projects / wxWidgets.git / blame
| Commit | Line | Data |
|---|---|---|
| bebf40d5 SN |
1 | dnl @synopsis AX_FUNC_WHICH_GETHOSTBYNAME_R |
| 2 | dnl | |
| 3 | dnl Determines which historical variant of the gethostbyname_r() call | |
| 4 | dnl (taking three, five, or six arguments) is available on the system | |
| 5 | dnl and defines one of the following macros accordingly: | |
| 6 | dnl | |
| 7 | dnl HAVE_FUNC_GETHOSTBYNAME_R_6 | |
| 8 | dnl HAVE_FUNC_GETHOSTBYNAME_R_5 | |
| 9 | dnl HAVE_FUNC_GETHOSTBYNAME_R_3 | |
| 10 | dnl | |
| 11 | dnl If used in conjunction with gethostname.c, the API demonstrated in | |
| 12 | dnl test.c can be used regardless of which gethostbyname_r() is | |
| 13 | dnl available. These example files can be found at | |
| 14 | dnl http://www.csn.ul.ie/~caolan/publink/gethostbyname_r | |
| 15 | dnl | |
| 16 | dnl based on David Arnold's autoconf suggestion in the threads faq | |
| 17 | dnl | |
| 18 | dnl Originally named "AC_caolan_FUNC_WHICH_GETHOSTBYNAME_R". Rewritten | |
| 19 | dnl for Autoconf 2.5x by Daniel Richard G. | |
| 20 | dnl | |
| 21 | dnl @category InstalledPackages | |
| 22 | dnl @author Caolan McNamara <caolan@skynet.ie> | |
| 23 | dnl @author Daniel Richard G. <skunk@iskunk.org> | |
| 24 | dnl @version 2005-01-21 | |
| 25 | dnl @license GPLWithACException | |
| 26 | ||
| 27 | AC_DEFUN([AX_FUNC_WHICH_GETHOSTBYNAME_R], [ | |
| 28 | ||
| 29 | AC_LANG_PUSH(C) | |
| 30 | AC_MSG_CHECKING([how many arguments gethostbyname_r() takes]) | |
| 31 | ||
| 32 | AC_CACHE_VAL(ac_cv_func_which_gethostbyname_r, [ | |
| 33 | ||
| 34 | ################################################################ | |
| 35 | ||
| 36 | ac_cv_func_which_gethostbyname_r=unknown | |
| 37 | ||
| 38 | # | |
| 39 | # ONE ARGUMENT (sanity check) | |
| 40 | # | |
| 41 | ||
| 42 | # This should fail, as there is no variant of gethostbyname_r() that takes | |
| 43 | # a single argument. If it actually compiles, then we can assume that | |
| 44 | # netdb.h is not declaring the function, and the compiler is thereby | |
| 45 | # assuming an implicit prototype. In which case, we're out of luck. | |
| 46 | # | |
| 47 | AC_COMPILE_IFELSE( | |
| 48 | AC_LANG_PROGRAM( | |
| 49 | [[#include <netdb.h>]], | |
| 50 | [[ | |
| 51 | char *name = "www.gnu.org"; | |
| 52 | (void)gethostbyname_r(name) /* ; */ | |
| 53 | ]]), | |
| 54 | ac_cv_func_which_gethostbyname_r=no) | |
| 55 | ||
| 56 | # | |
| 57 | # SIX ARGUMENTS | |
| 58 | # (e.g. Linux) | |
| 59 | # | |
| 60 | ||
| 61 | if test "$ac_cv_func_which_gethostbyname_r" = "unknown"; then | |
| 62 | ||
| 63 | AC_COMPILE_IFELSE( | |
