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cosmopolitan/libc/nt/files.h
Justine Tunney ec480f5aa0
Make improvements 
- Every unit test now passes on Apple Silicon. The final piece of this
  puzzle was porting our POSIX threads cancelation support, since that
  works differently on ARM64 XNU vs. AMD64. Our semaphore support on
  Apple Silicon is also superior now compared to AMD64, thanks to the
  grand central dispatch library which lets *NSYNC locks go faster.

- The Cosmopolitan runtime is now more stable, particularly on Windows.
  To do this, thread local storage is mandatory at all runtime levels,
  and the innermost packages of the C library is no longer being built
  using ASAN. TLS is being bootstrapped with a 128-byte TIB during the
  process startup phase, and then later on the runtime re-allocates it
  either statically or dynamically to support code using _Thread_local.
  fork() and execve() now do a better job cooperating with threads. We
  can now check how much stack memory is left in the process or thread
  when functions like kprintf() / execve() etc. call alloca(), so that
  ENOMEM can be raised, reduce a buffer size, or just print a warning.

- POSIX signal emulation is now implemented the same way kernels do it
  with pthread_kill() and raise(). Any thread can interrupt any other
  thread, regardless of what it's doing. If it's blocked on read/write
  then the killer thread will cancel its i/o operation so that EINTR can
  be returned in the mark thread immediately. If it's doing a tight CPU
  bound operation, then that's also interrupted by the signal delivery.
  Signal delivery works now by suspending a thread and pushing context
  data structures onto its stack, and redirecting its execution to a
  trampoline function, which calls SetThreadContext(GetCurrentThread())
  when it's done.

- We're now doing a better job managing locks and handles. On NetBSD we
  now close semaphore file descriptors in forked children. Semaphores on
  Windows can now be canceled immediately, which means mutexes/condition
  variables will now go faster. Apple Silicon semaphores can be canceled
  too. We're now using Apple's pthread_yield() funciton. Apple _nocancel
  syscalls are now used on XNU when appropriate to ensure pthread_cancel
  requests aren't lost. The MbedTLS library has been updated to support
  POSIX thread cancelations. See tool/build/runitd.c for an example of
  how it can be used for production multi-threaded tls servers. Handles
  on Windows now leak less often across processes. All i/o operations on
  Windows are now overlapped, which means file pointers can no longer be
  inherited across dup() and fork() for the time being.

- We now spawn a thread on Windows to deliver SIGCHLD and wakeup wait4()
  which means, for example, that posix_spawn() now goes 3x faster. POSIX
  spawn is also now more correct. Like Musl, it's now able to report the
  failure code of execve() via a pipe although our approach favors using
  shared memory to do that on systems that have a true vfork() function.

- We now spawn a thread to deliver SIGALRM to threads when setitimer()
  is used. This enables the most precise wakeups the OS makes possible.

- The Cosmopolitan runtime now uses less memory. On NetBSD for example,
  it turned out the kernel would actually commit the PT_GNU_STACK size
  which caused RSS to be 6mb for every process. Now it's down to ~4kb.
  On Apple Silicon, we reduce the mandatory upstream thread size to the
  smallest possible size to reduce the memory overhead of Cosmo threads.
  The examples directory has a program called greenbean which can spawn
  a web server on Linux with 10,000 worker threads and have the memory
  usage of the process be ~77mb. The 1024 byte overhead of POSIX-style
  thread-local storage is now optional; it won't be allocated until the
  pthread_setspecific/getspecific functions are called. On Windows, the
  threads that get spawned which are internal to the libc implementation
  use reserve rather than commit memory, which shaves a few hundred kb.

- sigaltstack() is now supported on Windows, however it's currently not
  able to be used to handle stack overflows, since crash signals are
  still generated by WIN32. However the crash handler will still switch
  to the alt stack, which is helpful in environments with tiny threads.

- Test binaries are now smaller. Many of the mandatory dependencies of
  the test runner have been removed. This ensures many programs can do a
  better job only linking the the thing they're testing. This caused the
  test binaries for LIBC_FMT for example, to decrease from 200kb to 50kb

- long double is no longer used in the implementation details of libc,
  except in the APIs that define it. The old code that used long double
  for time (instead of struct timespec) has now been thoroughly removed.

