cosmopolitan/libc/calls/setfl.c
Jōshin e16a7d8f3b
flip et / noet in modelines
`et` means `expandtab`.

```sh
rg 'vi: .* :vi' -l -0 | \
  xargs -0 sed -i '' 's/vi: \(.*\) et\(.*\)  :vi/vi: \1 xoet\2:vi/'
rg 'vi: .*  :vi' -l -0 | \
  xargs -0 sed -i '' 's/vi: \(.*\)noet\(.*\):vi/vi: \1et\2  :vi/'
rg 'vi: .*  :vi' -l -0 | \
  xargs -0 sed -i '' 's/vi: \(.*\)xoet\(.*\):vi/vi: \1noet\2:vi/'
```
2023-12-07 22:17:11 -05:00

74 lines
3.8 KiB
C

/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
│ vi: set et 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/createfileflags.internal.h"
#include "libc/calls/internal.h"
#include "libc/calls/struct/fd.internal.h"
#include "libc/calls/syscall_support-nt.internal.h"
#include "libc/nt/createfile.h"
#include "libc/nt/enum/fileflagandattributes.h"
#include "libc/nt/files.h"
#include "libc/nt/runtime.h"
#include "libc/sysv/consts/o.h"
textwindows int sys_fcntl_nt_setfl(int fd, unsigned flags) {
// you may change the following:
//
// - O_NONBLOCK make read() raise EAGAIN
// - O_APPEND for toggling append mode
// - O_RANDOM alt. for posix_fadvise()
// - O_SEQUENTIAL alt. for posix_fadvise()
// - O_DIRECT works but haven't tested
//
// the other bits are ignored.
unsigned allowed =
_O_APPEND | _O_SEQUENTIAL | _O_RANDOM | _O_DIRECT | _O_NONBLOCK;
unsigned needreo = _O_APPEND | _O_SEQUENTIAL | _O_RANDOM | _O_DIRECT;
unsigned newflag = (g_fds.p[fd].flags & ~allowed) | (flags & allowed);
if (g_fds.p[fd].kind == kFdFile &&
((g_fds.p[fd].flags & needreo) ^ (flags & needreo))) {
unsigned perm, share, attr;
if (GetNtOpenFlags(newflag, g_fds.p[fd].mode, &perm, &share, 0, &attr) ==
-1) {
return -1;
}
// MSDN says only these are allowed, otherwise it returns EINVAL.
attr &= kNtFileFlagBackupSemantics | kNtFileFlagDeleteOnClose |
kNtFileFlagNoBuffering | kNtFileFlagOpenNoRecall |
kNtFileFlagOpenReparsePoint | kNtFileFlagOverlapped |
kNtFileFlagPosixSemantics | kNtFileFlagRandomAccess |
kNtFileFlagSequentialScan | kNtFileFlagWriteThrough;
intptr_t hand;
if ((hand = ReOpenFile(g_fds.p[fd].handle, perm, share, attr)) != -1) {
if (hand != g_fds.p[fd].handle) {
CloseHandle(g_fds.p[fd].handle);
g_fds.p[fd].handle = hand;
}
} else {
return __winerr();
}
}
// 1. ignore flags that aren't access mode flags
// 2. return zero if nothing's changed
g_fds.p[fd].flags = newflag;
return 0;
}