* fhandler.cc (check_posix_perm): Moved here from syscalls.cc.

(fhandler_base::fpathconf): New method implementing (f)pathconf.
	* fhandler.h (class fhandler_base): Declare fpathconf method.
	* path.cc (path_conv::check): Replace MAX_LINK_DEPTH with SYMLOOP_MAX.
	* path.h (MAX_LINK_DEPTH): Delete.
	* syscalls.cc (check_posix_perm): Move to fhandler.cc.
	(fpathconf): Call fhandler's fpathconf method.
	(pathconf): Build fhandler and call fhandler's fpathconf method.
	* sysconf.cc (sysconf): Reorder switch according to order of flags
	in sys/unistd.h.  Add handling for some missing flags.
	* include/limits.h: Reorder according to SUSv3 description.  Add some
	missing definitions.  Add comments.
	* include/sys/syslimits.h: New file overriding newlib's syslimits.h
	file.

winsup/cygwin/ChangeLog

@@ -1,3 +1,20 @@
+2006-11-07  Corinna Vinschen  <corinna@vinschen.de>
+
+	* fhandler.cc (check_posix_perm): Moved here from syscalls.cc.
+	(fhandler_base::fpathconf): New method implementing (f)pathconf.
+	* fhandler.h (class fhandler_base): Declare fpathconf method.
+	* path.cc (path_conv::check): Replace MAX_LINK_DEPTH with SYMLOOP_MAX.
+	* path.h (MAX_LINK_DEPTH): Delete.
+	* syscalls.cc (check_posix_perm): Move to fhandler.cc.
+	(fpathconf): Call fhandler's fpathconf method.
+	(pathconf): Build fhandler and call fhandler's fpathconf method.
+	* sysconf.cc (sysconf): Reorder switch according to order of flags
+	in sys/unistd.h.  Add handling for some missing flags.
+	* include/limits.h: Reorder according to SUSv3 description.  Add some
+	missing definitions.  Add comments.
+	* include/sys/syslimits.h: New file overriding newlib's syslimits.h
+	file.
+
 2006-11-06  Corinna Vinschen  <corinna@vinschen.de>
 
 	* dtable.cc (build_fh_pc): Add missing DEV_SD1_MAJOR case (Thanks to

winsup/cygwin/fhandler.cc

@@ -1713,3 +1713,99 @@ fhandler_base::fsync ()
   __seterrno ();
   return -1;
 }
+
+/* Helper function for Cygwin specific pathconf flags _PC_POSIX_PERMISSIONS
+   and _PC_POSIX_SECURITY. */
+static int
+check_posix_perm (const char *fname, int v)
+{
+  /* Windows 95/98/ME don't support file system security at all. */
+  if (!wincap.has_security ())
+    return 0;
+
+  /* ntea is ok for supporting permission bits but it doesn't support
+     full POSIX security settings. */
+  if (v == _PC_POSIX_PERMISSIONS && allow_ntea)
+    return 1;
+
+  if (!allow_ntsec)
+    return 0;
+
+  char *root = rootdir (fname, (char *)alloca (strlen (fname)));
+
+  if (!allow_smbntsec
+      && ((root[0] == '\\' && root[1] == '\\')
+	  || GetDriveType (root) == DRIVE_REMOTE))
+    return 0;
+
+  DWORD vsn, len, flags;
+  if (!GetVolumeInformation (root, NULL, 0, &vsn, &len, &flags, NULL, 16))
+    {
+      __seterrno ();
+      return 0;
+    }
+
+  return (flags & FS_PERSISTENT_ACLS) ? 1 : 0;
+}
+
+int
+fhandler_base::fpathconf (int v)
+{
+  switch (v)
+    {
+    case _PC_LINK_MAX:
+      return pc.fs_is_ntfs () || pc.fs_is_samba () || pc.fs_is_nfs ()
+	     ? LINK_MAX : 1;
+    case _PC_MAX_CANON:
+      if (is_tty ())
+        return MAX_CANON;
+      set_errno (EINVAL);
+      break;
+    case _PC_MAX_INPUT:
+      if (is_tty ())
+        return MAX_INPUT;
+      set_errno (EINVAL);
+      break;
+    case _PC_NAME_MAX:
+      /* NAME_MAX is without trailing \0 */
+      return pc.isdir () ? PATH_MAX - strlen (get_name ()) - 2 : NAME_MAX;
+    case _PC_PATH_MAX:
+      /* PATH_MAX is with trailing \0 */
+      return pc.isdir () ? PATH_MAX - strlen (get_name ()) - 1 : PATH_MAX;
+    case _PC_PIPE_BUF:
+      if (pc.isdir ()
+	  || get_device () == FH_FIFO || get_device () == FH_PIPE
+	  || get_device () == FH_PIPER || get_device () == FH_PIPEW)
+        return PIPE_BUF;
+      set_errno (EINVAL);
+      break;
+    case _PC_CHOWN_RESTRICTED:
+      return 1;
+    case _PC_NO_TRUNC:
+      return 1;
+    case _PC_VDISABLE:
+      if (!is_tty ())
+        set_errno (EINVAL);
+      break;
+    case _PC_ASYNC_IO:
+    case _PC_PRIO_IO:
+    case _PC_SYNC_IO:
+      break;
+    case _PC_FILESIZEBITS:
+      return FILESIZEBITS;
+    case _PC_2_SYMLINKS:
+      return 1;
+    case _PC_SYMLINK_MAX:
+      break;
+    case _PC_POSIX_PERMISSIONS:
+    case _PC_POSIX_SECURITY:
+      if (get_device () == FH_FS)
+        return check_posix_perm (get_win32_name (), v);
+      set_errno (EINVAL);
+      break;
+    default:
+      set_errno (EINVAL);
+      break;
+    }
+  return -1;
+}

