path: root/lib/replace/wscript

#!/usr/bin/env python

APPNAME = 'libreplace'
VERSION = '1.2.1'

import sys
import os

# find the buildtools directory
top = '.'
while not os.path.exists(top+'/buildtools') and len(top.split('/')) < 5:
    top = top + '/..'
sys.path.insert(0, top + '/buildtools/wafsamba')

out = 'bin'

import wafsamba
from wafsamba import samba_dist
from waflib import Options, Utils, Logs, Context

samba_dist.DIST_DIRS('lib/replace buildtools:buildtools third_party/waf:third_party/waf')

def options(opt):
    opt.BUILTIN_DEFAULT('NONE')
    opt.PRIVATE_EXTENSION_DEFAULT('')
    opt.RECURSE('buildtools/wafsamba')

@Utils.run_once
def configure(conf):
    conf.RECURSE('buildtools/wafsamba')

    conf.env.standalone_replace = conf.IN_LAUNCH_DIR()

    if sys.platform.rfind('linux') > -1:
        conf.DEFINE('LINUX', '1')

    conf.DEFINE('BOOL_DEFINED', 1)
    conf.DEFINE('HAVE_LIBREPLACE', 1)
    conf.DEFINE('LIBREPLACE_NETWORK_CHECKS', 1)

    conf.CHECK_HEADERS('linux/types.h crypt.h locale.h acl/libacl.h compat.h')
    conf.CHECK_HEADERS('acl/libacl.h attr/xattr.h compat.h ctype.h dustat.h')
    conf.CHECK_HEADERS('fcntl.h fnmatch.h glob.h history.h krb5.h langinfo.h')
    conf.CHECK_HEADERS('locale.h ndir.h pwd.h')
    conf.CHECK_HEADERS('shadow.h sys/acl.h')
    conf.CHECK_HEADERS('sys/attributes.h attr/attributes.h sys/capability.h sys/dir.h sys/epoll.h')
    conf.CHECK_HEADERS('sys/fcntl.h sys/filio.h sys/filsys.h sys/fs/s5param.h')
    conf.CHECK_HEADERS('sys/id.h sys/ioctl.h sys/ipc.h sys/mman.h sys/mode.h sys/ndir.h sys/priv.h')
    conf.CHECK_HEADERS('sys/resource.h sys/security.h sys/shm.h sys/statfs.h sys/statvfs.h sys/termio.h')
    conf.CHECK_HEADERS('sys/vfs.h sys/xattr.h termio.h termios.h sys/file.h')
    conf.CHECK_HEADERS('sys/ucontext.h sys/wait.h sys/stat.h')

    if not conf.CHECK_DECLS('malloc', headers='stdlib.h'):
        conf.CHECK_HEADERS('malloc.h')

    conf.CHECK_HEADERS('grp.h')
    conf.CHECK_HEADERS('sys/select.h setjmp.h utime.h sys/syslog.h syslog.h')
    conf.CHECK_HEADERS('stdarg.h vararg.h sys/mount.h mntent.h')
    conf.CHECK_HEADERS('stropts.h unix.h string.h strings.h sys/param.h limits.h')
    conf.CHECK_HEADERS('''sys/socket.h netinet/in.h netdb.h arpa/inet.h netinet/in_systm.h
                          netinet/ip.h netinet/tcp.h netinet/in_ip.h
                          sys/sockio.h sys/un.h''', together=True)
    conf.CHECK_HEADERS('sys/uio.h ifaddrs.h direct.h dirent.h')
    conf.CHECK_HEADERS('windows.h winsock2.h ws2tcpip.h')
    conf.CHECK_HEADERS('errno.h')
    conf.CHECK_HEADERS('getopt.h iconv.h')
    conf.CHECK_HEADERS('memory.h nss.h sasl/sasl.h')
    conf.CHECK_HEADERS('linux/openat2.h')

    conf.CHECK_FUNCS_IN('inotify_init', 'inotify', checklibc=True,
                        headers='sys/inotify.h')

    conf.CHECK_HEADERS('security/pam_appl.h zlib.h asm/unistd.h')
    conf.CHECK_HEADERS('sys/unistd.h alloca.h float.h')

    conf.SET_TARGET_TYPE('tirpc', 'EMPTY')

    if conf.CHECK_CODE(
            '\n#ifndef _TIRPC_RPC_H\n#error "no tirpc headers in system path"\n#endif\n',
            'HAVE_RPC_RPC_HEADERS',
            headers=['rpc/rpc.h', 'rpc/nettype.h'],
            msg='Checking for tirpc rpc headers in default system path'):
        if conf.CONFIG_SET('HAVE_RPC_RPC_H'):
            conf.undefine('HAVE_RPC_RPC_H')

    if not conf.CONFIG_SET('HAVE_RPC_RPC_H'):
        if conf.CHECK_CFG(package='libtirpc', args='--cflags --libs',
                       msg='Checking for libtirpc headers',
                       uselib_store='TIRPC'):
            conf.CHECK_HEADERS('rpc/rpc.h rpc/nettype.h', lib='tirpc', together=True)
            conf.SET_TARGET_TYPE('tirpc', 'SYSLIB')
    if not conf.CONFIG_SET('HAVE_RPC_RPC_H'):
        if conf.CHECK_CFG(package='libntirpc', args='--cflags',
                       msg='Checking for libntirpc headers',
                       uselib_store='TIRPC'):
            conf.CHECK_HEADERS('rpc/rpc.h rpc/nettype.h', lib='tirpc', together=True)
            conf.SET_TARGET_TYPE('tirpc', 'SYSLIB')
    if not conf.CONFIG_SET('HAVE_RPC_RPC_H'):
            Logs.warn('No rpc/rpc.h header found, tirpc or libntirpc missing?')

