aclocal.m4

用来监视网络通信数据的源代码和应用程序,方便网络程序底层开发.

dnl
AC_DEFUN(AC_LBL_SOCKADDR_SA_LEN,
    [AC_MSG_CHECKING(if sockaddr struct has sa_len member)
    AC_CACHE_VAL(ac_cv_lbl_sockaddr_has_sa_len,
	AC_TRY_COMPILE([
#	include <sys/types.h>
#	include <sys/socket.h>],
	[u_int i = sizeof(((struct sockaddr *)0)->sa_len)],
	ac_cv_lbl_sockaddr_has_sa_len=yes,
	ac_cv_lbl_sockaddr_has_sa_len=no))
    AC_MSG_RESULT($ac_cv_lbl_sockaddr_has_sa_len)
    if test $ac_cv_lbl_sockaddr_has_sa_len = yes ; then
	    AC_DEFINE(HAVE_SOCKADDR_SA_LEN,1,[if struct sockaddr has sa_len])
    fi])

dnl
dnl Checks to see if there's a sockaddr_storage structure
dnl
dnl usage:
dnl
dnl	AC_LBL_SOCKADDR_STORAGE
dnl
dnl results:
dnl
dnl	HAVE_SOCKADDR_STORAGE (defined)
dnl
AC_DEFUN(AC_LBL_SOCKADDR_STORAGE,
    [AC_MSG_CHECKING(if sockaddr_storage struct exists)
    AC_CACHE_VAL(ac_cv_lbl_has_sockaddr_storage,
	AC_TRY_COMPILE([
#	include <sys/types.h>
#	include <sys/socket.h>],
	[u_int i = sizeof (struct sockaddr_storage)],
	ac_cv_lbl_has_sockaddr_storage=yes,
	ac_cv_lbl_has_sockaddr_storage=no))
    AC_MSG_RESULT($ac_cv_lbl_has_sockaddr_storage)
    if test $ac_cv_lbl_has_sockaddr_storage = yes ; then
	    AC_DEFINE(HAVE_SOCKADDR_STORAGE,1,[if struct sockaddr_storage exists])
    fi])

dnl
dnl Checks to see if the dl_hp_ppa_info_t struct has the HP-UX 11.00
dnl dl_module_id_1 member
dnl
dnl usage:
dnl
dnl	AC_LBL_HP_PPA_INFO_T_DL_MODULE_ID_1
dnl
dnl results:
dnl
dnl	HAVE_HP_PPA_INFO_T_DL_MODULE_ID_1 (defined)
dnl
dnl NOTE: any compile failure means we conclude that it doesn't have
dnl that member, so if we don't have DLPI, don't have a <sys/dlpi_ext.h>
dnl header, or have one that doesn't declare a dl_hp_ppa_info_t type,
dnl we conclude it doesn't have that member (which is OK, as either we
dnl won't be using code that would use that member, or we wouldn't
dnl compile in any case).
dnl
AC_DEFUN(AC_LBL_HP_PPA_INFO_T_DL_MODULE_ID_1,
    [AC_MSG_CHECKING(if dl_hp_ppa_info_t struct has dl_module_id_1 member)
    AC_CACHE_VAL(ac_cv_lbl_dl_hp_ppa_info_t_has_dl_module_id_1,
	AC_TRY_COMPILE([
#	include <sys/types.h>
#	include <sys/dlpi.h>
#	include <sys/dlpi_ext.h>],
	[u_int i = sizeof(((dl_hp_ppa_info_t *)0)->dl_module_id_1)],
	ac_cv_lbl_dl_hp_ppa_info_t_has_dl_module_id_1=yes,
	ac_cv_lbl_dl_hp_ppa_info_t_has_dl_module_id_1=no))
    AC_MSG_RESULT($ac_cv_lbl_dl_hp_ppa_info_t_has_dl_module_id_1)
    if test $ac_cv_lbl_dl_hp_ppa_info_t_has_dl_module_id_1 = yes ; then
	    AC_DEFINE(HAVE_HP_PPA_INFO_T_DL_MODULE_ID_1,1,[if ppa_info_t_dl_module_id exists])
    fi])

dnl
dnl Checks to see if -R is used
dnl
dnl usage:
dnl
dnl	AC_LBL_HAVE_RUN_PATH
dnl
dnl results:
dnl
dnl	ac_cv_lbl_have_run_path (yes or no)
dnl
AC_DEFUN(AC_LBL_HAVE_RUN_PATH,
    [AC_MSG_CHECKING(for ${CC-cc} -R)
    AC_CACHE_VAL(ac_cv_lbl_have_run_path,
	[echo 'main(){}' > conftest.c
	${CC-cc} -o conftest conftest.c -R/a1/b2/c3 >conftest.out 2>&1
	if test ! -s conftest.out ; then
		ac_cv_lbl_have_run_path=yes
	else
		ac_cv_lbl_have_run_path=no
	fi
	rm -f conftest*])
    AC_MSG_RESULT($ac_cv_lbl_have_run_path)
    ])

