aclocal.m4 - platform/external/strace - Gitiles

 dnl ### A macro to find the include directory, useful for cross-compiling.
 AC_DEFUN(AC_INCLUDEDIR,
 [AC_REQUIRE([AC_PROG_AWK])dnl
 AC_SUBST(includedir)
 AC_MSG_CHECKING(for primary include directory)
 includedir=/usr/include
 if test -n "$GCC"
 then
 	>conftest.c
 	new_includedir=`
 		$CC -v -E conftest.c 2>&1 | $AWK '
 			/^End of search list/ { print last; exit }
 			{ last = [$]1 }
 		'
 	`
 	rm -f conftest.c
 	if test -n "$new_includedir" && test -d "$new_includedir"
 	then
 		includedir=$new_includedir
 	fi
 fi
 AC_MSG_RESULT($includedir)
 ])

 dnl ### A macro to automatically set different CC and HOSTCC if using gcc.
 define(AC_PROG_HOSTCC,
 [AC_SUBST(HOSTCC)dnl
 if test -z "$HOSTCC"
 then
 	HOSTCC="$CC"
 	if test -n "$GCC"
 	then
 		# Find out if gcc groks our host.
 		worked=
 		last=
 		for i in $1
 		do
 			test "x$i" = "x$last" && continue
 			last="$i"
 			CC="$HOSTCC -b $i"
 			AC_MSG_CHECKING([for working $CC])
 			AC_TRY_LINK(,,
 				worked=1
 				break
 			)
 			AC_MSG_RESULT(no)
 		done
 		if test -z "$worked"
 		then
 			CC="$HOSTCC"
 		else
 			AC_MSG_RESULT(yes)
 		fi
 	fi
 fi
 ])

 dnl ### A macro to set gcc warning flags.
 define(AC_WARNFLAGS,
 [AC_SUBST(WARNFLAGS)
 if test -z "$WARNFLAGS"
 then
 	if test -n "$GCC"
 	then
 		# If we're using gcc we want warning flags.
 		WARNFLAGS=-Wall
 	fi
 fi
 ])

 dnl ### A macro to determine if we have a "MP" type procfs
 AC_DEFUN(AC_MP_PROCFS,
 [AC_MSG_CHECKING(for MP procfs)
 AC_CACHE_VAL(ac_cv_mp_procfs,
 [AC_TRY_RUN([
 #include <stdio.h>
 #include <signal.h>
 #include <sys/procfs.h>

 main()
 {
 	int pid;
 	char proc[32];
 	FILE *ctl;
 	FILE *status;
 	int cmd;
 	struct pstatus pstatus;

 	if ((pid = fork()) == 0) {
 		pause();
 		exit(0);
 	}
 	sprintf(proc, "/proc/%d/ctl", pid);
 	if ((ctl = fopen(proc, "w")) == NULL)
 		goto fail;
 	sprintf(proc, "/proc/%d/status", pid);
 	if ((status = fopen (proc, "r")) == NULL)
 		goto fail;
 	cmd = PCSTOP;
 	if (write (fileno (ctl), &cmd, sizeof cmd) < 0)
 		goto fail;
 	if (read (fileno (status), &pstatus, sizeof pstatus) < 0)
 		goto fail;
 	kill(pid, SIGKILL);
 	exit(0);
 fail:
 	kill(pid, SIGKILL);
 	exit(1);
 }
 ],
 ac_cv_mp_procfs=yes,
 ac_cv_mp_procfs=no,
 [
 # Guess or punt.
 case "$host_os" in
 svr4.2*|svr5*)
 	ac_cv_mp_procfs=yes
 	;;
 *)
 	ac_cv_mp_procfs=no
 	;;
 esac
 ])])
 AC_MSG_RESULT($ac_cv_mp_procfs)
 if test "$ac_cv_mp_procfs" = yes
 then
 	AC_DEFINE(HAVE_MP_PROCFS)
 fi
 ])

 dnl ### A macro to determine if procfs is pollable.
 AC_DEFUN(AC_POLLABLE_PROCFS,
 [AC_MSG_CHECKING(for pollable procfs)
 AC_CACHE_VAL(ac_cv_pollable_procfs,
 [AC_TRY_RUN([
 #include <stdio.h>
 #include <signal.h>
 #include <sys/procfs.h>
 #include <sys/stropts.h>
 #include <poll.h>

