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Add mlock() and munlock()

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Justine Tunney 2023-04-27 10:42:52 -07:00
parent 7c9ef924bf
commit fec139f423
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8 changed files with 115 additions and 2 deletions
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libc/calls/mlock.c Normal file
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/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
╞══════════════════════════════════════════════════════════════════════════════╡
│ Copyright 2023 Justine Alexandra Roberts Tunney │
│ │
│ Permission to use, copy, modify, and/or distribute this software for │
│ any purpose with or without fee is hereby granted, provided that the │
│ above copyright notice and this permission notice appear in all copies. │
│ │
│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
│ PERFORMANCE OF THIS SOFTWARE. │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/calls/calls.h"
#include "libc/calls/syscall_support-nt.internal.h"
#include "libc/dce.h"
#include "libc/nt/memory.h"
#include "libc/runtime/runtime.h"
static textwindows int sys_mlock_nt(const void *addr, size_t len) {
if (VirtualLock(addr, len)) {
return 0;
} else {
return __winerr();
}
}
/**
* Locks virtual memory interval into RAM, preventing it from swapping.
*
* @return 0 on success, or -1 w/ errno
*/
int mlock(const void *addr, size_t len) {
if (!IsWindows()) {
return sys_mlock(addr, len);
} else {
return sys_mlock_nt(addr, len);
}
}