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win32.c
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/**************************************************************************/
/* */
/* OCaml */
/* */
/* Xavier Leroy, projet Cristal, INRIA Rocquencourt */
/* */
/* Copyright 1996 Institut National de Recherche en Informatique et */
/* en Automatique. */
/* */
/* All rights reserved. This file is distributed under the terms of */
/* the GNU Lesser General Public License version 2.1, with the */
/* special exception on linking described in the file LICENSE. */
/* */
/**************************************************************************/
#define CAML_INTERNALS
/* Win32-specific stuff */
/* FILE_INFO_BY_HANDLE_CLASS and FILE_NAME_INFO are only available from Windows
Vista onwards */
#undef _WIN32_WINNT
#define _WIN32_WINNT 0x0600
#define WIN32_LEAN_AND_MEAN
#include <wtypes.h>
#include <winbase.h>
#include <winsock2.h>
#include <winioctl.h>
#include <direct.h>
#include <stdlib.h>
#include <stdio.h>
#include <stdarg.h>
#include <io.h>
#include <fcntl.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <ctype.h>
#include <errno.h>
#include <string.h>
#include <signal.h>
#include "caml/alloc.h"
#include "caml/codefrag.h"
#include "caml/fail.h"
#include "caml/io.h"
#include "caml/memory.h"
#include "caml/misc.h"
#include "caml/osdeps.h"
#include "caml/signals.h"
#include "caml/sys.h"
#include "caml/winsupport.h"
#include "caml/config.h"
#if defined(SUPPORT_DYNAMIC_LINKING) && !defined(BUILDING_LIBCAMLRUNS)
#define WITH_DYNAMIC_LINKING
#endif
#ifdef WITH_DYNAMIC_LINKING
#include <flexdll.h>
#endif
#ifndef S_ISREG
#define S_ISREG(mode) (((mode) & S_IFMT) == S_IFREG)
#endif
unsigned short caml_win32_major = 0;
unsigned short caml_win32_minor = 0;
unsigned short caml_win32_build = 0;
unsigned short caml_win32_revision = 0;
CAMLnoreturn_start
static void caml_win32_sys_error (int errnum)
CAMLnoreturn_end;
static void caml_win32_sys_error(int errnum)
{
wchar_t buffer[512];
value msg;
if (FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS,
NULL,
errnum,
0,
buffer,
sizeof(buffer)/sizeof(wchar_t),
NULL)) {
msg = caml_copy_string_of_utf16(buffer);
} else {
msg = caml_alloc_sprintf("unknown error #%d", errnum);
}
caml_raise_sys_error(msg);
}
int caml_read_fd(int fd, int flags, void * buf, int n)
{
int retcode;
if ((flags & CHANNEL_FLAG_FROM_SOCKET) == 0) {
caml_enter_blocking_section_no_pending();
retcode = read(fd, buf, n);
/* Large reads from console can fail with ENOMEM. Reduce requested size
and try again. */
if (retcode == -1 && errno == ENOMEM && n > 16384) {
retcode = read(fd, buf, 16384);
}
caml_leave_blocking_section();
if (retcode == -1) caml_sys_io_error(NO_ARG);
} else {
caml_enter_blocking_section_no_pending();
retcode = recv((SOCKET) _get_osfhandle(fd), buf, n, 0);
caml_leave_blocking_section();
if (retcode == -1) caml_win32_sys_error(WSAGetLastError());
}
return retcode;
}
int caml_write_fd(int fd, int flags, void * buf, int n)
{
int retcode;
if ((flags & CHANNEL_FLAG_FROM_SOCKET) == 0) {
caml_enter_blocking_section_no_pending();
retcode = write(fd, buf, n);
caml_leave_blocking_section();
if (retcode == -1) caml_sys_io_error(NO_ARG);
} else {
caml_enter_blocking_section_no_pending();
retcode = send((SOCKET) _get_osfhandle(fd), buf, n, 0);
