Remove __need macros from errno.h (__need_Emath, __need_error_t).

This is fairly complicated, not because the users of __need_Emath and
__need_error_t have complicated requirements, but because the core
changes had a lot of fallout.

__need_error_t exists for gnulib compatibility in argz.h and argp.h.
error_t itself is a Hurdism, an enum containing all the E-constants,
so you can do 'p (error_t) errno' in gdb and get a symbolic value.
argz.h and argp.h use it for function return values, and they want to
fall back to 'int' when that's not available.  There is no reason why
these nonstandard headers cannot just go ahead and include all of
errno.h; so we do that.

__need_Emath is defined only by .S files; what they _really_ need is
for errno.h to avoid declaring anything other than the E-constants
(e.g. 'extern int __errno_location(void);' is a syntax error in
assembly language). This is replaced with a check for __ASSEMBLER__ in
errno.h, plus a carefully documented requirement for bits/errno.h not
to define anything other than macros.  That in turn has the
consequence that bits/errno.h must not define errno - fortunately, all
live ports use the same definition of errno, so I've moved it to
errno.h.  The Hurd bits/errno.h must also take care not to define
error_t when __ASSEMBLER__ is defined, which involves repeating all of
the definitions twice, but it's a generated file so that's okay.

	* stdlib/errno.h: Remove __need_Emath and __need_error_t logic.
	Reorganize file.  Declare errno here.  When __ASSEMBLER__ is
	defined, don't declare anything other than the E-constants.

	* include/errno.h: Change conditional for exposing internal
	declarations to (not _ISOMAC and not __ASSEMBLER__).
	* bits/errno.h: Remove logic for __need_Emath.  Document
	requirements for a port-specific bits/errno.h.

	* sysdeps/unix/sysv/linux/bits/errno.h
	* sysdeps/unix/sysv/linux/alpha/bits/errno.h
	* sysdeps/unix/sysv/linux/hppa/bits/errno.h
	* sysdeps/unix/sysv/linux/mips/bits/errno.h
	* sysdeps/unix/sysv/linux/sparc/bits/errno.h:
	Add multiple-include guard and check against improper inclusion.
	Remove __need_Emath logic.  Don't declare errno here.  Ensure all
	constants are defined as simple integer literals.  Consistent
	formatting.
	* sysdeps/mach/hurd/errnos.awk: Likewise.  Only define error_t and
	enum __error_t_codes if __ASSEMBLER__ is not defined.
	* sysdeps/mach/hurd/bits/errno.h: Regenerate.

	* argp/argp.h, string/argz.h: Don't define __need_error_t before
	including errno.h.
	* sysdeps/i386/i686/fpu/multiarch/s_cosf-sse2.S
	* sysdeps/i386/i686/fpu/multiarch/s_sincosf-sse2.S
	* sysdeps/i386/i686/fpu/multiarch/s_sinf-sse2.S
	* sysdeps/x86_64/fpu/s_cosf.S
	* sysdeps/x86_64/fpu/s_sincosf.S
	* sysdeps/x86_64/fpu/s_sinf.S:
	Just include errno.h; don't define __need_Emath or include
	bits/errno.h directly.

2 files changed, 528 insertions, 385 deletions

diff --git a/sysdeps/mach/hurd/bits/errno.h b/sysdeps/mach/hurd/bits/errno.h
index d20ffe654a..f0a11af9ea 100644
--- a/sysdeps/mach/hurd/bits/errno.h
+++ b/sysdeps/mach/hurd/bits/errno.h
@@ -1,329 +1,418 @@
-/* This file generated by errnos.awk.  */
+/* This file generated by errnos.awk from
+     errno.texi
+     mach/message.h
+     mach/kern_return.h
+     mach/mig_errors.h
+     device/device_types.h
+   Do not edit this file; edit errnos.awk and regenerate it.  */
 
-/* The Hurd uses Mach error system 0x10, currently only subsystem 0. */
-#ifndef _HURD_ERRNO
-#define _HURD_ERRNO(n)	((0x10 << 26) | ((n) & 0x3fff))
+#ifndef _BITS_ERRNO_H
+#define _BITS_ERRNO_H 1
+
+#if !defined _ERRNO_H
+# error "Never include <bits/errno.h> directly; use <errno.h> instead."
 #endif
 
-#ifdef _ERRNO_H
+#ifndef __ASSEMBLER__
 
 enum __error_t_codes
 {
-	/* The value zero always means success and it is perfectly fine for
-	   code to use 0 explicitly (or implicitly, e.g. via Boolean coercion).
-	   Having an enum entry for zero both makes the debugger print the name
-	   for error_t-typed zero values, and prevents the compiler from
-	   issuing warnings about 'case 0:' in a switch on an error_t-typed
-	   value.  */
-	ESUCCESS = 0,
+  /* The value zero always means success and it is perfectly fine
+     for code to use 0 explicitly (or implicitly, e.g. via Boolean
+     coercion.)  Having an enum entry for zero both makes the
+     debugger print the name for error_t-typed zero values, and
+     prevents the compiler from issuing warnings about 'case 0:'
+     in a switch on an error_t-typed value.  */
+  ESUCCESS                       = 0,
 