winsup/cygwin/fhandler.h

@@ -296,6 +296,7 @@ class fhandler_base
   virtual _off64_t lseek (_off64_t offset, int whence);
   virtual int lock (int, struct __flock64 *);
   virtual int dup (fhandler_base *child);
+  virtual int fpathconf (int);
 
   virtual HANDLE mmap (caddr_t *addr, size_t len, int prot,
 		       int flags, _off64_t off);

winsup/cygwin/include/limits.h

@@ -1,6 +1,6 @@
 /* limits.h
 
-   Copyright 1999, 2000, 2001, 2002, 2003, 2004, 2005 Red Hat, Inc.
+   Copyright 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006 Red Hat, Inc.
 
 This file is part of Cygwin.
 
@@ -18,6 +18,9 @@ details. */
 #define _LIMITS_H___
 #define _MACH_MACHLIMITS_H_
 
+
+/* Numerical limits */
+
 /* Number of bits in a `char'.  */
 #undef CHAR_BIT
 #define CHAR_BIT 8
@@ -117,27 +120,34 @@ details. */
 #undef ULLONG_MAX
 #define ULLONG_MAX (LLONG_MAX * 2ULL + 1)
 
-/* Maximum number of iovcnt in a writev (an arbitrary number) */
-#undef IOV_MAX
-#define IOV_MAX 1024
-
 /* Maximum size of ssize_t */
 #undef SSIZE_MAX
 #define SSIZE_MAX (__LONG_MAX__)
 
-/* Maximum length of a path */
-#define PATH_MAX 260
 
-/* Maximum length of a path component. */
+/* Runtime Invariant Values */
-#define NAME_MAX 255
 
-/* Max num groups for a user, value taken from NT documentation */
+/* Maximum number of bytes in arguments and environment passed in an exec
-/* Must match <sys/param.h> NGROUPS */
+   call.  32000 is the safe value used for Windows processes when called
-#define NGROUPS_MAX 16
+   from Cygwin processes. */
+#undef ARG_MAX
+#define ARG_MAX 32000
 
-/* WaitForMultipleObjects can't handle waiting for more than 64 objects.
+/* Maximum number of simultaneous processes per real user ID. */
-   This limits how many children we can fork/spawn off. */
+#undef CHILD_MAX
-#define CHILD_MAX 63
+#define CHILD_MAX 256
+
+/* Maximum length of a host name. */
+#undef HOST_NAME_MAX
+#define HOST_NAME_MAX 255
+
+/* Maximum number of iovcnt in a writev (an arbitrary number) */
+#undef IOV_MAX
+#define IOV_MAX 1024
+
+/* Maximum number of characters in a login name. */
+#undef LOGIN_NAME_MAX
+#define LOGIN_NAME_MAX 256	/* equal to UNLEN defined in w32api/lmcons.h */
 
