50 lines
2.4 KiB
C++
50 lines
2.4 KiB
C++
/*
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* Copyright (C) 2013 The Android Open Source Project
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* All rights reserved.
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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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* * 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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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
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* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include "private/bionic_name_mem.h"
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#include <sys/prctl.h>
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// Local definitions of custom prctl arguments to set a vma name in some kernels.
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#define BIONIC_PR_SET_VMA 0x53564d41
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#define BIONIC_PR_SET_VMA_ANON_NAME 0
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// Names a region of memory. The name is expected to show up in /proc/pid/maps
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// and /proc/pid/smaps. There is no guarantee that it will work, and if it
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// does work it is likely to only work on memory that was allocated with
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// mmap(MAP_ANONYMOUS), and only on regions that are page aligned. name should
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// be a pointer to a string that is valid for as long as the memory is mapped,
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// preferably a compile-time constant string.
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//
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// Returns -1 on error and sets errno. If it returns an error naming page
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// aligned anonymous memory the kernel doesn't support naming, and an alternate
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// method of naming memory should be used (like ashmem).
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int __bionic_name_mem(void* addr, size_t len, const char* name) {
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return prctl(BIONIC_PR_SET_VMA, BIONIC_PR_SET_VMA_ANON_NAME, addr, len, name);
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}
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