readline/examples/rlfe/configure.in - native_client/nacl-gdb - Git at Google

 dnl Process this file with autoconf to produce a configure script.

 m4_include([../../../config/override.m4])

 AC_INIT(rlfe.c)
 AC_CONFIG_HEADER(config.h)
 VERSION=0.4
 AC_SUBST(VERSION)

 dnl
 dnl Define some useful macros
 dnl
 AC_DEFUN([AC_PROGRAM_SOURCE],
 [AC_REQUIRE([AC_PROG_CPP])AC_PROVIDE([$0])cat > conftest.c <<EOF
 #include "confdefs.h"
 [$1]
 _CUT_HERE_
 [$2]
 EOF
 eval "$ac_cpp conftest.c 2>&5 | sed -e '1,/_CUT_HERE_/d' -e 's/ //g' > conftest.out"
 . ./conftest.out
 rm -f conftest*
 ])dnl
 dnl
 define(AC_NOTE,
 [echo "$1" 1>&AC_FD_MSG
 ])dnl

 old_CFLAGS="$CFLAGS"
 AC_PROG_CC
 AC_PROG_CPP
 AC_PROG_GCC_TRADITIONAL
 AC_ISC_POSIX

 AC_TRY_RUN(main(){exit(0);},,[
 if test $CC != cc ; then
 AC_NOTE(Your $CC failed - restarting with CC=cc)
 AC_NOTE()
 CC=cc
 export CC
 exec $0 $configure_args
 fi
 ])

 AC_TRY_RUN(main(){exit(0);},,
 exec 5>&2
 eval $ac_link
 AC_NOTE(CC=$CC; CFLAGS=$CFLAGS; LIBS=$LIBS;)
 AC_NOTE($ac_compile)
 AC_MSG_ERROR(Can't run the compiler - sorry))

 AC_TRY_RUN([
 main()
 {
   int __something_strange_();
   __something_strange_(0);
 }
 ],AC_MSG_ERROR(Your compiler does not set the exit status - sorry))

 AC_PROG_AWK

 if test -f etc/toolcheck; then
 AC_CHECKING(for buggy tools)
 sh etc/toolcheck 1>&AC_FD_MSG
 fi

 dnl
 dnl    ****  special unix variants  ****
 dnl

 AC_CHECKING(for System V)
 AC_TRY_COMPILE(
 [#include <sys/types.h>
 #include <signal.h>
 #include <fcntl.h>], [int x = SIGCHLD | FNDELAY;], , AC_DEFINE(SYSV))

 AC_CHECKING(for Solaris 2.x)
 AC_EGREP_CPP(yes,
 [#if defined(SVR4) && defined(sun)
   yes
 #endif
 ], LIBS="$LIBS -lsocket -lnsl -lkstat")

 dnl
 dnl    ****  select()  ****
 dnl

 AC_CHECKING(select)
 AC_TRY_LINK(,[select(0, 0, 0, 0, 0);],,
 LIBS="$LIBS -lnet -lnsl"
 AC_CHECKING(select with $LIBS)
 AC_TRY_LINK(,[select(0, 0, 0, 0, 0);],,
 AC_MSG_ERROR(!!! no select - no screen))
 )
 dnl
 dnl    ****  check the select implementation ****
 dnl

 AC_CHECKING(select return value)
 AC_TRY_RUN([
 #include <sys/types.h>
 #include <sys/stat.h>
 #include <fcntl.h>

 char *nam = "/tmp/conftest$$";

 #ifdef NAMEDPIPE

 #ifndef O_NONBLOCK
 #define O_NONBLOCK O_NDELAY
 #endif
 #ifndef S_IFIFO
 #define S_IFIFO 0010000
 #endif


 main()
 {
 #ifdef FD_SET
   fd_set f;
 #else
   int f;
 #endif

 #ifdef __FreeBSD__
 /* From Andrew A. Chernov (ache@astral.msk.su):
  * opening RDWR fifo fails in BSD 4.4, but select return values are
  * right.
  */
   exit(0);
 #endif
   (void)alarm(5);
 #ifdef POSIX
   if (mkfifo(nam, 0777))
 #else
   if (mknod(nam, S_IFIFO|0777, 0))
 #endif
     exit(1);
   close(0);
   if (open(nam, O_RDWR | O_NONBLOCK))
     exit(1);
   if (write(0, "TEST", 4) == -1)
     exit(1);