    # This file is decprecated with glibc >= 2.30 so we need to check if it
    # includes a deprecation warning:
    # #warning "The <sys/sysctl.h> header is deprecated and will be removed."
    conf.CHECK_CODE('''
                    #include <sys/sysctl.h>
                    int main(void) { return 0; }
                    ''',
                    define='HAVE_SYS_SYSCTL_H',
                    cflags=['-Werror=cpp'],
                    addmain=False,
                    msg='Checking for header sys/sysctl.h')

    conf.CHECK_HEADERS('sys/fileio.h sys/filesys.h sys/dustat.h sys/sysmacros.h')
    conf.CHECK_HEADERS('xfs/libxfs.h netgroup.h')

    conf.CHECK_HEADERS('valgrind.h valgrind/valgrind.h')
    conf.CHECK_HEADERS('valgrind/memcheck.h valgrind/helgrind.h')
    conf.CHECK_HEADERS('nss_common.h nsswitch.h ns_api.h')
    conf.CHECK_HEADERS('sys/extattr.h sys/ea.h sys/proplist.h sys/cdefs.h')
    conf.CHECK_HEADERS('utmp.h utmpx.h lastlog.h')
    conf.CHECK_HEADERS('syscall.h sys/syscall.h inttypes.h')
    conf.CHECK_HEADERS('sys/atomic.h stdatomic.h')
    conf.CHECK_HEADERS('libgen.h')

    if conf.CHECK_CFLAGS('-Wno-format-truncation'):
        conf.define('HAVE_WNO_FORMAT_TRUNCATION', '1')

    if conf.CHECK_CFLAGS('-Wno-unused-function'):
        conf.define('HAVE_WNO_UNUSED_FUNCTION', '1')

    if conf.CHECK_CFLAGS('-Wno-strict-overflow'):
        conf.define('HAVE_WNO_STRICT_OVERFLOW', '1')

    if conf.CHECK_CFLAGS('-Wuse-after-free=1'):
        conf.define('HAVE_WUSE_AFTER_FREE_1', '1')

    # Check for process set name support
    conf.CHECK_CODE('''
                    #include <sys/prctl.h>
                    int main(void) {
                        prctl(0);
                        return 0;
                    }
                    ''',
                    'HAVE_PRCTL',
                    addmain=False,
                    headers='sys/prctl.h',
                    msg='Checking for prctl syscall')

    conf.CHECK_CODE('''
                    #include <unistd.h>
                    #ifdef HAVE_FCNTL_H
                    #include <fcntl.h>
                    #endif
                    int main(void) { int fd = open("/dev/null", O_DIRECT); }
                    ''',
                    define='HAVE_OPEN_O_DIRECT',
                    addmain=False,
                    msg='Checking for O_DIRECT flag to open(2)')

    conf.CHECK_TYPES('"long long" intptr_t uintptr_t ptrdiff_t comparison_fn_t')
    if not conf.CHECK_TYPE('bool', define='HAVE_BOOL', headers='stdbool.h'):
            raise Errors.WafError('Samba requires a genuine boolean type')

    conf.CHECK_TYPE('int8_t', 'char')
    conf.CHECK_TYPE('uint8_t', 'unsigned char')
    conf.CHECK_TYPE('int16_t', 'short')
    conf.CHECK_TYPE('uint16_t', 'unsigned short')
    conf.CHECK_TYPE('int32_t', 'int')
    conf.CHECK_TYPE('uint32_t', 'unsigned')
    conf.CHECK_TYPE('int64_t', 'long long')
    conf.CHECK_TYPE('uint64_t', 'unsigned long long')
    conf.CHECK_TYPE('size_t', 'unsigned int')
    conf.CHECK_TYPE('ssize_t', 'int')
    conf.CHECK_TYPE('ino_t', 'unsigned')
    conf.CHECK_TYPE('loff_t', 'off_t')
    conf.CHECK_TYPE('offset_t', 'loff_t')
    conf.CHECK_TYPE('volatile int', define='HAVE_VOLATILE')
    conf.CHECK_TYPE('uint_t', 'unsigned int')
    conf.CHECK_TYPE('blksize_t', 'long', headers='sys/types.h sys/stat.h unistd.h')
    conf.CHECK_TYPE('blkcnt_t', 'long', headers='sys/types.h sys/stat.h unistd.h')

    conf.CHECK_SIZEOF('bool char int "long long" long short size_t ssize_t')
    conf.CHECK_SIZEOF('int8_t uint8_t int16_t uint16_t int32_t uint32_t int64_t uint64_t')
    conf.CHECK_SIZEOF('void*', define='SIZEOF_VOID_P')
    conf.CHECK_SIZEOF('off_t dev_t ino_t time_t')

    conf.CHECK_TYPES('socklen_t', headers='sys/socket.h')
    conf.CHECK_TYPE_IN('struct ifaddrs', 'ifaddrs.h')
    conf.CHECK_TYPE_IN('struct addrinfo', 'netdb.h')
    conf.CHECK_TYPE_IN('struct sockaddr', 'sys/socket.h')
    conf.CHECK_CODE('struct sockaddr_in6 x', define='HAVE_STRUCT_SOCKADDR_IN6',
                    headers='sys/socket.h netdb.h netinet/in.h')
    conf.CHECK_TYPE_IN('struct sockaddr_storage', 'sys/socket.h')
    conf.CHECK_TYPE_IN('sa_family_t', 'sys/socket.h')

    conf.CHECK_TYPE_IN('sig_atomic_t', 'signal.h', define='HAVE_SIG_ATOMIC_T_TYPE')
    conf.CHECK_FUNCS('sigsetmask siggetmask sigprocmask sigblock sigaction sigset')

    # Those functions are normally available in libc
    if not conf.CHECK_FUNCS('''
                            inet_ntoa
                            inet_aton
                            inet_ntop
                            inet_pton
                            connect
                            gethostbyname
                            getaddrinfo
                            getnameinfo
                            freeaddrinfo
                            gai_strerror
                            socketpair''',
                            headers='sys/socket.h netinet/in.h arpa/inet.h netdb.h'):
        conf.CHECK_FUNCS_IN('''
                            inet_ntoa
                            inet_aton
                            inet_ntop
                            inet_pton
                            connect
                            gethostbyname
                            getaddrinfo
                            getnameinfo
                            freeaddrinfo
                            gai_strerror
                            socketpair''',
                            'socket nsl',
                            headers='sys/socket.h netinet/in.h arpa/inet.h netdb.h')
        conf.DEFINE('REPLACE_REQUIRES_LIBSOCKET_LIBNSL', 1)

    conf.CHECK_FUNCS('memset_s memset_explicit')

    conf.CHECK_CODE('''
                    #include <string.h>

                    int main(void)
                    {
                        char buf[] = "This is some content";
                        memset(buf, '\0', sizeof(buf)); __asm__ volatile("" : : "g"(&buf) : "memory");
                        return 0;
                    }
                    ''',
                    define='HAVE_GCC_VOLATILE_MEMORY_PROTECTION',
                    addmain=False,
                    msg='Checking for volatile memory protection',
                    local_include=False)