- ShowCrashReports() is now much tinier in MODE=tiny. Instead of doing
  backtraces itself, it'll just print a command you can run on the shell
  using our new `cosmoaddr2line` program to view the backtrace.

- Crash report signal handling now works in a much better way. Instead
  of terminating the process, it now relies on SA_RESETHAND so that the
  default SIG_IGN behavior can terminate the process if necessary.

- Our pledge() functionality has now been fully ported to AARCH64 Linux.
2023-09-18 21:04:47 -07:00

234 lines
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#ifndef COSMOPOLITAN_LIBC_NT_FILES_H_
#define COSMOPOLITAN_LIBC_NT_FILES_H_
#include "libc/nt/struct/byhandlefileinformation.h"
#include "libc/nt/struct/filesegmentelement.h"
#include "libc/nt/struct/filetime.h"
#include "libc/nt/struct/genericmapping.h"
#include "libc/nt/struct/objectattributes.h"
#include "libc/nt/struct/overlapped.h"
#include "libc/nt/struct/privilegeset.h"
#include "libc/nt/struct/securityattributes.h"
#include "libc/nt/struct/win32finddata.h"
#include "libc/nt/thunk/msabi.h"
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╔────────────────────────────────────────────────────────────────▀▀▀─────────│─╗
│ cosmopolitan § new technology » files ─╬─│┼
╚────────────────────────────────────────────────────────────────────────────│*/
#define kNtHandleFlagInherit 1 /* SetHandleInformation */
#define kNtHandleFlagProtectFromClose 2
#define kNtFindFirstExCaseSensitive 1
#define kNtFindFirstExLargeFetch 2
#define kNtDuplicateCloseSource 1
#define kNtDuplicateSameAccess 2
#if !(__ASSEMBLER__ + __LINKER__ + 0)
COSMOPOLITAN_C_START_
intptr_t LoadResource(int64_t hModule, int64_t hResInfo);
uint32_t SetHandleCount(uint32_t uNumber);
uint32_t GetLogicalDrives(void);
bool32 FlushFileBuffers(int64_t hFile);
int64_t ReOpenFile(int64_t hOriginalFile, uint32_t dwDesiredAccess,
uint32_t dwShareMode, uint32_t dwFlagsAndAttributes);
bool32 DeleteFile(const char16_t *lpFileName) paramsnonnull();
bool32 CopyFile(const char16_t *lpExistingFileName,
const char16_t *lpNewFileName, bool32 bFailIfExists)
paramsnonnull();
bool32 MoveFile(const char16_t *lpExistingFileName,
const char16_t *lpNewFileName) paramsnonnull();
bool32 MoveFileEx(const char16_t *lpExistingFileName,
const char16_t *opt_lpNewFileName, int dwFlags)
paramsnonnull((1));
bool32 SetCurrentDirectory(const char16_t *lpPathName);
uint32_t GetCurrentDirectory(uint32_t nBufferLength, char16_t *out_lpBuffer);
bool32 CreateDirectory(const char16_t *lpPathName,
const struct NtSecurityAttributes *lpSecurityAttributes);
bool32 RemoveDirectory(const char16_t *lpPathName);
bool32 DuplicateHandle(int64_t hSourceProcessHandle, int64_t hSourceHandle,
int64_t hTargetProcessHandle, int64_t *lpTargetHandle,
uint32_t dwDesiredAccess, bool32 bInheritHandle,
uint32_t dwOptions);
bool32 GetHandleInformation(int64_t hObject, uint32_t *out_lpdwFlags);
bool32 SetHandleInformation(int64_t hObject, uint32_t dwMask, uint32_t dwFlags);
int GetFileType(int64_t hFile);
