X-Git-Url: https://wimlib.net/git/?p=wimlib;a=blobdiff_plain;f=src%2Fwin32_replacements.c;h=2a16500da67964bd8e87b3e293a46023a439263b;hp=fcb22f7a1593bc4186ef77fcbde70fb17ac69ea9;hb=90f1e04a2a143876a4413577b25db60b5ba0fe97;hpb=30356bd78dfd179d640bbfee10fbf5cfd5717d8c

diff --git a/src/win32_replacements.c b/src/win32_replacements.c
index fcb22f7a..2a16500d 100644
--- a/src/win32_replacements.c
+++ b/src/win32_replacements.c
@@ -4,22 +4,20 @@
  */
 
 /*
- * Copyright (C) 2013 Eric Biggers
+ * Copyright (C) 2013-2016 Eric Biggers
  *
- * This file is part of wimlib, a library for working with WIM files.
+ * This file is free software; you can redistribute it and/or modify it under
+ * the terms of the GNU Lesser General Public License as published by the Free
+ * Software Foundation; either version 3 of the License, or (at your option) any
+ * later version.
  *
- * wimlib is free software; you can redistribute it and/or modify it under the
- * terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 3 of the License, or (at your option)
- * any later version.
- *
- * wimlib is distributed in the hope that it will be useful, but WITHOUT ANY
- * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
- * A PARTICULAR PURPOSE. See the GNU General Public License for more
+ * This file is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
  * details.
  *
- * You should have received a copy of the GNU General Public License
- * along with wimlib; if not, see http://www.gnu.org/licenses/.
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this file; if not, see http://www.gnu.org/licenses/.
  */
 
 #ifdef __WIN32__
@@ -31,6 +29,7 @@
 #include <errno.h>
 #include <pthread.h>
 #include <io.h>	/* for _get_osfhandle()  */
+#include <fcntl.h>
 
 #include "wimlib/win32_common.h"
 
@@ -39,6 +38,287 @@
 #include "wimlib/error.h"
 #include "wimlib/util.h"
 