    # Some old Linux systems have broken header files and
    # miss the IPV6_V6ONLY define in netinet/in.h,
    # but have it in linux/in6.h.
    # We can't include both files so we just check if the value
    # if defined and do the replacement in system/network.h
    if not conf.CHECK_VARIABLE('IPV6_V6ONLY',
                               headers='sys/socket.h netdb.h netinet/in.h'):
        conf.CHECK_CODE('''
                        #include <linux/in6.h>
                        #if (IPV6_V6ONLY != 26)
                        #error no IPV6_V6ONLY support on linux
                        #endif
                        int main(void) { return IPV6_V6ONLY; }
                        ''',
                        define='HAVE_LINUX_IPV6_V6ONLY_26',
                        addmain=False,
                        msg='Checking for IPV6_V6ONLY in linux/in6.h',
                        local_include=False)

    conf.CHECK_CODE('''
                       struct sockaddr_storage sa_store;
                       struct addrinfo *ai = NULL;
                       struct in6_addr in6addr;
                       int idx = if_nametoindex("iface1");
                       int s = socket(AF_INET6, SOCK_STREAM, 0);
                       int ret = getaddrinfo(NULL, NULL, NULL, &ai);
                       if (ret != 0) {
                           const char *es = gai_strerror(ret);
                       }
                       freeaddrinfo(ai);
                       {
                          int val = 1;
                          #ifdef HAVE_LINUX_IPV6_V6ONLY_26
                          #define IPV6_V6ONLY 26
                          #endif
                          ret = setsockopt(s, IPPROTO_IPV6, IPV6_V6ONLY,
                                           (const void *)&val, sizeof(val));
                       }
                       ''',
                    define='HAVE_IPV6',
                    lib='nsl socket',
                    headers='sys/socket.h netdb.h netinet/in.h net/if.h')

    if conf.CONFIG_SET('HAVE_SYS_UCONTEXT_H') and conf.CONFIG_SET('HAVE_SIGNAL_H'):
        conf.CHECK_CODE('''
                       ucontext_t uc;
                       sigaddset(&uc.uc_sigmask, SIGUSR1);
                       ''',
                       'HAVE_UCONTEXT_T',
                       msg="Checking whether we have ucontext_t",
                       headers='signal.h sys/ucontext.h')

    # Check for atomic builtins. */
    conf.CHECK_CODE('''
                    int i;
                    (void)__sync_fetch_and_add(&i, 1);
                    ''',
                    'HAVE___SYNC_FETCH_AND_ADD',
                    msg='Checking for __sync_fetch_and_add compiler builtin')

    conf.CHECK_CODE('''
                    int i;
                    (void)__sync_add_and_fetch(&i, 1);
                    ''',
                    'HAVE___SYNC_ADD_AND_FETCH',
                    msg='Checking for __sync_add_and_fetch compiler builtin')

    conf.CHECK_CODE('''
                    int32_t i;
                    atomic_add_32(&i, 1);
                    ''',
                    'HAVE_ATOMIC_ADD_32',
                    headers='stdint.h sys/atomic.h',
                    msg='Checking for atomic_add_32 compiler builtin')

    conf.CHECK_CODE('''
                    uint32_t i,j;
                    j = __atomic_add_fetch(&i,1,__ATOMIC_SEQ_CST)
                    ''',
                    'HAVE___ATOMIC_ADD_FETCH',
                    headers='stdint.h',
                    msg='Checking for __atomic_add_fetch compiler builtin')

    conf.CHECK_CODE('''
                    uint32_t i,j;
                    __atomic_load(&i,&j,__ATOMIC_SEQ_CST)
                    ''',
                    'HAVE___ATOMIC_ADD_LOAD',
                    headers='stdint.h',
                    msg='Checking for __atomic_load compiler builtin')

    # Check for thread fence. */
    tf = conf.CHECK_CODE('atomic_thread_fence(memory_order_seq_cst);',
                         'HAVE_ATOMIC_THREAD_FENCE',
                         headers='stdatomic.h',
                         msg='Checking for atomic_thread_fence(memory_order_seq_cst) in stdatomic.h')
    if not tf:
        tf = conf.CHECK_CODE('__atomic_thread_fence(__ATOMIC_SEQ_CST);',
                             'HAVE___ATOMIC_THREAD_FENCE',
                             msg='Checking for __atomic_thread_fence(__ATOMIC_SEQ_CST)')
    if not tf:
        # __sync_synchronize() is available since 2005 in gcc.
        tf = conf.CHECK_CODE('__sync_synchronize();',
                             'HAVE___SYNC_SYNCHRONIZE',
                             msg='Checking for __sync_synchronize')
    if tf:
        conf.DEFINE('HAVE_ATOMIC_THREAD_FENCE_SUPPORT', 1)

    conf.CHECK_CODE('''
                    #define FALL_THROUGH __attribute__((fallthrough))

                    enum direction_e {
                        UP = 0,
                        DOWN,
                    };

                    int main(void) {
                        enum direction_e key = UP;
                        int i = 10;
                        int j = 0;

                        switch (key) {
                        case UP:
                            i = 5;
                            FALL_THROUGH;
                        case DOWN:
                            j = i * 2;
                            break;
                        default:
                            break;
                        }

                        if (j < i) {
                            return 1;
                        }

                        return 0;
                    }
                    ''',
                    'HAVE_FALLTHROUGH_ATTRIBUTE',
                    addmain=False,
                    strict=True,
                    cflags=['-Werror=missing-declarations'],
                    msg='Checking for fallthrough attribute')

    # these may be builtins, so we need the link=False strategy
    conf.CHECK_FUNCS('strdup memmem printf memset memcpy memmove strcpy strncpy bzero', link=False)

