1 files changed, 81 insertions, 0 deletions
diff --git a/sysdeps/unix/sysv/linux/gen-syscall-h.awk b/sysdeps/unix/sysv/linux/gen-syscall-h.awk
new file mode 100644
index 0000000000..4a264a29a7
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/gen-syscall-h.awk
@@ -0,0 +1,81 @@
+# Generate SYS_* macros from a list in a text file.
+# Copyright (C) 2017-2018 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/>.
+
+# Emit a conditional definition for SYS_NAME.
+function emit(name) {
+    print "#ifdef __NR_" name;
+    print "# define SYS_" name " __NR_" name;
+    print "#endif";
+    print "";
+}
+
+# Bail out with an error.
+function fatal(message) {
+    print FILENAME ":" FNR ": " message > "/dev/stderr";
+    exit 1;
+}
+
+BEGIN {
+    name = "";
+    kernel = "";
+}
+
+# Skip empty lines and comments.
+/^\s*(|#.*)$/ {
+    next;
+}
+
+# Kernel version.  Used for documentation purposes only.
+/^kernel [0-9.]+$/ {
+    if (kernel != "") {
+        fatal("duplicate kernel directive");
+    }
+    kernel = $2;
+    print "/* Generated at libc build time from syscall list.  */";
+    print "/* The system call list corresponds to kernel " kernel ".  */";
+    print "";
+    print "#ifndef _SYSCALL_H"
+    print "# error \"Never use <bits/syscall.h> directly; include <sys/syscall.h> instead.\"";
+    print "#endif";
+    print "";
+    split($2, kernel_version, ".");
+    kernel_major = kernel_version[1];
+    kernel_minor = kernel_version[2];
+    kernel_version_code = kernel_major * 65536 + kernel_minor * 256;
+    print "#define __GLIBC_LINUX_VERSION_CODE " kernel_version_code;
+    print "";
+    next;
+}
+
+# If there is just one word, it is a system call.
+/^[a-zA-Z_][a-zA-Z0-9_]+$/ {
+    if (kernel == "") {
+        fatal("expected kernel directive before this line");
+    }
+    if ($1 <= name) {
+        fatal("name " name " violates ordering");
+    }
+    emit($1);
+    name = $1;
+    next;
+}
+
+# The rest has to be syntax errors.
+// {
+    fatal("unrecognized syntax");
+}