mirror of
https://github.com/jart/cosmopolitan.git
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94 lines
4.8 KiB
C
94 lines
4.8 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 2022 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/nt/createfile.h"
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#include "libc/calls/sig.internal.h"
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#include "libc/calls/syscall_support-nt.internal.h"
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#include "libc/intrin/describeflags.h"
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#include "libc/intrin/strace.h"
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#include "libc/nt/enum/accessmask.h"
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#include "libc/nt/enum/creationdisposition.h"
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#include "libc/nt/errors.h"
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#include "libc/nt/runtime.h"
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#include "libc/nt/synchronization.h"
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#include "libc/nt/thunk/msabi.h"
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__msabi extern typeof(CreateFile) *const __imp_CreateFileW;
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__msabi extern typeof(GetLastError) *const __imp_GetLastError;
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__msabi extern typeof(Sleep) *const __imp_Sleep;
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/**
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* Opens file on the New Technology.
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*
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* @return handle, or -1 on failure w/ `errno` set appropriately
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* @note this wrapper takes care of ABI, STRACE(), and __winerr()
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*/
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textwindows int64_t
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CreateFile(const char16_t *lpFileName, //
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uint32_t dwDesiredAccess, //
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uint32_t dwShareMode, //
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const struct NtSecurityAttributes *opt_lpSecurity, //
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int dwCreationDisposition, //
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uint32_t dwFlagsAndAttributes, //
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int64_t opt_hTemplateFile) {
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int64_t hHandle;
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uint32_t micros = 1;
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char buf_accessflags[512];
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char buf_shareflags[64];
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char buf_secattr[32];
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char buf_flagattr[256];
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TryAgain:
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hHandle = __imp_CreateFileW(lpFileName, dwDesiredAccess, dwShareMode,
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opt_lpSecurity, dwCreationDisposition,
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dwFlagsAndAttributes, opt_hTemplateFile);
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NTTRACE("CreateFile(%#hs, %s, %s, %s, %s, %s, %ld) → {%ld, %d}", lpFileName,
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(DescribeNtFileAccessFlags)(buf_accessflags, dwDesiredAccess),
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(DescribeNtFileShareFlags)(buf_shareflags, dwShareMode),
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(DescribeNtSecurityAttributes)(buf_secattr, opt_lpSecurity),
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DescribeNtCreationDisposition(dwCreationDisposition),
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(DescribeNtFileFlagAttr)(buf_flagattr, dwFlagsAndAttributes),
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opt_hTemplateFile, hHandle, __imp_GetLastError());
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if (hHandle == -1) {
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switch (__imp_GetLastError()) {
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case kNtErrorPipeBusy:
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if (micros >= 1024)
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__imp_Sleep(micros / 1024);
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if (micros < 1024 * 1024)
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micros <<= 1;
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goto TryAgain;
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case kNtErrorAccessDenied:
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// GetNtOpenFlags() always greedily requests execute permissions
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// because the POSIX flag O_EXEC doesn't mean the same thing. It
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// seems however this causes the opening of certain files to not
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// work, possibly due to Windows Defender or some security thing
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// In that case, we'll cross our fingers the file isn't a binary
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if ((dwDesiredAccess & kNtGenericExecute) &&
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(dwCreationDisposition == kNtOpenExisting ||
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dwCreationDisposition == kNtTruncateExisting)) {
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NTTRACE("CreateFile removed kNtGenericExecute");
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dwDesiredAccess &= ~kNtGenericExecute;
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goto TryAgain;
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}
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break;
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default:
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break;
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}
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__winerr();
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}
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return hHandle;
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}
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