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Commit	Line	Data
	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