From 2771b5b52b3ed7a64c9e7c820518c9266915958b Mon Sep 17 00:00:00 2001
From: Jack Jansen <jack.jansen@cwi.nl>
Date: Wed, 10 Oct 2001 22:03:27 +0000
Subject: [PATCH] Rather gross workaround for a bug in the mac GUSI I/O
 library: lseek(fp, 0L, SEEK_CUR) can make a filedescriptor unusable. This
 workaround is expected to last only a few weeks (until GUSI is fixed), but
 without it test_email fails.

---
 Objects/fileobject.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/Objects/fileobject.c b/Objects/fileobject.c
index 9a249aa61b7..8f903d1b467 100644
--- a/Objects/fileobject.c
+++ b/Objects/fileobject.c
@@ -523,9 +523,15 @@ new_buffersize(PyFileObject *f, size_t currentsize)
 		   works.  We can't use the lseek() value either, because we
 		   need to take the amount of buffered data into account.
 		   (Yet another reason why stdio stinks. :-) */
+#ifdef USE_GUSI2
+		pos = lseek(fileno(f->f_fp), 1L, SEEK_CUR);
+		pos = lseek(fileno(f->f_fp), -1L, SEEK_CUR);
+#else
 		pos = lseek(fileno(f->f_fp), 0L, SEEK_CUR);
-		if (pos >= 0)
+#endif
+		if (pos >= 0) {
 			pos = ftell(f->f_fp);
+		}
 		if (pos < 0)
 			clearerr(f->f_fp);
 		if (end > pos && pos >= 0)