    # See https://bugzilla.samba.org/show_bug.cgi?id=1097
    #
    # Ported in from autoconf where it was added with this commit:
    # commit 804cfb20a067b4b687089dc72a8271b3abf20f31
    # Author: Simo Sorce <idra@samba.org>
    # Date:   Wed Aug 25 14:24:16 2004 +0000
    #     r2070: Let's try to overload srnlen and strndup for AIX where they are natly broken.

    host_os = sys.platform
    if host_os.rfind('aix') > -1:
        conf.DEFINE('BROKEN_STRNLEN', 1)
        conf.DEFINE('BROKEN_STRNDUP', 1)

    conf.CHECK_FUNCS('shl_load shl_unload shl_findsym')
    conf.CHECK_FUNCS('pipe strftime srandom random srand rand usleep setbuffer')
    conf.CHECK_FUNCS('lstat getpgrp utime utimes setuid seteuid setreuid setresuid setgid setegid')
    conf.CHECK_FUNCS('setregid setresgid chroot strerror vsyslog setlinebuf mktime')
    conf.CHECK_FUNCS('ftruncate chsize rename waitpid wait4')
    conf.CHECK_FUNCS('initgroups pread pwrite strndup strcasestr strsep')
    conf.CHECK_FUNCS('strtok_r mkdtemp dup2 dprintf vdprintf isatty chown lchown')
    conf.CHECK_FUNCS('link readlink symlink realpath snprintf vsnprintf')
    conf.CHECK_FUNCS('asprintf vasprintf setenv unsetenv strnlen strtoull __strtoull')
    conf.CHECK_FUNCS('strtouq strtoll __strtoll strtoq memalign posix_memalign')
    conf.CHECK_FUNCS('fmemopen')

    if conf.CONFIG_SET('HAVE_MEMALIGN'):
        conf.CHECK_DECLS('memalign', headers='malloc.h')

    # glibc up to 2.3.6 had dangerously broken posix_fallocate(). DON'T USE IT.
    if conf.CHECK_CODE('''
#define _XOPEN_SOURCE 600
#include <stdlib.h>
#if defined(__GLIBC__) && ((__GLIBC__ < 2) || (__GLIBC__ == 2 && __GLIBC_MINOR__ < 4))
#error probably broken posix_fallocate
#endif
''',
                       '_POSIX_FALLOCATE_CAPABLE_LIBC',
                       msg='Checking for posix_fallocate-capable libc'):
        conf.CHECK_FUNCS('posix_fallocate')

    conf.CHECK_FUNCS('prctl dirname basename')

    strlcpy_in_bsd = False

    # libbsd on some platforms provides strlcpy and strlcat
    if not conf.CHECK_FUNCS('strlcpy strlcat'):
        if conf.CHECK_FUNCS_IN('strlcpy strlcat', 'bsd', headers='bsd/string.h',
                               checklibc=True):
            strlcpy_in_bsd = True
    if not conf.CHECK_FUNCS('getpeereid'):
        conf.CHECK_FUNCS_IN('getpeereid', 'bsd', headers='sys/types.h bsd/unistd.h')
    if not conf.CHECK_FUNCS_IN('setproctitle', 'setproctitle', headers='setproctitle.h'):
        conf.CHECK_FUNCS_IN('setproctitle', 'bsd', headers='sys/types.h bsd/unistd.h')
    if not conf.CHECK_FUNCS('setproctitle_init'):
        conf.CHECK_FUNCS_IN('setproctitle_init', 'bsd', headers='sys/types.h bsd/unistd.h')

    if not conf.CHECK_FUNCS('closefrom'):
        conf.CHECK_FUNCS_IN('closefrom', 'bsd', headers='bsd/unistd.h')

    conf.CHECK_CODE('''
                struct ucred cred;
                socklen_t cred_len;
                int ret = getsockopt(0, SOL_SOCKET, SO_PEERCRED, &cred, &cred_len);''',
                'HAVE_PEERCRED',
                msg="Checking whether we can use SO_PEERCRED to get socket credentials",
                headers='sys/types.h sys/socket.h')

    #Some OS (ie. freebsd) return EINVAL if the conversion could not be done, it's not what we expect
    #Let's detect those cases
    if conf.CONFIG_SET('HAVE_STRTOLL'):
        conf.CHECK_CODE('''
                        long long nb = strtoll("Text", NULL, 0);
                        if (errno == EINVAL) {
                            return 0;
                        } else {
                            return 1;
                        }
                        ''',
                        msg="Checking correct behavior of strtoll",
                        headers = 'errno.h',
                        execute = True,
                        define = 'HAVE_BSD_STRTOLL',
                        )
    conf.CHECK_FUNCS('if_nameindex if_nametoindex strerror_r')
    conf.CHECK_FUNCS('syslog')
    conf.CHECK_FUNCS('gai_strerror get_current_dir_name')
    conf.CHECK_FUNCS('timegm getifaddrs freeifaddrs mmap setgroups syscall setsid')
    conf.CHECK_FUNCS('getgrent_r getgrgid_r getgrnam_r getgrouplist getpagesize')
    conf.CHECK_FUNCS('getpwent_r getpwnam_r getpwuid_r epoll_create')
    conf.CHECK_FUNCS('getprogname')
    if not conf.CHECK_FUNCS('copy_file_range'):
        conf.CHECK_CODE('''
syscall(SYS_copy_file_range,0,NULL,0,NULL,0,0);
                        ''',
                        'HAVE_SYSCALL_COPY_FILE_RANGE',
                        headers='sys/syscall.h unistd.h',
                        msg='Checking whether we have copy_file_range system call')

    conf.SET_TARGET_TYPE('attr', 'EMPTY')

    xattr_headers='sys/attributes.h attr/xattr.h sys/xattr.h'