caml_leave_blocking_section();
if (retcode == -1) caml_win32_sys_error(WSAGetLastError());
}
CAMLassert (retcode > 0);
return retcode;
}
wchar_t * caml_decompose_path(struct ext_table * tbl, wchar_t * path)
{
wchar_t * p, * q;
int n;
if (path == NULL) return NULL;
p = caml_stat_wcsdup(path);
q = p;
while (1) {
for (n = 0; q[n] != 0 && q[n] != L';'; n++) /*nothing*/;
caml_ext_table_add(tbl, q);
q = q + n;
if (*q == 0) break;
*q = 0;
q += 1;
}
return p;
}
wchar_t * caml_search_in_path(struct ext_table * path, const wchar_t * name)
{
wchar_t * dir, * fullname;
char * u8;
const wchar_t * p;
int i;
struct _stati64 st;
for (p = name; *p != 0; p++) {
if (*p == '/' || *p == '\\') goto not_found;
}
for (i = 0; i < path->size; i++) {
dir = path->contents[i];
if (dir[0] == 0) continue;
/* not sure what empty path components mean under Windows */
fullname = caml_stat_wcsconcat(3, dir, L"\\", name);
u8 = caml_stat_strdup_of_utf16(fullname);
caml_gc_message(0x100, "Searching %s\n", u8);
caml_stat_free(u8);
if (_wstati64(fullname, &st) == 0 && S_ISREG(st.st_mode))
return fullname;
caml_stat_free(fullname);
}
not_found:
u8 = caml_stat_strdup_of_utf16(name);
caml_gc_message(0x100, "%s not found in search path\n", u8);
caml_stat_free(u8);
return caml_stat_wcsdup(name);
}
CAMLexport wchar_t * caml_search_exe_in_path(const wchar_t * name)
{
wchar_t * fullname, * filepart;
char * u8;
size_t fullnamelen;
DWORD retcode;
fullnamelen = wcslen(name) + 1;
if (fullnamelen < 256) fullnamelen = 256;
while (1) {
fullname = caml_stat_alloc(fullnamelen*sizeof(wchar_t));
retcode = SearchPath(NULL, /* use system search path */
name,
L".exe", /* add .exe extension if needed */
fullnamelen,
fullname,
&filepart);
if (retcode == 0) {
u8 = caml_stat_strdup_of_utf16(name);
caml_gc_message(0x100, "%s not found in search path\n", u8);
caml_stat_free(u8);
caml_stat_free(fullname);
return caml_stat_strdup_os(name);
}
if (retcode < fullnamelen)
return fullname;
caml_stat_free(fullname);
fullnamelen = retcode + 1;
}
}
wchar_t * caml_search_dll_in_path(struct ext_table * path, const wchar_t * name)
{
wchar_t * dllname;
wchar_t * res;
dllname = caml_stat_wcsconcat(2, name, L".dll");
res = caml_search_in_path(path, dllname);
caml_stat_free(dllname);
return res;
}
#ifdef WITH_DYNAMIC_LINKING
void * caml_dlopen(wchar_t * libname, int for_execution, int global)
{
void *handle;
int flags = (global ? FLEXDLL_RTLD_GLOBAL : 0);
if (!for_execution) flags |= FLEXDLL_RTLD_NOEXEC;
handle = flexdll_wdlopen(libname, flags);
if ((handle != NULL) && ((caml_verb_gc & 0x100) != 0)) {
flexdll_dump_exports(handle);
fflush(stdout);
}
return handle;
}
void caml_dlclose(void * handle)
{
flexdll_dlclose(handle);
}
void * caml_dlsym(void * handle, const char * name)
{
return flexdll_dlsym(handle, name);
}
void * caml_globalsym(const char * name)
{
return flexdll_dlsym(flexdll_wdlopen(NULL,0), name);
}
char * caml_dlerror(void)
{
return flexdll_dlerror();
}
#else
void * caml_dlopen(wchar_t * libname, int for_execution, int global)
{
return NULL;
}
void caml_dlclose(void * handle)
{
}
void * caml_dlsym(void * handle, const char * name)
{
return NULL;
}
void * caml_globalsym(const char * name)
{
return NULL;
}
char * caml_dlerror(void)
{
return "dynamic loading not supported on this platform";