 /* # of open files per process. Actually it can be more since Cygwin
    grows the dtable as necessary. We define a reasonable limit here
@@ -146,30 +156,126 @@ details. */
 #undef OPEN_MAX
 #define OPEN_MAX 256
 
-/* # of bytes in a pipe buf. This is the max # of bytes which can be
+/* Size in bytes of a page. */
-   written to a pipe in one atomic operation. */
+#undef PAGESIZE
-#undef PIPE_BUF
+#undef PAGE_SIZE
-#define PIPE_BUF 4096
+#define PAGESIZE 65536
+#define PAGE_SIZE PAGESIZE
+
+/* Maximum number of realtime signals reserved for application use. */
+/* FIXME: We only support one realtime signal but _POSIX_RTSIG_MAX is 8. */
+#undef RTSIG_MAX
+#define RTSIG_MAX 1
+
+/* Number of streams that one process can have open at one time. */
+#undef STREAM_MAX
+#define STREAM_MAX 20
+
+/* Maximum number of nested symbolic links. */
+#undef SYMLOOP_MAX
+#define SYMLOOP_MAX 10
 
 /* Maximum number of timer expiration overruns. */
 #undef TIMER_MAX
 #define TIMER_MAX 32
 
-/* Maximum number of characters in a login name. */
-#undef LOGIN_NAME_MAX
-#define LOGIN_NAME_MAX 256	/* equal to UNLEN defined in w32api/lmcons.h */
-
 /* Maximum number of characters in a tty name. */
 #undef TTY_NAME_MAX
 #define TTY_NAME_MAX 12
 
+
+/* Pathname Variable Values */
+
+/* Minimum bits needed to represent the maximum size of a regular file. */
+#undef FILESIZEBITS
+#define FILESIZEBITS 64
+
+/* Maximum number of hardlinks to a file. */
+#undef LINK_MAX
+#define LINK_MAX 1024
+
+/* Maximum number of bytes in a terminal canonical input line. */
+#undef MAX_CANON
+#define MAX_CANON 255
+
+/* Minimum number of bytes available in a terminal input queue. */
+#undef MAX_INPUT
+#define MAX_INPUT 255
+
+/* Maximum length of a path component. */
+#undef NAME_MAX
+#define NAME_MAX 255
+
+/* Maximum length of a path */
+#undef PATH_MAX
+#define PATH_MAX 260
+
+/* # of bytes in a pipe buf. This is the max # of bytes which can be
+   written to a pipe in one atomic operation. */
+#undef PIPE_BUF
+#define PIPE_BUF 4096
+
+
+/* Runtime Increasable Values */
+
+/* Maximum obase values allowed by the bc utility. */
+#undef BC_BASE_MAX
+#define BC_BASE_MAX 99
+
+/* Maximum number of elements permitted in an array by the bc utility. */
+#undef BC_DIM_MAX
+#define BC_DIM_MAX 2048
+
+/* Maximum scale value allowed by the bc utility. */
+#undef BC_SCALE_MAX
+#define BC_SCALE_MAX 99
+
+/* Maximum length of a string constant accepted by the bc utility. */
+#undef BC_STRING_MAX
+#define BC_STRING_MAX 1000
+
+/* Maximum number of weights that can be assigned to an entry of the
+   LC_COLLATE order keyword in the locale definition file. */
+/* FIXME: We don't support this at all right now, so this value is
+   misleading at best.  It's also lower than _POSIX2_COLL_WEIGHTS_MAX
+   which is not good.  So, for now we deliberately not define it even
+   though it was defined in the former syslimits.h file. */
+#if 0
+#undef COLL_WEIGHTS_MAX
+#define COLL_WEIGHTS_MAX 0
+#endif
+
+/* Maximum number of expressions that can be nested within parentheses
+   by the expr utility. */
+#undef EXPR_NEST_MAX
+#define EXPR_NEST_MAX 32
+
+/* Maximum bytes of a text utility's input line */
+#undef LINE_MAX
+#define LINE_MAX 2048
+
+/* Max num groups for a user, value taken from NT documentation */
+/* Must match <sys/param.h> NGROUPS */
+#undef NGROUPS_MAX
+#define NGROUPS_MAX 16
+
+/* Maximum number of repeated occurrences of a regular expression when
+   using the interval notation \{m,n\} */
+#undef RE_DUP_MAX
+#define RE_DUP_MAX 255
+
+
+/* Minimum Values */
+
 /* POSIX values */
 /* These should never vary from one system type to another */
 /* They represent the minimum values that POSIX systems must support.
    POSIX-conforming apps must not require larger values. */
 #define	_POSIX_ARG_MAX		4096
 #define _POSIX_CHILD_MAX	6
+#define _POSIX_HOST_NAME_MAX	255
 #define _POSIX_LINK_MAX		8
+#define _POSIX_LOGIN_NAME_MAX	9
 #define _POSIX_MAX_CANON	255
 #define _POSIX_MAX_INPUT	255
 #define _POSIX_NAME_MAX		14
@@ -177,16 +283,32 @@ details. */
 #define _POSIX_OPEN_MAX		16
 #define _POSIX_PATH_MAX		255
 #define _POSIX_PIPE_BUF		512
+#define _POSIX_RE_DUP_MAX	255
+#define _POSIX_RTSIG_MAX	8
 #define _POSIX_SSIZE_MAX	32767
 #define _POSIX_STREAM_MAX	8
-#define _POSIX_TZNAME_MAX       3
+#define _POSIX_SYMLINK_MAX	255
-#define _POSIX_RTSIG_MAX	8
+#define _POSIX_SYMLOOP_MAX	8
 #define _POSIX_TIMER_MAX	32
 #define _POSIX_TTY_NAME_MAX	9
+#define _POSIX_TZNAME_MAX       3
 
