From f17f7e6305993f7fd9e7754b872df21b2d3a4fd0 Mon Sep 17 00:00:00 2001 From: Masatake YAMATO Date: Mon, 30 Apr 2018 06:45:36 +0900 Subject: [PATCH] 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 --- Makefile.am | 2 ++ mmap_notify.c | 54 +++++++++++++++++++++++++++++++++++++++++++++++++++ mmap_notify.h | 40 ++++++++++++++++++++++++++++++++++++++ 3 files changed, 96 insertions(+) create mode 100644 mmap_notify.c create mode 100644 mmap_notify.h diff --git a/Makefile.am b/Makefile.am index 64c0f4a0..e9aa3db1 100644 --- a/Makefile.am +++ b/Makefile.am @@ -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 \ diff --git a/mmap_notify.c b/mmap_notify.c new file mode 100644 index 00000000..034a6d90 --- /dev/null +++ b/mmap_notify.c @@ -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); +} diff --git a/mmap_notify.h b/mmap_notify.h new file mode 100644 index 00000000..8cf44c4e --- /dev/null +++ b/mmap_notify.h @@ -0,0 +1,40 @@ +/* + * 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 */ -- 2.40.0