update from main archive 961207cvs/libc-961208

Sun Dec  8 06:56:49 1996  Ulrich Drepper  <drepper@cygnus.com>

	* io/getwd.c: Use PATH_MAX not LOCAL_PATH_MAX.  Fix typo in
	comment.
	* stdlib/canonicalize.c: Correct bugs in last change.
	Patch by HJ Lu.

	* libio/Makefile (routines): Remove ioprims.
	(aux): Remove cleanup.
	Add IO_DEBUG option for .o files.
	* libio/cleanups.c: Removed.
	* libio/ioprims.c: Removed.
	* libio/filedoalloc.c: More updates from libg++-2.8b5.
	* libio/fileops.c: Likewise.
	* libio/genops.c: Likewise.
	* libio/iolibio.h: Likewise.
	* libio/iopopen.c: Likewise.
	* libio/iovsprintf.c: Likewise.
	* libio/iovsscanf.c: Likewise.
	* libio/libio.h: Likewise.
	* libio/libioP.h: Likewise.
	* libio/memstream.c: Likewise.
	* libio/strfile.h: Likewise.
	* libio/vasprintf.c: Likewise.
	* libio/vsnprintf.c: Likewise.

	* libio/stdio.h: Define P_tmpdir only is __USE_SVID.

	* manual/arith.texi: Change references to ANSI C to ISO C.
	* manual/conf.texi: Likewise.
	* manual/creature.texi: Likewise.
	* manual/ctype.texi: Likewise.
	* manual/errno.texi: Likewise.
	* manual/filesys.texi: Likewise.
	* manual/intro.texi. Likewise.
	* manual/io.texi: Likewise.
	* manual/lang.texi: Likewise.
	* manual/libc.texinfo: Likewise.
	* manual/locale.texi: Likewise.
	* manual/maint.texi: Likewise.
	* manual/mbyte.texi: Likewise.
	* manual/memory.texi: Likewise.
	* manual/process.texi: Likewise.
	* manual/process.texi: Likewise.
	* manual/search.texi: Likewise.
	* manual/setjmp.texi: Likewise.
	* manual/signal.texi: Likewise.
	* manual/startup.texi: Likewise.
	* manual/stdio.texi: Likewise.
	* manual/string.texi: Likewise.
	* manual/time.texi: Likewise.

	* manual/locale.texi: Remove description of LC_RESPONSE and add
	LC_MESSAGES.

	* Makefile (subdirs): Change malloc in $(malloc).
	* config.make.in: Add variable malloc which is initialized from
	@malloc@.
	* configure.in: Add new option --enable-new-malloc to use new
	malloc.  This is the default on Linux.
	* sysdeps/unix/sysv/linux/configure.in: Define malloc to new-malloc
	by default.
	* new-malloc/Makefile: New file.  Improved malloc implementation.
	* new-malloc/malloc.c: Likewise.
	* new-malloc/malloc.h: Likewise.
	* new-malloc/mallocbug.c: Likewise.
	* new-malloc/obstack.c: Likewise.
	* new-malloc/obstack.h: Likewise.
	* new-malloc/thread-m.h: Likewise.
	* time/Makefile: Compile ap.c with NO_MCHECK flag for now.
	* time/ap.c: Don't call mcheck if NO_MCHECK is defined.

	* resolv/Makefile: Add rule to rebuiild libresolv.so when libc.so
	changed.

	* stdio/feof.c: Update copyright.
	* stdio/stdio.h: Add field for lock to FILE structure.
	Add cast to *MAGIC constants to prevent warnings.

	* stdio-common/bug7.c: Correct test.  Stream must not be closed
	twice.

	* stdlib/Makefile (routines): Add secure-getenv.
	* stdlib/secure-getenv.c: New file.  __secure_getenv function
	moved to here from sysdeps/generic/getenv.c.  Otherwise an
	application cannot replace the getenv function in the libc.
	* sysdeps/generic/getenv.c: Remove __secure_getenv function.
	* sysdeps/stub/getenv.c: Remove __secure_getenv alias.

	* sysdeps/mach/libc-lock.h: Define__libc_mutex_lock to __mutex_lock.

	* sysdeps/posix/fdopen.c: Update copyright.  Don't use EXFUN.

	* time/test-tz.c: Comment fifth test out.  PROBLEM.

	* time/tzset.c: De-ANSI-declfy.
	(__tzset): Don't increment pointer tz when no DST information is
	given.

Sat Dec  7 23:47:54 1996  Ulrich Drepper  <drepper@cygnus.com>

	* sysdeps/mach/libc-lock.h [_LIBC]: Add definition of
	__libc_mutex_lock.
	Patch by Thomas Bushnell.

	* sysdeps/unix/sysv/linux/timebits.h: Load <asm/param.h> only
	if __USE_MISC.

	* sysdeps/unix/sysv/linux/Dist: Add llseek.c.

Sat Dec  7 12:18:56 1996  Ulrich Drepper  <drepper@cygnus.com>

	* time/strftime (%c format): Remove %Z from default string.
	Reported by Paul Eggert

	* io/getwd.c: Don't apply getcwd on user supplied buffer.

1 files changed, 67 insertions, 0 deletions

diff --git a/malloc/mallocbug.c b/malloc/mallocbug.c
new file mode 100644
index 0000000000..84a6387954
--- /dev/null
+++ b/malloc/mallocbug.c
@@ -0,0 +1,67 @@
+/* Reproduce a GNU malloc bug.  */
+#include <malloc.h>
+#include <stdio.h>
+#include <string.h>
+
+#define size_t unsigned int
+
+int
+main (int argc, char *argv[])
+{
+  char *dummy0;
+  char *dummy1;
+  char *fill_info_table1;
+  char *over_top;
+  size_t over_top_size = 0x3000;
+  char *over_top_dup;
+  size_t over_top_dup_size = 0x7000;
+  char *x;
+  size_t i;
+
+  /* Here's what memory is supposed to look like (hex):
+        size  contents
+        3000  original_info_table, later fill_info_table1
+      3fa000  dummy0
+      3fa000  dummy1
+        6000  info_table_2
+	3000  over_top
+
+	*/
+  /* mem: original_info_table */
+  dummy0 = malloc (0x3fa000);
+  /* mem: original_info_table, dummy0 */
+  dummy1 = malloc (0x3fa000);
+  /* mem: free, dummy0, dummy1, info_table_2 */
+  fill_info_table1 = malloc (0x3000);
+  /* mem: fill_info_table1, dummy0, dummy1, info_table_2 */
+
+  x = malloc (0x1000);
+  free (x);
+  /* mem: fill_info_table1, dummy0, dummy1, info_table_2, freexx */
+
+  /* This is what loses; info_table_2 and freexx get combined unbeknownst
+     to mmalloc, and mmalloc puts over_top in a section of memory which
+     is on the free list as part of another block (where info_table_2 had
+     been).  */
+  over_top = malloc (over_top_size);
+  over_top_dup = malloc (over_top_dup_size);
+  memset (over_top, 0, over_top_size);
+  memset (over_top_dup, 1, over_top_dup_size);
+
+  for (i = 0; i < over_top_size; ++i)
+    if (over_top[i] != 0)
+      {
+	printf ("FAIL: malloc expands info table\n");
+	return 0;
+      }
+
+  for (i = 0; i < over_top_dup_size; ++i)
+    if (over_top_dup[i] != 1)
+      {
+	printf ("FAIL: malloc expands info table\n");
+	return 0;
+      }
+
+  printf ("PASS: malloc expands info table\n");
+  return 0;
+}