    # default to 1, we set it to 0 if we don't find any EA implementation below:
    conf.DEFINE('HAVE_XATTR_SUPPORT', 1)
    if conf.CHECK_FUNCS_IN('getxattr', 'attr', checklibc=True, headers=xattr_headers):
        conf.DEFINE('HAVE_XATTR_XATTR', 1)
        # Darwin has extra options to xattr-family functions
        conf.CHECK_CODE('getxattr(NULL, NULL, NULL, 0, 0, 0)',
                        headers=xattr_headers, local_include=False,
                        define='XATTR_ADDITIONAL_OPTIONS',
                        msg="Checking whether xattr interface takes additional options")
    elif conf.CHECK_FUNCS_IN('attr_listf', 'attr', checklibc=True, headers=xattr_headers):
        conf.DEFINE('HAVE_XATTR_ATTR', 1)
    elif conf.CHECK_FUNCS('extattr_list_fd'):
        conf.DEFINE('HAVE_XATTR_EXTATTR', 1)
    elif conf.CHECK_FUNCS('flistea'):
        conf.DEFINE('HAVE_XATTR_EA', 1)
    elif not conf.CHECK_FUNCS('attropen'):
            conf.DEFINE('HAVE_XATTR_SUPPORT', 0)


    conf.CHECK_FUNCS_IN('dlopen dlsym dlerror dlclose', 'dl',
                        checklibc=True, headers='dlfcn.h dl.h')

    conf.CHECK_C_PROTOTYPE('dlopen', 'void *dlopen(const char* filename, unsigned int flags)',
                           define='DLOPEN_TAKES_UNSIGNED_FLAGS', headers='dlfcn.h dl.h')

    #
    # Check for clock_gettime and fdatasync
    #
    # First check libc to avoid linking libreplace against librt.
    #
    if conf.CHECK_FUNCS('fdatasync'):
        # some systems are missing the declaration
        conf.CHECK_DECLS('fdatasync')
    else:
        if conf.CHECK_FUNCS_IN('fdatasync', 'rt'):
            # some systems are missing the declaration
            conf.CHECK_DECLS('fdatasync')

    has_clock_gettime = False
    if conf.CHECK_FUNCS('clock_gettime'):
        has_clock_gettime = True

    if not has_clock_gettime:
        if conf.CHECK_FUNCS_IN('clock_gettime', 'rt', checklibc=True):
            has_clock_gettime = True

    if has_clock_gettime:
        for c in ['CLOCK_MONOTONIC', 'CLOCK_PROCESS_CPUTIME_ID', 'CLOCK_REALTIME']:
            conf.CHECK_CODE('''
                #if TIME_WITH_SYS_TIME
                # include <sys/time.h>
                # include <time.h>
                #else
                # if HAVE_SYS_TIME_H
                #  include <sys/time.h>
                # else
                #  include <time.h>
                # endif
                #endif
                clockid_t clk = %s''' % c,
                'HAVE_%s' % c,
                msg='Checking whether the clock_gettime clock ID %s is available' % c)

    conf.CHECK_TYPE('struct timespec', headers='sys/time.h time.h')

    # these headers need to be tested as a group on freebsd
    conf.CHECK_HEADERS(headers='sys/socket.h net/if.h', together=True)
    conf.CHECK_HEADERS(headers='netinet/in.h arpa/nameser.h resolv.h', together=True)
    conf.CHECK_FUNCS_IN('res_search', 'resolv', checklibc=True,
                        headers='netinet/in.h arpa/nameser.h resolv.h')


    # try to find libintl (if --without-gettext is not given)
    conf.env.intl_libs=''
    if not Options.options.disable_gettext:
        conf.CHECK_HEADERS('libintl.h')
        conf.CHECK_LIB('intl')
        conf.CHECK_DECLS('dgettext gettext bindtextdomain textdomain bind_textdomain_codeset', headers="libintl.h")
        # *textdomain functions are not strictly necessary
        conf.CHECK_FUNCS_IN('bindtextdomain textdomain bind_textdomain_codeset',
                            '', checklibc=True, headers='libintl.h')
        # gettext and dgettext must exist
        # on some systems (the ones with glibc, those are in libc)
        if conf.CHECK_FUNCS_IN('dgettext gettext', '', checklibc=True, headers='libintl.h'):
            # save for dependency definitions
            conf.env.intl_libs=''
        # others (e.g. FreeBSD) have separate libintl
        elif conf.CHECK_FUNCS_IN('dgettext gettext', 'intl', checklibc=False, headers='libintl.h'):
            # save for dependency definitions
            conf.env.intl_libs='intl'
            # recheck with libintl
            conf.CHECK_FUNCS_IN('bindtextdomain textdomain bind_textdomain_codeset',
                            'intl', checklibc=False, headers='libintl.h')
        else:
            # Some hosts need lib iconv for linking with lib intl
            # So we try with flags just in case it helps.
            oldflags = list(conf.env['EXTRA_LDFLAGS']);
            conf.env['EXTRA_LDFLAGS'].extend(["-liconv"])
            conf.CHECK_FUNCS_IN('dgettext gettext bindtextdomain textdomain bind_textdomain_codeset',
                                'intl', checklibc=False, headers='libintl.h')
            conf.env['EXTRA_LDFLAGS'] = oldflags
            if conf.env['HAVE_GETTEXT'] and conf.env['HAVE_DGETTEXT']:
                # save for dependency definitions
                conf.env.intl_libs='iconv intl'

    # did we find both prototypes and a library to link against?
    # if not, unset the detected values (see Bug #9911)
    if not (conf.env['HAVE_GETTEXT'] and conf.env['HAVE_DECL_GETTEXT']):
       conf.undefine('HAVE_GETTEXT')
       conf.undefine('HAVE_DECL_GETTEXT')
    if not (conf.env['HAVE_DGETTEXT'] and conf.env['HAVE_DECL_DGETTEXT']):
       conf.undefine('HAVE_DGETTEXT')
       conf.undefine('HAVE_DECL_DGETTEXT')

    conf.CHECK_FUNCS_IN('pthread_create', 'pthread', checklibc=True, headers='pthread.h')

    PTHREAD_CFLAGS='error'
    PTHREAD_LDFLAGS='error'

    if PTHREAD_LDFLAGS == 'error':
        # Check if pthread_attr_init() is provided by libc first!
        if conf.CHECK_FUNCS('pthread_attr_init'):
            PTHREAD_CFLAGS='-D_REENTRANT'
            PTHREAD_LDFLAGS=''
    if PTHREAD_LDFLAGS == 'error':
        if conf.CHECK_FUNCS_IN('pthread_attr_init', 'pthread'):
            PTHREAD_CFLAGS='-D_REENTRANT -D_POSIX_PTHREAD_SEMANTICS'
            PTHREAD_LDFLAGS='-lpthread'
    if PTHREAD_LDFLAGS == 'error':
        if conf.CHECK_FUNCS_IN('pthread_attr_init', 'pthreads'):
            PTHREAD_CFLAGS='-D_THREAD_SAFE'
            PTHREAD_LDFLAGS='-lpthreads'
    if PTHREAD_LDFLAGS == 'error':
        if conf.CHECK_FUNCS_IN('pthread_attr_init', 'c_r'):
            PTHREAD_CFLAGS='-D_THREAD_SAFE -pthread'
            PTHREAD_LDFLAGS='-pthread'