-#undef EDOM
-#undef ERANGE
-	EPERM           = _HURD_ERRNO (1),
-#define	EPERM           _HURD_ERRNO (1) /* Operation not permitted */
-	ENOENT          = _HURD_ERRNO (2),
-#define	ENOENT          _HURD_ERRNO (2) /* No such file or directory */
-	ESRCH           = _HURD_ERRNO (3),
-#define	ESRCH           _HURD_ERRNO (3) /* No such process */
-	EINTR           = _HURD_ERRNO (4),
-#define	EINTR           _HURD_ERRNO (4) /* Interrupted system call */
-	EIO             = _HURD_ERRNO (5),
-#define	EIO             _HURD_ERRNO (5) /* Input/output error */
-	ENXIO           = _HURD_ERRNO (6),
-#define	ENXIO           _HURD_ERRNO (6) /* No such device or address */
-	E2BIG           = _HURD_ERRNO (7),
-#define	E2BIG           _HURD_ERRNO (7) /* Argument list too long */
-	ENOEXEC         = _HURD_ERRNO (8),
-#define	ENOEXEC         _HURD_ERRNO (8) /* Exec format error */
-	EBADF           = _HURD_ERRNO (9),
-#define	EBADF           _HURD_ERRNO (9) /* Bad file descriptor */
-	ECHILD          = _HURD_ERRNO (10),
-#define	ECHILD          _HURD_ERRNO (10)/* No child processes */
-	EDEADLK         = _HURD_ERRNO (11),
-#define	EDEADLK         _HURD_ERRNO (11)/* Resource deadlock avoided */
-	ENOMEM          = _HURD_ERRNO (12),
-#define	ENOMEM          _HURD_ERRNO (12)/* Cannot allocate memory */
-	EACCES          = _HURD_ERRNO (13),
-#define	EACCES          _HURD_ERRNO (13)/* Permission denied */
-	EFAULT          = _HURD_ERRNO (14),
-#define	EFAULT          _HURD_ERRNO (14)/* Bad address */
-	ENOTBLK         = _HURD_ERRNO (15),
-#define	ENOTBLK         _HURD_ERRNO (15)/* Block device required */
-	EBUSY           = _HURD_ERRNO (16),
-#define	EBUSY           _HURD_ERRNO (16)/* Device or resource busy */
-	EEXIST          = _HURD_ERRNO (17),
-#define	EEXIST          _HURD_ERRNO (17)/* File exists */
-	EXDEV           = _HURD_ERRNO (18),
-#define	EXDEV           _HURD_ERRNO (18)/* Invalid cross-device link */
-	ENODEV          = _HURD_ERRNO (19),
-#define	ENODEV          _HURD_ERRNO (19)/* No such device */
-	ENOTDIR         = _HURD_ERRNO (20),
-#define	ENOTDIR         _HURD_ERRNO (20)/* Not a directory */
-	EISDIR          = _HURD_ERRNO (21),
-#define	EISDIR          _HURD_ERRNO (21)/* Is a directory */
-	EINVAL          = _HURD_ERRNO (22),
-#define	EINVAL          _HURD_ERRNO (22)/* Invalid argument */
-	EMFILE          = _HURD_ERRNO (24),
-#define	EMFILE          _HURD_ERRNO (24)/* Too many open files */
-	ENFILE          = _HURD_ERRNO (23),
-#define	ENFILE          _HURD_ERRNO (23)/* Too many open files in system */
-	ENOTTY          = _HURD_ERRNO (25),
-#define	ENOTTY          _HURD_ERRNO (25)/* Inappropriate ioctl for device */
-	ETXTBSY         = _HURD_ERRNO (26),
-#define	ETXTBSY         _HURD_ERRNO (26)/* Text file busy */
-	EFBIG           = _HURD_ERRNO (27),
-#define	EFBIG           _HURD_ERRNO (27)/* File too large */
-	ENOSPC          = _HURD_ERRNO (28),
-#define	ENOSPC          _HURD_ERRNO (28)/* No space left on device */
-	ESPIPE          = _HURD_ERRNO (29),
-#define	ESPIPE          _HURD_ERRNO (29)/* Illegal seek */
-	EROFS           = _HURD_ERRNO (30),
-#define	EROFS           _HURD_ERRNO (30)/* Read-only file system */
-	EMLINK          = _HURD_ERRNO (31),
-#define	EMLINK          _HURD_ERRNO (31)/* Too many links */
-	EPIPE           = _HURD_ERRNO (32),
-#define	EPIPE           _HURD_ERRNO (32)/* Broken pipe */
-	EDOM            = _HURD_ERRNO (33),
-#define	EDOM            _HURD_ERRNO (33)/* Numerical argument out of domain */
-	ERANGE          = _HURD_ERRNO (34),
-#define	ERANGE          _HURD_ERRNO (34)/* Numerical result out of range */
-	EAGAIN          = _HURD_ERRNO (35),
-#define	EAGAIN          _HURD_ERRNO (35)/* Resource temporarily unavailable */
-#define EWOULDBLOCK EAGAIN /* Operation would block */
-	EINPROGRESS     = _HURD_ERRNO (36),
-#define	EINPROGRESS     _HURD_ERRNO (36)/* Operation now in progress */
-	EALREADY        = _HURD_ERRNO (37),
-#define	EALREADY        _HURD_ERRNO (37)/* Operation already in progress */
-	ENOTSOCK        = _HURD_ERRNO (38),
-#define	ENOTSOCK        _HURD_ERRNO (38)/* Socket operation on non-socket */
-	EMSGSIZE        = _HURD_ERRNO (40),
-#define	EMSGSIZE        _HURD_ERRNO (40)/* Message too long */
-	EPROTOTYPE      = _HURD_ERRNO (41),
-#define	EPROTOTYPE      _HURD_ERRNO (41)/* Protocol wrong type for socket */
-	ENOPROTOOPT     = _HURD_ERRNO (42),
-#define	ENOPROTOOPT     _HURD_ERRNO (42)/* Protocol not available */
-	EPROTONOSUPPORT = _HURD_ERRNO (43),
-#define	EPROTONOSUPPORT _HURD_ERRNO (43)/* Protocol not supported */
-	ESOCKTNOSUPPORT = _HURD_ERRNO (44),
-#define	ESOCKTNOSUPPORT _HURD_ERRNO (44)/* Socket type not supported */
-	EOPNOTSUPP      = _HURD_ERRNO (45),
-#define	EOPNOTSUPP      _HURD_ERRNO (45)/* Operation not supported */
-	EPFNOSUPPORT    = _HURD_ERRNO (46),
-#define	EPFNOSUPPORT    _HURD_ERRNO (46)/* Protocol family not supported */
-	EAFNOSUPPORT    = _HURD_ERRNO (47),
-#define	EAFNOSUPPORT    _HURD_ERRNO (47)/* Address family not supported by protocol */
-	EADDRINUSE      = _HURD_ERRNO (48),
-#define	EADDRINUSE      _HURD_ERRNO (48)/* Address already in use */
-	EADDRNOTAVAIL   = _HURD_ERRNO (49),
-#define	EADDRNOTAVAIL   _HURD_ERRNO (49)/* Cannot assign requested address */
-	ENETDOWN        = _HURD_ERRNO (50),
-#define	ENETDOWN        _HURD_ERRNO (50)/* Network is down */
-	ENETUNREACH     = _HURD_ERRNO (51),
-#define	ENETUNREACH     _HURD_ERRNO (51)/* Network is unreachable */
-	ENETRESET       = _HURD_ERRNO (52),
-#define	ENETRESET       _HURD_ERRNO (52)/* Network dropped connection on reset */
-	ECONNABORTED    = _HURD_ERRNO (53),
-#define	ECONNABORTED    _HURD_ERRNO (53)/* Software caused connection abort */
-	ECONNRESET      = _HURD_ERRNO (54),
-#define	ECONNRESET      _HURD_ERRNO (54)/* Connection reset by peer */
-	ENOBUFS         = _HURD_ERRNO (55),
-#define	ENOBUFS         _HURD_ERRNO (55)/* No buffer space available */
-	EISCONN         = _HURD_ERRNO (56),
-#define	EISCONN         _HURD_ERRNO (56)/* Transport endpoint is already connected */
-	ENOTCONN        = _HURD_ERRNO (57),
-#define	ENOTCONN        _HURD_ERRNO (57)/* Transport endpoint is not connected */
-	EDESTADDRREQ    = _HURD_ERRNO (39),
-#define	EDESTADDRREQ    _HURD_ERRNO (39)/* Destination address required */
-	ESHUTDOWN       = _HURD_ERRNO (58),
-#define	ESHUTDOWN       _HURD_ERRNO (58)/* Cannot send after transport endpoint shutdown */
-	ETOOMANYREFS    = _HURD_ERRNO (59),
-#define	ETOOMANYREFS    _HURD_ERRNO (59)/* Too many references: cannot splice */
-	ETIMEDOUT       = _HURD_ERRNO (60),
-#define	ETIMEDOUT       _HURD_ERRNO (60)/* Connection timed out */
-	ECONNREFUSED    = _HURD_ERRNO (61),
-#define	ECONNREFUSED    _HURD_ERRNO (61)/* Connection refused */
-	ELOOP           = _HURD_ERRNO (62),
-#define	ELOOP           _HURD_ERRNO (62)/* Too many levels of symbolic links */
-	ENAMETOOLONG    = _HURD_ERRNO (63),
-#define	ENAMETOOLONG    _HURD_ERRNO (63)/* File name too long */
-	EHOSTDOWN       = _HURD_ERRNO (64),
-#define	EHOSTDOWN       _HURD_ERRNO (64)/* Host is down */
-	EHOSTUNREACH    = _HURD_ERRNO (65),
-#define	EHOSTUNREACH    _HURD_ERRNO (65)/* No route to host */
-	ENOTEMPTY       = _HURD_ERRNO (66),
-#define	ENOTEMPTY       _HURD_ERRNO (66)/* Directory not empty */
-	EPROCLIM        = _HURD_ERRNO (67),
-#define	EPROCLIM        _HURD_ERRNO (67)/* Too many processes */
-	EUSERS          = _HURD_ERRNO (68),
-#define	EUSERS          _HURD_ERRNO (68)/* Too many users */
-	EDQUOT          = _HURD_ERRNO (69),
-#define	EDQUOT          _HURD_ERRNO (69)/* Disk quota exceeded */
-	ESTALE          = _HURD_ERRNO (70),
-#define	ESTALE          _HURD_ERRNO (70)/* Stale file handle */
-	EREMOTE         = _HURD_ERRNO (71),
-#define	EREMOTE         _HURD_ERRNO (71)/* Object is remote */
-	EBADRPC         = _HURD_ERRNO (72),
-#define	EBADRPC         _HURD_ERRNO (72)/* RPC struct is bad */
-	ERPCMISMATCH    = _HURD_ERRNO (73),
-#define	ERPCMISMATCH    _HURD_ERRNO (73)/* RPC version wrong */
-	EPROGUNAVAIL    = _HURD_ERRNO (74),
-#define	EPROGUNAVAIL    _HURD_ERRNO (74)/* RPC program not available */
-	EPROGMISMATCH   = _HURD_ERRNO (75),
-#define	EPROGMISMATCH   _HURD_ERRNO (75)/* RPC program version wrong */
-	EPROCUNAVAIL    = _HURD_ERRNO (76),
-#define	EPROCUNAVAIL    _HURD_ERRNO (76)/* RPC bad procedure for program */
-	ENOLCK          = _HURD_ERRNO (77),
-#define	ENOLCK          _HURD_ERRNO (77)/* No locks available */
-	EFTYPE          = _HURD_ERRNO (79),
-#define	EFTYPE          _HURD_ERRNO (79)/* Inappropriate file type or format */
-	EAUTH           = _HURD_ERRNO (80),
-#define	EAUTH           _HURD_ERRNO (80)/* Authentication error */
-	ENEEDAUTH       = _HURD_ERRNO (81),
-#define	ENEEDAUTH       _HURD_ERRNO (81)/* Need authenticator */
-	ENOSYS          = _HURD_ERRNO (78),
-#define	ENOSYS          _HURD_ERRNO (78)/* Function not implemented */
-	ENOTSUP         = _HURD_ERRNO (118),
-#define	ENOTSUP         _HURD_ERRNO (118)/* Not supported */
-	EILSEQ          = _HURD_ERRNO (106),
-#define	EILSEQ          _HURD_ERRNO (106)/* Invalid or incomplete multibyte or wide character */
-	EBACKGROUND     = _HURD_ERRNO (100),
-#define	EBACKGROUND     _HURD_ERRNO (100)/* Inappropriate operation for background process */
-	EDIED           = _HURD_ERRNO (101),
-#define	EDIED           _HURD_ERRNO (101)/* Translator died */
-	ED              = _HURD_ERRNO (102),
-#define	ED              _HURD_ERRNO (102)/* ? */
-	EGREGIOUS       = _HURD_ERRNO (103),
-#define	EGREGIOUS       _HURD_ERRNO (103)/* You really blew it this time */
-	EIEIO           = _HURD_ERRNO (104),
-#define	EIEIO           _HURD_ERRNO (104)/* Computer bought the farm */
-	EGRATUITOUS     = _HURD_ERRNO (105),
-#define	EGRATUITOUS     _HURD_ERRNO (105)/* Gratuitous error */
-	EBADMSG         = _HURD_ERRNO (107),
-#define	EBADMSG         _HURD_ERRNO (107)/* Bad message */
-	EIDRM           = _HURD_ERRNO (108),
-#define	EIDRM           _HURD_ERRNO (108)/* Identifier removed */
-	EMULTIHOP       = _HURD_ERRNO (109),
-#define	EMULTIHOP       _HURD_ERRNO (109)/* Multihop attempted */
-	ENODATA         = _HURD_ERRNO (110),
-#define	ENODATA         _HURD_ERRNO (110)/* No data available */
-	ENOLINK         = _HURD_ERRNO (111),
-#define	ENOLINK         _HURD_ERRNO (111)/* Link has been severed */
-	ENOMSG          = _HURD_ERRNO (112),
-#define	ENOMSG          _HURD_ERRNO (112)/* No message of desired type */
-	ENOSR           = _HURD_ERRNO (113),
-#define	ENOSR           _HURD_ERRNO (113)/* Out of streams resources */
-	ENOSTR          = _HURD_ERRNO (114),
-#define	ENOSTR          _HURD_ERRNO (114)/* Device not a stream */
-	EOVERFLOW       = _HURD_ERRNO (115),
-#define	EOVERFLOW       _HURD_ERRNO (115)/* Value too large for defined data type */
-	EPROTO          = _HURD_ERRNO (116),
-#define	EPROTO          _HURD_ERRNO (116)/* Protocol error */
-	ETIME           = _HURD_ERRNO (117),
-#define	ETIME           _HURD_ERRNO (117)/* Timer expired */
-	ECANCELED       = _HURD_ERRNO (119),
-#define	ECANCELED       _HURD_ERRNO (119)/* Operation canceled */
+  /* The Hurd uses Mach error system 0x10, subsystem 0. */
+  EPERM                          = 0x40000001,	/* Operation not permitted */
+  ENOENT                         = 0x40000002,	/* No such file or directory */
+  ESRCH                          = 0x40000003,	/* No such process */
+  EINTR                          = 0x40000004,	/* Interrupted system call */
+  EIO                            = 0x40000005,	/* Input/output error */
+  ENXIO                          = 0x40000006,	/* No such device or address */
+  E2BIG                          = 0x40000007,	/* Argument list too long */
+  ENOEXEC                        = 0x40000008,	/* Exec format error */
+  EBADF                          = 0x40000009,	/* Bad file descriptor */
+  ECHILD                         = 0x4000000a,	/* No child processes */
+  EDEADLK                        = 0x4000000b,	/* Resource deadlock avoided */
+  ENOMEM                         = 0x4000000c,	/* Cannot allocate memory */
+  EACCES                         = 0x4000000d,	/* Permission denied */
+  EFAULT                         = 0x4000000e,	/* Bad address */
+  ENOTBLK                        = 0x4000000f,	/* Block device required */
+  EBUSY                          = 0x40000010,	/* Device or resource busy */
+  EEXIST                         = 0x40000011,	/* File exists */
+  EXDEV                          = 0x40000012,	/* Invalid cross-device link */
+  ENODEV                         = 0x40000013,	/* No such device */
+  ENOTDIR                        = 0x40000014,	/* Not a directory */
+  EISDIR                         = 0x40000015,	/* Is a directory */
+  EINVAL                         = 0x40000016,	/* Invalid argument */
+  EMFILE                         = 0x40000018,	/* Too many open files */
+  ENFILE                         = 0x40000017,	/* Too many open files in system */
+  ENOTTY                         = 0x40000019,	/* Inappropriate ioctl for device */
+  ETXTBSY                        = 0x4000001a,	/* Text file busy */
+  EFBIG                          = 0x4000001b,	/* File too large */
+  ENOSPC                         = 0x4000001c,	/* No space left on device */
+  ESPIPE                         = 0x4000001d,	/* Illegal seek */
+  EROFS                          = 0x4000001e,	/* Read-only file system */
+  EMLINK                         = 0x4000001f,	/* Too many links */
+  EPIPE                          = 0x40000020,	/* Broken pipe */
+  EDOM                           = 0x40000021,	/* Numerical argument out of domain */
+  ERANGE                         = 0x40000022,	/* Numerical result out of range */
+  EAGAIN                         = 0x40000023,	/* Resource temporarily unavailable */
+  EINPROGRESS                    = 0x40000024,	/* Operation now in progress */
+  EALREADY                       = 0x40000025,	/* Operation already in progress */
+  ENOTSOCK                       = 0x40000026,	/* Socket operation on non-socket */
+  EMSGSIZE                       = 0x40000028,	/* Message too long */
+  EPROTOTYPE                     = 0x40000029,	/* Protocol wrong type for socket */
+  ENOPROTOOPT                    = 0x4000002a,	/* Protocol not available */
+  EPROTONOSUPPORT                = 0x4000002b,	/* Protocol not supported */
+  ESOCKTNOSUPPORT                = 0x4000002c,	/* Socket type not supported */
+  EOPNOTSUPP                     = 0x4000002d,	/* Operation not supported */
+  EPFNOSUPPORT                   = 0x4000002e,	/* Protocol family not supported */
+  EAFNOSUPPORT                   = 0x4000002f,	/* Address family not supported by protocol */
+  EADDRINUSE                     = 0x40000030,	/* Address already in use */
+  EADDRNOTAVAIL                  = 0x40000031,	/* Cannot assign requested address */
+  ENETDOWN                       = 0x40000032,	/* Network is down */
+  ENETUNREACH                    = 0x40000033,	/* Network is unreachable */
+  ENETRESET                      = 0x40000034,	/* Network dropped connection on reset */
+  ECONNABORTED                   = 0x40000035,	/* Software caused connection abort */
+  ECONNRESET                     = 0x40000036,	/* Connection reset by peer */
+  ENOBUFS                        = 0x40000037,	/* No buffer space available */
+  EISCONN                        = 0x40000038,	/* Transport endpoint is already connected */
+  ENOTCONN                       = 0x40000039,	/* Transport endpoint is not connected */
+  EDESTADDRREQ                   = 0x40000027,	/* Destination address required */
+  ESHUTDOWN                      = 0x4000003a,	/* Cannot send after transport endpoint shutdown */
+  ETOOMANYREFS                   = 0x4000003b,	/* Too many references: cannot splice */
+  ETIMEDOUT                      = 0x4000003c,	/* Connection timed out */
+  ECONNREFUSED                   = 0x4000003d,	/* Connection refused */
+  ELOOP                          = 0x4000003e,	/* Too many levels of symbolic links */
+  ENAMETOOLONG                   = 0x4000003f,	/* File name too long */
+  EHOSTDOWN                      = 0x40000040,	/* Host is down */
+  EHOSTUNREACH                   = 0x40000041,	/* No route to host */
+  ENOTEMPTY                      = 0x40000042,	/* Directory not empty */
+  EPROCLIM                       = 0x40000043,	/* Too many processes */
+  EUSERS                         = 0x40000044,	/* Too many users */
+  EDQUOT                         = 0x40000045,	/* Disk quota exceeded */
+  ESTALE                         = 0x40000046,	/* Stale file handle */
+  EREMOTE                        = 0x40000047,	/* Object is remote */
+  EBADRPC                        = 0x40000048,	/* RPC struct is bad */
+  ERPCMISMATCH                   = 0x40000049,	/* RPC version wrong */
+  EPROGUNAVAIL                   = 0x4000004a,	/* RPC program not available */
+  EPROGMISMATCH                  = 0x4000004b,	/* RPC program version wrong */
+  EPROCUNAVAIL                   = 0x4000004c,	/* RPC bad procedure for program */
+  ENOLCK                         = 0x4000004d,	/* No locks available */
+  EFTYPE                         = 0x4000004f,	/* Inappropriate file type or format */
+  EAUTH                          = 0x40000050,	/* Authentication error */
+  ENEEDAUTH                      = 0x40000051,	/* Need authenticator */
+  ENOSYS                         = 0x4000004e,	/* Function not implemented */
+  ENOTSUP                        = 0x40000076,	/* Not supported */
+  EILSEQ                         = 0x4000006a,	/* Invalid or incomplete multibyte or wide character */
+  EBACKGROUND                    = 0x40000064,	/* Inappropriate operation for background process */
+  EDIED                          = 0x40000065,	/* Translator died */
+  ED                             = 0x40000066,	/* ? */
+  EGREGIOUS                      = 0x40000067,	/* You really blew it this time */
+  EIEIO                          = 0x40000068,	/* Computer bought the farm */
+  EGRATUITOUS                    = 0x40000069,	/* Gratuitous error */
+  EBADMSG                        = 0x4000006b,	/* Bad message */
+  EIDRM                          = 0x4000006c,	/* Identifier removed */
+  EMULTIHOP                      = 0x4000006d,	/* Multihop attempted */
+  ENODATA                        = 0x4000006e,	/* No data available */
+  ENOLINK                        = 0x4000006f,	/* Link has been severed */
+  ENOMSG                         = 0x40000070,	/* No message of desired type */
+  ENOSR                          = 0x40000071,	/* Out of streams resources */
+  ENOSTR                         = 0x40000072,	/* Device not a stream */
+  EOVERFLOW                      = 0x40000073,	/* Value too large for defined data type */
+  EPROTO                         = 0x40000074,	/* Protocol error */
+  ETIME                          = 0x40000075,	/* Timer expired */
+  ECANCELED                      = 0x40000077,	/* Operation canceled */
 
