107 lines
3.6 KiB
C
107 lines
3.6 KiB
C
/**************************************************************************/
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/* */
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/* OCaml */
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/* */
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/* David Allsopp, MetaStack Solutions Ltd. */
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/* */
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/* Copyright 2015 MetaStack Solutions Ltd. */
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/* */
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/* All rights reserved. This file is distributed under the terms of */
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/* the GNU Lesser General Public License version 2.1, with the */
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/* special exception on linking described in the file LICENSE. */
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/* */
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/**************************************************************************/
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#define CAML_INTERNALS
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#include <caml/mlvalues.h>
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#include <caml/memory.h>
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#include <caml/alloc.h>
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#include <caml/fail.h>
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#include <caml/signals.h>
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#include <caml/osdeps.h>
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#include "unixsupport.h"
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#include <errno.h>
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#include <winioctl.h>
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CAMLprim value unix_readlink(value opath)
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{
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CAMLparam1(opath);
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CAMLlocal1(result);
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HANDLE h;
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wchar_t* path;
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DWORD attributes;
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caml_unix_check_path(opath, "readlink");
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path = caml_stat_strdup_to_utf16(String_val(opath));
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caml_enter_blocking_section();
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attributes = GetFileAttributes(path);
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caml_leave_blocking_section();
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if (attributes == INVALID_FILE_ATTRIBUTES) {
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caml_stat_free(path);
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win32_maperr(GetLastError());
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uerror("readlink", opath);
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}
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else if (!(attributes & FILE_ATTRIBUTE_REPARSE_POINT)) {
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caml_stat_free(path);
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errno = EINVAL;
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uerror("readlink", opath);
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}
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else {
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caml_enter_blocking_section();
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if ((h = CreateFile(path,
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FILE_READ_ATTRIBUTES,
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FILE_SHARE_DELETE | FILE_SHARE_READ | FILE_SHARE_WRITE,
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NULL,
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OPEN_EXISTING,
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FILE_FLAG_BACKUP_SEMANTICS | FILE_FLAG_OPEN_REPARSE_POINT,
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NULL)) == INVALID_HANDLE_VALUE) {
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caml_leave_blocking_section();
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caml_stat_free(path);
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errno = ENOENT;
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uerror("readlink", opath);
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}
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else {
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char buffer[16384];
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DWORD read;
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REPARSE_DATA_BUFFER* point;
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caml_stat_free(path);
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if (DeviceIoControl(h, FSCTL_GET_REPARSE_POINT, NULL, 0, buffer, 16384, &read, NULL)) {
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caml_leave_blocking_section();
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point = (REPARSE_DATA_BUFFER*)buffer;
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if (point->ReparseTag == IO_REPARSE_TAG_SYMLINK) {
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int cbLen = point->SymbolicLinkReparseBuffer.SubstituteNameLength / sizeof(WCHAR);
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int len;
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len =
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win_wide_char_to_multi_byte(
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point->SymbolicLinkReparseBuffer.PathBuffer + point->SymbolicLinkReparseBuffer.SubstituteNameOffset / sizeof(WCHAR),
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cbLen, NULL, 0);
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result = caml_alloc_string(len);
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win_wide_char_to_multi_byte(
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point->SymbolicLinkReparseBuffer.PathBuffer + point->SymbolicLinkReparseBuffer.SubstituteNameOffset / sizeof(WCHAR),
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cbLen,
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(char *)String_val(result),
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len);
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CloseHandle(h);
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}
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else {
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errno = EINVAL;
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CloseHandle(h);
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uerror("readline", opath);
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}
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}
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else {
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caml_leave_blocking_section();
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win32_maperr(GetLastError());
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CloseHandle(h);
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uerror("readlink", opath);
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}
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}
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}
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CAMLreturn(result);
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}
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