    # especially for HP-UX, where the CHECK_FUNC macro fails to test for
    # pthread_attr_init. On pthread_mutex_lock it works there...
    if PTHREAD_LDFLAGS == 'error':
        if conf.CHECK_FUNCS_IN('pthread_mutex_lock', 'pthread'):
            PTHREAD_CFLAGS='-D_REENTRANT'
            PTHREAD_LDFLAGS='-lpthread'

    if PTHREAD_CFLAGS != 'error' and PTHREAD_LDFLAGS != 'error':
        if conf.CONFIG_SET('replace_add_global_pthread'):
            conf.ADD_CFLAGS(PTHREAD_CFLAGS)
            conf.ADD_LDFLAGS(PTHREAD_LDFLAGS)
        conf.CHECK_HEADERS('pthread.h')
        conf.DEFINE('HAVE_PTHREAD', '1')

    if conf.CONFIG_SET('HAVE_PTHREAD'):

        conf.CHECK_FUNCS_IN('pthread_mutexattr_setrobust', 'pthread',
                            checklibc=True, headers='pthread.h')
        if not conf.CONFIG_SET('HAVE_PTHREAD_MUTEXATTR_SETROBUST'):
            conf.CHECK_FUNCS_IN('pthread_mutexattr_setrobust_np', 'pthread',
                                checklibc=True, headers='pthread.h')

        conf.CHECK_DECLS('PTHREAD_MUTEX_ROBUST', headers='pthread.h')
        if not conf.CONFIG_SET('HAVE_DECL_PTHREAD_MUTEX_ROBUST'):
            conf.CHECK_DECLS('PTHREAD_MUTEX_ROBUST_NP', headers='pthread.h')

        conf.CHECK_FUNCS_IN('pthread_mutex_consistent', 'pthread',
                            checklibc=True, headers='pthread.h')
        if not conf.CONFIG_SET('HAVE_PTHREAD_MUTEX_CONSISTENT'):
            conf.CHECK_FUNCS_IN('pthread_mutex_consistent_np', 'pthread',
                                checklibc=True, headers='pthread.h')

        if ((conf.CONFIG_SET('HAVE_PTHREAD_MUTEXATTR_SETROBUST') or
             conf.CONFIG_SET('HAVE_PTHREAD_MUTEXATTR_SETROBUST_NP')) and
            (conf.CONFIG_SET('HAVE_DECL_PTHREAD_MUTEX_ROBUST') or
             conf.CONFIG_SET('HAVE_DECL_PTHREAD_MUTEX_ROBUST_NP')) and
            (conf.CONFIG_SET('HAVE_PTHREAD_MUTEX_CONSISTENT') or
             conf.CONFIG_SET('HAVE_PTHREAD_MUTEX_CONSISTENT_NP'))):
            conf.DEFINE('HAVE_ROBUST_MUTEXES', 1)

    # __thread is available in Solaris Studio, IBM XL,
    # gcc, Clang and Intel C Compiler
    conf.CHECK_CODE('''
        __thread int tls;

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

    if conf.CONFIG_SET('HAVE_PTHREAD') and not conf.CONFIG_SET('HAVE___THREAD'):
        conf.fatal('Missing required TLS support in pthread library')

    conf.CHECK_FUNCS_IN('crypt', 'crypt', checklibc=True)
    conf.CHECK_FUNCS_IN('crypt_r', 'crypt', checklibc=True)
    conf.CHECK_FUNCS_IN('crypt_rn', 'crypt', checklibc=True)

    conf.CHECK_VARIABLE('rl_event_hook', define='HAVE_DECL_RL_EVENT_HOOK', always=True,
                        headers='readline.h readline/readline.h readline/history.h')
    conf.CHECK_VARIABLE('program_invocation_short_name', headers='errno.h')

    conf.CHECK_DECLS('snprintf vsnprintf asprintf vasprintf')

    conf.CHECK_DECLS('errno', headers='errno.h', reverse=True)
    conf.CHECK_DECLS('EWOULDBLOCK', headers='errno.h')
    conf.CHECK_DECLS('environ', reverse=True, headers='unistd.h')
    conf.CHECK_DECLS('getgrent_r getpwent_r', reverse=True, headers='pwd.h grp.h')
    conf.CHECK_DECLS('pread pwrite setenv setresgid setresuid', reverse=True)

    if conf.CONFIG_SET('HAVE_EPOLL_CREATE') and conf.CONFIG_SET('HAVE_SYS_EPOLL_H'):
        conf.DEFINE('HAVE_EPOLL', 1)

    if conf.CHECK_FUNCS('eventfd', headers='sys/eventfd.h'):
        conf.DEFINE('HAVE_EVENTFD', 1)

    conf.CHECK_HEADERS('poll.h')
    conf.CHECK_FUNCS('poll')

    conf.CHECK_FUNCS('strptime')
    conf.CHECK_DECLS('strptime', headers='time.h')
    conf.CHECK_CODE('''#define LIBREPLACE_CONFIGURE_TEST_STRPTIME
                       #include "tests/strptime.c"''',
                       define='HAVE_WORKING_STRPTIME',
                       execute=True,
                       addmain=False,
                       msg='Checking for working strptime')

    conf.CHECK_C_PROTOTYPE('gettimeofday',
                           'int gettimeofday(struct timeval *tv, struct timezone *tz)',
                           define='HAVE_GETTIMEOFDAY_TZ', headers='sys/time.h')

    conf.CHECK_C_PROTOTYPE('gettimeofday',
                           'int gettimeofday(struct timeval *tv, void *tz)',
                           define='HAVE_GETTIMEOFDAY_TZ_VOID',
                           headers='sys/time.h')

    conf.CHECK_CODE('#include "tests/snprintf.c"',
                    define="HAVE_C99_VSNPRINTF",
                    execute=True,
                    addmain=False,
                    msg="Checking for C99 vsnprintf")

    conf.CHECK_CODE('#include "tests/shared_mmap.c"',
                    addmain=False, add_headers=False, execute=True,
                    define='HAVE_SHARED_MMAP',
                    msg="Checking for HAVE_SHARED_MMAP")

    conf.CHECK_CODE('#include "tests/shared_mremap.c"',
                    addmain=False, add_headers=False, execute=True,
                    define='HAVE_MREMAP',
                    msg="Checking for HAVE_MREMAP")