bool32 GetFileInformationByHandleEx(int64_t hFile,
uint32_t FileInformationClass,
void *out_lpFileInformation,
uint32_t dwBufferSize);
bool32 GetFileInformationByHandle(
int64_t hFile, struct NtByHandleFileInformation *lpFileInformation);
uint32_t GetFileAttributes(const char16_t *lpFileName);
bool32 GetFileAttributesEx(
const char16_t *lpFileName, int fInfoLevelId /* kNtGetFileExInfoStandard */,
void *out_lpFileInformation /* → struct NtWin32FileAttributeData * */)
paramsnonnull();
uint32_t GetCompressedFileSize(const char16_t *lpFileName,
uint32_t *lpFileSizeHigh);
bool32 SetFileAttributes(const char16_t *lpFileName, uint32_t dwFileAttributes);
bool32 GetFileTime(int64_t hFile, struct NtFileTime *opt_lpCreationFileTime,
struct NtFileTime *opt_lpLastAccessFileTime,
struct NtFileTime *opt_lpLastWriteFileTime);
bool32 SetFileTime(int64_t hFile,
const struct NtFileTime *opt_lpCreationFileTime,
const struct NtFileTime *opt_lpLastAccessFileTime,
const struct NtFileTime *opt_lpLastWriteFileTime);
bool32 DeviceIoControl(int64_t hDevice, uint32_t dwIoControlCode,
void *lpInBuffer, uint32_t nInBufferSize,
void *lpOutBuffer, uint32_t nOutBufferSize,
uint32_t *lpBytesReturned,
struct NtOverlapped *lpOverlapped);
bool32 LockFile(int64_t hFile, uint32_t dwFileOffsetLow,
uint32_t dwFileOffsetHigh, uint32_t nNumberOfBytesToLockLow,
uint32_t nNumberOfBytesToLockHigh);
bool32 UnlockFile(int64_t hFile, uint32_t dwFileOffsetLow,
uint32_t dwFileOffsetHigh, uint32_t nNumberOfBytesToUnlockLow,
uint32_t nNumberOfBytesToUnlockHigh);
bool32 LockFileEx(int64_t hFile, uint32_t dwFlags, uint32_t dwReserved,
uint32_t nNumberOfBytesToLockLow,
uint32_t nNumberOfBytesToLockHigh,
struct NtOverlapped *lpOverlapped) paramsnonnull();
bool32 UnlockFileEx(int64_t hFile, uint32_t dwReserved,
uint32_t nNumberOfBytesToUnlockLow,
uint32_t nNumberOfBytesToUnlockHigh,
struct NtOverlapped *lpOverlapped) paramsnonnull();
bool32 CreateHardLink(const char16_t *lpFileName,
const char16_t *lpExistingFileName,
const struct NtSecurityAttributes *reserved)
paramsnonnull((1, 2));
bool32 CreateSymbolicLink(const char16_t *lpSymlinkFileName,
const char16_t *lpTargetPathName, uint32_t dwFlags)
paramsnonnull();
bool32 SetFilePointerEx(int64_t hFile, int64_t liDistanceToMove,
int64_t *optional_lpNewFilePointer, int dwMoveMethod);
bool32 SetEndOfFile(int64_t hFile);
bool32 SetFileValidData(int64_t hFile, int64_t ValidDataLength);
bool32 GetFileSecurity(const char16_t *lpFileName,
uint32_t RequestedInformation,
struct NtSecurityDescriptor *pSecurityDescriptor,
uint32_t nLength, uint32_t *lpnLengthNeeded);
bool32 OpenProcessToken(int64_t hProcessHandle, uint32_t dwDesiredAccess,
int64_t *out_hTokenHandle);
bool32 DuplicateToken(int64_t hExistingTokenHandle, int dwImpersonationLevel,
int64_t *out_hDuplicateTokenHandle);
bool32 DuplicateTokenEx(int64_t hExistingToken, unsigned int dwDesiredAccess,
const struct NtSecurityAttributes *lpTokenAttributes,
int ImpersonationLevel, int TokenType,
int64_t *out_phNewToken);