-	/* Errors from <mach/message.h>.  */
-	EMACH_SEND_IN_PROGRESS          = 0x10000001,
-	EMACH_SEND_INVALID_DATA         = 0x10000002,
-	EMACH_SEND_INVALID_DEST         = 0x10000003,
-	EMACH_SEND_TIMED_OUT            = 0x10000004,
-	EMACH_SEND_WILL_NOTIFY          = 0x10000005,
-	EMACH_SEND_NOTIFY_IN_PROGRESS   = 0x10000006,
-	EMACH_SEND_INTERRUPTED          = 0x10000007,
-	EMACH_SEND_MSG_TOO_SMALL        = 0x10000008,
-	EMACH_SEND_INVALID_REPLY        = 0x10000009,
-	EMACH_SEND_INVALID_RIGHT        = 0x1000000a,
-	EMACH_SEND_INVALID_NOTIFY       = 0x1000000b,
-	EMACH_SEND_INVALID_MEMORY       = 0x1000000c,
-	EMACH_SEND_NO_BUFFER            = 0x1000000d,
-	EMACH_SEND_NO_NOTIFY            = 0x1000000e,
-	EMACH_SEND_INVALID_TYPE         = 0x1000000f,
-	EMACH_SEND_INVALID_HEADER       = 0x10000010,
-	EMACH_RCV_IN_PROGRESS           = 0x10004001,
-	EMACH_RCV_INVALID_NAME          = 0x10004002,
-	EMACH_RCV_TIMED_OUT             = 0x10004003,
-	EMACH_RCV_TOO_LARGE             = 0x10004004,
-	EMACH_RCV_INTERRUPTED           = 0x10004005,
-	EMACH_RCV_PORT_CHANGED          = 0x10004006,
-	EMACH_RCV_INVALID_NOTIFY        = 0x10004007,
-	EMACH_RCV_INVALID_DATA          = 0x10004008,
-	EMACH_RCV_PORT_DIED             = 0x10004009,
-	EMACH_RCV_IN_SET                = 0x1000400a,
-	EMACH_RCV_HEADER_ERROR          = 0x1000400b,
-	EMACH_RCV_BODY_ERROR            = 0x1000400c,
+/* Errors from <mach/message.h>.  */
+  EMACH_SEND_IN_PROGRESS         = 0x10000001,
+  EMACH_SEND_INVALID_DATA        = 0x10000002,
+  EMACH_SEND_INVALID_DEST        = 0x10000003,
+  EMACH_SEND_TIMED_OUT           = 0x10000004,
+  EMACH_SEND_WILL_NOTIFY         = 0x10000005,
+  EMACH_SEND_NOTIFY_IN_PROGRESS  = 0x10000006,
+  EMACH_SEND_INTERRUPTED         = 0x10000007,
+  EMACH_SEND_MSG_TOO_SMALL       = 0x10000008,
+  EMACH_SEND_INVALID_REPLY       = 0x10000009,
+  EMACH_SEND_INVALID_RIGHT       = 0x1000000a,
+  EMACH_SEND_INVALID_NOTIFY      = 0x1000000b,
+  EMACH_SEND_INVALID_MEMORY      = 0x1000000c,
+  EMACH_SEND_NO_BUFFER           = 0x1000000d,
+  EMACH_SEND_NO_NOTIFY           = 0x1000000e,
+  EMACH_SEND_INVALID_TYPE        = 0x1000000f,
+  EMACH_SEND_INVALID_HEADER      = 0x10000010,
+  EMACH_RCV_IN_PROGRESS          = 0x10004001,
+  EMACH_RCV_INVALID_NAME         = 0x10004002,
+  EMACH_RCV_TIMED_OUT            = 0x10004003,
+  EMACH_RCV_TOO_LARGE            = 0x10004004,
+  EMACH_RCV_INTERRUPTED          = 0x10004005,
+  EMACH_RCV_PORT_CHANGED         = 0x10004006,
+  EMACH_RCV_INVALID_NOTIFY       = 0x10004007,
+  EMACH_RCV_INVALID_DATA         = 0x10004008,
+  EMACH_RCV_PORT_DIED            = 0x10004009,
+  EMACH_RCV_IN_SET               = 0x1000400a,
+  EMACH_RCV_HEADER_ERROR         = 0x1000400b,
+  EMACH_RCV_BODY_ERROR           = 0x1000400c,
 