}
#endif /* WITH_DYNAMIC_LINKING */
/* Proper emulation of signal(), including ctrl-C and ctrl-break */
typedef void (*sighandler)(int sig);
static int ctrl_handler_installed = 0;
static volatile sighandler ctrl_handler_action = SIG_DFL;
static BOOL WINAPI ctrl_handler(DWORD event)
{
/* Only ctrl-C and ctrl-Break are handled */
if (event != CTRL_C_EVENT && event != CTRL_BREAK_EVENT) return FALSE;
/* Default behavior is to exit, which we get by not handling the event */
if (ctrl_handler_action == SIG_DFL) return FALSE;
/* Ignore behavior is to do nothing, which we get by claiming that we
have handled the event */
if (ctrl_handler_action == SIG_IGN) return TRUE;
/* Win32 doesn't like it when we do a longjmp() at this point
(it looks like we're running in a different thread than
the main program!). So, just record the signal. */
caml_record_signal(SIGINT);
/* We have handled the event */
return TRUE;
}
sighandler caml_win32_signal(int sig, sighandler action)
{
sighandler oldaction;
if (sig != SIGINT) return signal(sig, action);
if (! ctrl_handler_installed) {
SetConsoleCtrlHandler(ctrl_handler, TRUE);
ctrl_handler_installed = 1;
}
oldaction = ctrl_handler_action;
ctrl_handler_action = action;
return oldaction;
}
/* Expansion of @responsefile and *? file patterns in the command line */
static int argc;
static wchar_t ** argv;
static int argvsize;
static void store_argument(wchar_t * arg);
static void expand_argument(wchar_t * arg);
static void expand_pattern(wchar_t * arg);
static void out_of_memory(void)
{
caml_fatal_error("out of memory while expanding command line");
}
static void store_argument(wchar_t * arg)
{
if (argc + 1 >= argvsize) {
argvsize *= 2;
argv =
(wchar_t **) caml_stat_resize_noexc(argv, argvsize * sizeof(wchar_t *));
if (argv == NULL) out_of_memory();
}
argv[argc++] = arg;
}
static void expand_argument(wchar_t * arg)
{
wchar_t * p;
for (p = arg; *p != 0; p++) {
if (*p == L'*' || *p == L'?') {
expand_pattern(arg);
return;
}
}
store_argument(arg);
}
static void expand_pattern(wchar_t * pat)
{
wchar_t * prefix, * p, * name;
intptr_t handle;
struct _wfinddata_t ffblk;
size_t i;
handle = _wfindfirst(pat, &ffblk);
if (handle == -1) {
store_argument(pat); /* a la Bourne shell */
return;
}
prefix = caml_stat_wcsdup(pat);
/* We need to stop at the first directory or drive boundary, because the
* _findata_t structure contains the filename, not the leading directory. */
for (i = wcslen(prefix); i > 0; i--) {
wchar_t c = prefix[i - 1];
if (c == L'\\' || c == L'/' || c == L':') { prefix[i] = 0; break; }
}
/* No separator was found, it's a filename pattern without a leading
directory. */
if (i == 0)
prefix[0] = 0;
do {
name = caml_stat_wcsconcat(2, prefix, ffblk.name);
store_argument(name);
} while (_wfindnext(handle, &ffblk) != -1);
_findclose(handle);
caml_stat_free(prefix);
}
CAMLexport void caml_expand_command_line(int * argcp, wchar_t *** argvp)
{
int i;
argc = 0;
argvsize = 16;
argv = (wchar_t **) caml_stat_alloc_noexc(argvsize * sizeof(wchar_t *));
if (argv == NULL) out_of_memory();
for (i = 0; i < *argcp; i++) expand_argument((*argvp)[i]);
argv[argc] = NULL;
*argcp = argc;
*argvp = argv;
}
/* Add to [contents] the (short) names of the files contained in
the directory named [dirname]. No entries are added for [.] and [..].