 #else

 #include <sys/types.h>
 #include <sys/socket.h>
 #include <sys/un.h>

 main()
 {
   int s1, s2, l;
   struct sockaddr_un a;
 #ifdef FD_SET
   fd_set f;
 #else
   int f;
 #endif

   (void)alarm(5);
   if ((s1 = socket(AF_UNIX, SOCK_STREAM, 0)) == -1)
     exit(1);
   a.sun_family = AF_UNIX;
   strcpy(a.sun_path, nam);
   (void) unlink(nam);
   if (bind(s1, (struct sockaddr *) &a, strlen(nam)+2) == -1)
     exit(1);
   if (listen(s1, 2))
     exit(1);
   if (fork() == 0)
     {
       if ((s2 = socket(AF_UNIX, SOCK_STREAM, 0)) == -1)
 	kill(getppid(), 3);
       (void)connect(s2, (struct sockaddr *)&a, strlen(nam) + 2);
       if (write(s2, "HELLO", 5) == -1)
 	kill(getppid(), 3);
       exit(0);
     }
   l = sizeof(a);
   close(0);
   if (accept(s1, (struct sockaddr *)&a, &l))
     exit(1);
 #endif


 #ifdef FD_SET
   FD_SET(0, &f);
 #else
   f = 1;
 #endif
   if (select(1, &f, 0, 0, 0) == -1)
     exit(1);
   if (select(1, &f, &f, 0, 0) != 2)
     exit(1);
   exit(0);
 }
 ],AC_NOTE(- select is ok),
 AC_NOTE(- select can't count) AC_DEFINE(SELECT_BROKEN))

 dnl
 dnl    ****  termcap or terminfo  ****
 dnl
 AC_CHECKING(for tgetent)
 AC_TRY_LINK(,tgetent((char *)0, (char *)0);,,
 olibs="$LIBS"
 LIBS="-lcurses $olibs"
 AC_CHECKING(libcurses)
 AC_TRY_LINK(,[
 #ifdef __hpux
 __sorry_hpux_libcurses_is_totally_broken_in_10_10();
 #else
 tgetent((char *)0, (char *)0);
 #endif
 ],,
 LIBS="-ltermcap $olibs"
 AC_CHECKING(libtermcap)
 AC_TRY_LINK(,tgetent((char *)0, (char *)0);,,
 LIBS="-ltermlib $olibs"
 AC_CHECKING(libtermlib)
 AC_TRY_LINK(,tgetent((char *)0, (char *)0);,,
 LIBS="-lncurses $olibs"
 AC_CHECKING(libncurses)
 AC_TRY_LINK(,tgetent((char *)0, (char *)0);,,
 AC_MSG_ERROR(!!! no tgetent - no screen))))))

 AC_TRY_RUN([
 main()
 {
  exit(strcmp(tgoto("%p1%d", 0, 1), "1") ? 0 : 1);
 }], AC_NOTE(- you use the termcap database),
 AC_NOTE(- you use the terminfo database) AC_DEFINE(TERMINFO))
 AC_CHECKING(ospeed)
 AC_TRY_LINK(extern short ospeed;,ospeed=5;,,AC_DEFINE(NEED_OSPEED))

 dnl
 dnl    ****  PTY specific things  ****
 dnl
 AC_CHECKING(for /dev/ptc)
 if test -r /dev/ptc; then
 AC_DEFINE(HAVE_DEV_PTC)
 fi

 AC_CHECKING(for SVR4 ptys)
 sysvr4ptys=
 if test -c /dev/ptmx ; then
 AC_TRY_LINK([],[ptsname(0);grantpt(0);unlockpt(0);],[AC_DEFINE(HAVE_SVR4_PTYS)
 sysvr4ptys=1])
 fi

 AC_CHECK_FUNCS(getpt)

 dnl check for openpty()
 if test -z "$sysvr4ptys"; then
 AC_CHECK_FUNCS(openpty,,
 [AC_CHECK_LIB(util,openpty, [AC_DEFINE(HAVE_OPENPTY)] [LIBS="$LIBS -lutil"])])
 fi

