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#!/usr/bin/env python3
#
# Copyright (C) 2015 The Android Open Source Project
#
# Licensed under the Apache License, Version 2.0 (the 'License');
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an 'AS IS' BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
# pylint: disable=bad-indentation,bad-continuation
import glob
import os
import re
import sys
import symbols
only_unwanted = False
if len(sys.argv) > 1:
if sys.argv[1] in ('-u', '--unwanted'):
only_unwanted = True
toolchain = os.environ['ANDROID_TOOLCHAIN']
arch = re.sub(r'.*/linux-x86/([^/]+)/.*', r'\1', toolchain)
if arch == 'aarch64':
arch = 'arm64'
def MangleGlibcNameToBionic(name):
if name in glibc_to_bionic_names:
return glibc_to_bionic_names[name]
return name
def GetNdkIgnored(arch): # pylint: disable=redefined-outer-name
ignored_symbols = set()
files = glob.glob('%s/ndk/build/tools/unwanted-symbols/%s/*' %
(os.getenv('ANDROID_BUILD_TOP'), arch))
for f in files:
ignored_symbols |= set(open(f, 'r').read().splitlines())
return ignored_symbols
glibc_to_bionic_names = {
'__res_init': 'res_init',
'__res_mkquery': 'res_mkquery',
'__res_query': 'res_query',
'__res_search': 'res_search',
'__xpg_basename': '__gnu_basename',
}
glibc = symbols.GetFromSystemSo([
'libc.so.*',
'librt.so.*',
'libpthread.so.*',
'libresolv.so.*',
'libm.so.*',
'libutil.so.*',
])
bionic = symbols.GetFromAndroidSo(['libc.so', 'libm.so'])
this_dir = os.path.dirname(os.path.realpath(__file__))
posix = symbols.GetFromTxt(os.path.join(this_dir, 'posix-2013.txt'))
ndk_ignored = GetNdkIgnored(arch)
glibc = set(map(MangleGlibcNameToBionic, glibc))
# bionic includes various BSD symbols to ease porting other BSD-licensed code.
bsd_stuff = set([
'arc4random',
'arc4random_buf',
'arc4random_uniform',
'basename_r',
'dirname_r',
'fgetln',
'fpurge',
'funopen',
'funopen64',
'gamma_r',
'gammaf_r',
'getprogname',
'setprogname',
'strlcat',
'strlcpy',
'sys_signame',
'wcslcat',
'wcslcpy',
])
# Some symbols are part of the FORTIFY implementation.
FORTIFY_stuff = set([
'__FD_CLR_chk',
'__FD_ISSET_chk',
'__FD_SET_chk',
'__fwrite_chk',
'__memchr_chk',
'__memrchr_chk',
'__pwrite64_chk',
'__pwrite_chk',
'__sendto_chk',
'__stack_chk_guard',
'__stpncpy_chk2',
'__strchr_chk',
'__strlcat_chk',
'__strlcpy_chk',
'__strlen_chk',
'__strncpy_chk2',
'__strrchr_chk',
'__umask_chk',
'__write_chk',
])
# Some symbols are used to implement public functions/macros.
macro_stuff = set([
'__assert2',
'__errno',
'__fe_dfl_env',
'__get_h_errno',
'__gnu_strerror_r',
'__fpclassifyd',
'__isfinite',
'__isfinitef',
'__isfinitel',
'__isnormal',
'__isnormalf',
'__isnormall',
'__sF',
'__pthread_cleanup_pop',
'__pthread_cleanup_push',
])
# bionic exposes various Linux features that glibc doesn't.
linux_stuff = set([
'getauxval',
'gettid',
'pthread_gettid_np',
'tgkill',
])
# Some standard stuff isn't yet in the versions of glibc we're using.
std_stuff = set([
'at_quick_exit',
'c16rtomb',
'c32rtomb',
'mbrtoc16',
'mbrtoc32',
])
