mirror of
https://github.com/jart/cosmopolitan.git
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59 lines
2.9 KiB
C
59 lines
2.9 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 2023 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/internal.h"
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#include "libc/intrin/fds.h"
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#include "libc/calls/syscall-nt.internal.h"
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#include "libc/calls/syscall_support-nt.internal.h"
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#include "libc/nt/enum/fileflagandattributes.h"
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#include "libc/nt/enum/fileinfobyhandleclass.h"
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#include "libc/nt/files.h"
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#include "libc/nt/struct/filebasicinfo.h"
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#include "libc/sysv/errfuns.h"
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textwindows int sys_fchmod_nt(int fd, uint32_t mode) {
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// validate file descriptor
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if (fd + 0u >= g_fds.n)
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return ebadf();
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if (g_fds.p[fd].kind == kFdEmpty)
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return ebadf();
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// get current information
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struct NtFileBasicInfo fbi;
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if (!GetFileInformationByHandleEx(g_fds.p[fd].handle, kNtFileBasicInfo, &fbi,
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sizeof(fbi))) {
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return __winerr();
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}
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// change attributes
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if (mode & 0222) {
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fbi.FileAttributes &= ~kNtFileAttributeReadonly;
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} else {
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fbi.FileAttributes |= kNtFileAttributeReadonly;
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}
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// set new attributes
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if (!SetFileInformationByHandle(g_fds.p[fd].handle, kNtFileBasicInfo, &fbi,
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sizeof(fbi))) {
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return __winerr();
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}
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// all good
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return 0;
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}
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