source: vendor/current/lib/uid_wrapper/wscript

#!/usr/bin/env python

import Options
import os, sys

VERSION="1.2.0"

def configure(conf):
    if conf.CHECK_BUNDLED_SYSTEM('uid_wrapper', minversion=VERSION, set_target=False):
        conf.DEFINE('USING_SYSTEM_UID_WRAPPER', 1)
        libuid_wrapper_so_path = 'libuid_wrapper.so'
    else:
        # check HAVE_GCC_ATOMIC_BUILTINS
        conf.CHECK_CODE('''
            #include <stdbool.h>
            int main(void) {
                bool x;
                bool *p_x = &x;
                __atomic_load(p_x, &x, __ATOMIC_RELAXED);
                return 0;
            ''',
            'HAVE_GCC_ATOMIC_BUILTINS',
            addmain=False,
            msg='Checking for atomic builtins')

        # check HAVE_GCC_THREAD_LOCAL_STORAGE
        conf.CHECK_CODE('''
            __thread int tls;

            int main(void) {
                return 0;
            }
            ''',
            'HAVE_GCC_THREAD_LOCAL_STORAGE',
            addmain=False,
            msg='Checking for thread local storage')

        if Options.options.address_sanitizer:
            # check HAVE_ADDRESS_SANITIZER_ATTRIBUTE
            conf.CHECK_CODE('''
                void test_address_sanitizer_attribute(void) __attribute__((no_sanitize_address));

                void test_address_sanitizer_attribute(void)
                {
                    return;
                }

                int main(void) {
                    return 0;
                }
                ''',
                'HAVE_ADDRESS_SANITIZER_ATTRIBUTE',
                addmain=False,
                cflags='-Wall -Wextra -Werror',
                msg='Checking for address sanitizer attribute')

        # check HAVE_FUNCTION_ATTRIBUTE_FORMAT
        conf.CHECK_CODE('''
            void log_fn(const char *format, ...) __attribute__ ((format (printf, 1, 2)));

            int main(void) {
                return 0;
            }
            ''',
            'HAVE_FUNCTION_ATTRIBUTE_FORMAT',
            addmain=False,
            msg='Checking for printf format validation support')
        # Prototype checks
        conf.CHECK_C_PROTOTYPE('setgroups',
                        'int setgroups(int ngroups, const gid_t *grouplist)',
                        define='HAVE_SETGROUPS_INT', headers='unistd.h sys/types.h')
        conf.CHECK_C_PROTOTYPE('syscall',
                        'int syscall(int number, ...)',
                        define='HAVE_SYSCALL_INT', headers='unistd.h sys/syscall.h')

        if (sys.platform.rfind('linux') > -1):
            conf.CHECK_CODE('''
#if defined(HAVE_UNISTD_H)
#include <unistd.h>
#endif
#include <stdlib.h>
#include <stdio.h>
#include <sys/types.h>
#include <errno.h>

#ifdef HAVE_SYS_PRIV_H
#include <sys/priv.h>
#endif
#ifdef HAVE_SYS_ID_H
#include <sys/id.h>
#endif

#if defined(HAVE_SYSCALL_H)
#include <syscall.h>
#endif

#if defined(HAVE_SYS_SYSCALL_H)
#include <sys/syscall.h>
#endif

syscall(SYS_setresuid32, -1, -1, -1);
syscall(SYS_setresgid32, -1, -1, -1);
syscall(SYS_setreuid32, -1, -1);
syscall(SYS_setregid32, -1, -1);
syscall(SYS_setuid32, -1);
syscall(SYS_setgid32, -1);
syscall(SYS_setgroups32, 0, NULL);
''',
                'HAVE_LINUX_32BIT_SYSCALLS',
                msg="Checking whether Linux has 32-bit credential calls");

        conf.CHECK_FUNCS('getresuid getresgid')

        # Create full path to uid_wrapper
        srcdir = os.path.realpath(conf.srcdir)
        libuid_wrapper_so_path = srcdir + '/bin/default/lib/uid_wrapper/libuid-wrapper.so'

    conf.DEFINE('LIBUID_WRAPPER_SO_PATH', libuid_wrapper_so_path)
    conf.DEFINE('UID_WRAPPER', 1)

def build(bld):
    if not bld.CONFIG_SET("USING_SYSTEM_UID_WRAPPER"):
        # We need to do it this way or the library wont work.
        # Using private_library=True will add symbol version which
        # breaks preloading!
        bld.SAMBA_LIBRARY('uid_wrapper',
                          source='uid_wrapper.c',
                          deps='dl',
                          install=False,
                          realname='libuid-wrapper.so')