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Diffstat (limited to 'src/port/win32stat.c')
| -rw-r--r-- | src/port/win32stat.c | 189 |
1 files changed, 189 insertions, 0 deletions
diff --git a/src/port/win32stat.c b/src/port/win32stat.c new file mode 100644 index 0000000..e25811d --- /dev/null +++ b/src/port/win32stat.c @@ -0,0 +1,189 @@ +/*------------------------------------------------------------------------- + * + * win32stat.c + * Replacements for <sys/stat.h> functions using GetFileInformationByHandle + * + * Portions Copyright (c) 1996-2022, PostgreSQL Global Development Group + * Portions Copyright (c) 1994, Regents of the University of California + * + * + * IDENTIFICATION + * src/port/win32stat.c + * + *------------------------------------------------------------------------- + */ + +#ifdef WIN32 + +#include "c.h" +#include <windows.h> + +/* + * Convert a FILETIME struct into a 64 bit time_t. + */ +static __time64_t +filetime_to_time(const FILETIME *ft) +{ + ULARGE_INTEGER unified_ft = {0}; + static const uint64 EpochShift = UINT64CONST(116444736000000000); + + unified_ft.LowPart = ft->dwLowDateTime; + unified_ft.HighPart = ft->dwHighDateTime; + + if (unified_ft.QuadPart < EpochShift) + return -1; + + unified_ft.QuadPart -= EpochShift; + unified_ft.QuadPart /= 10 * 1000 * 1000; + + return unified_ft.QuadPart; +} + +/* + * Convert WIN32 file attributes to a Unix-style mode. + * + * Only owner permissions are set. + */ +static unsigned short +fileattr_to_unixmode(int attr) +{ + unsigned short uxmode = 0; + + uxmode |= (unsigned short) ((attr & FILE_ATTRIBUTE_DIRECTORY) ? + (_S_IFDIR) : (_S_IFREG)); + + uxmode |= (unsigned short) ((attr & FILE_ATTRIBUTE_READONLY) ? + (_S_IREAD) : (_S_IREAD | _S_IWRITE)); + + /* there is no need to simulate _S_IEXEC using CMD's PATHEXT extensions */ + uxmode |= _S_IEXEC; + + return uxmode; +} + +/* + * Convert WIN32 file information (from a HANDLE) to a struct stat. + */ +static int +fileinfo_to_stat(HANDLE hFile, struct stat *buf) +{ + BY_HANDLE_FILE_INFORMATION fiData; + + memset(buf, 0, sizeof(*buf)); + + /* + * GetFileInformationByHandle minimum supported version: Windows XP and + * Windows Server 2003, so it exists everywhere we care about. + */ + if (!GetFileInformationByHandle(hFile, &fiData)) + { + _dosmaperr(GetLastError()); + return -1; + } + + if (fiData.ftLastWriteTime.dwLowDateTime || + fiData.ftLastWriteTime.dwHighDateTime) + buf->st_mtime = filetime_to_time(&fiData.ftLastWriteTime); + + if (fiData.ftLastAccessTime.dwLowDateTime || + fiData.ftLastAccessTime.dwHighDateTime) + buf->st_atime = filetime_to_time(&fiData.ftLastAccessTime); + else + buf->st_atime = buf->st_mtime; + + if (fiData.ftCreationTime.dwLowDateTime || + fiData.ftCreationTime.dwHighDateTime) + buf->st_ctime = filetime_to_time(&fiData.ftCreationTime); + else + buf->st_ctime = buf->st_mtime; + + buf->st_mode = fileattr_to_unixmode(fiData.dwFileAttributes); + buf->st_nlink = fiData.nNumberOfLinks; + + buf->st_size = ((((uint64) fiData.nFileSizeHigh) << 32) | + fiData.nFileSizeLow); + + return 0; +} + +/* + * Windows implementation of stat(). + * + * This currently also implements lstat(), though perhaps that should change. + */ +int +_pgstat64(const char *name, struct stat *buf) +{ + /* + * Our open wrapper will report STATUS_DELETE_PENDING as ENOENT. We + * request FILE_FLAG_BACKUP_SEMANTICS so that we can open directories too, + * for limited purposes. We use the private handle-based version, so we + * don't risk running out of fds. + */ + HANDLE hFile; + int ret; + + hFile = pgwin32_open_handle(name, O_RDONLY, true); + if (hFile == INVALID_HANDLE_VALUE) + return -1; + + ret = fileinfo_to_stat(hFile, buf); + + CloseHandle(hFile); + return ret; +} + +/* + * Windows implementation of fstat(). + */ +int +_pgfstat64(int fileno, struct stat *buf) +{ + HANDLE hFile = (HANDLE) _get_osfhandle(fileno); + DWORD fileType = FILE_TYPE_UNKNOWN; + unsigned short st_mode; + + if (buf == NULL) + { + errno = EINVAL; + return -1; + } + + fileType = pgwin32_get_file_type(hFile); + if (errno != 0) + return -1; + + switch (fileType) + { + /* The specified file is a disk file */ + case FILE_TYPE_DISK: + return fileinfo_to_stat(hFile, buf); + + /* + * The specified file is a socket, a named pipe, or an anonymous + * pipe. + */ + case FILE_TYPE_PIPE: + st_mode = _S_IFIFO; + break; + /* The specified file is a character file */ + case FILE_TYPE_CHAR: + st_mode = _S_IFCHR; + break; + /* Unused flag and unknown file type */ + case FILE_TYPE_REMOTE: + case FILE_TYPE_UNKNOWN: + default: + errno = EINVAL; + return -1; + } + + memset(buf, 0, sizeof(*buf)); + buf->st_mode = st_mode; + buf->st_dev = fileno; + buf->st_rdev = fileno; + buf->st_nlink = 1; + return 0; +} + +#endif /* WIN32 */ |