 AC_CHECKING(for ptyranges)
 if test -d /dev/ptym ; then
 pdir='/dev/ptym'
 else
 pdir='/dev'
 fi
 dnl SCO uses ptyp%d
 AC_EGREP_CPP(yes,
 [#ifdef M_UNIX
    yes;
 #endif
 ], ptys=`echo /dev/ptyp??`, ptys=`echo $pdir/pty??`)
 dnl if test -c /dev/ptyp19; then
 dnl ptys=`echo /dev/ptyp??`
 dnl else
 dnl ptys=`echo $pdir/pty??`
 dnl fi
 if test "$ptys" != "$pdir/pty??" ; then
 p0=`echo $ptys | tr ' ' '\012' | sed -e 's/^.*\(.\).$/\1/g' | sort -u | tr -d '\012'`
 p1=`echo $ptys | tr ' ' '\012' | sed -e 's/^.*\(.\)$/\1/g'  | sort -u | tr -d '\012'`
 AC_DEFINE_UNQUOTED(PTYRANGE0,"$p0")
 AC_DEFINE_UNQUOTED(PTYRANGE1,"$p1")
 fi

 dnl    ****  pty mode/group handling ****
 dnl
 dnl support provided by Luke Mewburn <lm@rmit.edu.au>, 931222
 AC_ARG_WITH(pty-mode, [  --with-pty-mode=mode    default mode for ptys], [ ptymode="${withval}" ])
 AC_ARG_WITH(pty-group, [  --with-pty-group=group  default group for ptys], [ ptygrp="${withval}" ])
 test -n "$ptymode" || ptymode=0620
 if test -n "$ptygrp" ; then
 AC_DEFINE_UNQUOTED(PTYMODE, $ptymode)
 AC_DEFINE_UNQUOTED(PTYGROUP,$ptygrp)
 else

 AC_CHECKING(default tty permissions/group)
 rm -f conftest_grp
 AC_TRY_RUN([
 #include <sys/types.h>
 #include <sys/stat.h>
 #include <stdio.h>
 main()
 {
   struct stat sb;
   char *x,*ttyname();
   int om, m;
   FILE *fp;

   if (!(x = ttyname(0))) exit(1);
   if (stat(x, &sb)) exit(1);
   om = sb.st_mode;
   if (om & 002) exit(0);
   m = system("mesg y");
   if (m == -1 || m == 127) exit(1);
   if (stat(x, &sb)) exit(1);
   m = sb.st_mode;
   if (chmod(x, om)) exit(1);
   if (m & 002) exit(0);
   if (sb.st_gid == getgid()) exit(1);
   if (!(fp=fopen("conftest_grp", "w")))
     exit(1);
   fprintf(fp, "%d\n", sb.st_gid);
   fclose(fp);
   exit(0);
 }
 ],[
     if test -f conftest_grp; then
 	ptygrp=`cat conftest_grp`
 	AC_NOTE([- pty mode: $ptymode, group: $ptygrp])
 	AC_DEFINE_UNQUOTED(PTYMODE, $ptymode)
 	AC_DEFINE_UNQUOTED(PTYGROUP,$ptygrp)
     else
 	AC_NOTE(- ptys are world accessable)
     fi
 ],[
     WRITEPATH=''
     XTERMPATH=''
     AC_PATH_PROG(WRITEPATH, write)
     AC_PATH_PROG(XTERMPATH, xterm)
     found=
     if test -n "$WRITEPATH$XTERMPATH"; then
       findfollow=
       lsfollow=
       found=`find $WRITEPATH $XTERMPATH -follow -print 2>/dev/null`
       if test -n "$found"; then
 	findfollow=-follow
 	lsfollow=L
       fi
       if test -n "$XTERMPATH"; then
 	ptygrpn=`ls -l$lsfollow $XTERMPATH | sed -n -e 1p | $AWK '{print $4}'`
 	if test tty != "$ptygrpn"; then
 	  XTERMPATH=
 	fi
       fi
     fi
     if test -n "$WRITEPATH$XTERMPATH"; then
       found=`find $WRITEPATH $XTERMPATH $findfollow -perm -2000 -print`
       if test -n "$found"; then
 	ptygrp=`ls -ln$lsfollow $found | sed -n -e 1p | $AWK '{print $4}'`
 	AC_NOTE([- pty mode: $ptymode, group: $ptygrp])
 	AC_DEFINE_UNQUOTED(PTYMODE, $ptymode)
 	AC_DEFINE_UNQUOTED(PTYGROUP,$ptygrp)
       else
 	AC_NOTE(- ptys are world accessable)
       fi
     else
       AC_NOTE(- can't determine - assume ptys are world accessable)
     fi
   ]
 )
 rm -f conftest_grp
 fi