-	/* Errors from <mach/kern_return.h>.  */
-	EKERN_INVALID_ADDRESS           = 1,
-	EKERN_PROTECTION_FAILURE        = 2,
-	EKERN_NO_SPACE                  = 3,
-	EKERN_INVALID_ARGUMENT          = 4,
-	EKERN_FAILURE                   = 5,
-	EKERN_RESOURCE_SHORTAGE         = 6,
-	EKERN_NOT_RECEIVER              = 7,
-	EKERN_NO_ACCESS                 = 8,
-	EKERN_MEMORY_FAILURE            = 9,
-	EKERN_MEMORY_ERROR              = 10,
-	EKERN_NOT_IN_SET                = 12,
-	EKERN_NAME_EXISTS               = 13,
-	EKERN_ABORTED                   = 14,
-	EKERN_INVALID_NAME              = 15,
-	EKERN_INVALID_TASK              = 16,
-	EKERN_INVALID_RIGHT             = 17,
-	EKERN_INVALID_VALUE             = 18,
-	EKERN_UREFS_OVERFLOW            = 19,
-	EKERN_INVALID_CAPABILITY        = 20,
-	EKERN_RIGHT_EXISTS              = 21,
-	EKERN_INVALID_HOST              = 22,
-	EKERN_MEMORY_PRESENT            = 23,
-	EKERN_WRITE_PROTECTION_FAILURE  = 24,
-	EKERN_TERMINATED                = 26,
+/* Errors from <mach/kern_return.h>.  */
+  EKERN_INVALID_ADDRESS          = 1,
+  EKERN_PROTECTION_FAILURE       = 2,
+  EKERN_NO_SPACE                 = 3,
+  EKERN_INVALID_ARGUMENT         = 4,
+  EKERN_FAILURE                  = 5,
+  EKERN_RESOURCE_SHORTAGE        = 6,
+  EKERN_NOT_RECEIVER             = 7,
+  EKERN_NO_ACCESS                = 8,
+  EKERN_MEMORY_FAILURE           = 9,
+  EKERN_MEMORY_ERROR             = 10,
+  EKERN_NOT_IN_SET               = 12,
+  EKERN_NAME_EXISTS              = 13,
+  EKERN_ABORTED                  = 14,
+  EKERN_INVALID_NAME             = 15,
+  EKERN_INVALID_TASK             = 16,
+  EKERN_INVALID_RIGHT            = 17,
+  EKERN_INVALID_VALUE            = 18,
+  EKERN_UREFS_OVERFLOW           = 19,
+  EKERN_INVALID_CAPABILITY       = 20,
+  EKERN_RIGHT_EXISTS             = 21,
+  EKERN_INVALID_HOST             = 22,
+  EKERN_MEMORY_PRESENT           = 23,
+  EKERN_WRITE_PROTECTION_FAILURE = 24,
+  EKERN_TERMINATED               = 26,
+  EKERN_TIMEDOUT                 = 27,
+  EKERN_INTERRUPTED              = 28,
 