+static int
+win32_error_to_errno(DWORD err_code)
+{
+	/* This mapping is that used in Cygwin.
+	 * Some of these choices are arbitrary. */
+	switch (err_code) {
+	case ERROR_ACCESS_DENIED:
+		return EACCES;
+	case ERROR_ACTIVE_CONNECTIONS:
+		return EAGAIN;
+	case ERROR_ALREADY_EXISTS:
+		return EEXIST;
+	case ERROR_BAD_DEVICE:
+		return ENODEV;
+	case ERROR_BAD_EXE_FORMAT:
+		return ENOEXEC;
+	case ERROR_BAD_NETPATH:
+		return ENOENT;
+	case ERROR_BAD_NET_NAME:
+		return ENOENT;
+	case ERROR_BAD_NET_RESP:
+		return ENOSYS;
+	case ERROR_BAD_PATHNAME:
+		return ENOENT;
+	case ERROR_BAD_PIPE:
+		return EINVAL;
+	case ERROR_BAD_UNIT:
+		return ENODEV;
+	case ERROR_BAD_USERNAME:
+		return EINVAL;
+	case ERROR_BEGINNING_OF_MEDIA:
+		return EIO;
+	case ERROR_BROKEN_PIPE:
+		return EPIPE;
+	case ERROR_BUSY:
+		return EBUSY;
+	case ERROR_BUS_RESET:
+		return EIO;
+	case ERROR_CALL_NOT_IMPLEMENTED:
+		return ENOSYS;
+	case ERROR_CANNOT_MAKE:
+		return EPERM;
+	case ERROR_CHILD_NOT_COMPLETE:
+		return EBUSY;
+	case ERROR_COMMITMENT_LIMIT:
+		return EAGAIN;
+	case ERROR_CRC:
+		return EIO;
+	case ERROR_DEVICE_DOOR_OPEN:
+		return EIO;
+	case ERROR_DEVICE_IN_USE:
+		return EAGAIN;
+	case ERROR_DEVICE_REQUIRES_CLEANING:
+		return EIO;
+	case ERROR_DIRECTORY:
+		return ENOTDIR;
+	case ERROR_DIR_NOT_EMPTY:
+		return ENOTEMPTY;
+	case ERROR_DISK_CORRUPT:
+		return EIO;
+	case ERROR_DISK_FULL:
+		return ENOSPC;
+#ifdef ENOTUNIQ
+	case ERROR_DUP_NAME:
+		return ENOTUNIQ;
+#endif
+	case ERROR_EAS_DIDNT_FIT:
+		return ENOSPC;
+#ifdef ENOTSUP
+	case ERROR_EAS_NOT_SUPPORTED:
+		return ENOTSUP;
+#endif
+	case ERROR_EA_LIST_INCONSISTENT:
+		return EINVAL;
+	case ERROR_EA_TABLE_FULL:
+		return ENOSPC;
+	case ERROR_END_OF_MEDIA:
+		return ENOSPC;
+	case ERROR_EOM_OVERFLOW:
+		return EIO;
+	case ERROR_EXE_MACHINE_TYPE_MISMATCH:
+		return ENOEXEC;
+	case ERROR_EXE_MARKED_INVALID:
+		return ENOEXEC;
+	case ERROR_FILEMARK_DETECTED:
+		return EIO;
+	case ERROR_FILENAME_EXCED_RANGE:
+		return ENAMETOOLONG;
+	case ERROR_FILE_CORRUPT:
+		return EEXIST;
+	case ERROR_FILE_EXISTS:
+		return EEXIST;
+	case ERROR_FILE_INVALID:
+		return ENXIO;
+	case ERROR_FILE_NOT_FOUND:
+		return ENOENT;
+	case ERROR_HANDLE_DISK_FULL:
+		return ENOSPC;
+#ifdef ENODATA
+	case ERROR_HANDLE_EOF:
+		return ENODATA;
+#endif
+	case ERROR_INVALID_ADDRESS:
+		return EINVAL;
+	case ERROR_INVALID_AT_INTERRUPT_TIME:
+		return EINTR;
+	case ERROR_INVALID_BLOCK_LENGTH:
+		return EIO;
+	case ERROR_INVALID_DATA:
+		return EINVAL;
+	case ERROR_INVALID_DRIVE:
+		return ENODEV;
+	case ERROR_INVALID_EA_NAME:
+		return EINVAL;
+	case ERROR_INVALID_EXE_SIGNATURE:
+		return ENOEXEC;
+#ifdef EBADRQC
+	case ERROR_INVALID_FUNCTION:
+		return EBADRQC;
+#endif
+	case ERROR_INVALID_HANDLE:
+		return EBADF;
+	case ERROR_INVALID_NAME:
+		return ENOENT;
+	case ERROR_INVALID_PARAMETER:
+		return EINVAL;
+	case ERROR_INVALID_SIGNAL_NUMBER:
+		return EINVAL;
+	case ERROR_IOPL_NOT_ENABLED:
+		return ENOEXEC;
+	case ERROR_IO_DEVICE:
+		return EIO;
+	case ERROR_IO_INCOMPLETE:
+		return EAGAIN;
+	case ERROR_IO_PENDING:
+		return EAGAIN;
