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# getdomainname.m4 serial 13
dnl Copyright (C) 2002-2003, 2008-2023 Free Software Foundation, Inc.
dnl This file is free software; the Free Software Foundation
dnl gives unlimited permission to copy and/or distribute it,
dnl with or without modifications, as long as this notice is preserved.
AC_DEFUN([gl_FUNC_GETDOMAINNAME],
[
AC_REQUIRE([gl_UNISTD_H_DEFAULTS])
AC_REQUIRE([gl_SYS_SOCKET_H])dnl for HAVE_SYS_SOCKET_H
AC_REQUIRE([gl_NETDB_H])dnl for HAVE_NETDB_H
dnl Persuade glibc <unistd.h> to declare getdomainname().
AC_REQUIRE([AC_USE_SYSTEM_EXTENSIONS])
dnl Where is getdomainname() defined?
dnl - On Solaris, it is in libnsl. But this function is not declared and
dnl is discouraged, see
dnl <https://web.archive.org/web/20100121182558/http://www.sun.com/software/solaris/programs/abi/appcert_faq.xml#q18>.
dnl We need to avoid a collision with this function.
dnl - Otherwise it is in libc.
gl_CHECK_FUNCS_ANDROID([getdomainname], [[#include <unistd.h>]])
if test $ac_cv_func_getdomainname = no; then
AC_CACHE_CHECK([for getdomainname in -lnsl],
[gl_cv_func_getdomainname_in_libnsl],
[gl_cv_func_getdomainname_in_libnsl=no
gl_save_LIBS="$LIBS"
LIBS="$LIBS -lnsl"
AC_LINK_IFELSE(
[AC_LANG_PROGRAM(
[[#include <stddef.h>
extern
#ifdef __cplusplus
"C"
#endif
int getdomainname (char *, size_t);
]],
[[getdomainname(NULL, 0);]])],
[gl_cv_func_getdomainname_in_libnsl=yes])
LIBS="$gl_save_LIBS"
])
fi
dnl What about the declaration?
dnl - It's int getdomainname(char *, size_t) on glibc, NetBSD, OpenBSD.
dnl - It's int getdomainname(char *, int) on Mac OS X, FreeBSD, AIX, IRIX,
dnl OSF/1.
AC_CHECK_DECLS([getdomainname], , ,
[[#include <sys/types.h>
#ifdef HAVE_SYS_SOCKET_H
#include <sys/socket.h>
#endif
#ifdef HAVE_NETDB_H
#include <netdb.h>
#endif
#include <unistd.h>
]])
AC_CACHE_CHECK([for getdomainname's second argument type],
[gl_cv_decl_getdomainname_argtype2],
[if test $ac_cv_have_decl_getdomainname; then
AC_COMPILE_IFELSE(
[AC_LANG_PROGRAM(
[[#include <sys/types.h>
#ifdef HAVE_SYS_SOCKET_H
#include <sys/socket.h>
#endif
#ifdef HAVE_NETDB_H
#include <netdb.h>
#endif
#include <unistd.h>
extern
#ifdef __cplusplus
"C"
#endif
int getdomainname (char *, int);
]],
[[]])],
[gl_cv_decl_getdomainname_argtype2='int'],
[gl_cv_decl_getdomainname_argtype2='size_t'])
else
gl_cv_decl_getdomainname_argtype2='int'
fi
])
if test $ac_cv_have_decl_getdomainname = no; then
HAVE_DECL_GETDOMAINNAME=0
fi
if { test $ac_cv_func_getdomainname = yes \
&& test $gl_cv_decl_getdomainname_argtype2 != size_t; \
} \
|| case "$gl_cv_onwards_func_getdomainname" in \
future*) true ;; \
*) false ;; \
esac \
|| test "$gl_cv_func_getdomainname_in_libnsl" = yes; then
REPLACE_GETDOMAINNAME=1
fi
])
# Prerequisites of lib/getdomainname.c.
AC_DEFUN([gl_PREREQ_GETDOMAINNAME], [
if test $ac_cv_func_getdomainname = yes; then
AC_DEFINE([HAVE_GETDOMAINNAME], [1],
[Define if the getdomainname() function is present and can be used.])
fi
AC_CHECK_HEADERS([sys/systeminfo.h])
AC_CHECK_FUNCS([sysinfo])
])
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