Return 0 on success, -1 on error; set errno in the case of error. */
CAMLexport int caml_read_directory(wchar_t * dirname,
struct ext_table * contents)
{
size_t dirnamelen;
wchar_t * template;
intptr_t h;
struct _wfinddata_t fileinfo;
dirnamelen = wcslen(dirname);
if (dirnamelen > 0 &&
(dirname[dirnamelen - 1] == L'/'
|| dirname[dirnamelen - 1] == L'\\'
|| dirname[dirnamelen - 1] == L':'))
template = caml_stat_wcsconcat(2, dirname, L"*.*");
else
template = caml_stat_wcsconcat(2, dirname, L"\\*.*");
h = _wfindfirst(template, &fileinfo);
if (h == -1) {
caml_stat_free(template);
return errno == ENOENT ? 0 : -1;
}
do {
if (wcscmp(fileinfo.name, L".") != 0 && wcscmp(fileinfo.name, L"..") != 0) {
caml_ext_table_add(contents, caml_stat_strdup_of_utf16(fileinfo.name));
}
} while (_wfindnext(h, &fileinfo) == 0);
_findclose(h);
caml_stat_free(template);
return 0;
}
#ifndef NATIVE_CODE
/* Set up a new thread for control-C emulation and termination */
void caml_signal_thread(void * lpParam)
{
wchar_t *endptr;
HANDLE h;
/* Get an hexa-code raw handle through the environment */
h = (HANDLE) (uintptr_t)
wcstol(caml_secure_getenv(T("CAMLSIGPIPE")), &endptr, 16);
while (1) {
DWORD numread;
BOOL ret;
char iobuf[2];
/* This shall always return a single character */
ret = ReadFile(h, iobuf, 1, &numread, NULL);
if (!ret || numread != 1) caml_do_exit(2);
switch (iobuf[0]) {
case 'C':
caml_record_signal(SIGINT);
break;
case 'T':
raise(SIGTERM);
return;
}
}
}
#endif /* NATIVE_CODE */
#if defined(NATIVE_CODE)
/* Handling of system stack overflow.
* Based on code provided by Olivier Andrieu.
* An EXCEPTION_STACK_OVERFLOW is signaled when the guard page at the
* end of the stack has been accessed. Windows clears the PAGE_GUARD
* protection (making it a regular PAGE_READWRITE) and then calls our
* exception handler. This means that although we're handling an "out
* of stack" condition, there is a bit of stack available to call
* functions and allocate temporaries.
*
* PAGE_GUARD is a one-shot access protection mechanism: we need to
* restore the PAGE_GUARD protection on this page otherwise the next
* stack overflow won't be detected and the program will abruptly exit
* with STATUS_ACCESS_VIOLATION.
*
* Visual Studio 2003 and later (_MSC_VER >= 1300) have a
* _resetstkoflw() function that resets this protection.
* Unfortunately, it cannot work when called directly from the
* exception handler because at this point we are using the page that
* is to be protected.
*
* A solution is to use an alternate stack when restoring the
* protection. However it's not possible to use _resetstkoflw() then
* since it determines the stack pointer by calling alloca(): it would
* try to protect the alternate stack.
*
* Finally, we call caml_raise_stack_overflow; it will either call
* caml_raise_exception which switches back to the normal stack, or
* call caml_fatal_uncaught_exception which terminates the program
* quickly.