+	case ERROR_LOCK_VIOLATION:
+		return EBUSY;
+	case ERROR_MAX_THRDS_REACHED:
+		return EAGAIN;
+	case ERROR_META_EXPANSION_TOO_LONG:
+		return EINVAL;
+	case ERROR_MOD_NOT_FOUND:
+		return ENOENT;
+#ifdef EMSGSIZE
+	case ERROR_MORE_DATA:
+		return EMSGSIZE;
+#endif
+	case ERROR_NEGATIVE_SEEK:
+		return EINVAL;
+	case ERROR_NETNAME_DELETED:
+		return ENOENT;
+	case ERROR_NOACCESS:
+		return EFAULT;
+	case ERROR_NONE_MAPPED:
+		return EINVAL;
+	case ERROR_NONPAGED_SYSTEM_RESOURCES:
+		return EAGAIN;
+#ifdef ENOLINK
+	case ERROR_NOT_CONNECTED:
+		return ENOLINK;
+#endif
+	case ERROR_NOT_ENOUGH_MEMORY:
+		return ENOMEM;
+	case ERROR_NOT_OWNER:
+		return EPERM;
+#ifdef ENOMEDIUM
+	case ERROR_NOT_READY:
+		return ENOMEDIUM;
+#endif
+	case ERROR_NOT_SAME_DEVICE:
+		return EXDEV;
+	case ERROR_NOT_SUPPORTED:
+		return ENOSYS;
+	case ERROR_NO_DATA:
+		return EPIPE;
+	case ERROR_NO_DATA_DETECTED:
+		return EIO;
+#ifdef ENOMEDIUM
+	case ERROR_NO_MEDIA_IN_DRIVE:
+		return ENOMEDIUM;
+#endif
+#ifdef ENMFILE
+	case ERROR_NO_MORE_FILES:
+		return ENMFILE;
+#endif
+#ifdef ENMFILE
+	case ERROR_NO_MORE_ITEMS:
+		return ENMFILE;
+#endif
+	case ERROR_NO_MORE_SEARCH_HANDLES:
+		return ENFILE;
+	case ERROR_NO_PROC_SLOTS:
+		return EAGAIN;
+	case ERROR_NO_SIGNAL_SENT:
+		return EIO;
+	case ERROR_NO_SYSTEM_RESOURCES:
+		return EFBIG;
+	case ERROR_NO_TOKEN:
+		return EINVAL;
+	case ERROR_OPEN_FAILED:
+		return EIO;
+	case ERROR_OPEN_FILES:
+		return EAGAIN;
+	case ERROR_OUTOFMEMORY:
+		return ENOMEM;
+	case ERROR_PAGED_SYSTEM_RESOURCES:
+		return EAGAIN;
+	case ERROR_PAGEFILE_QUOTA:
+		return EAGAIN;
+	case ERROR_PATH_NOT_FOUND:
+		return ENOENT;
+	case ERROR_PIPE_BUSY:
+		return EBUSY;
+	case ERROR_PIPE_CONNECTED:
+		return EBUSY;
+#ifdef ECOMM
+	case ERROR_PIPE_LISTENING:
+		return ECOMM;
+	case ERROR_PIPE_NOT_CONNECTED:
+		return ECOMM;
+#endif
+	case ERROR_POSSIBLE_DEADLOCK:
+		return EDEADLOCK;
+	case ERROR_PRIVILEGE_NOT_HELD:
+		return EPERM;
+	case ERROR_PROCESS_ABORTED:
+		return EFAULT;
+	case ERROR_PROC_NOT_FOUND:
+		return ESRCH;
+#ifdef ENONET
+	case ERROR_REM_NOT_LIST:
+		return ENONET;
+#endif
+	case ERROR_SECTOR_NOT_FOUND:
+		return EINVAL;
+	case ERROR_SEEK:
+		return EINVAL;
+	case ERROR_SETMARK_DETECTED:
+		return EIO;
+	case ERROR_SHARING_BUFFER_EXCEEDED:
+		return ENOLCK;
+	case ERROR_SHARING_VIOLATION:
+		return EBUSY;
+	case ERROR_SIGNAL_PENDING:
+		return EBUSY;
+	case ERROR_SIGNAL_REFUSED:
+		return EIO;
+#ifdef ELIBBAD
+	case ERROR_SXS_CANT_GEN_ACTCTX:
+		return ELIBBAD;
+#endif
+	case ERROR_THREAD_1_INACTIVE:
+		return EINVAL;
+	case ERROR_TOO_MANY_LINKS:
+		return EMLINK;
+	case ERROR_TOO_MANY_OPEN_FILES:
+		return EMFILE;
+	case ERROR_WAIT_NO_CHILDREN:
+		return ECHILD;
+	case ERROR_WORKING_SET_QUOTA:
+		return EAGAIN;
+	case ERROR_WRITE_PROTECT:
+		return EROFS;
+	default:
+		return -1;
+	}
+}
+
+static void
+set_errno_from_win32_error(DWORD err)
+{
+	errno = win32_error_to_errno(err);
+}
+
+static void
+set_errno_from_GetLastError(void)
+{
+	set_errno_from_win32_error(GetLastError());
+}
+
 /* Replacement for POSIX fsync() */
 int
 fsync(int fd)
@@ -59,7 +339,7 @@ err:
 