 #ifdef HAVE_MP_PROCFS
 #define PIOCSTOP	PCSTOP
 #define POLLWANT	POLLWRNORM
 #define PROC		"/proc/%d/ctl"
 #define PROC_MODE	"w"
 int IOCTL (int fd, int cmd, int arg) {
 	return write (fd, &cmd, sizeof cmd);
 }
 #else
 #define POLLWANT	POLLPRI
 #define	PROC		"/proc/%d"
 #define PROC_MODE	"r+"
 #define IOCTL		ioctl
 #endif

 main()
 {
 	int pid;
 	char proc[32];
 	FILE *pfp;
 	struct pollfd pfd;

 	if ((pid = fork()) == 0) {
 		pause();
 		exit(0);
 	}
 	sprintf(proc, PROC, pid);
 	if ((pfp = fopen(proc, PROC_MODE)) == NULL)
 		goto fail;
 	if (IOCTL(fileno(pfp), PIOCSTOP, NULL) < 0)
 		goto fail;
 	pfd.fd = fileno(pfp);
 	pfd.events = POLLWANT;
 	if (poll(&pfd, 1, 0) < 0)
 		goto fail;
 	if (!(pfd.revents & POLLWANT))
 		goto fail;
 	kill(pid, SIGKILL);
 	exit(0);
 fail:
 	kill(pid, SIGKILL);
 	exit(1);
 }
 ],
 ac_cv_pollable_procfs=yes,
 ac_cv_pollable_procfs=no,
 [
 # Guess or punt.
 case "$host_os" in
 solaris2*|irix5*|svr4.2uw*|svr5*)
 	ac_cv_pollable_procfs=yes
 	;;
 *)
 	ac_cv_pollable_procfs=no
 	;;
 esac
 ])])
 AC_MSG_RESULT($ac_cv_pollable_procfs)
 if test "$ac_cv_pollable_procfs" = yes
 then
 	AC_DEFINE(HAVE_POLLABLE_PROCFS)
 fi
 ])

 dnl ### A macro to determine if the prstatus structure has a pr_syscall member.
 AC_DEFUN(AC_STRUCT_PR_SYSCALL,
 [AC_MSG_CHECKING(for pr_syscall in struct prstatus)
 AC_CACHE_VAL(ac_cv_struct_pr_syscall,
 [AC_TRY_COMPILE([#include <sys/procfs.h>],
 [#ifdef HAVE_MP_PROCFS
 pstatus_t s;
 s.pr_lwp.pr_syscall
 #else
 prstatus_t s;
 s.pr_syscall
 #endif],
 ac_cv_struct_pr_syscall=yes,
 ac_cv_struct_pr_syscall=no)])
 AC_MSG_RESULT($ac_cv_struct_pr_syscall)
 if test "$ac_cv_struct_pr_syscall" = yes
 then
 	AC_DEFINE(HAVE_PR_SYSCALL)
 fi
 ])

 dnl ### A macro to detect the presence of the sig_atomic_t in signal.h
 AC_DEFUN(AC_SIG_ATOMIC_T,
 [AC_MSG_CHECKING(for sig_atomic_t in signal.h)
 AC_CACHE_VAL(ac_cv_sig_atomic_t,
 [AC_TRY_COMPILE([#include <signal.h>],
 [sig_atomic_t x;],
 ac_cv_sig_atomic_t=yes,
 ac_cv_sig_atomic_t=no)])
 AC_MSG_RESULT($ac_cv_sig_atomic_t)
 if test "$ac_cv_sig_atomic_t" = yes
 then
 	AC_DEFINE(HAVE_SIG_ATOMIC_T)
 fi
 ])