*/
static uintnat win32_alt_stack[0x100];
static void caml_reset_stack (void *faulting_address)
{
SYSTEM_INFO si;
DWORD page_size;
MEMORY_BASIC_INFORMATION mbi;
DWORD oldprot;
/* get the system's page size. */
GetSystemInfo (&si);
page_size = si.dwPageSize;
/* get some information on the page the fault occurred */
if (! VirtualQuery (faulting_address, &mbi, sizeof mbi))
goto failed;
VirtualProtect (mbi.BaseAddress, page_size,
mbi.Protect | PAGE_GUARD, &oldprot);
failed:
caml_raise_stack_overflow();
}
#ifndef _WIN64
static LONG CALLBACK
caml_stack_overflow_VEH (EXCEPTION_POINTERS* exn_info)
{
DWORD code = exn_info->ExceptionRecord->ExceptionCode;
CONTEXT *ctx = exn_info->ContextRecord;
DWORD *ctx_ip = &(ctx->Eip);
DWORD *ctx_sp = &(ctx->Esp);
if (code == EXCEPTION_STACK_OVERFLOW &&
caml_find_code_fragment_by_pc((char *) (*ctx_ip)) != NULL)
{
uintnat faulting_address;
uintnat * alt_esp;
/* grab the address that caused the fault */
faulting_address = exn_info->ExceptionRecord->ExceptionInformation[1];
/* call caml_reset_stack(faulting_address) using the alternate stack */
alt_esp = win32_alt_stack + sizeof(win32_alt_stack) / sizeof(uintnat);
*--alt_esp = faulting_address;
*ctx_sp = (uintnat) (alt_esp - 1);
*ctx_ip = (uintnat) &caml_reset_stack;
return EXCEPTION_CONTINUE_EXECUTION;
}
return EXCEPTION_CONTINUE_SEARCH;
}
#else
static LONG CALLBACK
caml_stack_overflow_VEH (EXCEPTION_POINTERS* exn_info)
{
DWORD code = exn_info->ExceptionRecord->ExceptionCode;
CONTEXT *ctx = exn_info->ContextRecord;
if (code == EXCEPTION_STACK_OVERFLOW &&
caml_find_code_fragment_by_pc((char *) (ctx->Rip)) != NULL)
{
uintnat faulting_address;
uintnat * alt_rsp;
/* grab the address that caused the fault */
faulting_address = exn_info->ExceptionRecord->ExceptionInformation[1];
/* refresh runtime parameters from registers */
Caml_state->young_ptr = (value *) ctx->R15;
/* call caml_reset_stack(faulting_address) using the alternate stack */
alt_rsp = win32_alt_stack + sizeof(win32_alt_stack) / sizeof(uintnat);
ctx->Rcx = faulting_address;
ctx->Rsp = (uintnat) (alt_rsp - 4 - 1);
ctx->Rip = (uintnat) &caml_reset_stack;
return EXCEPTION_CONTINUE_EXECUTION;
}
return EXCEPTION_CONTINUE_SEARCH;
}
#endif /* _WIN64 */
static PVOID caml_stack_overflow_handle;
void caml_win32_overflow_detection(void)
{
caml_stack_overflow_handle =
AddVectoredExceptionHandler(1, caml_stack_overflow_VEH);
if (caml_stack_overflow_handle == NULL) {
caml_fatal_error("cannot install stack overflow detection");
}
}
void caml_win32_unregister_overflow_detection(void)
{
RemoveVectoredExceptionHandler(caml_stack_overflow_handle);
}
#endif /* NATIVE_CODE */
/* Seeding of pseudo-random number generators */
int caml_win32_random_seed (intnat data[16])
{
/* For better randomness, consider:
http://msdn.microsoft.com/library/en-us/seccrypto/security/rtlgenrandom.asp
http://blogs.msdn.com/b/michael_howard/archive/2005/01/14/353379.aspx
*/
FILETIME t;
LARGE_INTEGER pc;
GetSystemTimeAsFileTime(&t);
QueryPerformanceCounter(&pc); /* PR#6032 */
data[0] = t.dwLowDateTime;
data[1] = t.dwHighDateTime;
data[2] = GetCurrentProcessId();
data[3] = pc.LowPart;
data[4] = pc.HighPart;
return 5;
}
#if defined(_MSC_VER) && __STDC_SECURE_LIB__ >= 200411L
static void invalid_parameter_handler(const wchar_t* expression,
const wchar_t* function,
const wchar_t* file,
unsigned int line,
uintptr_t pReserved)
{