-	/* Errors from <mach/mig_errors.h>.  */
-	EMIG_TYPE_ERROR         = -300  /* client type check failure */,
-	EMIG_REPLY_MISMATCH     = -301  /* wrong reply message ID */,
-	EMIG_REMOTE_ERROR       = -302  /* server detected error */,
-	EMIG_BAD_ID             = -303  /* bad request message ID */,
-	EMIG_BAD_ARGUMENTS      = -304  /* server type check failure */,
-	EMIG_NO_REPLY           = -305  /* no reply should be sent */,
-	EMIG_EXCEPTION          = -306  /* server raised exception */,
-	EMIG_ARRAY_TOO_LARGE    = -307  /* array not large enough */,
-	EMIG_SERVER_DIED        = -308  /* server died */,
-	EMIG_DESTROY_REQUEST    = -309  /* destroy request with no reply */,
+/* Errors from <mach/mig_errors.h>.  */
+  EMIG_TYPE_ERROR                = -300,	/* client type check failure */
+  EMIG_REPLY_MISMATCH            = -301,	/* wrong reply message ID */
+  EMIG_REMOTE_ERROR              = -302,	/* server detected error */
+  EMIG_BAD_ID                    = -303,	/* bad request message ID */
+  EMIG_BAD_ARGUMENTS             = -304,	/* server type check failure */
+  EMIG_NO_REPLY                  = -305,	/* no reply should be sent */
+  EMIG_EXCEPTION                 = -306,	/* server raised exception */
+  EMIG_ARRAY_TOO_LARGE           = -307,	/* array not large enough */
+  EMIG_SERVER_DIED               = -308,	/* server died */
+  EMIG_DESTROY_REQUEST           = -309,	/* destroy request with no reply */
 