 dnl ### A macro to detect the presence of the siginfo_t in signal.h
 AC_DEFUN(AC_SIGINFO_T,
 [AC_MSG_CHECKING(for siginfo_t in signal.h)
 AC_CACHE_VAL(ac_cv_siginfo_t,
 [AC_TRY_COMPILE([#include <signal.h>],
 [siginfo_t x;],
 ac_cv_siginfo_t=yes,
 ac_cv_siginfo_t=no)])
 AC_MSG_RESULT($ac_cv_siginfo_t)
 if test "$ac_cv_siginfo_t" = yes
 then
 	AC_DEFINE(HAVE_SIGINFO_T)
 fi
 ])

 dnl ### A macro to determine if sys_errlist is declared.
 AC_DEFUN(AC_DECL_SYS_ERRLIST,
 [AC_MSG_CHECKING([for sys_errlist declaration])
 AC_CACHE_VAL(ac_cv_decl_sys_errlist,
 [AC_TRY_COMPILE([#include <sys/types.h>
 #include <errno.h>
 #include <stdio.h>
 /* Somebody might declare sys_errlist in unistd.h.  */
 #ifdef HAVE_UNISTD_H
 #include <unistd.h>
 #endif], [char *msg = *(sys_errlist + 1);],
   ac_cv_decl_sys_errlist=yes, ac_cv_decl_sys_errlist=no)])dnl
 AC_MSG_RESULT($ac_cv_decl_sys_errlist)
 if test $ac_cv_decl_sys_errlist = yes; then
   AC_DEFINE(SYS_ERRLIST_DECLARED)
 fi
 ])

 dnl ### A macro to determine if _sys_siglist is declared.
 AC_DEFUN(AC_DECL__SYS_SIGLIST,
 [AC_MSG_CHECKING([for _sys_siglist declaration])
 AC_CACHE_VAL(ac_cv_decl__sys_siglist,
 [AC_TRY_COMPILE([#include <sys/types.h>
 #include <signal.h>
 /* Somebody might declare _sys_siglist in unistd.h.  */
 #ifdef HAVE_UNISTD_H
 #include <unistd.h>
 #endif], [char *msg = *(_sys_siglist + 1);],
   ac_cv_decl__sys_siglist=yes, ac_cv_decl__sys_siglist=no)])dnl
 AC_MSG_RESULT($ac_cv_decl__sys_siglist)
 if test $ac_cv_decl__sys_siglist = yes; then
   AC_DEFINE(SYS_SIGLIST_DECLARED)
 fi
 ])

 dnl ### A macro to determine if the msghdr structure has a msg_control member.
 AC_DEFUN(AC_STRUCT_MSG_CONTROL,
 [AC_MSG_CHECKING(for msg_control in struct msghdr)
 AC_CACHE_VAL(ac_cv_struct_msg_control,
 [AC_TRY_COMPILE([#include <sys/types.h>
 #include <sys/socket.h>],
 [#undef msg_control
 struct msghdr m; m.msg_control;],
 ac_cv_struct_msg_control=yes,
 ac_cv_struct_msg_control=no)])
 AC_MSG_RESULT($ac_cv_struct_msg_control)
 if test "$ac_cv_struct_msg_control" = yes
 then
 	AC_DEFINE(HAVE_MSG_CONTROL)
 fi
 ])

 dnl ### A macro to determine whether stat64 is defined.
 AC_DEFUN(AC_STAT64,
 [AC_MSG_CHECKING(for stat64 in (asm|sys)/stat.h)
 AC_CACHE_VAL(ac_cv_type_stat64,
 [AC_TRY_COMPILE([#ifdef linux
 #include <asm/stat.h>
 #else
 #include <sys/stat.h>
 #endif],
 [struct stat64 st;],
 ac_cv_type_stat64=yes,
 ac_cv_type_stat64=no)])
 AC_MSG_RESULT($ac_cv_type_stat64)
 if test "$ac_cv_type_stat64" = yes
 then
 	AC_DEFINE(HAVE_STAT64)
 fi
 ])

