* $Id$
*
* Written by Colin Peters <colin@bird.fu.is.saga-u.ac.jp>
- * Copyright (C) 1997-1999, 2001, 2003-2005, 2007, 2016, MinGW.org Project.
+ * Copyright (C) 1997-1999, 2001, 2003-2005, 2007, 2016, 2020,
+ * MinGW.org Project.
*
*
* Permission is hereby granted, free of charge, to any person obtaining a
*
*/
#ifndef _ERRNO_H
+#pragma GCC system_header
+
+/* Although ISO-C requires inclusion of <errno.h>, for all content
+ * provided herein, Microsoft contravenes this by assuming that the
+ * "errno" variable is also declared in <stdlib.h>; allow partial
+ * inclusion, to support this anomaly...
+ */
+#ifndef __STDLIB_H_SOURCED__
+/* ...defining the _ERRNO_H multiple inclusion guard, only when
+ * <errno.h> is included explicitl, other than by <stdlib.h>
+ */
#define _ERRNO_H
/* All MinGW headers are expected to include <_mingw.h>; however...
#include <_mingw.h>
#endif
-/* Error code numbers.
- *
- * TODO: Can't be sure of some of these assignments, I guessed from the
- * names given by strerror and the defines in the Cygnus errno.h. A lot
- * of the names from the Cygnus errno.h are not represented, and a few
- * of the descriptions returned by strerror do not obviously match
- * their error naming.
+/* Error code numbers -- these are as documented at
+ * https://docs.microsoft.com/en-us/cpp/c-runtime-library/
+ * errno-doserrno-sys-errlist-and-sys-nerr?view=vs-2019
*/
#define EPERM 1 /* Operation not permitted */
-#define ENOFILE 2 /* No such file or directory */
-#define ENOENT 2
+#define ENOENT 2 /* No such file or directory */
+#define ENOFILE 2 /* Microsoft legacy alias for ENOENT */
#define ESRCH 3 /* No such process */
#define EINTR 4 /* Interrupted function call */
#define EIO 5 /* Input/output error */
#define ENOMEM 12 /* Not enough space */
#define EACCES 13 /* Permission denied */
#define EFAULT 14 /* Bad address */
+
/* 15 - Unknown Error */
-#define EBUSY 16 /* strerror reports "Resource device" */
+
+#define EBUSY 16 /* Device or resource busy */
#define EEXIST 17 /* File exists */
-#define EXDEV 18 /* Improper link (cross-device link?) */
+#define EXDEV 18 /* Improper link (cross-device link) */
#define ENODEV 19 /* No such device */
#define ENOTDIR 20 /* Not a directory */
#define EISDIR 21 /* Is a directory */
+
+#endif /* !__STDLIB_H_SOURCED__ */
+/* Microsoft's non-standard _get_errno() and _set_errno(), which are
+ * declared in <stdlib.h>, and for which we provide in-line support on
+ * legacy Windows versions, (also in <stdlib.h>), demand exposure of
+ * EINVAL within <stdlib.h>, (for legacy support), regardless of the
+ * state of _ERRNO_H.
+ */
#define EINVAL 22 /* Invalid argument */
+
+#ifdef _ERRNO_H
+/* The remaining error codes are to be exposed only when <errno.h> has
+ * been included explicitly.
+ */
#define ENFILE 23 /* Too many open files in system */
#define EMFILE 24 /* Too many open files */
#define ENOTTY 25 /* Inappropriate I/O control operation */
+
/* 26 - Unknown Error */
+
#define EFBIG 27 /* File too large */
#define ENOSPC 28 /* No space left on device */
#define ESPIPE 29 /* Invalid seek (seek on a pipe?) */
#define EPIPE 32 /* Broken pipe */
#define EDOM 33 /* Domain error (math functions) */
#define ERANGE 34 /* Result too large (possibly too small) */
+
/* 35 - Unknown Error */
-#define EDEADLOCK 36 /* Resource deadlock avoided (non-Cyg) */
-#define EDEADLK 36
+
+#define EDEADLK 36 /* Resource deadlock avoided (non-Cyg) */
+#define EDEADLOCK 36 /* Microsoft legacy alias for EDEADLK */
+
/* 37 - Unknown Error */
+
#define ENAMETOOLONG 38 /* Filename too long (91 in Cyg?) */
#define ENOLCK 39 /* No locks available (46 in Cyg?) */
#define ENOSYS 40 /* Function not implemented (88 in Cyg?) */
#define ENOTEMPTY 41 /* Directory not empty (90 in Cyg?) */
#define EILSEQ 42 /* Illegal byte sequence */
+#endif /* _ERRNO_H */
+#if ! (defined _ERRNO_H && defined _STDLIB_H)
+/* ISO-C requires that the standard errno feature is defined here, in
+ * <errno.h>, but Microsoft require it to also be defined in <stdlib.h>;
+ * we expose it for inclusion of both <errno.h> and <stdlib.h>, but we
+ * process it once only.
