toclose, GINT_TO_POINTER (fd));
close (fd);
}
}
else
@ -318,7 +321,7 @@ main (int ignored_argc, char **ignored_argv)
if (fd != 2)
{
dup2 (fd, 2);
fd_toclose = g_slist_append (fd_toclose, GINT_TO_POINTER (fd));
close (fd);
}
}
@ -338,21 +341,7 @@ main (int ignored_argc, char **ignored_argv)
for (i = 3; i < 1000; i++) /* FIXME real limit? */
if (i != child_err_report_fd && i != helper_sync_fd)
if (_get_osfhandle (i) != -1)
fd_toclose = g_slist_append (fd_toclose, GINT_TO_POINTER (i));
/* ...so we won't get the nasty off-by-1 file descriptor leak */
fd_toclose = g_slist_append (fd_toclose, NULL);
last_item = g_slist_last (fd_toclose);
/* now close all the file descriptors as necessary */
if (fd_toclose != NULL && last_item != NULL)
{
for ( ; fd_toclose != last_item; fd_toclose = fd_toclose->next)
close (GPOINTER_TO_INT(fd_toclose->data));
}
g_slist_free (last_item);
g_slist_free (fd_toclose);
close (i);
/* We don't want our child to inherit the error report and
* helper sync fds.