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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 15:49:25 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 15:49:25 +0000
commit464df1d5e5ab1322e2dd0a7796939fff1aeefa9a (patch)
tree6a403684e0978f0287d7f0ec0e5aab1fd31a59e1 /e2fsck/mtrace.c
parentInitial commit. (diff)
downloade2fsprogs-464df1d5e5ab1322e2dd0a7796939fff1aeefa9a.tar.xz
e2fsprogs-464df1d5e5ab1322e2dd0a7796939fff1aeefa9a.zip
Adding upstream version 1.47.0.upstream/1.47.0upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'e2fsck/mtrace.c')
-rw-r--r--e2fsck/mtrace.c160
1 files changed, 160 insertions, 0 deletions
diff --git a/e2fsck/mtrace.c b/e2fsck/mtrace.c
new file mode 100644
index 0000000..2b7b34a
--- /dev/null
+++ b/e2fsck/mtrace.c
@@ -0,0 +1,160 @@
+/* More debugging hooks for `malloc'.
+ Copyright (C) 1991, 1992 Free Software Foundation, Inc.
+ Written April 2, 1991 by John Gilmore of Cygnus Support.
+ Based on mcheck.c by Mike Haertel.
+
+This library is free software; you can redistribute it and/or
+modify it under the terms of the GNU Library General Public License as
+published by the Free Software Foundation; either version 2 of the
+License, or (at your option) any later version.
+
+This library is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+Library General Public License for more details.
+
+You should have received a copy of the GNU Library General Public
+License along with this library; see the file COPYING.LIB. If
+not, write to the Free Software Foundation, Inc., 675 Mass Ave,
+Cambridge, MA 02139, USA.
+
+ The author may be reached (Email) at the address mike@ai.mit.edu,
+ or (US mail) as Mike Haertel c/o Free Software Foundation. */
+
+#include "config.h"
+
+#ifndef _MALLOC_INTERNAL
+#define _MALLOC_INTERNAL
+#include "./mtrace.h"
+#endif
+
+#include <stdio.h>
+
+#ifndef __GNU_LIBRARY__
+extern char *getenv ();
+#else
+#include <stdlib.h>
+#endif
+
+static FILE *mallstream;
+static char mallenv[]= "MALLOC_TRACE";
+static char mallbuf[BUFSIZ]; /* Buffer for the output. */
+
+/* Address to breakpoint on accesses to... */
+__ptr_t mallwatch;
+
+/* Old hook values. */
+static void (*tr_old_free_hook) __P ((__ptr_t ptr));
+static __ptr_t (*tr_old_malloc_hook) __P ((size_t size));
+static __ptr_t (*tr_old_realloc_hook) __P ((__ptr_t ptr, size_t size));
+
+/*
+ * Added by TYT, 10/10/93 --- so that we can print
+ */
+FILE *malloc_get_mallstream()
+{
+ return mallstream;
+}
+
+/* This function is called when the block being alloc'd, realloc'd, or
+ freed has an address matching the variable "mallwatch". In a debugger,
+ set "mallwatch" to the address of interest, then put a breakpoint on
+ tr_break. */
+
+void tr_break __P ((void));
+void
+tr_break ()
+{
+}
+
+static void tr_freehook __P ((__ptr_t));
+static void
+tr_freehook (ptr)
+ __ptr_t ptr;
+{
+ fprintf (mallstream, "- %p\n", ptr); /* Be sure to print it first. */
+ if (ptr == mallwatch)
+ tr_break ();
+ __free_hook = tr_old_free_hook;
+ free (ptr);
+ __free_hook = tr_freehook;
+}
+
+static __ptr_t tr_mallochook __P ((size_t));
+static __ptr_t
+tr_mallochook (size)
+ size_t size;
+{
+ __ptr_t hdr;
+
+ __malloc_hook = tr_old_malloc_hook;
+ hdr = (__ptr_t) malloc (size);
+ __malloc_hook = tr_mallochook;
+
+ /* We could be printing a NULL here; that's OK. */
+ fprintf (mallstream, "+ %p %d\n", hdr, size);
+
+ if (hdr == mallwatch)
+ tr_break ();
+
+ return hdr;
+}
+
+static __ptr_t tr_reallochook __P ((__ptr_t, size_t));
+static __ptr_t
+tr_reallochook (ptr, size)
+ __ptr_t ptr;
+ size_t size;
+{
+ __ptr_t hdr;
+
+ if (ptr == mallwatch)
+ tr_break ();
+
+ __free_hook = tr_old_free_hook;
+ __malloc_hook = tr_old_malloc_hook;
+ __realloc_hook = tr_old_realloc_hook;
+ hdr = (__ptr_t) realloc (ptr, size);
+ __free_hook = tr_freehook;
+ __malloc_hook = tr_mallochook;
+ __realloc_hook = tr_reallochook;
+ if (hdr == NULL)
+ /* Failed realloc. */
+ fprintf (mallstream, "! %p %d\n", ptr, size);
+ else
+ fprintf (mallstream, "< %p\n> %p %d\n", ptr, hdr, size);
+
+ if (hdr == mallwatch)
+ tr_break ();
+
+ return hdr;
+}
+
+/* We enable tracing if either the environment variable MALLOC_TRACE
+ is set, or if the variable mallwatch has been patched to an address
+ that the debugging user wants us to stop on. When patching mallwatch,
+ don't forget to set a breakpoint on tr_break! */
+
+void
+mtrace ()
+{
+ char *mallfile;
+
+ mallfile = getenv (mallenv);
+ if (mallfile != NULL || mallwatch != NULL)
+ {
+ mallstream = fopen (mallfile != NULL ? mallfile : "/dev/null", "w");
+ if (mallstream != NULL)
+ {
+ /* Be sure it doesn't malloc its buffer! */
+ setbuf (mallstream, mallbuf);
+ fprintf (mallstream, "= Start\n");
+ tr_old_free_hook = __free_hook;
+ __free_hook = tr_freehook;
+ tr_old_malloc_hook = __malloc_hook;
+ __malloc_hook = tr_mallochook;
+ tr_old_realloc_hook = __realloc_hook;
+ __realloc_hook = tr_reallochook;
+ }
+ }
+}