 dnl
 dnl    ****  signal handling  ****
 dnl
 if test -n "$posix" ; then

 dnl POSIX has reliable signals with void return type.
 AC_NOTE(assuming posix signal definition)
 AC_DEFINE(SIGVOID)

 else

 AC_CHECKING(return type of signal handlers)
 AC_TRY_COMPILE(
 [#include <sys/types.h>
 #include <signal.h>
 #ifdef signal
 #undef signal
 #endif
 extern void (*signal ()) ();], [int i;], AC_DEFINE(SIGVOID))
 AC_CHECKING(sigset)
 AC_TRY_LINK([
 #include <sys/types.h>
 #include <signal.h>
 ],[
 #ifdef SIGVOID
 sigset(0, (void (*)())0);
 #else
 sigset(0, (int (*)())0);
 #endif
 ], AC_DEFINE(USESIGSET))
 AC_CHECKING(signal implementation)
 AC_TRY_RUN([
 #include <sys/types.h>
 #include <signal.h>

 #ifndef SIGCLD
 #define SIGCLD SIGCHLD
 #endif
 #ifdef USESIGSET
 #define signal sigset
 #endif

 int got;

 #ifdef SIGVOID
 void
 #endif
 hand()
 {
   got++;
 }

 main()
 {
   /* on hpux we use sigvec to get bsd signals */
 #ifdef __hpux
   (void)signal(SIGCLD, hand);
   kill(getpid(), SIGCLD);
   kill(getpid(), SIGCLD);
   if (got < 2)
     exit(1);
 #endif
   exit(0);
 }
 ],,AC_DEFINE(SYSVSIGS))

 fi

 AC_CHECK_HEADERS(sys/stropts.h sys/wait.h)

 AC_OUTPUT(Makefile)
	dnl Process this file with autoconf to produce a configure script.

	m4_include([../../../config/override.m4])

	AC_INIT(rlfe.c)
	AC_CONFIG_HEADER(config.h)
	VERSION=0.4
	AC_SUBST(VERSION)

	dnl
	dnl Define some useful macros
	dnl
	AC_DEFUN([AC_PROGRAM_SOURCE],
	[AC_REQUIRE([AC_PROG_CPP])AC_PROVIDE([$0])cat > conftest.c <<EOF
	#include "confdefs.h"
	[$1]
	_CUT_HERE_
	[$2]
	EOF
	eval "$ac_cpp conftest.c 2>&5 \| sed -e '1,/_CUT_HERE_/d' -e 's/ //g' > conftest.out"
	. ./conftest.out
	rm -f conftest*
	])dnl
	dnl
	define(AC_NOTE,
	[echo "$1" 1>&AC_FD_MSG
	])dnl

	old_CFLAGS="$CFLAGS"
	AC_PROG_CC
	AC_PROG_CPP
	AC_PROG_GCC_TRADITIONAL
	AC_ISC_POSIX

	AC_TRY_RUN(main(){exit(0);},,[
	if test $CC != cc ; then
	AC_NOTE(Your $CC failed - restarting with CC=cc)
	AC_NOTE()
	CC=cc
	export CC
	exec $0 $configure_args
	fi
	])

	AC_TRY_RUN(main(){exit(0);},,
	exec 5>&2
	eval $ac_link
	AC_NOTE(CC=$CC; CFLAGS=$CFLAGS; LIBS=$LIBS;)
	AC_NOTE($ac_compile)
	AC_MSG_ERROR(Can't run the compiler - sorry))

	AC_TRY_RUN([
	main()
	{
	int __something_strange_();
	__something_strange_(0);
	}
	],AC_MSG_ERROR(Your compiler does not set the exit status - sorry))

