e0f1178079
ld: .libs/persona.o: relocation R_X86_64_PC32 against undefined symbol `_ZN12_GLOBAL__N_128SystemConfigurationParameterILj70EE8SpellingE' can not be used when making a shared object; recompile with -fPIC
127 lines
3.5 KiB
C++
127 lines
3.5 KiB
C++
/* vim: set sw=4 sts=4 et foldmethod=syntax : */
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/*
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* Copyright (c) 2016 Saleem Abdulrasool
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*
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* This file is part of the Paludis package manager. Paludis is free software;
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* you can redistribute it and/or modify it under the terms of the GNU General
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* Public License version 2, as published by the Free Software Foundation.
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*
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* Paludis is distributed in the hope that it will be useful, but WITHOUT ANY
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* WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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* FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
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* details.
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*
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* You should have received a copy of the GNU General Public License along with
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* this program; if not, write to the Free Software Foundation, Inc., 59 Temple
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* Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <paludis/util/persona.hh>
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#include <paludis/util/log.hh>
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#include <stdlib.h>
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#include <unistd.h>
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#include <sys/types.h>
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namespace
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{
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template <unsigned Name>
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struct SystemConfigurationParameter
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{
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static const char * const Spelling;
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};
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template <>
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const char * const SystemConfigurationParameter<_SC_GETPW_R_SIZE_MAX>::Spelling = "_SC_GETPW_R_SIZE_MAX";
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template <>
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const char * const SystemConfigurationParameter<_SC_GETGR_R_SIZE_MAX>::Spelling = "_SC_GETGR_R_SIZE_MAX";
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template <unsigned Name, size_t DefaultSize = 1024, long DodgyLimit = 1024 * 128>
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size_t initial_buffer_size(const char *context)
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{
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using namespace paludis;
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long size;
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errno = 0;
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size = ::sysconf(Name);
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if (size == -1 && errno == 0)
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return DefaultSize;
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if (size > DodgyLimit)
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Log::get_instance()->message(context, ll_warning, lc_context)
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<< "Got dodgy value " << size << " from "
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<< "sysconf(" << SystemConfigurationParameter<Name>::Spelling << ")";
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return std::min(size, DodgyLimit);
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}
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}
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namespace paludis
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{
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int getpwnam_r_s(const char *name, std::vector<char> & buffer,
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struct passwd & pwd, struct passwd * & result)
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{
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size_t length;
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int rv;
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buffer.clear();
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length =
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initial_buffer_size<_SC_GETPW_R_SIZE_MAX>("accounts.getpw_r_size");
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for (buffer.resize(length);
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(rv = ::getpwnam_r(name, &pwd, buffer.data(), buffer.capacity(),
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&result)) == ERANGE;
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buffer.resize(length))
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length = length * 2;
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return rv;
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}
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int getgrgid_r_s(gid_t gid, std::vector<char> & buffer,
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struct group & grp, struct group * & result)
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{
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size_t length;
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int rv;
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buffer.clear();
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length =
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initial_buffer_size<_SC_GETGR_R_SIZE_MAX>("accounts.getgr_r_size");
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for (buffer.resize(length);
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(rv = ::getgrgid_r(gid, &grp, buffer.data(), buffer.capacity(),
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&result)) == ERANGE;
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buffer.resize(length))
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length = length * 2;
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return rv;
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}
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int getpwuid_r_s(uid_t uid, std::vector<char> & buffer,
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struct passwd & pwd, struct passwd * & result)
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{
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size_t length;
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int rv;
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buffer.clear();
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length =
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initial_buffer_size<_SC_GETPW_R_SIZE_MAX>("accounts.getpw_r_size");
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for (buffer.resize(length);
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(rv = ::getpwuid_r(uid, &pwd, buffer.data(), buffer.capacity(),
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&result)) == ERANGE;
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buffer.resize(length))
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length = length * 2;
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return rv;
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}
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}
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