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Make improvements for Actually Portable Emacs

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- Get SIGWINCH working again on the New Technology
- Correctly handle O_NOFOLLOW in open() on Windows
- Implement synthetic umask() functionality on Windows
- Do a better job managing file execute access on Windows
- Fill in `st_uid` and `st_gid` with username hash on Windows
- Munge UNICODE control pictures into control codes on Windows
- Do a better job ensuring Windows console settings are restored
- Introduce KPRINTF_LOG environment variable to log kprintf to a file
This commit is contained in:
Justine Tunney 2023-08-19 06:41:06 -07:00
parent 9c7b81ee0f
commit 965516e313
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GPG key ID: BE714B4575D6E328
108 changed files with 1126 additions and 807 deletions
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48
libc/intrin/createfile.c
View file

@ -21,6 +21,8 @@
#include "libc/calls/syscall_support-nt.internal.h"
#include "libc/intrin/describeflags.internal.h"
#include "libc/intrin/strace.internal.h"
#include "libc/nt/enum/accessmask.h"
#include "libc/nt/enum/creationdisposition.h"
#include "libc/nt/errors.h"
#include "libc/nt/runtime.h"
#include "libc/nt/synchronization.h"
@ -33,30 +35,50 @@ __msabi extern typeof(Sleep) *const __imp_Sleep;
/**
* Opens file on the New Technology.
*
* @return handle, or -1 on failure
* @return handle, or -1 on failure w/ `errno` set appropriately
* @note this wrapper takes care of ABI, STRACE(), and __winerr()
*/
textwindows int64_t CreateFile(
const char16_t *lpFileName, uint32_t dwDesiredAccess, uint32_t dwShareMode,
struct NtSecurityAttributes *opt_lpSecurityAttributes,
int dwCreationDisposition, uint32_t dwFlagsAndAttributes,
int64_t opt_hTemplateFile) {
textwindows int64_t CreateFile(const char16_t *lpFileName, //
uint32_t dwDesiredAccess, //
uint32_t dwShareMode, //
struct NtSecurityAttributes *opt_lpSecurity, //
int dwCreationDisposition, //
uint32_t dwFlagsAndAttributes, //
int64_t opt_hTemplateFile) {
int64_t hHandle;
uint32_t micros = 1;
TryAgain:
hHandle = __imp_CreateFileW(lpFileName, dwDesiredAccess, dwShareMode,
opt_lpSecurityAttributes, dwCreationDisposition,
opt_lpSecurity, dwCreationDisposition,
dwFlagsAndAttributes, opt_hTemplateFile);
if (hHandle == -1 && __imp_GetLastError() == kNtErrorPipeBusy) {
if (micros >= 1024) __imp_Sleep(micros / 1024);
if (micros / 1024 < __SIG_POLLING_INTERVAL_MS) micros <<= 1;
goto TryAgain;
if (hHandle == -1) {
switch (__imp_GetLastError()) {
case kNtErrorPipeBusy:
if (micros >= 1024) __imp_Sleep(micros / 1024);
if (micros / 1024 < __SIG_POLLING_INTERVAL_MS) micros <<= 1;
goto TryAgain;
case kNtErrorAccessDenied:
// GetNtOpenFlags() always greedily requests execute permissions
// because the POSIX flag O_EXEC doesn't mean the same thing. It
// seems however this causes the opening of certain files to not
// work, possibly due to Windows Defender or some security thing
// In that case, we'll cross our fingers the file isn't a binary
if ((dwDesiredAccess & kNtGenericExecute) &&
(dwCreationDisposition == kNtOpenExisting ||
dwCreationDisposition == kNtTruncateExisting)) {
dwDesiredAccess &= ~kNtGenericExecute;
goto TryAgain;
}
break;
default:
break;
}
__winerr();
}
if (hHandle == -1) __winerr();
NTTRACE("CreateFile(%#hs, %s, %s, %s, %s, %s, %ld) → %ld% m", lpFileName,
DescribeNtFileAccessFlags(dwDesiredAccess),
DescribeNtFileShareFlags(dwShareMode),
DescribeNtSecurityAttributes(opt_lpSecurityAttributes),
DescribeNtSecurityAttributes(opt_lpSecurity),
DescribeNtCreationDisposition(dwCreationDisposition),
DescribeNtFileFlagAttr(dwFlagsAndAttributes), opt_hTemplateFile,
hHandle);