X-Git-Url: https://wimlib.net/git/?a=blobdiff_plain;f=src%2Fwin32_replacements.c;h=3082255033b3123cec78f70d965df4cb16e9c39c;hb=9ca5c20853d3be06378fb985aa75c75df280d1e2;hp=c9a59bab0a90e3fd4d03aff965821362e552a487;hpb=61db93f82eca3fe9f7676355c709c58cc425a6ad;p=wimlib diff --git a/src/win32_replacements.c b/src/win32_replacements.c index c9a59bab..30822550 100644 --- a/src/win32_replacements.c +++ b/src/win32_replacements.c @@ -28,12 +28,15 @@ # include "config.h" #endif +#include #include -#include /* for PathMatchSpecW() */ +#include /* for _get_osfhandle() */ +#include + #include "wimlib/win32_common.h" #include "wimlib/assert.h" -#include "wimlib/file_io.h" +#include "wimlib/glob.h" #include "wimlib/error.h" #include "wimlib/util.h" @@ -55,7 +58,7 @@ err: return -1; } -/* Use the Win32 API to get the number of processors */ +/* Use the Win32 API to get the number of processors. */ unsigned win32_get_number_of_processors(void) { @@ -64,6 +67,17 @@ win32_get_number_of_processors(void) return sysinfo.dwNumberOfProcessors; } +/* Use the Win32 API to get the amount of available memory. */ +u64 +win32_get_avail_memory(void) +{ + MEMORYSTATUSEX status = { + .dwLength = sizeof(status), + }; + GlobalMemoryStatusEx(&status); + return status.ullTotalPhys; +} + /* Replacement for POSIX-2008 realpath(). Warning: partial functionality only * (resolved_path must be NULL). Also I highly doubt that GetFullPathName * really does the right thing under all circumstances. */ @@ -86,75 +100,99 @@ realpath(const wchar_t *path, wchar_t *resolved_path) ret = GetFullPathNameW(path, ret, resolved_path, NULL); if (!ret) { err = GetLastError(); - free(resolved_path); + FREE(resolved_path); resolved_path = NULL; goto fail_win32; } goto out; fail_win32: - errno = win32_error_to_errno(err); + set_errno_from_win32_error(err); out: return resolved_path; } -/* rename() on Windows fails if the destination file exists. And we need to - * make it work on wide characters. Fix it. */ +/* A quick hack to get reasonable rename() semantics on Windows, in particular + * deleting the destination file instead of failing with ERROR_FILE_EXISTS and + * working around any processes that may have the destination file open. + * + * Note: This is intended to be called when overwriting a regular file with an + * updated copy and is *not* a fully POSIX compliant rename(). For that you may + * wish to take a look at Cygwin's implementation, but be prepared... + * + * Return 0 on success, -1 on regular error, or 1 if the destination file was + * deleted but the source could not be renamed and therefore should not be + * deleted. + */ int -win32_rename_replacement(const wchar_t *oldpath, const wchar_t *newpath) +win32_rename_replacement(const wchar_t *srcpath, const wchar_t *dstpath) { - if (MoveFileExW(oldpath, newpath, MOVEFILE_REPLACE_EXISTING)) { - return 0; - } else { - set_errno_from_GetLastError(); - return -1; - } -} + wchar_t *tmpname; -/* Replacement for POSIX fnmatch() (partial functionality only) */ -int -fnmatch(const wchar_t *pattern, const wchar_t *string, int flags) -{ - if (PathMatchSpecW(string, pattern)) + /* Normally, MoveFileExW() with the MOVEFILE_REPLACE_EXISTING flag does + * what we want. */ + + if (MoveFileExW(srcpath, dstpath, MOVEFILE_REPLACE_EXISTING)) return 0; - else - return FNM_NOMATCH; -} -/* truncate() replacement */ -int -win32_truncate_replacement(const wchar_t *path, off_t size) -{ - DWORD err = NO_ERROR; - LARGE_INTEGER liOffset; + /* MoveFileExW() failed. One way this can happen is if any process has + * the destination file open, in which case ERROR_ACCESS_DENIED is + * produced. This can commonly happen if there is a backup or antivirus + * program monitoring or scanning the files. This behavior is very + * different from the behavior of POSIX rename(), which simply unlinks + * the destination file and allows other processes to keep it open! */ - HANDLE h = win32_open_existing_file(path, GENERIC_WRITE); - if (h == INVALID_HANDLE_VALUE) - goto fail; + if (GetLastError() != ERROR_ACCESS_DENIED) + goto err_set_errno; + + /* We can work around the above-mentioned problem by renaming the + * destination file to yet another temporary file, then "deleting" it, + * which on Windows will in fact not actually delete it immediately but + * rather mark it for deletion when the last handle to it is closed. */ + { + static const wchar_t orig_suffix[5] = L".orig"; + const size_t num_rand_chars = 9; + wchar_t *p; + + size_t dstlen = wcslen(dstpath); + + tmpname = alloca(sizeof(wchar_t) * + (dstlen + ARRAY_LEN(orig_suffix) + num_rand_chars + 1)); + 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); + p += num_rand_chars; + *p = L'\0'; + } - liOffset.QuadPart = size; - if (!SetFilePointerEx(h, liOffset, NULL, FILE_BEGIN)) - goto fail_close_handle; + if (!MoveFile(dstpath, tmpname)) + goto err_set_errno; + + if (!DeleteFile(tmpname)) { + set_errno_from_GetLastError(); + WARNING_WITH_ERRNO("Failed to delete original file " + "(moved to \"%ls\")", tmpname); + } + + if (!MoveFile(srcpath, dstpath)) { + set_errno_from_GetLastError(); + WARNING_WITH_ERRNO("Atomic semantics not respected in " + "failed rename() (new file is at \"%ls\")", + srcpath); + return 1; + } - 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(); - errno = win32_error_to_errno(err); +err_set_errno: + set_errno_from_GetLastError(); 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; @@ -232,64 +270,136 @@ pwrite(int fd, const void *buf, size_t count, off_t offset) return do_pread_or_pwrite(fd, (void*)buf, count, offset, true); } -/* Dumb Windows implementation of writev(). It writes the vectors one at a - * time. */ -ssize_t writev(int fd, const struct iovec *iov, int iovcnt) -{ - ssize_t total_bytes_written = 0; - - if (iovcnt <= 0) { - errno = EINVAL; - return -1; - } - for (int i = 0; i < iovcnt; i++) { - ssize_t bytes_written; - - bytes_written = write(fd, iov[i].iov_base, iov[i].iov_len); - if (bytes_written >= 0) - total_bytes_written += bytes_written; - if (bytes_written != iov[i].iov_len) { - if (total_bytes_written == 0) - total_bytes_written = -1; - break; - } - } - return total_bytes_written; -} - +/* Replacement for glob() in Windows native builds that operates on wide + * characters. */ int -win32_get_file_and_vol_ids(const wchar_t *path, u64 *ino_ret, u64 *dev_ret) +win32_wglob(const wchar_t *pattern, int flags, + int (*errfunc)(const wchar_t *epath, int eerrno), + glob_t *pglob) { - HANDLE hFile; + WIN32_FIND_DATAW dat; DWORD err; - BY_HANDLE_FILE_INFORMATION file_info; + HANDLE hFind; int ret; + size_t nspaces; + int errno_save; + + const wchar_t *backslash, *end_slash; + size_t prefix_len; - hFile = win32_open_existing_file(path, FILE_READ_ATTRIBUTES); - if (hFile == INVALID_HANDLE_VALUE) { + backslash = wcsrchr(pattern, L'\\'); + end_slash = wcsrchr(pattern, L'/'); + + if (backslash > end_slash) + end_slash = backslash; + + if (end_slash) + prefix_len = end_slash - pattern + 1; + else + prefix_len = 0; + + /* This function does not support all functionality of the POSIX glob(), + * so make sure the parameters are consistent with supported + * functionality. */ + wimlib_assert(errfunc == NULL); + wimlib_assert((flags & GLOB_ERR) == GLOB_ERR); + wimlib_assert((flags & ~(GLOB_NOSORT | GLOB_ERR)) == 0); + + hFind = FindFirstFileW(pattern, &dat); + if (hFind == INVALID_HANDLE_VALUE) { err = GetLastError(); - if (err != ERROR_FILE_NOT_FOUND) { - WARNING("Failed to open \"%ls\" to get file " - "and volume IDs", path); - win32_error(err); + if (err == ERROR_FILE_NOT_FOUND) { + errno = 0; + return GLOB_NOMATCH; + } else { + set_errno_from_win32_error(err); + return GLOB_ABORTED; } - return WIMLIB_ERR_OPEN; } + pglob->gl_pathc = 0; + pglob->gl_pathv = NULL; + nspaces = 0; + do { + wchar_t *path; + if (pglob->gl_pathc == nspaces) { + size_t new_nspaces; + wchar_t **pathv; + + new_nspaces = nspaces * 2 + 1; + pathv = REALLOC(pglob->gl_pathv, + new_nspaces * sizeof(pglob->gl_pathv[0])); + if (!pathv) + goto oom; + pglob->gl_pathv = pathv; + nspaces = new_nspaces; + } + size_t filename_len = wcslen(dat.cFileName); + size_t len_needed = prefix_len + filename_len; - if (!GetFileInformationByHandle(hFile, &file_info)) { - err = GetLastError(); - ERROR("Failed to get file information for \"%ls\"", path); - win32_error(err); - ret = WIMLIB_ERR_STAT; - } else { - *ino_ret = ((u64)file_info.nFileIndexHigh << 32) | - (u64)file_info.nFileIndexLow; - *dev_ret = file_info.dwVolumeSerialNumber; - ret = 0; + path = MALLOC((len_needed + 1) * sizeof(wchar_t)); + if (!path) + goto oom; + + wmemcpy(path, pattern, prefix_len); + wmemcpy(path + prefix_len, dat.cFileName, filename_len + 1); + pglob->gl_pathv[pglob->gl_pathc++] = path; + } while (FindNextFileW(hFind, &dat)); + err = GetLastError(); + CloseHandle(hFind); + if (err != ERROR_NO_MORE_FILES) { + set_errno_from_win32_error(err); + ret = GLOB_ABORTED; + goto fail_globfree; } - CloseHandle(hFile); + return 0; + +oom: + CloseHandle(hFind); + errno = ENOMEM; + ret = GLOB_NOSPACE; +fail_globfree: + errno_save = errno; + globfree(pglob); + errno = errno_save; return ret; } +void +globfree(glob_t *pglob) +{ + size_t i; + for (i = 0; i < pglob->gl_pathc; i++) + FREE(pglob->gl_pathv[i]); + 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; +} #endif /* __WIN32__ */