From 026762dae39d6efcbfa99a18a15fdfeecbd5b9cc Mon Sep 17 00:00:00 2001 From: Thomas Munro Date: Thu, 9 Jan 2025 12:10:26 +1300 Subject: Provide 64-bit ftruncate() and lseek() on Windows. Change our ftruncate() macro to use the 64-bit variant of chsize(), and add a new macro to redirect lseek() to _lseeki64(). Back-patch to all supported releases, in preparation for a bug fix. Tested-by: Davinder Singh Discussion: https://postgr.es/m/CAKZiRmyM4YnokK6Oenw5JKwAQ3rhP0YTz2T-tiw5dAQjGRXE3Q%40mail.gmail.com --- src/include/port.h | 27 +++++++++++++++++++++++++++ 1 file changed, 27 insertions(+) (limited to 'src/include/port.h') diff --git a/src/include/port.h b/src/include/port.h index d2409a43e33..818b7c7baef 100644 --- a/src/include/port.h +++ b/src/include/port.h @@ -306,6 +306,33 @@ extern bool rmtree(const char *path, bool rmtopdir); #if defined(WIN32) && !defined(__CYGWIN__) +/* + * We want the 64-bit variant of lseek(). + * + * For Visual Studio, this must be after to avoid messing up its + * lseek() and _lseeki64() function declarations. + * + * For MinGW there is already a macro, so we have to undefine it (depending on + * _FILE_OFFSET_BITS, it may point at its own lseek64, but we don't want to + * count on that being set). + */ +#undef lseek +#define lseek(a,b,c) _lseeki64((a),(b),(c)) + +/* + * We want the 64-bit variant of chsize(). It sets errno and also returns it, + * so convert non-zero result to -1 to match POSIX. + * + * Prevent MinGW from declaring functions, and undefine its macro before we + * define our own. + */ +#ifndef _MSC_VER +#define FTRUNCATE_DEFINED +#include +#undef ftruncate +#endif +#define ftruncate(a,b) (_chsize_s((a),(b)) == 0 ? 0 : -1) + /* * open() and fopen() replacements to allow deletion of open files and * passing of other special options. -- cgit v1.2.3