-#define RTSIG_MAX		_POSIX_RTSIG_MAX
+#define _POSIX2_BC_BASE_MAX	99
+#define _POSIX2_BC_DIM_MAX	2048
+#define _POSIX2_BC_SCALE_MAX	99
+#define _POSIX2_BC_STRING_MAX	1000
+#if 0	/* See comment about COLL_WEIGHTS_MAX above. */
+#define _POSIX2_COLL_WEIGHTS_MAX	2
+#endif
+#define _POSIX2_EXPR_NEST_MAX	32
+#define _POSIX2_LINE_MAX	2048
+#define _POSIX2_RE_DUP_MAX	255
 
-/* Used for nice and get/setpriority. */
+
+/* Other Invariant Values */
+
+/* Default process priority. */
+#undef NZERO
 #define NZERO			20
 
 #endif /* _MACH_MACHLIMITS_H_ */

winsup/cygwin/include/sys/syslimits.h

@@ -0,0 +1,20 @@
+/* sys/syslimits.h
+
+   Copyright 2006 Red Hat, Inc.
+
+This file is part of Cygwin.
+
+This software is a copyrighted work licensed under the terms of the
+Cygwin license.  Please consult the file "CYGWIN_LICENSE" for
+details. */
+
+#ifndef _SYS_SYSLIMITS_H
+#define _SYS_SYSLIMITS_H
+
+#ifdef _COMPILING_NEWLIB
+# include <limits.h>
+#else
+# error "Do not include sys/syslimits.h from applications directly."
+#endif
+
+#endif /*_SYS_SYSLIMITS_H */

winsup/cygwin/path.cc

@@ -907,7 +907,7 @@ virtual_component_retry:
 	}
 
       /* Arrive here if above loop detected a symlink. */
-      if (++loop > MAX_LINK_DEPTH)
+      if (++loop > SYMLOOP_MAX)
 	{
 	  error = ELOOP;   // Eep.
 	  return;

winsup/cygwin/path.h

@@ -272,8 +272,6 @@ class path_conv
 /* Socket marker */
 #define SOCKET_COOKIE  "!<socket >"
 
-/* Maximum depth of symlinks (after which ELOOP is issued).  */
-#define MAX_LINK_DEPTH 10
 int __stdcall slash_unc_prefix_p (const char *path) __attribute__ ((regparm(1)));
 
 enum fe_types

winsup/cygwin/syscalls.cc

@@ -1,7 +1,7 @@
 /* syscalls.cc: syscalls
 
    Copyright 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004,
-   2005 Red Hat, Inc.
+   2005, 2006 Red Hat, Inc.
 
 This file is part of Cygwin.
 
