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mmap_notify: new subsystem for tracking the changes of memory mappings

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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>
This commit is contained in:
Masatake YAMATO 2018-04-30 06:45:36 +09:00 committed by Dmitry V. Levin
parent 2bae5f919c
commit f17f7e6305
3 changed files with 96 additions and 0 deletions
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2
Makefile.am
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@ -192,6 +192,8 @@ strace_SOURCES = \
mknod.c \
mmap_cache.c \
mmap_cache.h \
mmap_notify.c \
mmap_notify.h \
mmsghdr.c \
mount.c \
mpers_type.h \

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

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