	AC_PROG_AWK

	if test -f etc/toolcheck; then
	AC_CHECKING(for buggy tools)
	sh etc/toolcheck 1>&AC_FD_MSG
	fi

	dnl
	dnl ** special unix variants **
	dnl

	AC_CHECKING(for System V)
	AC_TRY_COMPILE(
	[#include <sys/types.h>
	#include <signal.h>
	#include <fcntl.h>], [int x = SIGCHLD \| FNDELAY;], , AC_DEFINE(SYSV))

	AC_CHECKING(for Solaris 2.x)
	AC_EGREP_CPP(yes,
	[#if defined(SVR4) && defined(sun)
	yes
	#endif
	], LIBS="$LIBS -lsocket -lnsl -lkstat")

	dnl
	dnl ** select() **
	dnl

	AC_CHECKING(select)
	AC_TRY_LINK(,[select(0, 0, 0, 0, 0);],,
	LIBS="$LIBS -lnet -lnsl"
	AC_CHECKING(select with $LIBS)
	AC_TRY_LINK(,[select(0, 0, 0, 0, 0);],,
	AC_MSG_ERROR(!!! no select - no screen))
	)
	dnl
	dnl ** check the select implementation **
	dnl

	AC_CHECKING(select return value)
	AC_TRY_RUN([
	#include <sys/types.h>
	#include <sys/stat.h>
	#include <fcntl.h>

	char *nam = "/tmp/conftest$$";

	#ifdef NAMEDPIPE

	#ifndef O_NONBLOCK
	#define O_NONBLOCK O_NDELAY
	#endif
	#ifndef S_IFIFO
	#define S_IFIFO 0010000
	#endif


	main()
	{
	#ifdef FD_SET
	fd_set f;
	#else
	int f;
	#endif

	#ifdef __FreeBSD__
	/* From Andrew A. Chernov (ache@astral.msk.su):
	* opening RDWR fifo fails in BSD 4.4, but select return values are
	* right.
	*/
	exit(0);
	#endif
	(void)alarm(5);
	#ifdef POSIX
	if (mkfifo(nam, 0777))
	#else
	if (mknod(nam, S_IFIFO\|0777, 0))
	#endif
	exit(1);
	close(0);
	if (open(nam, O_RDWR \| O_NONBLOCK))
	exit(1);
	if (write(0, "TEST", 4) == -1)
	exit(1);

	#else

	#include <sys/types.h>
	#include <sys/socket.h>
	#include <sys/un.h>

	main()
	{
	int s1, s2, l;
	struct sockaddr_un a;
	#ifdef FD_SET
	fd_set f;
	#else
	int f;
	#endif

	(void)alarm(5);
	if ((s1 = socket(AF_UNIX, SOCK_STREAM, 0)) == -1)
	exit(1);
	a.sun_family = AF_UNIX;
	strcpy(a.sun_path, nam);
	(void) unlink(nam);
	if (bind(s1, (struct sockaddr *) &a, strlen(nam)+2) == -1)
	exit(1);
	if (listen(s1, 2))
	exit(1);
	if (fork() == 0)
	{
	if ((s2 = socket(AF_UNIX, SOCK_STREAM, 0)) == -1)
	kill(getppid(), 3);
	(void)connect(s2, (struct sockaddr *)&a, strlen(nam) + 2);
	if (write(s2, "HELLO", 5) == -1)
	kill(getppid(), 3);
	exit(0);
	}
	l = sizeof(a);
	close(0);
	if (accept(s1, (struct sockaddr *)&a, &l))
	exit(1);
	#endif


	#ifdef FD_SET
	FD_SET(0, &f);
	#else
	f = 1;
	#endif
	if (select(1, &f, 0, 0, 0) == -1)
	exit(1);
	if (select(1, &f, &f, 0, 0) != 2)
	exit(1);
	exit(0);
	}
	],AC_NOTE(- select is ok),
	AC_NOTE(- select can't count) AC_DEFINE(SELECT_BROKEN))

