From df648905e7d8340bb3e78813fd25e2077b9685d9 Mon Sep 17 00:00:00 2001 From: Joseph Myers Date: Mon, 17 Dec 2018 18:29:36 +0000 Subject: Add test that MAP_* constants agree with kernel. Continuing the process of building up and using Python infrastructure for extracting and using values in headers, this patch adds a test that MAP_* constants from sys/mman.h agree with those in the Linux kernel headers. (Other sys/mman.h constants could be added to the test separately.) This set of constants has grown over time, so the generic code is enhanced to allow saying extra constants are OK on either side of the comparison (where the caller sets those parameters based on the Linux kernel headers version, compared with the version the headers were last updated from). Although the test is a custom Python file, my intention is to move in future to a single Python script for such tests and text files it takes as inputs, once there are enough examples to provide a guide to the common cases in such tests (I'd like to end up with most or all such sets of constants copied from kernel headers having such tests, and likewise for structure layouts from the kernel). The Makefile code is essentially the same as for tst-signal-numbers, but I didn't try to find an object file to depend on to represent the dependency on the headers used by the test (the conform/ tests don't try to represent such header dependencies at all, for example). Tested with build-many-glibcs.py, and also for x86_64 with older kernel headers. * scripts/glibcextract.py (compare_macro_consts): Take parameters to allow extra macros from first or second sources. * sysdeps/unix/sysv/linux/tst-mman-consts.py: New file. * sysdeps/unix/sysv/linux/Makefile [$(subdir) = misc] (tests-special): Add $(objpfx)tst-mman-consts.out. ($(objpfx)tst-mman-consts.out): New makefile target. --- sysdeps/unix/sysv/linux/Makefile | 9 +++++ sysdeps/unix/sysv/linux/tst-mman-consts.py | 65 ++++++++++++++++++++++++++++++ 2 files changed, 74 insertions(+) create mode 100644 sysdeps/unix/sysv/linux/tst-mman-consts.py (limited to 'sysdeps') diff --git a/sysdeps/unix/sysv/linux/Makefile b/sysdeps/unix/sysv/linux/Makefile index 2c1a7dd274..f8274552a7 100644 --- a/sysdeps/unix/sysv/linux/Makefile +++ b/sysdeps/unix/sysv/linux/Makefile @@ -100,6 +100,15 @@ $(objpfx)tst-sysconf-iov_max: $(objpfx)tst-sysconf-iov_max-uapi.o $(objpfx)tst-pkey: $(shared-thread-library) +tests-special += $(objpfx)tst-mman-consts.out +$(objpfx)tst-mman-consts.out: ../sysdeps/unix/sysv/linux/tst-mman-consts.py + PYTHONPATH=../scripts \ + $(PYTHON) ../sysdeps/unix/sysv/linux/tst-mman-consts.py \ + --cc="$(CC) $(patsubst -DMODULE_NAME=%, \ + -DMODULE_NAME=testsuite, \ + $(CPPFLAGS))" \ + < /dev/null > $@ 2>&1; $(evaluate-test) + endif # $(subdir) == misc ifeq ($(subdir),time) diff --git a/sysdeps/unix/sysv/linux/tst-mman-consts.py b/sysdeps/unix/sysv/linux/tst-mman-consts.py new file mode 100644 index 0000000000..1a613beec0 --- /dev/null +++ b/sysdeps/unix/sysv/linux/tst-mman-consts.py @@ -0,0 +1,65 @@ +#!/usr/bin/python3 +# Test that glibc's sys/mman.h constants match the kernel's. +# Copyright (C) 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 +# . + +import argparse +import sys + +import glibcextract + + +def linux_kernel_version(cc): + """Return the (major, minor) version of the Linux kernel headers.""" + sym_data = ['#include ', 'START', + ('LINUX_VERSION_CODE', 'LINUX_VERSION_CODE')] + val = glibcextract.compute_c_consts(sym_data, cc)['LINUX_VERSION_CODE'] + val = int(val) + return ((val & 0xff0000) >> 16, (val & 0xff00) >> 8) + + +def main(): + """The main entry point.""" + parser = argparse.ArgumentParser( + description="Test that glibc's sys/mman.h constants " + "match the kernel's.") + parser.add_argument('--cc', metavar='CC', + help='C compiler (including options) to use') + args = parser.parse_args() + linux_version_headers = linux_kernel_version(args.cc) + linux_version_glibc = (4, 19) + sys.exit(glibcextract.compare_macro_consts( + '#define _GNU_SOURCE 1\n' + '#include \n', + '#define _GNU_SOURCE 1\n' + '#include \n', + args.cc, + 'MAP_.*', + # A series of MAP_HUGE_ macros are defined by the kernel + # but not by glibc. MAP_UNINITIALIZED is kernel-only. + # MAP_FAILED is not a MAP_* flag and is glibc-only, as is the + # MAP_ANON alias for MAP_ANONYMOUS. MAP_RENAME, MAP_AUTOGROW, + # MAP_LOCAL and MAP_AUTORSRV are in the kernel header for + # MIPS, marked as "not used by linux"; SPARC has MAP_INHERIT + # in the kernel header, but does not use it. + 'MAP_HUGE_[0-9].*|MAP_UNINITIALIZED|MAP_FAILED|MAP_ANON' + '|MAP_RENAME|MAP_AUTOGROW|MAP_LOCAL|MAP_AUTORSRV|MAP_INHERIT', + linux_version_glibc > linux_version_headers, + linux_version_headers > linux_version_glibc)) + +if __name__ == '__main__': + main() -- cgit v1.2.3