39 lines
2.4 KiB
C
39 lines
2.4 KiB
C
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/*-*- 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/bits/bits.h"
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#include "libc/bits/pushpop.h"
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#include "libc/calls/calls.h"
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#include "libc/runtime/mappings.h"
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#include "libc/runtime/runtime.h"
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/**
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* Closes memory mapping, the Cosmopolitan way.
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*
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* The caller's address holder is set to MAP_FAILED (-1) which is a
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* no-op for subsequent invocations.
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*
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* @return 0 on success, or -1 w/ errno
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*/
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int munmap_s(void *addrp, uint64_t size) {
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void **addrpp = (void **)addrp;
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void *addr = (void *)pushpop(-1L);
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return munmap(lockxchg(addrpp, &addr), size);
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}
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