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mmap_notify: new subsystem for tracking the changes of memory mappings

This subsystem is a spin-off of the mmap_cache subsystem.

The mmap_cache subsystem had two features: (1) tracking the change
of memory mapping, and (2) maintaining the cache of memory mapping.

mmap_notify is a subsystem specialized to provide feature (2).
unwind-libdw itself has the feature (1).  It needs only (2).

* mmap_notify.h: New file.
* mmap_notify.c: Likewise.
* Makefile.am (strace_SOURCES): Add them.

Signed-off-by: Masatake YAMATO <yamato@redhat.com>
Masatake YAMATO 1 year ago
parent
commit
f17f7e6305
3 changed files with 96 additions and 0 deletions
  1. 2
    0
      Makefile.am
  2. 54
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      mmap_notify.c
  3. 40
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      mmap_notify.h

+ 2
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Makefile.am View File

@@ -192,6 +192,8 @@ strace_SOURCES =	\
192 192
 	mknod.c		\
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 	mmap_cache.c	\
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 	mmap_cache.h	\
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+	mmap_notify.c	\
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+	mmap_notify.h	\
195 197
 	mmsghdr.c	\
196 198
 	mount.c		\
197 199
 	mpers_type.h	\

+ 54
- 0
mmap_notify.c View File

@@ -0,0 +1,54 @@
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+/*
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+ * Copyright (c) 2018 The strace developers.
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+ *
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+ * Redistribution and use in source and binary forms, with or without
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+ * modification, are permitted provided that the following conditions
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+ * are met:
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+ * 1. Redistributions of source code must retain the above copyright
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+ *    notice, this list of conditions and the following disclaimer.
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+ * 2. Redistributions in binary form must reproduce the above copyright
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+ *    notice, this list of conditions and the following disclaimer in the
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+ *    documentation and/or other materials provided with the distribution.
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+ * 3. The name of the author may not be used to endorse or promote products
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+ *    derived from this software without specific prior written permission.
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+ *
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+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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+ */
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+
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+#include "mmap_notify.h"
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+
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+struct mmap_notify_client {
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+	mmap_notify_fn fn;
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+	void *data;
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+	struct mmap_notify_client *next;
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+};
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+
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+static struct mmap_notify_client *clients;
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+
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+void
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+mmap_notify_register_client(mmap_notify_fn fn, void *data)
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+{
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+	struct mmap_notify_client *client = xmalloc(sizeof(*client));
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+	client->fn = fn;
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+	client->data = data;
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+	client->next = clients;
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+	clients = client;
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+}
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+
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+void
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+mmap_notify_report(struct tcb *tcp)
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+{
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+	struct mmap_notify_client *client;
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+
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+	for (client = clients; client; client = client->next)
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+		client->fn(tcp, client->data);
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+}

+ 40
- 0
mmap_notify.h View File

@@ -0,0 +1,40 @@
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+/*
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+ * Copyright (c) 2018 The strace developers.
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+ *
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+ * Redistribution and use in source and binary forms, with or without
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+ * modification, are permitted provided that the following conditions
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+ * are met:
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+ * 1. Redistributions of source code must retain the above copyright
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+ *    notice, this list of conditions and the following disclaimer.
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+ * 2. Redistributions in binary form must reproduce the above copyright
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+ *    notice, this list of conditions and the following disclaimer in the
11
+ *    documentation and/or other materials provided with the distribution.
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+ * 3. The name of the author may not be used to endorse or promote products
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+ *    derived from this software without specific prior written permission.
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+ *
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+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
19
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
20
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
21
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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+ */
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+
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+#ifndef STRACE_MMAP_NOTIFY_H
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+#define STRACE_MMAP_NOTIFY_H
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+
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+#include "defs.h"
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+
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+typedef void (*mmap_notify_fn)(struct tcb *, void *);
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+
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+extern void
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+mmap_notify_register_client(mmap_notify_fn, void *);
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+
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+extern void
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+mmap_notify_report (struct tcb *);
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+
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+#endif /* !STRACE_MMAP_NOTIFY_H */

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