+ */
+#if ! defined RC_INVOKED && ! defined __ASSEMBLER__
/* C language function prototype declarations are unnecessary, when
* compiling resource files, and they actually represent syntactically
* invalid statements, in preprocessed assembly language code.
*/
-#if ! defined RC_INVOKED && ! defined __ASSEMBLER__
-
_BEGIN_C_DECLS
-/* Definitions of errno. For _doserrno, sys_nerr and * sys_errlist, see
- * stdlib.h.
+/* Definitions of errno. For _doserrno, sys_nerr and * sys_errlist,
+ * see <stdlib.h>
*/
#ifdef _UWIN
#undef errno
_END_C_DECLS
#endif /* ! RC_INVOKED && !__ASSEMBLY__ */
+#endif /* ! (_ERRNO_H && _STDLIB_H) */
-#if defined __PTW32_H && ! defined _PTW32_ERRNO_H
+#if defined _ERRNO_H && defined __PTW32_H && ! defined _PTW32_ERRNO_H
/* As a courtesy to users of pthreads-win32, ensure that the appropriate
* additional error codes, as defined by that package, are automatically
* defined when <errno.h> is included AFTER any pthreads-win32 header; a
* $Id$
*
* Written by Colin Peters <colin@bird.fu.is.saga-u.ac.jp>
- * Copyright (C) 1997-2009, 2011, 2014-2016, 2018, MinGW.org Project.
+ * Copyright (C) 1997-2009, 2011, 2014-2016, 2018, 2020, MinGW.org Project.
*
*
* Permission is hereby granted, free of charge, to any person obtaining a
#endif /* __DECLSPEC_SUPPORTED */
#endif /* MB_CUR_MAX */
-/* FIXME: Nominally in <errno.h>, Microsoft likes to declare errno
- * in <stdlib.h> as well; we should factor this out.
+/* In MSVCR80.DLL, Microsoft introduced the following pair of errno
+ * accessor functions; they subsequently became available in MSVCRT.DLL
+ * from Vista onward. Although they are not required by ISO-C, and they
+ * are more cumbersome to use, than referring to errno directly, the GCC
+ * developers have gratuitously chosen to assume, in GCC-9.x, that they
+ * are always supported on MS-Windows, regardless of Windows version.
+ * Logically, we might expect these to be declared in <errno.h>, but
+ * Microsoft's documentation insists that they are actually declared
+ * here; thus, to satisfy the GCC-9.x requirement, we will declare
+ * them unconditionally here ...
*/
-#ifdef _UWIN
-# undef errno
- extern int errno;
-#else
-_CRTIMP __cdecl __MINGW_NOTHROW int *_errno(void);
-# define errno (*_errno())
+__cdecl __MINGW_NOTHROW int _get_errno(int *);
+__cdecl __MINGW_NOTHROW int _set_errno(int);
+
+/* ... then provide in-line implementations, (depending on gratuitous
+ * exposure of EINVAL, which strictly belongs in <errno.h> only, while
+ * also requiring declaring the ISO-C errno feature, which Microsoft
+ * documentation calls for both here, and in <errno.h>; we satisfy
+ * both of these requirements by selective <errno.h> inclusion).
+ */
+#define __STDLIB_H_SOURCED__ 1
+#include "errno.h"
+
+#if __MSVCRT_VERSION__ < __MSVCR80_DLL && _WIN32_WINNT < _WIN32_WINNT_VISTA
+/* These in-line implementations will support universal use of this API,
+ * even on legacy Windows versions pre-dating Vista, without requiring use
+ * of non-free MSVCRT80.DLL or later.
+ */
+__CRT_ALIAS __cdecl __MINGW_NOTHROW int _get_errno( int *__val )
+{ return (__val == NULL) ? (errno = EINVAL) : 0 & (*__val = errno); }
+
+__CRT_ALIAS __cdecl __MINGW_NOTHROW int _set_errno( int __val )
+{ errno = __val; return 0; }
+
#endif
+#undef __STDLIB_H_SOURCED__
+
_CRTIMP __cdecl __MINGW_NOTHROW int *__doserrno(void);
#define _doserrno (*__doserrno())
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