 /* Use the Win32 API to get the number of processors.  */
 unsigned
-win32_get_number_of_processors(void)
+get_available_cpus(void)
 {
 	SYSTEM_INFO sysinfo;
 	GetSystemInfo(&sysinfo);
@@ -68,13 +348,13 @@ win32_get_number_of_processors(void)
 
 /* Use the Win32 API to get the amount of available memory.  */
 u64
-win32_get_avail_memory(void)
+get_available_memory(void)
 {
 	MEMORYSTATUSEX status = {
 		.dwLength = sizeof(status),
 	};
 	GlobalMemoryStatusEx(&status);
-	return status.ullTotalPhys;
+	return (u64)min(status.ullTotalPhys, status.ullTotalVirtual) * 85 / 100;
 }
 
 /* Replacement for POSIX-2008 realpath().  Warning: partial functionality only
@@ -159,7 +439,7 @@ win32_rename_replacement(const wchar_t *srcpath, const wchar_t *dstpath)
 		p = tmpname;
 		p = wmempcpy(p, dstpath, dstlen);
 		p = wmempcpy(p, orig_suffix, ARRAY_LEN(orig_suffix));
-		randomize_char_array_with_alnum(p, num_rand_chars);
+		get_random_alnum_chars(p, num_rand_chars);
 		p += num_rand_chars;
 		*p = L'\0';
 	}
@@ -188,41 +468,10 @@ err_set_errno:
 	return -1;
 }
 
-/* truncate() replacement */
-int
-win32_truncate_replacement(const wchar_t *path, off_t size)
-{
-	DWORD err = NO_ERROR;
-	LARGE_INTEGER liOffset;
-
-	HANDLE h = win32_open_existing_file(path, GENERIC_WRITE);
-	if (h == INVALID_HANDLE_VALUE)
-		goto fail;
-
-	liOffset.QuadPart = size;
-	if (!SetFilePointerEx(h, liOffset, NULL, FILE_BEGIN))
-		goto fail_close_handle;
-
-	if (!SetEndOfFile(h))
-		goto fail_close_handle;
-	CloseHandle(h);
-	return 0;
-
-fail_close_handle:
-	err = GetLastError();
-	CloseHandle(h);
-fail:
-	if (err == NO_ERROR)
-		err = GetLastError();
-	set_errno_from_win32_error(err);
-	return -1;
-}
-
-
 /* This really could be replaced with _wcserror_s, but this doesn't seem to
  * actually be available in MSVCRT.DLL on Windows XP (perhaps it's statically
  * linked in by Visual Studio...?). */
-extern int
+int
 win32_strerror_r_replacement(int errnum, wchar_t *buf, size_t buflen)
 {
 	static pthread_mutex_t strerror_lock = PTHREAD_MUTEX_INITIALIZER;
@@ -234,51 +483,70 @@ win32_strerror_r_replacement(int errnum, wchar_t *buf, size_t buflen)
 	return 0;
 }
 