 dnl ### A macro to determine whether we have long long
 AC_DEFUN(AC_LONG_LONG,
 [AC_MSG_CHECKING(for long long)
 AC_CACHE_VAL(ac_cv_type_long_long,
 [AC_TRY_COMPILE([],
 [long long x = 20;],
 ac_cv_type_long_long=yes,
 ac_cv_type_long_long=no)])
 AC_MSG_RESULT($ac_cv_type_long_long)
 if test "$ac_cv_type_long_long" = yes
 then
 	AC_DEFINE(HAVE_LONG_LONG)
 fi
 ])

 dnl ### A macro to determine if off_t is a long long
 AC_DEFUN(AC_OFF_T_IS_LONG_LONG,
 [AC_MSG_CHECKING(for long long off_t)
 AC_CACHE_VAL(ac_cv_have_long_long_off_t,
 [AC_TRY_RUN([#include <sys/types.h>
 main () {
 	if (sizeof (off_t) == sizeof (long long) &&
 	    sizeof (off_t) > sizeof (long))
 	    return 0;
 	return 1;
 }
 ],
 ac_cv_have_long_long_off_t=yes,
 ac_cv_have_long_long_off_t=no,
 [# Should try to guess here
 ac_cv_have_long_long_off_t=no
 ])])
 AC_MSG_RESULT($ac_cv_have_long_long_off_t)
 if test "$ac_cv_have_long_long_off_t" = yes
 then
 	AC_DEFINE(HAVE_LONG_LONG_OFF_T)
 fi
 ])

 dnl ### A macro to determine if rlim_t is a long long
 AC_DEFUN(AC_RLIM_T_IS_LONG_LONG,
 [AC_MSG_CHECKING(for long long rlim_t)
 AC_CACHE_VAL(ac_cv_have_long_long_rlim_t,
 [AC_TRY_RUN([#include <sys/types.h>
 #include <sys/time.h>
 #include <sys/resource.h>
 main () {
 	if (sizeof (rlim_t) == sizeof (long long) &&
 	    sizeof (rlim_t) > sizeof (long))
 	    return 0;
 	return 1;
 }
 ],
 ac_cv_have_long_long_rlim_t=yes,
 ac_cv_have_long_long_rlim_t=no,
 [# Should try to guess here
 ac_cv_have_long_long_rlim_t=no
 ])])
 AC_MSG_RESULT($ac_cv_have_long_long_rlim_t)
 if test "$ac_cv_have_long_long_rlim_t" = yes
 then
 	AC_DEFINE(HAVE_LONG_LONG_RLIM_T)
 fi
 ])

 dnl ### A macro to determine whether sin6_scope_id is available.
 AC_DEFUN(AC_SIN6_SCOPE_ID,
 [AC_MSG_CHECKING(for sin6_scope_id in sockaddr_in6)
 AC_CACHE_VAL(ac_cv_have_sin6_scope_id,
 [AC_TRY_COMPILE([#include <netinet/in.h>],
 [ struct sockaddr_in6 s; s.sin6_scope_id = 0; ],
 ac_cv_have_sin6_scope_id=yes,
 ac_cv_have_sin6_scope_id=no)])
 AC_MSG_RESULT($ac_cv_have_sin6_scope_id)
 if test "$ac_cv_have_sin6_scope_id" = "yes" ; then
        AC_DEFINE(HAVE_SIN6_SCOPE_ID)
 else
        AC_MSG_CHECKING(for sin6_scope_id in linux sockaddr_in6)
        AC_CACHE_VAL(ac_cv_have_sin6_scope_id_linux,
        [AC_TRY_COMPILE([#include <linux/in6.h>],
        [ struct sockaddr_in6 s; s.sin6_scope_id = 0; ],
        ac_cv_have_sin6_scope_id_linux=yes,
        ac_cv_have_sin6_scope_id_linux=no)])
        AC_MSG_RESULT($ac_cv_have_sin6_scope_id_linux)
        if test "$ac_cv_have_sin6_scope_id_linux" = "yes" ; then
                AC_DEFINE(HAVE_SIN6_SCOPE_ID)
                AC_DEFINE(HAVE_SIN6_SCOPE_ID_LINUX)
        fi
 fi
 ])

