mirror of
https://github.com/jart/cosmopolitan.git
synced 2025-01-31 19:43:32 +00:00
98909b1391
- Update a couple unicode data files - Disable strace during logger calls - SQLite now uses pread() / pwrite() - pread() past EOF on NT now returns 0 - Make the NT mmap() and fork() code elegant - Give NT a big performance boost with memory - Add many more mmap() tests to prove it works
47 lines
2.7 KiB
C
47 lines
2.7 KiB
C
/*-*- 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 2020 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/assert.h"
|
|
#include "libc/calls/calls.h"
|
|
#include "libc/calls/internal.h"
|
|
#include "libc/calls/strace.internal.h"
|
|
#include "libc/dce.h"
|
|
#include "libc/macros.internal.h"
|
|
#include "libc/sysv/consts/msync.h"
|
|
|
|
/**
|
|
* Synchronize memory mapping changes to disk.
|
|
*
|
|
* Without this, there's no guarantee memory is written back to disk.
|
|
* Particularly on RHEL5, OpenBSD, and Windows NT.
|
|
*
|
|
* @param addr needs to be 4096-byte page aligned
|
|
* @param flags needs MS_ASYNC or MS_SYNC and can have MS_INVALIDATE
|
|
* @return 0 on success or -1 w/ errno
|
|
*/
|
|
int msync(void *addr, size_t size, int flags) {
|
|
int rc;
|
|
assert(((flags & MS_SYNC) ^ (flags & MS_ASYNC)) || !(MS_SYNC && MS_ASYNC));
|
|
if (!IsWindows()) {
|
|
rc = sys_msync(addr, size, flags);
|
|
} else {
|
|
rc = sys_msync_nt(addr, size, flags);
|
|
}
|
|
STRACE("msync(%p, %'zu, %#x) → %d% m", addr, size, flags, rc);
|
|
return rc;
|
|
}
|