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94 lines
3.4 KiB
Python
94 lines
3.4 KiB
Python
#!/usr/bin/python3
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# Regenerate <arch-syscall.h> and update syscall-names.list.
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# Copyright (C) 2020-2024 Free Software Foundation, Inc.
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# This file is part of the GNU C Library.
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#
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# The GNU C Library is free software; you can redistribute it and/or
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# modify it under the terms of the GNU Lesser General Public
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# License as published by the Free Software Foundation; either
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# version 2.1 of the License, or (at your option) any later version.
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#
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# The GNU C Library is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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# Lesser General Public License for more details.
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#
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# You should have received a copy of the GNU Lesser General Public
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# License along with the GNU C Library; if not, see
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# <http://www.gnu.org/licenses/>.
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import argparse
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import io
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import os
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import sys
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import glibcextract
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import glibcsyscalls
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def atomic_replace(path, contents):
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"""Atomically replace PATH with CONTENTS, via a temporary file.
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The name of the temporary file is predictable, so locking is
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required to avoid corruption.
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"""
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path_tmp = path + 'T'
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with open(path_tmp, 'w') as tmp:
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tmp.write(contents)
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ok = False
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try:
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os.rename(path_tmp, path)
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ok = True
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finally:
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# On error, try to delete the temporary file.
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if not ok:
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try:
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os.unlink(path_tmp)
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except:
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pass
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def main():
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"""The main entry point."""
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parser = argparse.ArgumentParser(
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description='System call list consistency checks')
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parser.add_argument('--cc', metavar='CC', required=True,
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help='C compiler (including options) to use')
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parser.add_argument('--lock', metavar='PATH', required=True,
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help='file to lock during the updates')
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parser.add_argument('arch_syscall', metavar='ARCH-SYSCALL-H',
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help='The <arch-syscall.h> file to update')
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parser.add_argument('names_list', metavar='SYSCALL-NAMES-LIST',
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help='The syscall name list to update ')
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args = parser.parse_args()
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kernel_constants = glibcsyscalls.kernel_constants(args.cc)
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with open(args.lock, 'r+') as lockfile:
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os.lockf(lockfile.fileno(), os.F_LOCK, 0)
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# Replace <arch-syscall.h> with data derived from kernel headers.
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# No merging is necessary here. Arch-specific changes should go
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# into <fixup-unistd-asm.h>.
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out = io.StringIO()
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out.write('/* AUTOGENERATED by update-syscall-lists.py. */\n')
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for name, value in sorted(kernel_constants.items()):
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out.write('#define __NR_{} {}\n'.format(name, value))
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atomic_replace(args.arch_syscall, out.getvalue())
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# Merge the architecture-specific system call names into the
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# global names list, syscall-names.list. This file contains names
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# from other architectures (and comments), so it is necessary to
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# merge the existing files with the names obtained from the
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# kernel.
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with open(args.names_list, 'r') as list_file:
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names_list = glibcsyscalls.SyscallNamesList(list_file)
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merged = names_list.merge(kernel_constants.keys())
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out = io.StringIO()
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for line in merged:
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out.write(line)
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atomic_replace(args.names_list, out.getvalue())
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if __name__ == '__main__':
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main()
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