+#define MAX_IO_AMOUNT 1048576
+
 static int
 do_pread_or_pwrite(int fd, void *buf, size_t count, off_t offset,
 		   bool is_pwrite)
 {
 	HANDLE h;
 	LARGE_INTEGER orig_offset;
-	DWORD bytes_read_or_written;
+	DWORD result = 0xFFFFFFFF;
 	LARGE_INTEGER relative_offset;
 	OVERLAPPED overlapped;
 	BOOL bret;
+	DWORD err = 0;
 
 	h = (HANDLE)_get_osfhandle(fd);
 	if (h == INVALID_HANDLE_VALUE)
-		goto err;
+		goto error;
 
 	if (GetFileType(h) == FILE_TYPE_PIPE) {
 		errno = ESPIPE;
-		goto err;
+		goto error;
 	}
 
 	/* Get original position */
 	relative_offset.QuadPart = 0;
-	if (!SetFilePointerEx(h, relative_offset, &orig_offset, FILE_CURRENT))
-		goto err_set_errno;
+	if (!SetFilePointerEx(h, relative_offset, &orig_offset, FILE_CURRENT)) {
+		err = GetLastError();
+		win32_error(err, L"Failed to get original file position");
+		goto error;
+	}
 
 	memset(&overlapped, 0, sizeof(overlapped));
 	overlapped.Offset = offset;
 	overlapped.OffsetHigh = offset >> 32;
 
 	/* Do the read or write at the specified offset */
+	count = min(count, MAX_IO_AMOUNT);
+	SetLastError(0);
 	if (is_pwrite)
-		bret = WriteFile(h, buf, count, &bytes_read_or_written, &overlapped);
+		bret = WriteFile(h, buf, count, &result, &overlapped);
 	else
-		bret = ReadFile(h, buf, count, &bytes_read_or_written, &overlapped);
-	if (!bret)
-		goto err_set_errno;
+		bret = ReadFile(h, buf, count, &result, &overlapped);
+	if (!bret) {
+		err = GetLastError();
+		win32_error(err, L"Failed to %s %zu bytes at offset %"PRIu64,
+			    (is_pwrite ? "write" : "read"), count, offset);
+		goto error;
+	}
+
+	wimlib_assert(result <= count);
 
 	/* Restore the original position */
-	if (!SetFilePointerEx(h, orig_offset, NULL, FILE_BEGIN))
-		goto err_set_errno;
+	if (!SetFilePointerEx(h, orig_offset, NULL, FILE_BEGIN)) {
+		err = GetLastError();
+		win32_error(err, L"Failed to restore file position to %"PRIu64,
+			    offset);
+		goto error;
+	}
 
-	return bytes_read_or_written;
-err_set_errno:
-	set_errno_from_GetLastError();
-err:
+	return result;
+
+error:
+	if (err)
+		set_errno_from_win32_error(err);
 	return -1;
 }
 
@@ -286,7 +554,7 @@ err:
  * offset, so it is not safe to use with readers/writers on the same file
  * descriptor.  */
 ssize_t
-pread(int fd, void *buf, size_t count, off_t offset)
+win32_pread(int fd, void *buf, size_t count, off_t offset)
 {
 	return do_pread_or_pwrite(fd, buf, count, offset, false);
 }
@@ -295,39 +563,57 @@ pread(int fd, void *buf, size_t count, off_t offset)
  * offset, so it is not safe to use with readers/writers on the same file
  * descriptor. */
 ssize_t
-pwrite(int fd, const void *buf, size_t count, off_t offset)
+win32_pwrite(int fd, const void *buf, size_t count, off_t offset)
 {
 	return do_pread_or_pwrite(fd, (void*)buf, count, offset, true);
 }
 
-int
-win32_get_file_and_vol_ids(const wchar_t *path, u64 *ino_ret, u64 *dev_ret)
+/* Replacement for read() which doesn't hide the Win32 error code */
+ssize_t
+win32_read(int fd, void *buf, size_t count)
 {
-	HANDLE h;
-	BY_HANDLE_FILE_INFORMATION file_info;
-	int ret;
-	DWORD err;
+	HANDLE h = (HANDLE)_get_osfhandle(fd);
+	DWORD result = 0xFFFFFFFF;
 