	dnl
	dnl ** termcap or terminfo **
	dnl
	AC_CHECKING(for tgetent)
	AC_TRY_LINK(,tgetent((char )0, (char )0);,,
	olibs="$LIBS"
	LIBS="-lcurses $olibs"
	AC_CHECKING(libcurses)
	AC_TRY_LINK(,[
	#ifdef __hpux
	__sorry_hpux_libcurses_is_totally_broken_in_10_10();
	#else
	tgetent((char )0, (char )0);
	#endif
	],,
	LIBS="-ltermcap $olibs"
	AC_CHECKING(libtermcap)
	AC_TRY_LINK(,tgetent((char )0, (char )0);,,
	LIBS="-ltermlib $olibs"
	AC_CHECKING(libtermlib)
	AC_TRY_LINK(,tgetent((char )0, (char )0);,,
	LIBS="-lncurses $olibs"
	AC_CHECKING(libncurses)
	AC_TRY_LINK(,tgetent((char )0, (char )0);,,
	AC_MSG_ERROR(!!! no tgetent - no screen))))))

	AC_TRY_RUN([
	main()
	{
	exit(strcmp(tgoto("%p1%d", 0, 1), "1") ? 0 : 1);
	}], AC_NOTE(- you use the termcap database),
	AC_NOTE(- you use the terminfo database) AC_DEFINE(TERMINFO))
	AC_CHECKING(ospeed)
	AC_TRY_LINK(extern short ospeed;,ospeed=5;,,AC_DEFINE(NEED_OSPEED))

	dnl
	dnl ** PTY specific things **
	dnl
	AC_CHECKING(for /dev/ptc)
	if test -r /dev/ptc; then
	AC_DEFINE(HAVE_DEV_PTC)
	fi

	AC_CHECKING(for SVR4 ptys)
	sysvr4ptys=
	if test -c /dev/ptmx ; then
	AC_TRY_LINK([],[ptsname(0);grantpt(0);unlockpt(0);],[AC_DEFINE(HAVE_SVR4_PTYS)
	sysvr4ptys=1])
	fi

	AC_CHECK_FUNCS(getpt)

	dnl check for openpty()
	if test -z "$sysvr4ptys"; then
	AC_CHECK_FUNCS(openpty,,
	[AC_CHECK_LIB(util,openpty, [AC_DEFINE(HAVE_OPENPTY)] [LIBS="$LIBS -lutil"])])
	fi

	AC_CHECKING(for ptyranges)
	if test -d /dev/ptym ; then
	pdir='/dev/ptym'
	else
	pdir='/dev'
	fi
	dnl SCO uses ptyp%d
	AC_EGREP_CPP(yes,
	[#ifdef M_UNIX
	yes;
	#endif
	], ptys=`echo /dev/ptyp??`, ptys=`echo $pdir/pty??`)
	dnl if test -c /dev/ptyp19; then
	dnl ptys=`echo /dev/ptyp??`
	dnl else
	dnl ptys=`echo $pdir/pty??`
	dnl fi
	if test "$ptys" != "$pdir/pty??" ; then
	p0=`echo $ptys \| tr ' ' '\012' \| sed -e 's/^.*\(.\).$/\1/g' \| sort -u \| tr -d '\012'`
	p1=`echo $ptys \| tr ' ' '\012' \| sed -e 's/^.*\(.\)$/\1/g' \| sort -u \| tr -d '\012'`
	AC_DEFINE_UNQUOTED(PTYRANGE0,"$p0")
	AC_DEFINE_UNQUOTED(PTYRANGE1,"$p1")
	fi

	dnl ** pty mode/group handling **
	dnl
	dnl support provided by Luke Mewburn <lm@rmit.edu.au>, 931222
	AC_ARG_WITH(pty-mode, [ --with-pty-mode=mode default mode for ptys], [ ptymode="${withval}" ])
	AC_ARG_WITH(pty-group, [ --with-pty-group=group default group for ptys], [ ptygrp="${withval}" ])
	test -n "$ptymode" \|\| ptymode=0620
	if test -n "$ptygrp" ; then
	AC_DEFINE_UNQUOTED(PTYMODE, $ptymode)
	AC_DEFINE_UNQUOTED(PTYGROUP,$ptygrp)
	else