/* no crash box */
}
void caml_install_invalid_parameter_handler()
{
_set_invalid_parameter_handler(invalid_parameter_handler);
}
#endif
/* Recover executable name */
wchar_t * caml_executable_name(void)
{
wchar_t * name;
DWORD namelen, ret;
namelen = 256;
while (1) {
name = caml_stat_alloc(namelen*sizeof(wchar_t));
ret = GetModuleFileName(NULL, name, namelen);
if (ret == 0) { caml_stat_free(name); return NULL; }
if (ret < namelen) break;
caml_stat_free(name);
if (namelen >= 1024*1024) return NULL; /* avoid runaway and overflow */
namelen *= 2;
}
return name;
}
/* snprintf emulation */
#define CAML_SNPRINTF(_vsnprintf, _vscprintf) \
{ \
int len; \
va_list args; \
\
if (size > 0) { \
va_start(args, format); \
len = _vsnprintf(buf, size, format, args); \
va_end(args); \
if (len >= 0 && len < size) { \
/* [len] characters were stored in [buf], \
a null-terminator was appended. */ \
return len; \
} \
/* [size] characters were stored in [buf], without null termination. \
Put a null terminator, truncating the output. */ \
buf[size - 1] = 0; \
} \
/* Compute the actual length of output, excluding null terminator */ \
va_start(args, format); \
len = _vscprintf(format, args); \
va_end(args); \
return len; \
}
#ifndef _UCRT
int caml_snprintf(char * buf, size_t size, const char * format, ...)
CAML_SNPRINTF(_vsnprintf, _vscprintf)
#endif
int caml_snwprintf(wchar_t * buf, size_t size, const wchar_t * format, ...)
CAML_SNPRINTF(_vsnwprintf, _vscwprintf)
#undef CAML_SNPRINTF
wchar_t *caml_secure_getenv (wchar_t const *var)
{
/* Win32 doesn't have a notion of setuid bit, so getenv is safe. */
return _wgetenv(var);
}
/* caml_win32_getenv is used to implement Sys.getenv and Unix.getenv in such a
way that they get direct access to the Win32 environment rather than to the
copy that is cached by the C runtime system. The result of caml_win32_getenv
is dynamically allocated and must be explicitly deallocated.
In contrast, the OCaml runtime system still calls _wgetenv from the C runtime
system, via caml_secure_getenv. The result is statically allocated and needs
no deallocation. */
CAMLexport wchar_t *caml_win32_getenv(wchar_t const *lpName)
{
wchar_t * lpBuffer;
DWORD nSize = 256, res;
lpBuffer = caml_stat_alloc_noexc(nSize * sizeof(wchar_t));
if (lpBuffer == NULL)
return NULL;
res = GetEnvironmentVariable(lpName, lpBuffer, nSize);
if (res == 0) {
caml_stat_free(lpBuffer);
return NULL;
}
if (res < nSize)
return lpBuffer;
nSize = res;
lpBuffer = caml_stat_resize_noexc(lpBuffer, nSize * sizeof(wchar_t));
if (lpBuffer == NULL)
return NULL;
res = GetEnvironmentVariable(lpName, lpBuffer, nSize);
if (res == 0 || res >= nSize) {
caml_stat_free(lpBuffer);
return NULL;
}
return lpBuffer;
}
/* The rename() implementation in MSVC's CRT is based on MoveFile()
and therefore fails if the new name exists. This is inconsistent
with POSIX and a problem in practice. Here we reimplement
rename() using MoveFileEx() to make it more POSIX-like.
There are no official guarantee that the rename operation is atomic,
but it is widely believed to be atomic on NTFS. */
int caml_win32_rename(const wchar_t * oldpath, const wchar_t * newpath)
{
/* MOVEFILE_REPLACE_EXISTING: to be closer to POSIX
MOVEFILE_COPY_ALLOWED: MoveFile performs a copy if old and new
paths are on different devices, so we do the same here for
compatibility with the old rename()-based implementation.