# These have mangled names in glibc, with a macro taking the "obvious" name.
weird_stuff = set([
'fstat',
'fstat64',
'fstatat',
'fstatat64',
'isfinite',
'isfinitef',
'isfinitel',
'isnormal',
'isnormalf',
'isnormall',
'lstat',
'lstat64',
'mknod',
'mknodat',
'stat',
'stat64',
'optreset',
'sigsetjmp',
])
# These exist in glibc, but under slightly different names (generally one extra
# or one fewer _). TODO: check against glibc names.
libresolv_stuff = set([
'__res_send_setqhook',
'__res_send_setrhook',
'_resolv_delete_cache_for_net',
'_resolv_flush_cache_for_net',
'_resolv_set_nameservers_for_net',
'dn_expand',
'nsdispatch',
])
# Implementation details we know we export (and can't get away from).
known = set([
'_ctype_',
'__libc_init',
])
# POSIX has some stuff that's unusable in the modern world (a64l) or not
# actually implemented in glibc unless you count always failing with ENOSYS
# as being implemented (fattach). Other stuff (fmtmsg) isn't used in any
# codebase I have access to, internal or external.
in_posix_and_glibc_but_dead_or_useless = set([
'a64l', # obsolete
'confstr', # obsolete
'endutxent', # no utmp on Android
'fattach', # <stropts.h> marked obsolescent
'fdetach', # <stropts.h> marked obsolescent
'fmtmsg', # unused
'getdate', # unused
'getdate_err', # unused
'gethostid', # obsolete
'getmsg', # <stropts.h> marked obsolescent
'getpmsg', # <stropts.h> marked obsolescent
'getutxent', # no utmp on Android
'getutxid', # no utmp on Android
'getutxline', # no utmp on Android
'isastream', # <stropts.h> marked obsolescent
'l64a', # obsolete
'mq_close', # disallowed by SELinux
'mq_getattr', # disallowed by SELinux
'mq_notify', # disallowed by SELinux
'mq_open', # disallowed by SELinux
'mq_receive', # disallowed by SELinux
'mq_send', # disallowed by SELinux
'mq_setattr', # disallowed by SELinux
'mq_timedreceive', # disallowed by SELinux
'mq_timedsend', # disallowed by SELinux
'mq_unlink', # disallowed by SELinux
'pthread_getconcurrency', # marked obsolescent
'pthread_setconcurrency', # marked obsolescent
'putmsg', # <stropts.h> marked obsolescent
'putpmsg', # <stropts.h> marked obsolescent
'pututxline', # no utmp on Android
'shm_open', # disallowed by SELinux
'shm_unlink', # disallowed by SELinux
'setutxent', # no utmp on Android
'sockatmark', # obsolete (https://tools.ietf.org/html/rfc6093)
'strfmon', # icu4c
'strfmon_l', # icu4c
'ulimit', # <ulimit.h> marked obsolescent
])
posix = posix - in_posix_and_glibc_but_dead_or_useless
glibc = glibc - in_posix_and_glibc_but_dead_or_useless
if not only_unwanted:
#print('glibc:')
#for symbol in sorted(glibc):
# print(symbol)
#print()
#print('bionic:')
#for symbol in sorted(bionic):
# print(symbol)
#print()
print('in glibc (but not posix) but not bionic:')
for symbol in sorted((glibc - posix).difference(bionic)):
print(symbol)
print()
print('in posix (and implemented in glibc) but not bionic:')
for symbol in sorted((posix.intersection(glibc)).difference(bionic)):
print(symbol)
print()
print('in bionic but not glibc:')
allowed_stuff = (bsd_stuff | FORTIFY_stuff | linux_stuff | macro_stuff |
std_stuff | weird_stuff | libresolv_stuff | known)
for symbol in sorted((bionic - allowed_stuff).difference(glibc)):
if symbol in ndk_ignored:
symbol += '*'
print(symbol)
sys.exit(0)
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