51 lines
3.0 KiB
C
51 lines
3.0 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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│ This program is free software; you can redistribute it and/or modify │
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│ it under the terms of the GNU General Public License as published by │
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│ the Free Software Foundation; version 2 of the License. │
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│ │
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│ This program is distributed in the hope that it will be useful, but │
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│ WITHOUT ANY WARRANTY; without even the implied warranty of │
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│ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU │
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│ General Public License for more details. │
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│ │
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│ You should have received a copy of the GNU General Public License │
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│ along with this program; if not, write to the Free Software │
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│ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA │
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│ 02110-1301 USA │
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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.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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* @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 needn't be a
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* multiple of FRAMESIZE, and may be a subset of that which was
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* mapped previously, and may punch holes in existing mappings,
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* but your mileage may vary on windows
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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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size = ROUNDUP(size, FRAMESIZE);
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if (UntrackMemoryIntervals(addr, size) == -1) return -1;
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if (IsWindows()) return 0;
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return munmap$sysv(addr, size);
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}
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