@@ -1460,38 +1460,6 @@ getsystempagesize ()
   return (size_t) system_info.dwPageSize;
 }
 
-static int
-check_posix_perm (const char *fname, int v)
-{
-  /* Windows 95/98/ME don't support file system security at all. */
-  if (!wincap.has_security ())
-    return 0;
-
-  /* ntea is ok for supporting permission bits but it doesn't support
-     full POSIX security settings. */
-  if (v == _PC_POSIX_PERMISSIONS && allow_ntea)
-    return 1;
-
-  if (!allow_ntsec)
-    return 0;
-
-  char *root = rootdir (fname, (char *)alloca (strlen (fname)));
-
-  if (!allow_smbntsec
-      && ((root[0] == '\\' && root[1] == '\\')
-	  || GetDriveType (root) == DRIVE_REMOTE))
-    return 0;
-
-  DWORD vsn, len, flags;
-  if (!GetVolumeInformation (root, NULL, 0, &vsn, &len, &flags, NULL, 16))
-    {
-      __seterrno ();
-      return 0;
-    }
-
-  return (flags & FS_PERSISTENT_ACLS) ? 1 : 0;
-}
-
 /* FIXME: not all values are correct... */
 extern "C" long int
 fpathconf (int fd, int v)
@@ -1499,50 +1467,14 @@ fpathconf (int fd, int v)
   cygheap_fdget cfd (fd);
   if (cfd < 0)
     return -1;
-  switch (v)
+  return cfd->fpathconf (v);
-    {
-    case _PC_LINK_MAX:
-      return _POSIX_LINK_MAX;
-    case _PC_MAX_CANON:
-    case _PC_MAX_INPUT:
-      if (isatty (fd))
-	return _POSIX_MAX_CANON;
-      else
-	{
-	  set_errno (EBADF);
-	  return -1;
-	}
-    case _PC_NAME_MAX:
-    case _PC_PATH_MAX:
-      return PATH_MAX;
-    case _PC_PIPE_BUF:
-      return PIPE_BUF;
-    case _PC_CHOWN_RESTRICTED:
-    case _PC_NO_TRUNC:
-      return -1;
-    case _PC_VDISABLE:
-      if (cfd->is_tty ())
-	return -1;
-      else
-	{
-	  set_errno (EBADF);
-	  return -1;
-	}
-    case _PC_POSIX_PERMISSIONS:
-    case _PC_POSIX_SECURITY:
-      if (cfd->get_device () == FH_FS)
-	return check_posix_perm (cfd->get_win32_name (), v);
-      set_errno (EINVAL);
-      return -1;
-    default:
-      set_errno (EINVAL);
-      return -1;
-    }
 }
 
 extern "C" long int
 pathconf (const char *file, int v)
 {
+  fhandler_base *fh;
+
   myfault efault;
   if (efault.faulted (EFAULT))
     return -1;
@@ -1551,45 +1483,15 @@ pathconf (const char *file, int v)
       set_errno (ENOENT);
       return -1;
     }
-  switch (v)
+  if (!(fh = build_fh_name (file, NULL, PC_SYM_FOLLOW,
+			    transparent_exe ? stat_suffixes : NULL)))
+    return -1;
+  if (!fh->exists ())
     {
-    case _PC_PATH_MAX:
+      set_errno (ENOENT);
-      return PATH_MAX - strlen (file);
-    case _PC_NAME_MAX:
-      return PATH_MAX;
-    case _PC_LINK_MAX:
-      return _POSIX_LINK_MAX;
-    case _PC_MAX_CANON:
-    case _PC_MAX_INPUT:
-      return _POSIX_MAX_CANON;
-    case _PC_PIPE_BUF:
-      return PIPE_BUF;
-    case _PC_CHOWN_RESTRICTED:
-    case _PC_NO_TRUNC:
-      return -1;
-    case _PC_VDISABLE:
-      return -1;
-    case _PC_POSIX_PERMISSIONS:
-    case _PC_POSIX_SECURITY:
-      {
-	path_conv full_path (file, PC_SYM_FOLLOW,
-			     transparent_exe ? stat_suffixes : NULL);
-	if (full_path.error)
-	  {
-	    set_errno (full_path.error);
-	    return -1;
-	  }
-	if (full_path.is_auto_device ())
-	  {
-	    set_errno (EINVAL);
-	    return -1;
-	  }
-	return check_posix_perm (full_path, v);
-      }
-    default:
-      set_errno (EINVAL);
       return -1;
     }
+  return fh->fpathconf (v);
 }
 