bool32 AccessCheck(struct NtSecurityDescriptor *pSecurityDescriptor,
int64_t ClientToken, unsigned int DesiredAccess,
struct NtGenericMapping *lpGenericMapping,
struct NtPrivilegeSet *lpPrivilegeSet,
unsigned int *PrivilegeSetLength,
unsigned int *GrantedAccess, bool32 *AccessStatus);
void MapGenericMask(uint32_t *AccessMask,
struct NtGenericMapping *GenericMapping);
int64_t FindFirstFile(const char16_t *lpFileName,
struct NtWin32FindData *out_lpFindFileData);
int64_t FindFirstFileEx(const char16_t *lpFileName, int fInfoLevelId,
void *out_lpFindFileData, int fSearchOp,
void *reserved_lpSearchFilter,
uint32_t dwAdditionalFlags);
bool32 FindNextFile(int64_t hFindFile,
struct NtWin32FindData *out_lpFindFileData);
bool32 FindClose(int64_t hFindFile);
int64_t FindFirstVolume(char16_t *out_lpszVolumeName, uint32_t cchBufferLength);
bool32 FindNextVolume(int64_t inout_hFindVolume, char16_t *out_lpszVolumeName,
uint32_t cchBufferLength);
bool32 FindVolumeClose(int64_t hFindVolume);
bool32 ReadFileScatter(
int64_t hFileOpenedWithOverlappedAndNoBuffering,
const union NtFileSegmentElement
aNullTerminatedPageAlignedSizedSegmentArray[],
uint32_t nNumberOfBytesToReadThatsMultipleOfFileVolumeSectorSize,
uint32_t *lpReserved, struct NtOverlapped *inout_lpOverlapped)
paramsnonnull();
bool32 WriteFileGather(int64_t hFileOpenedWithOverlappedAndNoBuffering,
const union NtFileSegmentElement aSegmentArray[],
uint32_t nNumberOfBytesToWrite, uint32_t *lpReserved,
struct NtOverlapped inout_lpOverlapped) paramsnonnull();
#define kNtFileNameNormalized 0x0
#define kNtFileNameOpened 0x8
#define kNtVolumeNameDos 0x0 /* e.g. \\?\C:\Users\jart */
#define kNtVolumeNameGuid 0x1 /* e.g. \\?\Volume{ea38-etc.}\Users\jart */
#define kNtVolumeNameNt 0x2 /* e.g. \Device\HarddiskVolume4\Users\jart */
#define kNtVolumeNameNone 0x4 /* e.g. \Users\jart */
uint32_t GetFinalPathNameByHandle(int64_t hFile, char16_t *out_path,
uint32_t arraylen, uint32_t flags);
uint32_t GetFullPathName(const char16_t *lpFileName, uint32_t nBufferLength,
char16_t *lpBuffer, char16_t **lpFilePart);
bool32 GetOverlappedResult(int64_t hFile, struct NtOverlapped *lpOverlapped,
uint32_t *lpNumberOfBytesTransferred, bool32 bWait);
bool32 GetOverlappedResultEx(int64_t hFile, struct NtOverlapped *lpOverlapped,
uint32_t *lpNumberOfBytesTransferred,
uint32_t dwMilliseconds, bool32 bAlertable);
bool32 GetVolumePathName(const char16_t *lpszFileName,
char16_t *lpszVolumePathName,
uint32_t cchBufferLength);
bool32 GetVolumeInformationByHandle(int64_t hFile,
char16_t *opt_out_lpVolumeNameBuffer,
uint32_t nVolumeNameSize,
uint32_t *opt_out_lpVolumeSerialNumber,
uint32_t *opt_out_lpMaximumComponentLength,
uint32_t *opt_out_lpFileSystemFlags,
char16_t *opt_out_lpFileSystemNameBuffer,
uint32_t nFileSystemNameSize);
#if ShouldUseMsabiAttribute()
#include "libc/nt/thunk/files.inc"
#endif /* ShouldUseMsabiAttribute() */
COSMOPOLITAN_C_END_
#endif /* !(__ASSEMBLER__ + __LINKER__ + 0) */
#endif /* COSMOPOLITAN_LIBC_NT_FILES_H_ */
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