MOVEFILE_WRITE_THROUGH: not sure it's useful; affects only
the case where a copy is done. */
if (MoveFileEx(oldpath, newpath,
MOVEFILE_REPLACE_EXISTING | MOVEFILE_WRITE_THROUGH |
MOVEFILE_COPY_ALLOWED)) {
return 0;
}
/* Modest attempt at mapping Win32 error codes to POSIX error codes.
The __dosmaperr() function from the CRT does a better job but is
generally not accessible. */
switch (GetLastError()) {
case ERROR_FILE_NOT_FOUND: case ERROR_PATH_NOT_FOUND:
errno = ENOENT; break;
case ERROR_ACCESS_DENIED: case ERROR_WRITE_PROTECT: case ERROR_CANNOT_MAKE:
errno = EACCES; break;
case ERROR_CURRENT_DIRECTORY: case ERROR_BUSY:
errno = EBUSY; break;
case ERROR_NOT_SAME_DEVICE:
errno = EXDEV; break;
case ERROR_ALREADY_EXISTS:
errno = EEXIST; break;
default:
errno = EINVAL;
}
return -1;
}
int caml_win32_unlink(const wchar_t * path) {
int ret;
ret = _wunlink(path);
/* On Windows, trying to unlink a symlink to a directory will return
* EACCES, but the symlink can be deleted with rmdir. */
if (ret == -1 && errno == EACCES) {
HANDLE h;
DWORD attrs, dummy;
union {
char raw[16384];
REPARSE_DATA_BUFFER point;
} buffer;
attrs = GetFileAttributes(path);
if (attrs == INVALID_FILE_ATTRIBUTES ||
!(attrs & (FILE_ATTRIBUTE_DIRECTORY | FILE_ATTRIBUTE_REPARSE_POINT)))
return -1;
h = CreateFile(path,
FILE_READ_ATTRIBUTES,
FILE_SHARE_DELETE | FILE_SHARE_READ | FILE_SHARE_WRITE,
NULL,
OPEN_EXISTING,
FILE_FLAG_BACKUP_SEMANTICS | FILE_FLAG_OPEN_REPARSE_POINT,
NULL);
if (h == INVALID_HANDLE_VALUE)
return -1;
ret = DeviceIoControl(h, FSCTL_GET_REPARSE_POINT, NULL, 0, &buffer.point,
sizeof(buffer.raw), &dummy, NULL);
CloseHandle(h);
if (!ret || buffer.point.ReparseTag != IO_REPARSE_TAG_SYMLINK)
return -1;
ret = _wrmdir(path);
if (ret == -1)
errno = EACCES;
}
return ret;
}
/* Windows Unicode support */
static uintnat windows_unicode_enabled = WINDOWS_UNICODE;
/* If [windows_unicode_strict] is non-zero, then illegal UTF-8 characters (on
the OCaml side) or illegal UTF-16 characters (on the Windows side) cause an
error to be signaled. What happens then depends on the variable
[windows_unicode_fallback].