    # OpenBSD (and I've heard HPUX) doesn't sync between mmap and write.
    # FIXME: Anything other than a 0 or 1 exit code should abort configure!
    conf.CHECK_CODE('#include "tests/incoherent_mmap.c"',
                    addmain=False, add_headers=False, execute=True,
                    define='HAVE_INCOHERENT_MMAP',
                    msg="Checking for HAVE_INCOHERENT_MMAP")

    conf.SAMBA_BUILD_ENV()

    conf.CHECK_CODE('''
                    typedef struct {unsigned x;} FOOBAR;
                    #define X_FOOBAR(x) ((FOOBAR) { x })
                    #define FOO_ONE X_FOOBAR(1)
                    FOOBAR f = FOO_ONE;
                    static const struct {
                        FOOBAR y;
                    } f2[] = {
                        {FOO_ONE}
                    };
                    static const FOOBAR f3[] = {FOO_ONE};
                    ''',
                    define='HAVE_IMMEDIATE_STRUCTURES')

    conf.CHECK_CODE('mkdir("foo",0777)', define='HAVE_MKDIR_MODE', headers='sys/stat.h')

    # we need the st_rdev test under two names
    conf.CHECK_STRUCTURE_MEMBER('struct stat', 'st_rdev',
                                define='HAVE_STRUCT_STAT_ST_RDEV',
                                headers='sys/stat.h')
    conf.CHECK_STRUCTURE_MEMBER('struct stat', 'st_rdev', define='HAVE_ST_RDEV',
                                headers='sys/stat.h')
    conf.CHECK_STRUCTURE_MEMBER('struct sockaddr_storage', 'ss_family',
                                headers='sys/socket.h netinet/in.h')
    conf.CHECK_STRUCTURE_MEMBER('struct sockaddr_storage', '__ss_family',
                                headers='sys/socket.h netinet/in.h')


    if conf.CHECK_STRUCTURE_MEMBER('struct sockaddr', 'sa_len',
                                   headers='sys/socket.h netinet/in.h',
                                   define='HAVE_SOCKADDR_SA_LEN'):
        # the old build system produced both defines
        conf.DEFINE('HAVE_STRUCT_SOCKADDR_SA_LEN', 1)

    conf.CHECK_STRUCTURE_MEMBER('struct sockaddr_in', 'sin_len',
                                headers='sys/socket.h netinet/in.h',
                                define='HAVE_SOCK_SIN_LEN')

    conf.CHECK_STRUCTURE_MEMBER('struct sockaddr_in6', 'sin6_len',
                                headers='sys/socket.h netinet/in.h',
                                define='HAVE_SOCK_SIN6_LEN')

    conf.CHECK_CODE('struct sockaddr_un sunaddr; sunaddr.sun_family = AF_UNIX;',
                    define='HAVE_UNIXSOCKET', headers='sys/socket.h sys/un.h')


    conf.CHECK_CODE('''
                    struct stat st;
                    char tpl[20]="/tmp/test.XXXXXX";
                    char tpl2[20]="/tmp/test.XXXXXX";
                    int fd = mkstemp(tpl);
                    int fd2 = mkstemp(tpl2);
                    if (fd == -1) {
                          if (fd2 != -1) {
                                  unlink(tpl2);
                          }
                          exit(1);
                    }
                    if (fd2 == -1) exit(1);
                    unlink(tpl);
                    unlink(tpl2);
                    if (fstat(fd, &st) != 0) exit(1);
                    if ((st.st_mode & 0777) != 0600) exit(1);
                    if (strcmp(tpl, "/tmp/test.XXXXXX") == 0) {
                          exit(1);
                    }
                    if (strcmp(tpl, tpl2) == 0) {
                          exit(1);
                    }
                    exit(0);
                    ''',
                    define='HAVE_SECURE_MKSTEMP',
                    execute=True,
                    mandatory=True) # lets see if we get a mandatory failure for this one

    # look for a method of finding the list of network interfaces
    for method in ['HAVE_IFACE_GETIFADDRS', 'HAVE_IFACE_AIX', 'HAVE_IFACE_IFCONF', 'HAVE_IFACE_IFREQ']:
        bsd_for_strlcpy = ''
        if strlcpy_in_bsd:
            bsd_for_strlcpy = ' bsd'
        if conf.CHECK_CODE('''
                           #define %s 1
                           #define NO_CONFIG_H 1
                           #define AUTOCONF_TEST 1
                           #include "replace.c"
                           #include "inet_ntop.c"
                           #include "snprintf.c"
                           #include "getifaddrs.c"
                           #define getifaddrs_test main
                           #include "tests/getifaddrs.c"
                           ''' % method,
                           method,
                           lib='nsl socket' + bsd_for_strlcpy,
                           addmain=False,
                           execute=True):
            break

    conf.RECURSE('system')
    conf.SAMBA_CONFIG_H()
    if conf.CHECK_FUNCS('strerror_r'):
        # Check if strerror_r is XSI-Compatable, the default GNU implementation
        # is not
        conf.CHECK_CODE('int strerror_r(int errnum, char *buf, size_t buflen);',
                        'STRERROR_R_XSI_NOT_GNU',
                        headers='string.h', addmain=False, link=False,
                        msg="Checking for XSI (rather than GNU) prototype for strerror_r")