dnl
dnl Due to the stupid way it's implemented, AC_CHECK_TYPE is nearly useless.
dnl
dnl usage:
dnl
dnl	AC_LBL_CHECK_TYPE
dnl
dnl results:
dnl
dnl	int32_t (defined)
dnl	u_int32_t (defined)
dnl
AC_DEFUN(AC_LBL_CHECK_TYPE,
    [AC_MSG_CHECKING(for $1 using $CC)
    AC_CACHE_VAL(ac_cv_lbl_have_$1,
	AC_TRY_COMPILE([
#	include "confdefs.h"
#	include <sys/types.h>
#	if STDC_HEADERS
#	include <stdlib.h>
#	include <stddef.h>
#	endif],
	[$1 i],
	ac_cv_lbl_have_$1=yes,
	ac_cv_lbl_have_$1=no))
    AC_MSG_RESULT($ac_cv_lbl_have_$1)
    if test $ac_cv_lbl_have_$1 = no ; then
	    AC_DEFINE($1, $2, [if we have $1])
    fi])

dnl
dnl Checks to see if unaligned memory accesses fail
dnl
dnl usage:
dnl
dnl	AC_LBL_UNALIGNED_ACCESS
dnl
dnl results:
dnl
dnl	LBL_ALIGN (DEFINED)
dnl
AC_DEFUN(AC_LBL_UNALIGNED_ACCESS,
    [AC_MSG_CHECKING(if unaligned accesses fail)
    AC_CACHE_VAL(ac_cv_lbl_unaligned_fail,
	[case "$host_cpu" in

	#
	# These are CPU types where:
	#
	#	the CPU faults on an unaligned access, but at least some
	#	OSes that support that CPU catch the fault and simulate
	#	the unaligned access (e.g., Alpha/{Digital,Tru64} UNIX) -
	#	the simulation is slow, so we don't want to use it;
	#
	#	the CPU, I infer (from the old
	#
	# XXX: should also check that they don't do weird things (like on arm)
	#
	#	comment) doesn't fault on unaligned accesses, but doesn't
	#	do a normal unaligned fetch, either (e.g., presumably, ARM);
	#
	#	for whatever reason, the test program doesn't work
	#	(this has been claimed to be the case for several of those
	#	CPUs - I don't know what the problem is; the problem
	#	was reported as "the test program dumps core" for SuperH,
	#	but that's what the test program is *supposed* to do -
	#	it dumps core before it writes anything, so the test
	#	for an empty output file should find an empty output
	#	file and conclude that unaligned accesses don't work).
	#
	# This run-time test won't work if you're cross-compiling, so
	# in order to support cross-compiling for a particular CPU,
	# we have to wire in the list of CPU types anyway, as far as
	# I know, so perhaps we should just have a set of CPUs on
	# which we know it doesn't work, a set of CPUs on which we
	# know it does work, and have the script just fail on other
	# cpu types and update it when such a failure occurs.
	#
	alpha*|arm*|hp*|mips*|sh*|sparc*|ia64|nv1)
		ac_cv_lbl_unaligned_fail=yes
		;;

	*)
		cat >conftest.c <<EOF
#		include <sys/types.h>
#		include <sys/wait.h>
#		include <stdio.h>
		unsigned char a[[5]] = { 1, 2, 3, 4, 5 };
		main() {
		unsigned int i;
		pid_t pid;
		int status;
		/* avoid "core dumped" message */
		pid = fork();
		if (pid <  0)
			exit(2);
		if (pid > 0) {
			/* parent */
			pid = waitpid(pid, &status, 0);
			if (pid < 0)
				exit(3);
			exit(!WIFEXITED(status));
		}
		/* child */
		i = *(unsigned int *)&a[[1]];
		printf("%d\n", i);
		exit(0);
		}
EOF
		${CC-cc} -o conftest $CFLAGS $CPPFLAGS $LDFLAGS \
		    conftest.c $LIBS >/dev/null 2>&1
		if test ! -x conftest ; then
			dnl failed to compile for some reason
			ac_cv_lbl_unaligned_fail=yes
		else
			./conftest >conftest.out
			if test ! -s conftest.out ; then
				ac_cv_lbl_unaligned_fail=yes
			else
				ac_cv_lbl_unaligned_fail=no
			fi
		fi
		rm -f conftest* core core.conftest
		;;
	esac])
    AC_MSG_RESULT($ac_cv_lbl_unaligned_fail)
    if test $ac_cv_lbl_unaligned_fail = yes ; then
	    AC_DEFINE(LBL_ALIGN,1,[if unaligned access fails])
    fi])