-	/* Errors from <device/device_types.h>.  */
-	ED_IO_ERROR             = 2500  /* hardware IO error */,
-	ED_WOULD_BLOCK          = 2501  /* would block, but D_NOWAIT set */,
-	ED_NO_SUCH_DEVICE       = 2502  /* no such device */,
-	ED_ALREADY_OPEN         = 2503  /* exclusive-use device already open */,
-	ED_DEVICE_DOWN          = 2504  /* device has been shut down */,
-	ED_INVALID_OPERATION    = 2505  /* bad operation for device */,
-	ED_INVALID_RECNUM       = 2506  /* invalid record (block) number */,
-	ED_INVALID_SIZE         = 2507  /* invalid IO size */,
-	ED_NO_MEMORY            = 2508  /* memory allocation failure */,
-	ED_READ_ONLY            = 2509  /* device cannot be written to */
+/* Errors from <device/device_types.h>.  */
+  ED_IO_ERROR                    = 2500,	/* hardware IO error */
+  ED_WOULD_BLOCK                 = 2501,	/* would block, but D_NOWAIT set */
+  ED_NO_SUCH_DEVICE              = 2502,	/* no such device */
+  ED_ALREADY_OPEN                = 2503,	/* exclusive-use device already open */
+  ED_DEVICE_DOWN                 = 2504,	/* device has been shut down */
+  ED_INVALID_OPERATION           = 2505,	/* bad operation for device */
+  ED_INVALID_RECNUM              = 2506,	/* invalid record (block) number */
+  ED_INVALID_SIZE                = 2507,	/* invalid IO size */
+  ED_NO_MEMORY                   = 2508,	/* memory allocation failure */
+  ED_READ_ONLY                   = 2509,	/* device cannot be written to */
 
+  /* Because the C standard requires that errno have type 'int',
+     this enumeration must be a signed type.  */
+  __FORCE_ERROR_T_CODES_SIGNED = -1
 };
 
-#define	_HURD_ERRNOS	120
-
-/* User-visible type of error codes.  It is ok to use `int' or
-   `kern_return_t' for these, but with `error_t' the debugger prints
+/* User-visible type of error codes.  It is ok to use 'int' or
+   'kern_return_t' for these, but with 'error_t' the debugger prints
    symbolic values.  */
-#ifdef __USE_GNU
+# if !defined __error_t_defined && defined __USE_GNU
+#  define __error_t_defined 1
 typedef enum __error_t_codes error_t;
-#define __error_t_defined	1
-#endif
+# endif
+
+#endif /* not __ASSEMBLER__ */
+
+/* The C standard requires that all of the E-constants be
+   defined as macros.  */
+
+#define EPERM                          0x40000001
+#define ENOENT                         0x40000002
+#define ESRCH                          0x40000003
+#define EINTR                          0x40000004
+#define EIO                            0x40000005
+#define ENXIO                          0x40000006
+#define E2BIG                          0x40000007
+#define ENOEXEC                        0x40000008
+#define EBADF                          0x40000009
+#define ECHILD                         0x4000000a
+#define EDEADLK                        0x4000000b
+#define ENOMEM                         0x4000000c
+#define EACCES                         0x4000000d
+#define EFAULT                         0x4000000e
+#define ENOTBLK                        0x4000000f
+#define EBUSY                          0x40000010
+#define EEXIST                         0x40000011
+#define EXDEV                          0x40000012
+#define ENODEV                         0x40000013
+#define ENOTDIR                        0x40000014
+#define EISDIR                         0x40000015
+#define EINVAL                         0x40000016
+#define EMFILE                         0x40000018
+#define ENFILE                         0x40000017
+#define ENOTTY                         0x40000019
+#define ETXTBSY                        0x4000001a
+#define EFBIG                          0x4000001b
+#define ENOSPC                         0x4000001c
+#define ESPIPE                         0x4000001d
+#define EROFS                          0x4000001e
+#define EMLINK                         0x4000001f
+#define EPIPE                          0x40000020
+#define EDOM                           0x40000021
+#define ERANGE                         0x40000022
+#define EAGAIN                         0x40000023
+#define EWOULDBLOCK                    EAGAIN
+#define EINPROGRESS                    0x40000024
+#define EALREADY                       0x40000025
+#define ENOTSOCK                       0x40000026
+#define EMSGSIZE                       0x40000028
+#define EPROTOTYPE                     0x40000029
+#define ENOPROTOOPT                    0x4000002a
+#define EPROTONOSUPPORT                0x4000002b
+#define ESOCKTNOSUPPORT                0x4000002c
+#define EOPNOTSUPP                     0x4000002d
+#define EPFNOSUPPORT                   0x4000002e
+#define EAFNOSUPPORT                   0x4000002f
+#define EADDRINUSE                     0x40000030
+#define EADDRNOTAVAIL                  0x40000031
+#define ENETDOWN                       0x40000032
+#define ENETUNREACH                    0x40000033
+#define ENETRESET                      0x40000034
+#define ECONNABORTED                   0x40000035
+#define ECONNRESET                     0x40000036
+#define ENOBUFS                        0x40000037
+#define EISCONN                        0x40000038
+#define ENOTCONN                       0x40000039
+#define EDESTADDRREQ                   0x40000027
+#define ESHUTDOWN                      0x4000003a
+#define ETOOMANYREFS                   0x4000003b
+#define ETIMEDOUT                      0x4000003c
+#define ECONNREFUSED                   0x4000003d
+#define ELOOP                          0x4000003e
+#define ENAMETOOLONG                   0x4000003f
+#define EHOSTDOWN                      0x40000040
+#define EHOSTUNREACH                   0x40000041
+#define ENOTEMPTY                      0x40000042
+#define EPROCLIM                       0x40000043
+#define EUSERS                         0x40000044
+#define EDQUOT                         0x40000045
+#define ESTALE                         0x40000046
+#define EREMOTE                        0x40000047
+#define EBADRPC                        0x40000048
+#define ERPCMISMATCH                   0x40000049
+#define EPROGUNAVAIL                   0x4000004a
+#define EPROGMISMATCH                  0x4000004b
+#define EPROCUNAVAIL                   0x4000004c
+#define ENOLCK                         0x4000004d
+#define EFTYPE                         0x4000004f
+#define EAUTH                          0x40000050
+#define ENEEDAUTH                      0x40000051
+#define ENOSYS                         0x4000004e
+#define ENOTSUP                        0x40000076
+#define EILSEQ                         0x4000006a
+#define EBACKGROUND                    0x40000064
+#define EDIED                          0x40000065
+#define ED                             0x40000066
+#define EGREGIOUS                      0x40000067
+#define EIEIO                          0x40000068
+#define EGRATUITOUS                    0x40000069
+#define EBADMSG                        0x4000006b
+#define EIDRM                          0x4000006c
+#define EMULTIHOP                      0x4000006d
+#define ENODATA                        0x4000006e
+#define ENOLINK                        0x4000006f
+#define ENOMSG                         0x40000070
+#define ENOSR                          0x40000071
+#define ENOSTR                         0x40000072
+#define EOVERFLOW                      0x40000073
+#define EPROTO                         0x40000074
+#define ETIME                          0x40000075
+#define ECANCELED                      0x40000077
+
+/* Errors from <mach/message.h>.  */
+#define EMACH_SEND_IN_PROGRESS         0x10000001
+#define EMACH_SEND_INVALID_DATA        0x10000002
+#define EMACH_SEND_INVALID_DEST        0x10000003
+#define EMACH_SEND_TIMED_OUT           0x10000004
+#define EMACH_SEND_WILL_NOTIFY         0x10000005
+#define EMACH_SEND_NOTIFY_IN_PROGRESS  0x10000006
+#define EMACH_SEND_INTERRUPTED         0x10000007
+#define EMACH_SEND_MSG_TOO_SMALL       0x10000008
+#define EMACH_SEND_INVALID_REPLY       0x10000009
+#define EMACH_SEND_INVALID_RIGHT       0x1000000a
+#define EMACH_SEND_INVALID_NOTIFY      0x1000000b
+#define EMACH_SEND_INVALID_MEMORY      0x1000000c
+#define EMACH_SEND_NO_BUFFER           0x1000000d
+#define EMACH_SEND_NO_NOTIFY           0x1000000e
+#define EMACH_SEND_INVALID_TYPE        0x1000000f
+#define EMACH_SEND_INVALID_HEADER      0x10000010
+#define EMACH_RCV_IN_PROGRESS          0x10004001
+#define EMACH_RCV_INVALID_NAME         0x10004002
+#define EMACH_RCV_TIMED_OUT            0x10004003
+#define EMACH_RCV_TOO_LARGE            0x10004004
+#define EMACH_RCV_INTERRUPTED          0x10004005
+#define EMACH_RCV_PORT_CHANGED         0x10004006
+#define EMACH_RCV_INVALID_NOTIFY       0x10004007
+#define EMACH_RCV_INVALID_DATA         0x10004008
+#define EMACH_RCV_PORT_DIED            0x10004009
+#define EMACH_RCV_IN_SET               0x1000400a
+#define EMACH_RCV_HEADER_ERROR         0x1000400b
+#define EMACH_RCV_BODY_ERROR           0x1000400c
+
+/* Errors from <mach/kern_return.h>.  */
+#define EKERN_INVALID_ADDRESS          1
+#define EKERN_PROTECTION_FAILURE       2
+#define EKERN_NO_SPACE                 3
+#define EKERN_INVALID_ARGUMENT         4
+#define EKERN_FAILURE                  5
+#define EKERN_RESOURCE_SHORTAGE        6
+#define EKERN_NOT_RECEIVER             7
+#define EKERN_NO_ACCESS                8
+#define EKERN_MEMORY_FAILURE           9
+#define EKERN_MEMORY_ERROR             10
+#define EKERN_NOT_IN_SET               12
+#define EKERN_NAME_EXISTS              13
+#define EKERN_ABORTED                  14
+#define EKERN_INVALID_NAME             15
+#define EKERN_INVALID_TASK             16
+#define EKERN_INVALID_RIGHT            17
+#define EKERN_INVALID_VALUE            18
+#define EKERN_UREFS_OVERFLOW           19
+#define EKERN_INVALID_CAPABILITY       20
+#define EKERN_RIGHT_EXISTS             21
+#define EKERN_INVALID_HOST             22
+#define EKERN_MEMORY_PRESENT           23
+#define EKERN_WRITE_PROTECTION_FAILURE 24
+#define EKERN_TERMINATED               26
+#define EKERN_TIMEDOUT                 27
+#define EKERN_INTERRUPTED              28
 
