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#!/usr/bin/python3
# Regenerate <arch-syscall.h> and update syscall-names.list.
# Copyright (C) 2020 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/>.
import argparse
import io
import os
import sys
import glibcextract
import glibcsyscalls
def atomic_replace(path, contents):
"""Atomically replace PATH with CONTENTS, via a temporary file.
The name of the temporary file is predictable, so locking is
required to avoid corruption.
"""
path_tmp = path + 'T'
with open(path_tmp, 'w') as tmp:
tmp.write(contents)
ok = False
try:
os.rename(path_tmp, path)
ok = True
finally:
# On error, try to delete the temporary file.
if not ok:
try:
os.unlink(path_tmp)
except:
pass
def main():
"""The main entry point."""
parser = argparse.ArgumentParser(
description='System call list consistency checks')
parser.add_argument('--cc', metavar='CC', required=True,
help='C compiler (including options) to use')
parser.add_argument('--lock', metavar='PATH', required=True,
help='file to lock during the updates')
parser.add_argument('arch_syscall', metavar='ARCH-SYSCALL-H',
help='The <arch-syscall.h> file to update')
parser.add_argument('names_list', metavar='SYSCALL-NAMES-LIST',
help='The syscall name list to update ')
args = parser.parse_args()
kernel_constants = glibcsyscalls.kernel_constants(args.cc)
with open(args.lock, 'r+') as lockfile:
os.lockf(lockfile.fileno(), os.F_LOCK, 0)
# Replace <arch-syscall.h> with data derived from kernel headers.
# No merging is necessary here. Arch-specific changes should go
# into <fixup-unistd-asm.h>.
out = io.StringIO()
out.write('/* AUTOGENERATED by update-syscall-lists.py. */\n')
for name, value in sorted(kernel_constants.items()):
out.write('#define __NR_{} {}\n'.format(name, value))
atomic_replace(args.arch_syscall, out.getvalue())
# Merge the architecture-specific system call names into the
# global names list, syscall-names.list. This file contains names
# from other architectures (and comments), so it is necessary to
# merge the existing files with the names obtained from the
# kernel.
with open(args.names_list, 'r') as list_file:
names_list = glibcsyscalls.SyscallNamesList(list_file)
merged = names_list.merge(kernel_constants.keys())
out = io.StringIO()
for line in merged:
out.write(line)
atomic_replace(args.names_list, out.getvalue())
if __name__ == '__main__':
main()
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