 extern "C" int

winsup/cygwin/sysconf.cc

@@ -30,9 +30,17 @@ sysconf (int in)
 {
   switch (in)
     {
+      /* Keep order as in sys/unistd.h */
       case _SC_ARG_MAX:
-	/* FIXME: what's the right value?  _POSIX_ARG_MAX is only 4K */
+	/* FIXME: what's the right value?  _POSIX_ARG_MAX is only 4K.
+	   FIXME: Wouldn't it be more correct to return ARG_MAX here? */
 	return 1048576;
+      case _SC_CHILD_MAX:
+	return CHILD_MAX;
+      case _SC_CLK_TCK:
+	return CLOCKS_PER_SEC;
+      case _SC_NGROUPS_MAX:
+	return NGROUPS_MAX;
       case _SC_OPEN_MAX:
 	{
 	  long max = getdtablesize ();
@@ -40,31 +48,14 @@ sysconf (int in)
 	    max = OPEN_MAX;
 	  return max;
 	}
-      case _SC_PAGESIZE:
-	return getpagesize ();
-      case _SC_CLK_TCK:
-	return CLOCKS_PER_SEC;
       case _SC_JOB_CONTROL:
 	return _POSIX_JOB_CONTROL;
-      case _SC_CHILD_MAX:
-	return CHILD_MAX;
-      case _SC_NGROUPS_MAX:
-	return NGROUPS_MAX;
       case _SC_SAVED_IDS:
 	return _POSIX_SAVED_IDS;
-      case _SC_LOGIN_NAME_MAX:
-	return LOGIN_NAME_MAX;
-      case _SC_GETPW_R_SIZE_MAX:
-      case _SC_GETGR_R_SIZE_MAX:
-	return 16*1024;
       case _SC_VERSION:
 	return _POSIX_VERSION;
-#if 0	/* FIXME -- unimplemented */
+      case _SC_PAGESIZE:
-      case _SC_TZNAME_MAX:
+	return getpagesize ();
-	return _POSIX_TZNAME_MAX;
-      case _SC_STREAM_MAX:
-	return _POSIX_STREAM_MAX;
-#endif
       case _SC_NPROCESSORS_CONF:
       case _SC_NPROCESSORS_ONLN:
 	if (!wincap.supports_smp ())
@@ -122,12 +113,20 @@ sysconf (int in)
 	  }
       case _SC_RTSIG_MAX:
 	return RTSIG_MAX;
-      case _SC_TTY_NAME_MAX:
+      case _SC_TIMER_MAX:
-	return TTY_NAME_MAX;
+	return TIMER_MAX;
+#if 0	/* FIXME -- unimplemented */
+      case _SC_TZNAME_MAX:
+        return _POSIX_TZNAME_MAX;
+#endif
       case _SC_MEMLOCK_RANGE:
 	return _POSIX_MEMLOCK_RANGE;
       case _SC_SEMAPHORES:
-	return _POSIX_SEMAPHORES;
+        return _POSIX_SEMAPHORES;
+      case _SC_TIMERS:
+	return _POSIX_TIMERS;
+      case _SC_TTY_NAME_MAX:
+	return TTY_NAME_MAX;
       case _SC_THREADS:
 	return _POSIX_THREADS;
       case _SC_THREAD_ATTR_STACKSIZE:
@@ -138,8 +137,13 @@ sysconf (int in)
 	return _POSIX_THREAD_PROCESS_SHARED;
       case _SC_THREAD_SAFE_FUNCTIONS:
 	return _POSIX_THREAD_SAFE_FUNCTIONS;
-      case _SC_TIMERS:
+      case _SC_GETPW_R_SIZE_MAX:
-	return _POSIX_TIMERS;
+      case _SC_GETGR_R_SIZE_MAX:
+	return 16*1024;
+      case _SC_LOGIN_NAME_MAX:
+	return LOGIN_NAME_MAX;
+      case _SC_STREAM_MAX:
+	return STREAM_MAX;
     }
 
   /* Invalid input or unimplemented sysconf name */