	AC_CHECKING(default tty permissions/group)
	rm -f conftest_grp
	AC_TRY_RUN([
	#include <sys/types.h>
	#include <sys/stat.h>
	#include <stdio.h>
	main()
	{
	struct stat sb;
	char x,ttyname();
	int om, m;
	FILE *fp;

	if (!(x = ttyname(0))) exit(1);
	if (stat(x, &sb)) exit(1);
	om = sb.st_mode;
	if (om & 002) exit(0);
	m = system("mesg y");
	if (m == -1 \|\| m == 127) exit(1);
	if (stat(x, &sb)) exit(1);
	m = sb.st_mode;
	if (chmod(x, om)) exit(1);
	if (m & 002) exit(0);
	if (sb.st_gid == getgid()) exit(1);
	if (!(fp=fopen("conftest_grp", "w")))
	exit(1);
	fprintf(fp, "%d\n", sb.st_gid);
	fclose(fp);
	exit(0);
	}
	],[
	if test -f conftest_grp; then
	ptygrp=`cat conftest_grp`
	AC_NOTE([- pty mode: $ptymode, group: $ptygrp])
	AC_DEFINE_UNQUOTED(PTYMODE, $ptymode)
	AC_DEFINE_UNQUOTED(PTYGROUP,$ptygrp)
	else
	AC_NOTE(- ptys are world accessable)
	fi
	],[
	WRITEPATH=''
	XTERMPATH=''
	AC_PATH_PROG(WRITEPATH, write)
	AC_PATH_PROG(XTERMPATH, xterm)
	found=
	if test -n "$WRITEPATH$XTERMPATH"; then
	findfollow=
	lsfollow=
	found=`find $WRITEPATH $XTERMPATH -follow -print 2>/dev/null`
	if test -n "$found"; then
	findfollow=-follow
	lsfollow=L
	fi
	if test -n "$XTERMPATH"; then
	ptygrpn=`ls -l$lsfollow $XTERMPATH \| sed -n -e 1p \| $AWK '{print $4}'`
	if test tty != "$ptygrpn"; then
	XTERMPATH=
	fi
	fi
	fi
	if test -n "$WRITEPATH$XTERMPATH"; then
	found=`find $WRITEPATH $XTERMPATH $findfollow -perm -2000 -print`
	if test -n "$found"; then
	ptygrp=`ls -ln$lsfollow $found \| sed -n -e 1p \| $AWK '{print $4}'`
	AC_NOTE([- pty mode: $ptymode, group: $ptygrp])
	AC_DEFINE_UNQUOTED(PTYMODE, $ptymode)
	AC_DEFINE_UNQUOTED(PTYGROUP,$ptygrp)
	else
	AC_NOTE(- ptys are world accessable)
	fi
	else
	AC_NOTE(- can't determine - assume ptys are world accessable)
	fi
	]
	)
	rm -f conftest_grp
	fi

	dnl
	dnl ** signal handling **
	dnl
	if test -n "$posix" ; then

	dnl POSIX has reliable signals with void return type.
	AC_NOTE(assuming posix signal definition)
	AC_DEFINE(SIGVOID)

	else

	AC_CHECKING(return type of signal handlers)
	AC_TRY_COMPILE(
	[#include <sys/types.h>
	#include <signal.h>
	#ifdef signal
	#undef signal
	#endif
	extern void (*signal ()) ();], [int i;], AC_DEFINE(SIGVOID))
	AC_CHECKING(sigset)
	AC_TRY_LINK([
	#include <sys/types.h>
	#include <signal.h>
	],[
	#ifdef SIGVOID
	sigset(0, (void (*)())0);
	#else
	sigset(0, (int (*)())0);
	#endif
	], AC_DEFINE(USESIGSET))
	AC_CHECKING(signal implementation)
	AC_TRY_RUN([
	#include <sys/types.h>
	#include <signal.h>

	#ifndef SIGCLD
	#define SIGCLD SIGCHLD
	#endif
	#ifdef USESIGSET
	#define signal sigset
	#endif

	int got;

	#ifdef SIGVOID
	void
	#endif
	hand()
	{
	got++;
	}

	main()
	{
	/* on hpux we use sigvec to get bsd signals */
	#ifdef __hpux
	(void)signal(SIGCLD, hand);
	kill(getpid(), SIGCLD);
	kill(getpid(), SIGCLD);
	if (got < 2)
	exit(1);
	#endif
	exit(0);
	}
	],,AC_DEFINE(SYSVSIGS))

	fi

	AC_CHECK_HEADERS(sys/stropts.h sys/wait.h)

	AC_OUTPUT(Makefile)