| 64 | AC_LANG_PROGRAM( | |
| 65 | [[#include <netdb.h>]], | |
| 66 | [[ | |
| 67 | char *name = "www.gnu.org"; | |
| 68 | struct hostent ret, *retp; | |
| 69 | char buf@<:@1024@:>@; | |
| 70 | int buflen = 1024; | |
| 71 | int my_h_errno; | |
| 72 | (void)gethostbyname_r(name, &ret, buf, buflen, &retp, &my_h_errno) /* ; */ | |
| 73 | ]]), | |
| 74 | ac_cv_func_which_gethostbyname_r=six) | |
| 75 | ||
| 76 | fi | |
| 77 | ||
| 78 | # | |
| 79 | # FIVE ARGUMENTS | |
| 80 | # (e.g. Solaris) | |
| 81 | # | |
| 82 | ||
| 83 | if test "$ac_cv_func_which_gethostbyname_r" = "unknown"; then | |
| 84 | ||
| 85 | AC_COMPILE_IFELSE( | |
| 86 | AC_LANG_PROGRAM( | |
| 87 | [[#include <netdb.h>]], | |
| 88 | [[ | |
| 89 | char *name = "www.gnu.org"; | |
| 90 | struct hostent ret; | |
| 91 | char buf@<:@1024@:>@; | |
| 92 | int buflen = 1024; | |
| 93 | int my_h_errno; | |
| 94 | (void)gethostbyname_r(name, &ret, buf, buflen, &my_h_errno) /* ; */ | |
| 95 | ]]), | |
| 96 | ac_cv_func_which_gethostbyname_r=five) | |
| 97 | ||
| 98 | fi | |
| 99 | ||
| 100 | # | |
| 101 | # THREE ARGUMENTS | |
| 102 | # (e.g. AIX, HP-UX, Tru64) | |
| 103 | # | |
| 104 | ||
| 105 | if test "$ac_cv_func_which_gethostbyname_r" = "unknown"; then | |
| 106 | ||
| 107 | AC_COMPILE_IFELSE( | |
| 108 | AC_LANG_PROGRAM( | |
| 109 | [[#include <netdb.h>]], | |
| 110 | [[ | |
| 111 | char *name = "www.gnu.org"; | |
| 112 | struct hostent ret; | |
| 113 | struct hostent_data data; | |
| 114 | (void)gethostbyname_r(name, &ret, &data) /* ; */ | |
| 115 | ]]), | |
| 116 | ac_cv_func_which_gethostbyname_r=three) | |
| 117 | ||
| 118 | fi | |
| 119 | ||
| 120 | ################################################################ | |
| 121 | ||
| 122 | ]) dnl end AC_CACHE_VAL | |
| 123 | ||
| 124 | case "$ac_cv_func_which_gethostbyname_r" in | |
| 125 | three) | |
| 126 | AC_MSG_RESULT([three]) | |
| 127 | AC_DEFINE(HAVE_FUNC_GETHOSTBYNAME_R_3) | |
| 128 | ;; | |
| 129 | ||
| 130 | five) | |
| 131 | AC_MSG_RESULT([five]) | |
| 132 | AC_DEFINE(HAVE_FUNC_GETHOSTBYNAME_R_5) | |
| 133 | ;; | |
| 134 | ||
| 135 | six) | |
| 136 | AC_MSG_RESULT([six]) | |
| 137 | AC_DEFINE(HAVE_FUNC_GETHOSTBYNAME_R_6) | |
| 138 | ;; | |
| 139 | ||
| 140 | no) | |
| 141 | AC_MSG_RESULT([cannot find function declaration in netdb.h]) | |
| 142 | ;; | |
| 143 | ||
| 144 | unknown) | |
| 145 | AC_MSG_RESULT([can't tell]) | |
| 146 | ;; | |
| 147 | ||
| 148 | *) | |
| 149 | AC_MSG_ERROR([internal error]) | |
| 150 | ;; | |
| 151 | esac | |
| 152 | ||
| 153 | AC_LANG_POP(C) | |
| 154 | ||
| 155 | ]) dnl end AC_DEFUN |