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https://github.com/jart/cosmopolitan.git
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3e4fd4b0ad
This change also pays off some of the remaining technical debt with stdio, file descriptors, and memory managemnt polyfills.
65 lines
3.7 KiB
C
65 lines
3.7 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/nt/enum/fileflagandattributes.h"
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#include "libc/nt/enum/filesharemode.h"
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#include "libc/nt/enum/status.h"
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#include "libc/nt/files.h"
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#include "libc/nt/nt/file.h"
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#include "libc/nt/ntdll.h"
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#include "libc/nt/runtime.h"
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#include "libc/nt/struct/fileaccessinformation.h"
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#include "libc/nt/struct/filebasicinformation.h"
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#include "libc/nt/struct/iostatusblock.h"
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#include "libc/runtime/runtime.h"
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#include "libc/sysv/errfuns.h"
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textwindows int fadvise$nt(int fd, uint64_t offset, uint64_t len, int advice) {
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int64_t h2;
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NtStatus status;
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uint32_t sharemode;
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struct NtIoStatusBlock iostatus;
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struct NtFileBasicInformation basicinfo;
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struct NtFileAccessInformation accessinfo;
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if (!__isfdkind(fd, kFdFile)) return ebadf();
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sharemode = /* xxx: no clue how to query this */
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kNtFileShareRead | kNtFileShareWrite | kNtFileShareDelete;
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/* TODO(jart): can we do it in one call w/ NtQueryObject? */
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if (!NtError(status = NtQueryInformationFile(g_fds.p[fd].handle, &iostatus,
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&basicinfo, sizeof(basicinfo),
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kNtFileBasicInformation)) &&
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!NtError(status = NtQueryInformationFile(g_fds.p[fd].handle, &iostatus,
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&accessinfo, sizeof(accessinfo),
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kNtFileAccessInformation))) {
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if ((h2 = ReOpenFile(g_fds.p[fd].handle, accessinfo.AccessFlags, sharemode,
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advice | basicinfo.FileAttributes)) != -1) {
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if (h2 != g_fds.p[fd].handle) {
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CloseHandle(g_fds.p[fd].handle);
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g_fds.p[fd].handle = h2;
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}
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return 0;
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}
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return __winerr();
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} else if (status == kNtStatusDllNotFound) {
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return enosys();
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} else {
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return ntreturn(status);
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}
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}
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