If [windows_unicode_strict] is zero, then illegal characters are silently
dropped. */
static uintnat windows_unicode_strict = 1;
/* If [windows_unicode_fallback] is non-zero, then if an error is signaled when
translating to UTF-16, the translation is re-done under the assumption that
the argument string is encoded in the local codepage. */
static uintnat windows_unicode_fallback = 1;
CAMLexport int win_multi_byte_to_wide_char(const char *s, int slen,
wchar_t *out, int outlen)
{
int retcode;
CAMLassert (s != NULL);
if (slen == 0)
return 0;
if (windows_unicode_enabled != 0) {
retcode =
MultiByteToWideChar(CP_UTF8,
windows_unicode_strict ? MB_ERR_INVALID_CHARS : 0,
s, slen, out, outlen);
if (retcode == 0 && windows_unicode_fallback != 0)
retcode = MultiByteToWideChar(CP_ACP, 0, s, slen, out, outlen);
} else {
retcode = MultiByteToWideChar(CP_ACP, 0, s, slen, out, outlen);
}
if (retcode == 0)
caml_win32_sys_error(GetLastError());
return retcode;
}
/* For old versions of Windows we simply ignore the flag */
#ifndef WC_ERR_INVALID_CHARS
#define WC_ERR_INVALID_CHARS 0
#endif
CAMLexport int win_wide_char_to_multi_byte(const wchar_t *s, int slen,
char *out, int outlen)
{
int retcode;
CAMLassert(s != NULL);
if (slen == 0)
return 0;
if (windows_unicode_enabled != 0)
retcode =
WideCharToMultiByte(CP_UTF8,
windows_unicode_strict ? WC_ERR_INVALID_CHARS : 0,
s, slen, out, outlen, NULL, NULL);
else
retcode =
WideCharToMultiByte(CP_ACP, 0, s, slen, out, outlen, NULL, NULL);
if (retcode == 0)
caml_win32_sys_error(GetLastError());
return retcode;
}
CAMLexport value caml_copy_string_of_utf16(const wchar_t *s)
{
int retcode, slen;
value v;
slen = wcslen(s);
/* Do not include final NULL */
retcode = win_wide_char_to_multi_byte(s, slen, NULL, 0);
v = caml_alloc_string(retcode);
win_wide_char_to_multi_byte(s, slen, (char *)String_val(v), retcode);
return v;
}
CAMLexport wchar_t* caml_stat_strdup_to_utf16(const char *s)
{
wchar_t * ws;
int retcode;
retcode = win_multi_byte_to_wide_char(s, -1, NULL, 0);
ws = caml_stat_alloc_noexc(retcode * sizeof(*ws));
win_multi_byte_to_wide_char(s, -1, ws, retcode);
return ws;
}
CAMLexport caml_stat_string caml_stat_strdup_of_utf16(const wchar_t *s)
{
caml_stat_string out;
int retcode;
retcode = win_wide_char_to_multi_byte(s, -1, NULL, 0);
out = caml_stat_alloc(retcode);
win_wide_char_to_multi_byte(s, -1, out, retcode);
return out;
}
void caml_probe_win32_version(void)
{
/* Determine the version of Windows we're running, and cache it */
WCHAR fileName[MAX_PATH];
DWORD size =
GetModuleFileName(GetModuleHandle(L"kernel32"), fileName, MAX_PATH);
DWORD dwHandle = 0;
BYTE* versionInfo;
fileName[size] = 0;
size = GetFileVersionInfoSize(fileName, &dwHandle);
versionInfo = (BYTE*)malloc(size * sizeof(BYTE));
if (GetFileVersionInfo(fileName, 0, size, versionInfo)) {
UINT len = 0;
VS_FIXEDFILEINFO* vsfi = NULL;
VerQueryValue(versionInfo, L"\\", (void**)&vsfi, &len);
caml_win32_major = HIWORD(vsfi->dwProductVersionMS);
caml_win32_minor = LOWORD(vsfi->dwProductVersionMS);
caml_win32_build = HIWORD(vsfi->dwProductVersionLS);
caml_win32_revision = LOWORD(vsfi->dwProductVersionLS);
}
free(versionInfo);
}
static UINT startup_codepage = 0;
void caml_setup_win32_terminal(void)
{
if (caml_win32_major >= 10) {
startup_codepage = GetConsoleOutputCP();
if (startup_codepage != CP_UTF8)
SetConsoleOutputCP(CP_UTF8);
}
}
void caml_restore_win32_terminal(void)
{
if (startup_codepage != 0)
SetConsoleOutputCP(startup_codepage);
}
/* Detect if a named pipe corresponds to a Cygwin/MSYS pty: see
https://github.com/mirror/newlib-cygwin/blob/00e9bf2/winsup/cygwin/dtable.cc#L932
*/
typedef