-	h = win32_open_existing_file(path, FILE_READ_ATTRIBUTES);
-	if (h == INVALID_HANDLE_VALUE) {
-		ret = WIMLIB_ERR_OPEN;
-		goto out;
+	if (h == INVALID_HANDLE_VALUE)
+		return -1;
+
+	count = min(count, MAX_IO_AMOUNT);
+	SetLastError(0);
+	if (!ReadFile(h, buf, count, &result, NULL)) {
+		DWORD err = GetLastError();
+		win32_error(err,
+			    L"Error reading %zu bytes from fd %d", count, fd);
+		set_errno_from_win32_error(err);
+		return -1;
 	}
 
-	if (!GetFileInformationByHandle(h, &file_info)) {
-		ret = WIMLIB_ERR_STAT;
-	} else {
-		*ino_ret = ((u64)file_info.nFileIndexHigh << 32) |
-			    (u64)file_info.nFileIndexLow;
-		*dev_ret = file_info.dwVolumeSerialNumber;
-		ret = 0;
+	wimlib_assert(result <= count);
+	return result;
+}
+
+/* Replacement for write() which doesn't hide the Win32 error code */
+ssize_t
+win32_write(int fd, const void *buf, size_t count)
+{
+	HANDLE h = (HANDLE)_get_osfhandle(fd);
+	DWORD result = 0xFFFFFFFF;
+
+	if (h == INVALID_HANDLE_VALUE)
+		return -1;
+
+	count = min(count, MAX_IO_AMOUNT);
+	SetLastError(0);
+	if (!WriteFile(h, buf, count, &result, NULL)) {
+		DWORD err = GetLastError();
+		win32_error(err,
+			    L"Error writing %zu bytes to fd %d", count, fd);
+		set_errno_from_win32_error(err);
+		return -1;
 	}
-	err = GetLastError();
-	CloseHandle(h);
-	SetLastError(err);
-out:
-	set_errno_from_GetLastError();
-	return ret;
+
+	wimlib_assert(result <= count);
+	return result;
 }
 
 /* Replacement for glob() in Windows native builds that operates on wide
@@ -433,4 +719,59 @@ globfree(glob_t *pglob)
 	FREE(pglob->gl_pathv);
 }
 
+/* Replacement for fopen(path, "a") that doesn't prevent other processes from
+ * reading the file  */
+FILE *
+win32_open_logfile(const wchar_t *path)
+{
+	HANDLE h;
+	int fd;
+	FILE *fp;
+
+	h = CreateFile(path, FILE_APPEND_DATA, FILE_SHARE_VALID_FLAGS,
+		       NULL, OPEN_ALWAYS, 0, NULL);
+	if (h == INVALID_HANDLE_VALUE)
+		return NULL;
+
+	fd = _open_osfhandle((intptr_t)h, O_APPEND);
+	if (fd < 0) {
+		CloseHandle(h);
+		return NULL;
+	}
+
+	fp = fdopen(fd, "a");
+	if (!fp) {
+		close(fd);
+		return NULL;
+	}
+
+	return fp;
+}
+
+#define RtlGenRandom SystemFunction036
+BOOLEAN WINAPI RtlGenRandom(PVOID RandomBuffer, ULONG RandomBufferLength);
+
+/*
+ * Generate @n cryptographically secure random bytes (thread-safe)
+ *
+ * This is the Windows version.  It uses RtlGenRandom() (actually called
+ * SystemFunction036) from advapi32.dll.
+ */
+void
+get_random_bytes(void *p, size_t n)
+{
+	while (n != 0) {
+		u32 count = min(n, UINT32_MAX);
+
+		if (!RtlGenRandom(p, count)) {
+			win32_error(GetLastError(),
+				    L"RtlGenRandom() failed (count=%u)", count);
+			wimlib_assert(0);
+			count = 0;
+		}
+		p += count;
+		n -= count;
+	}
+}
+
 #endif /* __WIN32__ */