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52 lines
3 KiB
C
52 lines
3 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
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│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
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╞══════════════════════════════════════════════════════════════════════════════╡
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│ Copyright 2020 Justine Alexandra Roberts Tunney │
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│ │
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│ Permission to use, copy, modify, and/or distribute this software for │
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│ any purpose with or without fee is hereby granted, provided that the │
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│ above copyright notice and this permission notice appear in all copies. │
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│ │
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│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
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│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
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│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
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│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
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│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
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│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
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│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
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│ PERFORMANCE OF THIS SOFTWARE. │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "libc/calls/internal.h"
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#include "libc/dce.h"
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#include "libc/macros.internal.h"
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#include "libc/runtime/directmap.internal.h"
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#include "libc/runtime/memtrack.h"
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#include "libc/runtime/runtime.h"
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#include "libc/sysv/errfuns.h"
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#define IP(X) (intptr_t)(X)
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#define ALIGNED(p) (!(IP(p) & (FRAMESIZE - 1)))
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#define CANONICAL(p) (-0x800000000000 <= IP(p) && IP(p) <= 0x7fffffffffff)
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/**
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* Releases memory pages.
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*
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* This function may be used to punch holes in existing mappings, but your
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* mileage may vary on Windows.
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*
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* @param addr is a pointer within any memory mapped region the process
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* has permission to control, such as address ranges returned by
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* mmap(), the program image itself, etc.
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* @param size is the amount of memory to unmap, which needs to be a
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* multiple of FRAMESIZE for anonymous mappings, because windows
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* and for files size needs to be perfect to the byte bc openbsd
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* @return 0 on success, or -1 w/ errno
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*/
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int munmap(void *addr, size_t size) {
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int rc;
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if (!ALIGNED(addr) || !CANONICAL(addr) || !size) return einval();
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if (UntrackMemoryIntervals(addr, size) == -1) return -1;
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if (IsWindows()) return 0;
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if (IsMetal()) sys_munmap_metal(addr, size);
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return sys_munmap(addr, size);
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}
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