-/* Return the current thread's location for `errno'.
-   The syntax of this function allows redeclarations like `int errno'.  */
-extern int *__errno_location (void) __THROW __attribute__ ((__const__));
+/* Errors from <mach/mig_errors.h>.  */
+#define EMIG_TYPE_ERROR                -300
+#define EMIG_REPLY_MISMATCH            -301
+#define EMIG_REMOTE_ERROR              -302
+#define EMIG_BAD_ID                    -303
+#define EMIG_BAD_ARGUMENTS             -304
+#define EMIG_NO_REPLY                  -305
+#define EMIG_EXCEPTION                 -306
+#define EMIG_ARRAY_TOO_LARGE           -307
+#define EMIG_SERVER_DIED               -308
+#define EMIG_DESTROY_REQUEST           -309
 
-#define errno			(*__errno_location ())
+/* Errors from <device/device_types.h>.  */
+#define ED_IO_ERROR                    2500
+#define ED_WOULD_BLOCK                 2501
+#define ED_NO_SUCH_DEVICE              2502
+#define ED_ALREADY_OPEN                2503
+#define ED_DEVICE_DOWN                 2504
+#define ED_INVALID_OPERATION           2505
+#define ED_INVALID_RECNUM              2506
+#define ED_INVALID_SIZE                2507
+#define ED_NO_MEMORY                   2508
+#define ED_READ_ONLY                   2509
 
-#endif /* <errno.h> included.  */
+#define _HURD_ERRNOS 120
 
-#if !defined (_ERRNO_H) && defined (__need_Emath)
-#define	EDOM            _HURD_ERRNO (33)/* Numerical argument out of domain */
-#define	ERANGE          _HURD_ERRNO (34)/* Numerical result out of range */
-#endif /* <errno.h> not included and need math error codes.  */
+#endif /* bits/errno.h.  */
diff --git a/sysdeps/mach/hurd/errnos.awk b/sysdeps/mach/hurd/errnos.awk
index 1cd2a0ac96..1fdca40d38 100644
--- a/sysdeps/mach/hurd/errnos.awk
+++ b/sysdeps/mach/hurd/errnos.awk
@@ -19,71 +19,74 @@
 # @errno{ENOSYS, 123, Function not implemented}
 
 BEGIN {
-    print "/* This file generated by errnos.awk.  */";
-    print "";
-    print "/* The Hurd uses Mach error system 0x10, currently only subsystem 0. */";
-    print "#ifndef _HURD_ERRNO";
-    print "#define _HURD_ERRNO(n)\t((0x10 << 26) | ((n) & 0x3fff))";
-    print "#endif";
+    print "/* This file generated by errnos.awk from";
+    for (i = 1; i < ARGC; i++)
+      {
+	arg = ARGV[i];
+	sub(/.*(manual|include)\//, "", arg)
+	print "     " arg;
+      }
+    print "   Do not edit this file; edit errnos.awk and regenerate it.  */";
     print "";
-    print "#ifdef _ERRNO_H\n";
-    print "enum __error_t_codes\n{";
-    print "\t/* The value zero always means success and it is perfectly fine for";
-    print "\t   code to use 0 explicitly (or implicitly, e.g. via Boolean coercion).";
-    print "\t   Having an enum entry for zero both makes the debugger print the name";
-    print "\t   for error_t-typed zero values, and prevents the compiler from";
-    print "\t   issuing warnings about 'case 0:' in a switch on an error_t-typed";
-    print "\t   value.  */";
-    print "\tESUCCESS = 0,"
+    print "#ifndef _BITS_ERRNO_H";
+    print "#define _BITS_ERRNO_H 1";
     print "";
+    print "#if !defined _ERRNO_H";
+    print "# error \"Never include <bits/errno.h> directly; use <errno.h> instead.\"";
+    print "#endif";
+
     maxerrno = 0;
+    maxerrlen = 0;
     in_mach_errors = "";
-    in_math = 0;
-    edom = erange = "";
-    print "#undef EDOM\n#undef ERANGE";
-    lno = 0;
+    seq = 0;
   }
 
 /^@errno\{/ \
   {
-    etext = "";
-    for (i = 3; i <= NF; ++i)
-      etext = etext " " $i;
-    etext = substr(etext, 1, length(etext)-1)
-
     e = substr($1, 8, length($1)-8)
+    if (length(e) > maxerrlen)
+      maxerrlen = length(e);
     if (e == "EWOULDBLOCK")
       {
-	lines[lno++]="#define EWOULDBLOCK EAGAIN /* Operation would block */";
+	econsts[seq] = e;
+	errnos[seq] = "EAGAIN";
+	seq++;
 	next;
       }
 
-    errno = substr($2, 1, length($2)-1) + 0
+    errno = substr($2, 1, length($2)-1) + 0;
     if (errno == 0)
       next;
-    if (errno > maxerrno) maxerrno = errno;
-    x = sprintf ("%-40s/*%s */", sprintf ("%-24s%s", "#define\t" e,
-					  "_HURD_ERRNO (" errno ")"),
-		 etext);
-    if (e == "EDOM")
-      edom = x;
-    else if (e == "ERANGE")
-      erange = x;
-    comma[lno] = 1;
-    lines[lno++] = sprintf("\t%-16s= _HURD_ERRNO (%d)", e, errno);
-    lines[lno++] = x;
+    if (errno > 0x3ffff)
+      {
+	printf("%s:%d: errno value %d too large for the Hurd\n",
+	       FILENAME, NR, errno) >> "/dev/stderr";
+	exit 1;
+      }
+    if (errno > maxerrno)
+      maxerrno = errno;
+
+    etext = "";
+    for (i = 3; i <= NF; ++i)
+      etext = etext " " $i;
+    etext = substr(etext, 2, length(etext)-2);
+
+    econsts[seq] = e;
+    errnos[seq] = sprintf("0x%08x", 0x40000000 + errno);
+    etexts[seq] = etext;
+    seq++;
     next;
   }
 
