From 311bcfc6b3acdd6fd152798c7f287ddf74fa2a98 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Tue, 16 Apr 2024 21:46:48 +0200 Subject: Adding upstream version 15.4. Signed-off-by: Daniel Baumann --- src/port/win32common.c | 68 ++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 68 insertions(+) create mode 100644 src/port/win32common.c (limited to 'src/port/win32common.c') diff --git a/src/port/win32common.c b/src/port/win32common.c new file mode 100644 index 0000000..2fd78f7 --- /dev/null +++ b/src/port/win32common.c @@ -0,0 +1,68 @@ +/*------------------------------------------------------------------------- + * + * win32common.c + * Common routines shared among the win32*.c ports. + * + * Portions Copyright (c) 1996-2023, PostgreSQL Global Development Group + * Portions Copyright (c) 1994, Regents of the University of California + * + * + * IDENTIFICATION + * src/port/win32common.c + * + *------------------------------------------------------------------------- + */ + +#ifdef FRONTEND +#include "postgres_fe.h" +#else +#include "postgres.h" +#endif + +#ifdef WIN32 + +/* + * pgwin32_get_file_type + * + * Convenience wrapper for GetFileType() with specific error handling for all the + * port implementations. Returns the file type associated with a HANDLE. + * + * On error, sets errno with FILE_TYPE_UNKNOWN as file type. + */ +DWORD +pgwin32_get_file_type(HANDLE hFile) +{ + DWORD fileType = FILE_TYPE_UNKNOWN; + DWORD lastError; + + errno = 0; + + /* + * When stdin, stdout, and stderr aren't associated with a stream the + * special value -2 is returned: + * https://learn.microsoft.com/en-us/cpp/c-runtime-library/reference/get-osfhandle + */ + if (hFile == INVALID_HANDLE_VALUE || hFile == (HANDLE) -2) + { + errno = EINVAL; + return FILE_TYPE_UNKNOWN; + } + + fileType = GetFileType(hFile); + lastError = GetLastError(); + + /* + * Invoke GetLastError in order to distinguish between a "valid" return of + * FILE_TYPE_UNKNOWN and its return due to a calling error. In case of + * success, GetLastError() returns NO_ERROR. + */ + if (fileType == FILE_TYPE_UNKNOWN && lastError != NO_ERROR) + { + _dosmaperr(lastError); + return FILE_TYPE_UNKNOWN; + } + + return fileType; +} + +#endif /* WIN32 */ -- cgit v1.2.3