cosmopolitan/libc/calls/open-nt.c

125 lines
6.0 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 │
│ │
│ This program is free software; you can redistribute it and/or modify │
│ it under the terms of the GNU General Public License as published by │
│ the Free Software Foundation; version 2 of the License. │
│ │
│ This program is distributed in the hope that it will be useful, but │
│ WITHOUT ANY WARRANTY; without even the implied warranty of │
│ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU │
│ General Public License for more details. │
│ │
│ You should have received a copy of the GNU General Public License │
│ along with this program; if not, write to the Free Software │
│ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA │
│ 02110-1301 USA │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/assert.h"
#include "libc/calls/internal.h"
#include "libc/calls/ntmagicpaths.h"
#include "libc/nexgen32e/tinystrcmp.h"
#include "libc/nt/createfile.h"
#include "libc/nt/enum/filesharemode.h"
#include "libc/nt/enum/filetype.h"
#include "libc/nt/enum/fsctl.h"
#include "libc/nt/errors.h"
#include "libc/nt/files.h"
#include "libc/nt/runtime.h"
#include "libc/sysv/consts/fileno.h"
#include "libc/sysv/consts/o.h"
#include "libc/sysv/errfuns.h"
static textwindows int64_t open$nt$impl(const char *file, uint32_t flags,
int32_t mode) {
uint32_t br;
int64_t handle;
char16_t file16[PATH_MAX];
if (mkntpath2(file, flags, file16) == -1) return -1;
if ((handle = CreateFile(
file16,
(flags & 0xf000000f) | (/* this is needed if we mmap(rwx+cow)
nt is choosy about open() access */
kNtGenericExecute | kNtFileGenericWrite),
(flags & O_EXCL)
? kNtFileShareExclusive
: kNtFileShareRead | kNtFileShareWrite | kNtFileShareDelete,
(flags & O_CLOEXEC) ? &kNtIsInheritable : NULL,
(flags & O_CREAT) && (flags & O_EXCL)
? kNtCreateNew
: (flags & O_CREAT) && (flags & O_TRUNC)
? kNtCreateAlways
: (flags & O_CREAT)
? kNtOpenAlways
: (flags & O_TRUNC) ? kNtTruncateExisting
: kNtOpenExisting,
/* TODO(jart): Should we just always set overlapped? */
(/* note: content indexer demolishes unix-ey i/o performance */
kNtFileAttributeNotContentIndexed | kNtFileAttributeNormal |
(((flags & ((kNtFileFlagWriteThrough | kNtFileFlagOverlapped |
kNtFileFlagNoBuffering | kNtFileFlagRandomAccess) >>
8))
<< 8) |
(flags & (kNtFileFlagSequentialScan | kNtFileFlagDeleteOnClose |
kNtFileFlagBackupSemantics | kNtFileFlagPosixSemantics |
kNtFileAttributeTemporary)))),
0)) != -1) {
if (flags & O_SPARSE) {
/*
* TODO(jart): Can all files be sparse files? That seems to be the
* way Linux behaves out of the box.
* TODO(jart): Wow why does sparse wreak havoc?
*/
DeviceIoControl(handle, kNtFsctlSetSparse, NULL, 0, NULL, 0, &br, NULL);
}
}
return handle;
}
static textwindows ssize_t open$nt$console(const struct NtMagicPaths *mp,
uint32_t flags, int32_t mode,
size_t fd) {
if (GetFileType(g_fds.p[STDIN_FILENO].handle) == kNtFileTypeChar &&
GetFileType(g_fds.p[STDOUT_FILENO].handle) == kNtFileTypeChar) {
g_fds.p[fd].handle = g_fds.p[STDIN_FILENO].handle;
g_fds.p[fd].extra = g_fds.p[STDOUT_FILENO].handle;
} else if ((g_fds.p[fd].handle = open$nt$impl(
mp->conin, (flags & ~O_ACCMODE) | O_RDONLY, mode)) != -1) {
g_fds.p[fd].extra =
open$nt$impl(mp->conout, (flags & ~O_ACCMODE) | O_WRONLY, mode);
assert(g_fds.p[fd].extra != -1);
} else {
return winerr();
}
g_fds.p[fd].kind = kFdConsole;
g_fds.p[fd].flags = flags;
return fd;
}
static textwindows ssize_t open$nt$file(const char *file, uint32_t flags,
int32_t mode, size_t fd) {
if ((g_fds.p[fd].handle = open$nt$impl(file, flags, mode)) != -1) {
g_fds.p[fd].kind = kFdFile;
g_fds.p[fd].flags = flags;
return fd;
} else if (GetLastError() == kNtErrorFileExists &&
((flags & O_CREAT) && (flags & O_TRUNC))) {
return eisdir();
} else {
return winerr();
}
}
textwindows ssize_t open$nt(const char *file, uint32_t flags, int32_t mode) {
size_t fd;
if ((fd = createfd()) == -1) return -1;
if ((flags & O_ACCMODE) == O_RDWR &&
tinystrcmp(file, kNtMagicPaths.devtty) == 0) {
return open$nt$console(&kNtMagicPaths, flags, mode, fd);
} else {
return open$nt$file(file, flags, mode, fd);
}
}