 NF == 3 && $1 == "#define" && $2 == "MACH_SEND_IN_PROGRESS" \
   {
     in_mach_errors = FILENAME;
-    lines[lno++] = "\n\t/* Errors from <mach/message.h>.  */";
+    annot[seq++] = "\n/* Errors from <mach/message.h>.  */";
   }
 NF == 3 && $1 == "#define" && $2 == "KERN_SUCCESS" \
   {
     in_mach_errors = FILENAME;
-    lines[lno++] = "\n\t/* Errors from <mach/kern_return.h>.  */";
+    annot[seq++] = "\n/* Errors from <mach/kern_return.h>.  */";
     next;
   }
 
@@ -92,16 +95,24 @@ in_mach_errors != "" && $2 == "MACH_IPC_COMPAT" \
     in_mach_errors = "";
   }
 
+# FIXME: mach/message.h and mach/kern_return.h do include error
+# descriptions which we could slurp, but some of them are very long,
+# we would need to word-wrap them.
 in_mach_errors == FILENAME && NF == 3 && $1 == "#define" \
   {
-    comma[lno] = 1;
-    lines[lno++] = sprintf("\t%-32s= %s", "E" $2, $3);
+    e = "E" $2;
+    if (length(e) > maxerrlen)
+      maxerrlen = length(e);
+    econsts[seq] = e;
+    errnos[seq] = $3;
+    etexts[seq] = "";
+    seq++;
   }
 
 $1 == "#define" && $2 == "_MACH_MIG_ERRORS_H_" \
   {
     in_mig_errors = 1;
-    lines[lno++] = "\n\t/* Errors from <mach/mig_errors.h>.  */";
+    annot[seq++] = "\n/* Errors from <mach/mig_errors.h>.  */";
     next;
   }
 in_mig_errors && $1 == "#endif" && $3 == "_MACH_MIG_ERRORS_H_" \
@@ -112,17 +123,23 @@ in_mig_errors && $1 == "#endif" && $3 == "_MACH_MIG_ERRORS_H_" \
 (in_mig_errors && $1 == "#define" && $3 <= -300) || \
 (in_device_errors && $1 == "#define" && /D_/ && NF > 3) \
   {
-    comment = "";
-    for (i = 4; i <= NF; ++i)
-      comment = comment " " $i;
-    comma[lno] = 1;
-    lines[lno++] = sprintf("%-32s", sprintf ("\t%-24s= %s", "E" $2, $3)) comment;
+    etext = "";
+    for (i = 5; i < NF; ++i)
+      etext = etext " " $i;
+
+    e = "E" $2;
+    if (length(e) > maxerrlen)
+      maxerrlen = length(e);
+    econsts[seq] = e;
+    errnos[seq] = $3;
+    etexts[seq] = substr(etext, 2, length(etext)-1);
+    seq++;
   }
 
 $1 == "#define" && $2 == "D_SUCCESS" \
   {
     in_device_errors = 1;
-    lines[lno++] = "\n\t/* Errors from <device/device_types.h>.  */";
+    annot[seq++] = "\n/* Errors from <device/device_types.h>.  */";
     next;
   }
 in_device_errors && $1 == "#endif" \
@@ -130,36 +147,73 @@ in_device_errors && $1 == "#endif" \
     in_device_errors = 0;
   }
 
+function print_errno_enum(maxseq)
+{
+  print "";
+  print "#ifndef __ASSEMBLER__";
+  print "";
+  print "enum __error_t_codes";
+  print "{";
+  print "  /* The value zero always means success and it is perfectly fine";
+  print "     for code to use 0 explicitly (or implicitly, e.g. via Boolean";
+  print "     coercion.)  Having an enum entry for zero both makes the";
+  print "     debugger print the name for error_t-typed zero values, and";
+  print "     prevents the compiler from issuing warnings about 'case 0:'";
+  print "     in a switch on an error_t-typed value.  */";
+  printf("  %-*s = 0,\n", maxerrlen, "ESUCCESS");
+
+  print "";
+  print "  /* The Hurd uses Mach error system 0x10, subsystem 0. */";
+  for (i = 0; i < maxseq; i++)
+    {
+      if (i in annot)
+	print annot[i];
+      else if (i in etexts && etexts[i] != "")
+	printf("  %-*s = %s,\t/* %s */\n",
+	       maxerrlen, econsts[i], errnos[i], etexts[i]);
+      else if (errnos[i] != "EAGAIN")
+	printf("  %-*s = %s,\n", maxerrlen, econsts[i], errnos[i]);
+    }
+
+  print "";
+  print "  /* Because the C standard requires that errno have type 'int',"
+  print "     this enumeration must be a signed type.  */";
+  print "  __FORCE_ERROR_T_CODES_SIGNED = -1";
+  print "};";
+  print "";
+  print "/* User-visible type of error codes.  It is ok to use 'int' or";
+  print "   'kern_return_t' for these, but with 'error_t' the debugger prints";
+  print "   symbolic values.  */";
+  print "# if !defined __error_t_defined && defined __USE_GNU";
+  print "#  define __error_t_defined 1";
+  print "typedef enum __error_t_codes error_t;"
+  print "# endif";
+  print "";
+  print "#endif /* not __ASSEMBLER__ */";
+}
+
+function print_errno_defines(maxseq)
+{
+  print "";
+  print "/* The C standard requires that all of the E-constants be"
+  print "   defined as macros.  */"
+  print "";
+  for (i = 0; i < maxseq; i++)
+    {
+      if (i in annot)
+	print annot[i];
+      else
+	printf("#define %-*s %s\n", maxerrlen, econsts[i], errnos[i]);
+    }
+  print "";
+  printf("#define _HURD_ERRNOS %d\n", maxerrno+1);
+}
 
 END \
   {
-    for (i = 0; i < lno - 1; ++i)
-      printf "%s%s\n", lines[i], (comma[i] ? "," : "");
-    print lines[i];
-    print "";
-    print "};";
-    print "";
-    printf "#define\t_HURD_ERRNOS\t%d\n", maxerrno+1;
-    print "";
-    print "\
-/* User-visible type of error codes.  It is ok to use `int' or\n\
-   `kern_return_t' for these, but with `error_t' the debugger prints\n\
-   symbolic values.  */";
-    print "#ifdef __USE_GNU";
-    print "typedef enum __error_t_codes error_t;"
-    print "#define __error_t_defined\t1"
-    print "#endif";
-    print "";
-    print "\
-/* Return the current thread's location for `errno'.\n\
-   The syntax of this function allows redeclarations like `int errno'.  */\n\
-extern int *__errno_location (void) __THROW __attribute__ ((__const__));\n\
-\n\
-#define errno			(*__errno_location ())\n\
-";
-    print "#endif /* <errno.h> included.  */";
+    print_errno_enum(seq);
+    print_errno_defines(seq);
+
     print "";
-    print "#if !defined (_ERRNO_H) && defined (__need_Emath)";
-    print edom; print erange;
-    print "#endif /* <errno.h> not included and need math error codes.  */";
+    print "#endif /* bits/errno.h.  */";
   }