dnl
dnl If using gcc and the file .devel exists:
dnl	Compile with -g (if supported) and -Wall
dnl	If using gcc 2, do extra prototype checking
dnl	If an os prototype include exists, symlink os-proto.h to it
dnl
dnl usage:
dnl
dnl	AC_LBL_DEVEL(copt)
dnl
dnl results:
dnl
dnl	$1 (copt appended)
dnl	HAVE_OS_PROTO_H (defined)
dnl	os-proto.h (symlinked)
dnl
AC_DEFUN(AC_LBL_DEVEL,
    [rm -f os-proto.h
    if test "${LBL_CFLAGS+set}" = set; then
	    $1="$$1 ${LBL_CFLAGS}"
    fi
    if test -f .devel ; then
	    if test "$GCC" = yes ; then
		    if test "${LBL_CFLAGS+set}" != set; then
			    if test "$ac_cv_prog_cc_g" = yes ; then
				    $1="-g $$1"
			    fi
			    $1="$$1 -Wall"
			    if test $ac_cv_lbl_gcc_vers -gt 1 ; then
				    $1="$$1 -Wmissing-prototypes -Wstrict-prototypes"
			    fi
		    fi
	    else
		    case "$target_os" in

		    irix6*)
			    V_CCOPT="$V_CCOPT -n32"
			    ;;

		    *)
			    ;;
		    esac
	    fi
	    os=`echo $target_os | sed -e 's/\([[0-9]][[0-9]]*\)[[^0-9]].*$/\1/'`
	    name="lbl/os-$os.h"
	    if test -f $name ; then
		    ln -s $name os-proto.h
		    AC_DEFINE(HAVE_OS_PROTO_H,1,[if there's an os_proto.h])
	    else
		    AC_MSG_WARN(can't find $name)
	    fi
    fi])

dnl
dnl Improved version of AC_CHECK_LIB
dnl
dnl Thanks to John Hawkinson ([e-mail])
dnl
dnl usage:
dnl
dnl	AC_LBL_CHECK_LIB(LIBRARY, FUNCTION [, ACTION-IF-FOUND [,
dnl	    ACTION-IF-NOT-FOUND [, OTHER-LIBRARIES]]])
dnl
dnl results:
dnl
dnl	LIBS
dnl

define(AC_LBL_CHECK_LIB,
[AC_MSG_CHECKING([for $2 in -l$1])
dnl Use a cache variable name containing both the library and function name,
dnl because the test really is for library $1 defining function $2, not
dnl just for library $1.  Separate tests with the same $1 and different $2's
dnl may have different results.
ac_lib_var=`echo $1['_']$2['_']$5 | sed 'y%./+- %__p__%'`
AC_CACHE_VAL(ac_cv_lbl_lib_$ac_lib_var,
[ac_save_LIBS="$LIBS"
LIBS="-l$1 $5 $LIBS"
AC_TRY_LINK(dnl
ifelse([$2], [main], , dnl Avoid conflicting decl of main.
[/* Override any gcc2 internal prototype to avoid an error.  */
]ifelse(AC_LANG, CPLUSPLUS, [#ifdef __cplusplus
extern "C"
#endif
])dnl
[/* We use char because int might match the return type of a gcc2
    builtin and then its argument prototype would still apply.  */
char $2();
]),
	    [$2()],
	    eval "ac_cv_lbl_lib_$ac_lib_var=yes",
	    eval "ac_cv_lbl_lib_$ac_lib_var=no")
LIBS="$ac_save_LIBS"
])dnl
if eval "test \"`echo '$ac_cv_lbl_lib_'$ac_lib_var`\" = yes"; then
  AC_MSG_RESULT(yes)
  ifelse([$3], ,
[changequote(, )dnl
  ac_tr_lib=HAVE_LIB`echo $1 | sed -e 's/[^a-zA-Z0-9_]/_/g' \
    -e 'y/abcdefghijklmnopqrstuvwxyz/ABCDEFGHIJKLMNOPQRSTUVWXYZ/'`
changequote([, ])dnl
  AC_DEFINE_UNQUOTED($ac_tr_lib)
  LIBS="-l$1 $LIBS"
], [$3])
else
  AC_MSG_RESULT(no)
ifelse([$4], , , [$4
])dnl
fi
])

