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https://github.com/jart/cosmopolitan.git
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54 lines
2.8 KiB
C
54 lines
2.8 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
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│ vi: set et 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/syscall-nt.internal.h"
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#include "libc/intrin/maps.h"
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#include "libc/nt/memory.h"
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#include "libc/runtime/runtime.h"
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#include "libc/stdio/sysparam.h"
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#include "libc/sysv/consts/map.h"
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#include "libc/sysv/errfuns.h"
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textwindows int sys_msync_nt(char *addr, size_t size, int flags) {
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size = (size + __pagesize - 1) & -__pagesize;
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if ((uintptr_t)addr & (__pagesize - 1))
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return einval();
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if (__maps_reentrant())
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return edeadlk();
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int rc = 0;
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__maps_lock();
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struct Map *map;
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if (!(map = __maps_floor(addr)))
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map = __maps_first();
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for (; map && map->addr <= addr + size; map = __maps_next(map)) {
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if (map->flags & MAP_ANONYMOUS)
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continue; // msync() is about coherency between file and memory
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char *beg = MAX(addr, map->addr);
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char *end = MIN(addr + size, map->addr + map->size);
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if (beg >= end)
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continue; // didn't overlap mapping
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if (!FlushViewOfFile(beg, end - beg))
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rc = -1;
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// TODO(jart): FlushFileBuffers too on g_fds handle if MS_SYNC?
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}
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__maps_unlock();
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return rc;
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}
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