1 files changed, 66 insertions, 0 deletions
diff --git a/stdlib/make-errno-constants.awk b/stdlib/make-errno-constants.awk
new file mode 100644
index 0000000000..32344dca95
--- /dev/null
+++ b/stdlib/make-errno-constants.awk
@@ -0,0 +1,66 @@
+# Copyright (C) 2017 Free Software Foundation, Inc.
+# This file is part of the GNU C Library.
+
+# The GNU C Library is free software; you can redistribute it and/or
+# modify it under the terms of the GNU Lesser General Public
+# License as published by the Free Software Foundation; either
+# version 2.1 of the License, or (at your option) any later version.
+
+# The GNU C Library is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+# Lesser General Public License for more details.
+
+# You should have received a copy of the GNU Lesser General Public
+# License along with the GNU C Library; if not, see
+# <http://www.gnu.org/licenses/>.
+
+# Generate errno_constants.pysym from errno.texi.
+# errno.texi contains lines like:
+# @errno{ENOSYS, 123, Function not implemented}
+# The number is only relevant for the Hurd.
+
+BEGIN {
+    print "#include <errno.h>"
+    print ""
+    print "-- Errno constants"
+
+    # Some error constants do not exist on all supported operating systems.
+    # FIXME: Encode this information in errno.texi.
+    ## (Sometimes) two names for the same number
+    optional["EDEADLOCK"]	= 1
+    optional["EDEADLK"]		= 1
+    optional["EOPNOTSUPP"]	= 1
+    optional["ENOTSUP"]		= 1
+    optional["EWOULDBLOCK"]	= 1
+    optional["EAGAIN"]		= 1
+    ## BSD-specific
+    optional["EAUTH"]		= 1
+    optional["EBADRPC"]		= 1
+    optional["EFTYPE"]		= 1
+    optional["ENEEDAUTH"]	= 1
+    optional["EPROCLIM"]	= 1
+    optional["EPROCUNAVAIL"]	= 1
+    optional["EPROGMISMATCH"]	= 1
+    optional["EPROGUNAVAIL"]	= 1
+    optional["ERPCMISMATCH"]	= 1
+    ## GNU-specific
+    optional["EBACKGROUND"]	= 1
+    optional["ED"]		= 1
+    optional["EDIED"]		= 1
+    optional["EGRATUITOUS"]	= 1
+    optional["EGREGIOUS"]	= 1
+    optional["EIEIO"]		= 1
+}
+
+/^@errno\{/ {
+    e = substr($1, 8, length($1)-8)
+    if (e in optional)
+      {
+	print "#ifdef", e
+	print e
+	print "#endif"
+      }
+    else
+	print e
+}