REPLACEMENT_FUNCTIONS = {
    'replace.c': ['ftruncate', 'strlcpy', 'strlcat', 'mktime', 'initgroups',
                  'memmove', 'strdup', 'setlinebuf', 'vsyslog', 'strnlen',
                  'strndup', 'waitpid', 'seteuid', 'setegid', 'chroot',
                  'mkstemp', 'mkdtemp', 'pread', 'pwrite', 'strcasestr',
                  'strsep', 'strtok_r', 'strtoll', 'strtoull', 'setenv', 'unsetenv',
                  'utime', 'utimes', 'dup2', 'chown', 'link', 'readlink',
                  'symlink', 'lchown', 'realpath', 'memmem', 'vdprintf',
                  'dprintf', 'get_current_dir_name', 'copy_file_range',
                  'strerror_r', 'clock_gettime', 'memset_s'],
    'timegm.c': ['timegm'],
    # Note: C99_VSNPRINTF is not a function, but a special condition
    # for replacement
    'snprintf.c': ['C99_VSNPRINTF', 'snprintf', 'vsnprintf', 'asprintf', 'vasprintf'],
    # Note: WORKING_STRPTIME is not a function, but a special condition
    # for replacement
    'strptime.c': ['WORKING_STRPTIME', 'strptime'],
    }


def build(bld):
    bld.RECURSE('buildtools/wafsamba')

    REPLACE_HOSTCC_SOURCE = ''

    for filename in REPLACEMENT_FUNCTIONS.keys():
        for function in REPLACEMENT_FUNCTIONS[filename]:
            if not bld.CONFIG_SET('HAVE_%s' % function.upper()):
                REPLACE_HOSTCC_SOURCE += ' %s' % filename
                break

    extra_libs = ''
    if bld.CONFIG_SET('HAVE_LIBBSD'): extra_libs += ' bsd'
    if bld.CONFIG_SET('HAVE_LIBRT'): extra_libs += ' rt'
    if bld.CONFIG_SET('REPLACE_REQUIRES_LIBSOCKET_LIBNSL'): extra_libs += ' socket nsl'

    if not bld.CONFIG_SET('HAVE_CLOSEFROM'):
        REPLACE_HOSTCC_SOURCE += ' closefrom.c'

    bld.SAMBA_SUBSYSTEM('LIBREPLACE_HOSTCC',
        REPLACE_HOSTCC_SOURCE,
        use_hostcc=True,
        use_global_deps=False,
        group='hostcc_base_build_main',
        deps = extra_libs
    )

    REPLACE_SOURCE = REPLACE_HOSTCC_SOURCE

    if not bld.CONFIG_SET('HAVE_DLOPEN'):        REPLACE_SOURCE += ' dlfcn.c'
    if not bld.CONFIG_SET('HAVE_POLL'):          REPLACE_SOURCE += ' poll.c'

    if not bld.CONFIG_SET('HAVE_SOCKETPAIR'):    REPLACE_SOURCE += ' socketpair.c'
    if not bld.CONFIG_SET('HAVE_CONNECT'):       REPLACE_SOURCE += ' socket.c'
    if not bld.CONFIG_SET('HAVE_GETIFADDRS'):    REPLACE_SOURCE += ' getifaddrs.c'
    if not bld.CONFIG_SET('HAVE_GETADDRINFO'):   REPLACE_SOURCE += ' getaddrinfo.c'
    if not bld.CONFIG_SET('HAVE_INET_NTOA'):     REPLACE_SOURCE += ' inet_ntoa.c'
    if not bld.CONFIG_SET('HAVE_INET_ATON'):     REPLACE_SOURCE += ' inet_aton.c'
    if not bld.CONFIG_SET('HAVE_INET_NTOP'):     REPLACE_SOURCE += ' inet_ntop.c'
    if not bld.CONFIG_SET('HAVE_INET_PTON'):     REPLACE_SOURCE += ' inet_pton.c'
    if not bld.CONFIG_SET('HAVE_GETXATTR') or bld.CONFIG_SET('XATTR_ADDITIONAL_OPTIONS'):
                                                 REPLACE_SOURCE += ' xattr.c'

    if not bld.CONFIG_SET('HAVE_CLOSEFROM'):
        REPLACE_SOURCE += ' closefrom.c'

    bld.SAMBA_LIBRARY('replace',
                      source=REPLACE_SOURCE,
                      group='base_libraries',
                      # FIXME: Ideally symbols should be hidden here so they
                      # don't appear in the global namespace when Samba
                      # libraries are loaded, but this doesn't appear to work
                      # at the moment:
                      # hide_symbols=bld.BUILTIN_LIBRARY('replace'),
                      private_library=True,
                      provide_builtin_linking=True,
                      deps='dl attr' + extra_libs)

    replace_test_cflags = ''
    if bld.CONFIG_SET('HAVE_WNO_FORMAT_TRUNCATION'):
        replace_test_cflags += " -Wno-format-truncation"
    bld.SAMBA_SUBSYSTEM('replace-test',
                        source='''tests/testsuite.c tests/strptime.c
                        tests/os2_delete.c tests/getifaddrs.c''',
                        deps='replace',
                        cflags=replace_test_cflags)

    bld.SAMBA_BINARY('replace_testsuite',
                     source='tests/main.c',
                     deps='replace replace-test',
                     install=False)

    # build replacements for stdint.h and stdbool.h if needed
    bld.SAMBA_GENERATOR('replace_stdint_h',
                        rule='cp ${SRC} ${TGT}',
                        source='hdr_replace.h',
                        target='stdint.h',
                        enabled = not bld.CONFIG_SET('HAVE_STDINT_H'))
    bld.SAMBA_GENERATOR('replace_stdbool_h',
                        rule='cp ${SRC} ${TGT}',
                        source='hdr_replace.h',
                        target='stdbool.h',
                        enabled = not bld.CONFIG_SET('HAVE_STDBOOL_H'))

    bld.SAMBA_SUBSYSTEM('samba_intl', source='', use_global_deps=False,deps=bld.env.intl_libs)

def testonly(ctx):
    '''run talloc testsuite'''
    import samba_utils

    samba_utils.ADD_LD_LIBRARY_PATH('bin/shared')
    samba_utils.ADD_LD_LIBRARY_PATH('bin/shared/private')

    cmd = os.path.join(Context.g_module.out, 'replace_testsuite')
    ret = samba_utils.RUN_COMMAND(cmd)
    print("testsuite returned %d" % ret)
    sys.exit(ret)

# WAF doesn't build the unit tests for this, maybe because they don't link with talloc?
# This forces it
def test(ctx):
    Options.commands.append('build')
    Options.commands.append('testonly')

def dist():
    '''makes a tarball for distribution'''
    samba_dist.dist()