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annotate m4/getdomainname.m4 @ 14434:7624b26aea3d

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sys_socket, netdb: Document problem with socklen_t. * doc/posix-headers/sys_socket.texi: Mention lack of socklen_t on some platforms. * doc/posix-headers/netdb.texi: Likewise.
author Bruno Haible <bruno@clisp.org>
date Sat, 19 Mar 2011 13:39:12 +0100
parents 97fc9a21a8fb
children f16721915551
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1 # getdomainname.m4 serial 5
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Jim Meyering <meyering@redhat.com>
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2 dnl Copyright (C) 2002-2003, 2008-2011 Free Software Foundation, Inc.
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Paul Eggert <eggert@cs.ucla.edu>
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3 dnl This file is free software; the Free Software Foundation
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4 dnl gives unlimited permission to copy and/or distribute it,
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5 dnl with or without modifications, as long as this notice is preserved.
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6
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7 AC_DEFUN([gl_FUNC_GETDOMAINNAME],
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8 [
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9 AC_REQUIRE([gl_UNISTD_H_DEFAULTS])
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10 AC_REQUIRE([gl_HEADER_SYS_SOCKET])dnl for HAVE_SYS_SOCKET_H
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11 AC_REQUIRE([gl_HEADER_NETDB])dnl for HAVE_NETDB_H
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12
65c9436dc0d3 Move the getdomainname() declaration to <unistd.h>.
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13 dnl Persuade glibc <unistd.h> to declare getdomainname().
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14 AC_REQUIRE([AC_USE_SYSTEM_EXTENSIONS])
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15
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16 dnl Where is getdomainname() defined?
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17 dnl - On Solaris, it is in libnsl. But this function is not declared and
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18 dnl is discouraged, see
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19 dnl <http://www.sun.com/software/solaris/programs/abi/appcert_faq.xml#q18>.
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20 dnl We need to avoid a collision with this function.
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21 dnl - Otherwise is is in libc.
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22 AC_CHECK_FUNCS([getdomainname], , [
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23 AC_CACHE_CHECK([for getdomainname in -lnsl],
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24 [gl_cv_func_getdomainname_in_libnsl],
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25 [gl_cv_func_getdomainname_in_libnsl=no
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26 gl_save_LIBS="$LIBS"
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27 LIBS="$LIBS -lnsl"
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28 AC_LINK_IFELSE(
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29 [AC_LANG_PROGRAM(
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30 [[#include <stddef.h>
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31 extern int getdomainname (char *, size_t);
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32 ]],
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33 [[getdomainname(NULL, 0);]])],
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34 [gl_cv_func_getdomainname_in_libnsl=yes])
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35 LIBS="$gl_save_LIBS"
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36 ])
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37 ])
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38
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39 dnl What about the declaration?
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40 dnl - It's int getdomainname(char *, size_t) on glibc, NetBSD, OpenBSD.
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41 dnl - It's int getdomainname(char *, int) on MacOS X, FreeBSD, AIX, IRIX,
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42 dnl OSF/1.
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43 AC_CHECK_DECLS([getdomainname], , ,
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44 [#include <sys/types.h>
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45 #ifdef HAVE_SYS_SOCKET_H
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46 #include <sys/socket.h>
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47 #endif
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48 #ifdef HAVE_NETDB_H
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49 #include <netdb.h>
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50 #endif
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51 #include <unistd.h>
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52 ])
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53 AC_CACHE_CHECK([for getdomainname's second argument type],
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54 [gl_cv_decl_getdomainname_argtype2],
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55 [if test $ac_cv_have_decl_getdomainname; then
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56 AC_COMPILE_IFELSE(
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57 [AC_LANG_PROGRAM(
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58 [[#include <sys/types.h>
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59 #ifdef HAVE_SYS_SOCKET_H
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60 #include <sys/socket.h>
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61 #endif
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62 #ifdef HAVE_NETDB_H
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63 #include <netdb.h>
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64 #endif
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65 #include <unistd.h>
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66 extern int getdomainname (char *, int);]],
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67 [[]])],
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68 [gl_cv_decl_getdomainname_argtype2='int'],
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69 [gl_cv_decl_getdomainname_argtype2='size_t'])
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70 else
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71 gl_cv_decl_getdomainname_argtype2='int'
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72 fi
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73 ])
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74
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75 if test $ac_cv_have_decl_getdomainname = no; then
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76 HAVE_DECL_GETDOMAINNAME=0
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77 fi
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78
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79 if { test $ac_cv_func_getdomainname = yes \
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80 && test $gl_cv_decl_getdomainname_argtype2 != size_t; \
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81 } \
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82 || test "$gl_cv_func_getdomainname_in_libnsl" = yes; then
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83 REPLACE_GETDOMAINNAME=1
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84 fi
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85
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86 if test $HAVE_DECL_GETDOMAINNAME = 0 || test $REPLACE_GETDOMAINNAME = 1; then
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87 AC_LIBOBJ([getdomainname])
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88 gl_PREREQ_GETDOMAINNAME
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89 fi
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90 ])
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91
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92 # Prerequisites of lib/getdomainname.c.
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93 AC_DEFUN([gl_PREREQ_GETDOMAINNAME], [
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94 if test $ac_cv_func_getdomainname = yes; then
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95 AC_DEFINE([HAVE_GETDOMAINNAME], [1],
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96 [Define if the getdomainname() function is present and can be used.])
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97 fi
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98 AC_CHECK_HEADERS([sys/systeminfo.h])
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99 AC_CHECK_FUNCS([sysinfo])
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100 ])