dnl
dnl AC_LBL_LIBRARY_NET
dnl
dnl This test is for network applications that need socket() and
dnl gethostbyname() -ish functions.  Under Solaris, those applications
dnl need to link with "-lsocket -lnsl".  Under IRIX, they need to link
dnl with "-lnsl" but should *not* link with "-lsocket" because
dnl libsocket.a breaks a number of things (for instance:
dnl gethostbyname() under IRIX 5.2, and snoop sockets under most
dnl versions of IRIX).
dnl
dnl Unfortunately, many application developers are not aware of this,
dnl and mistakenly write tests that cause -lsocket to be used under
dnl IRIX.  It is also easy to write tests that cause -lnsl to be used
dnl under operating systems where neither are necessary (or useful),
dnl such as SunOS 4.1.4, which uses -lnsl for TLI.
dnl
dnl This test exists so that every application developer does not test
dnl this in a different, and subtly broken fashion.

dnl It has been argued that this test should be broken up into two
dnl seperate tests, one for the resolver libraries, and one for the
dnl libraries necessary for using Sockets API. Unfortunately, the two
dnl are carefully intertwined and allowing the autoconf user to use
dnl them independantly potentially results in unfortunate ordering
dnl dependancies -- as such, such component macros would have to
dnl carefully use indirection and be aware if the other components were
dnl executed. Since other autoconf macros do not go to this trouble,
dnl and almost no applications use sockets without the resolver, this
dnl complexity has not been implemented.
dnl
dnl The check for libresolv is in case you are attempting to link
dnl statically and happen to have a libresolv.a lying around (and no
dnl libnsl.a).
dnl
AC_DEFUN(AC_LBL_LIBRARY_NET, [
    # Most operating systems have gethostbyname() in the default searched
    # libraries (i.e. libc):
    AC_CHECK_FUNC(gethostbyname, ,
	# Some OSes (eg. Solaris) place it in libnsl:
	AC_LBL_CHECK_LIB(nsl, gethostbyname, , 
	    # Some strange OSes (SINIX) have it in libsocket:
	    AC_LBL_CHECK_LIB(socket, gethostbyname, ,
		# Unfortunately libsocket sometimes depends on libnsl.
		# AC_CHECK_LIB's API is essentially broken so the
		# following ugliness is necessary:
		AC_LBL_CHECK_LIB(socket, gethostbyname,
		    LIBS="-lsocket -lnsl $LIBS",
		    AC_CHECK_LIB(resolv, gethostbyname),
		    -lnsl))))
    AC_CHECK_FUNC(socket, , AC_CHECK_LIB(socket, socket, ,
	AC_LBL_CHECK_LIB(socket, socket, LIBS="-lsocket -lnsl $LIBS", ,
	    -lnsl)))
    # DLPI needs putmsg under HPUX so test for -lstr while we're at it
    AC_CHECK_LIB(str, putmsg)
    ])

dnl
dnl Test for __attribute__
dnl

AC_DEFUN(AC_C___ATTRIBUTE__, [
AC_MSG_CHECKING(for __attribute__)
AC_CACHE_VAL(ac_cv___attribute__, [
AC_TRY_COMPILE([
#include <stdlib.h>
],
[
static void foo(void) __attribute__ ((noreturn));

static void
foo(void)
{
  exit(1);
}
],
ac_cv___attribute__=yes,
ac_cv___attribute__=no)])
if test "$ac_cv___attribute__" = "yes"; then
  AC_DEFINE(HAVE___ATTRIBUTE__, 1, [define if your compiler has __attribute__])
  V_DEFS="$V_DEFS -D_U_=\"__attribute__((unused))\""
else
  V_DEFS="$V_DEFS -D_U_=\"\""
fi
AC_MSG_RESULT($ac_cv___attribute__)
])

dnl
dnl Checks to see if tpacket_stats is defined in linux/if_packet.h
dnl If so then pcap-linux.c can use this to report proper statistics.
dnl
dnl -Scott Barron
dnl
AC_DEFUN(AC_LBL_TPACKET_STATS,
   [AC_MSG_CHECKING(if if_packet.h has tpacket_stats defined)
   AC_CACHE_VAL(ac_cv_lbl_tpacket_stats,
   AC_TRY_COMPILE([
#  include <linux/if_packet.h>],
   [struct tpacket_stats stats],
   ac_cv_lbl_tpacket_stats=yes,
   ac_cv_lbl_tpacket_stats=no))
   AC_MSG_RESULT($ac_cv_lbl_tpacket_stats)
   if test $ac_cv_lbl_tpacket_stats = yes; then
       AC_DEFINE(HAVE_TPACKET_STATS,1,[if if_packet.h has tpacket_stats defined])
   fi])