 dnl ### A macro to check for st_flags in struct stat
 AC_DEFUN(AC_ST_FLAGS,
 [AC_MSG_CHECKING(for st_flags in struct stat)
 AC_CACHE_VAL(ac_cv_have_st_flags,
 [AC_TRY_COMPILE([#include <sys/stat.h>],
 [struct stat buf;
 buf.st_flags = 0;],
 ac_cv_have_st_flags=yes,
 ac_cv_have_st_flags=no)])
 AC_MSG_RESULT($ac_cv_have_st_flags)
 if test "$ac_cv_have_st_flags" = yes
 then
 	AC_DEFINE(HAVE_ST_FLAGS)
 fi
 ])

 dnl ### A macro to check for st_aclcnt in struct stat
 AC_DEFUN(AC_ST_ACLCNT,
 [AC_MSG_CHECKING(for st_aclcnt in struct stat)
 AC_CACHE_VAL(ac_cv_have_st_aclcnt,
 [AC_TRY_COMPILE([#include <sys/stat.h>],
 [struct stat buf;
 buf.st_aclcnt = 0;],
 ac_cv_have_st_aclcnt=yes,
 ac_cv_have_st_aclcnt=no)])
 AC_MSG_RESULT($ac_cv_have_st_aclcnt)
 if test "$ac_cv_have_st_aclcnt" = yes
 then
 	AC_DEFINE(HAVE_ST_ACLCNT)
 fi
 ])

 dnl ### A macro to check for st_level in struct stat
 AC_DEFUN(AC_ST_LEVEL,
 [AC_MSG_CHECKING(for st_level in struct stat)
 AC_CACHE_VAL(ac_cv_have_st_level,
 [AC_TRY_COMPILE([#include <sys/stat.h>],
 [struct stat buf;
 buf.st_level = 0;],
 ac_cv_have_st_level=yes,
 ac_cv_have_st_level=no)])
 AC_MSG_RESULT($ac_cv_have_st_level)
 if test "$ac_cv_have_st_level" = yes
 then
 	AC_DEFINE(HAVE_ST_LEVEL)
 fi
 ])

 dnl ### A macro to check for st_fstype in struct stat
 AC_DEFUN(AC_ST_FSTYPE,
 [AC_MSG_CHECKING(for st_fstype in struct stat)
 AC_CACHE_VAL(ac_cv_have_st_fstype,
 [AC_TRY_COMPILE([#include <sys/stat.h>],
 [struct stat buf;
 buf.st_fstype[0] = 0;],
 ac_cv_have_st_fstype=yes,
 ac_cv_have_st_fstype=no)])
 AC_MSG_RESULT($ac_cv_have_st_fstype)
 if test "$ac_cv_have_st_fstype" = yes
 then
 	AC_DEFINE(HAVE_ST_FSTYPE)
 fi
 ])

 dnl ### A macro to check for st_gen in struct stat
 AC_DEFUN(AC_ST_GEN,
 [AC_MSG_CHECKING(for st_gen in struct stat)
 AC_CACHE_VAL(ac_cv_have_st_gen,
 [AC_TRY_COMPILE([#include <sys/stat.h>],
 [struct stat buf;
 buf.st_gen = 0;],
 ac_cv_have_st_gen=yes,
 ac_cv_have_st_gen=no)])
 AC_MSG_RESULT($ac_cv_have_st_gen)
 if test "$ac_cv_have_st_gen" = yes
 then
 	AC_DEFINE(HAVE_ST_GEN)
 fi
 ])

 dnl ### A macro to determine endianness of long long
 AC_DEFUN(AC_LITTLE_ENDIAN_LONG_LONG,
 [AC_MSG_CHECKING(for little endian long long)
 AC_CACHE_VAL(ac_cv_have_little_endian_long_long,
 [AC_TRY_RUN([
 int main () {
 	union {
 		long long ll;
 		long l [2];
 	} u;
 	u.ll = 0x12345678;
 	if (u.l[0] == 0x12345678)
 		return 0;
 	return 1;
 }
 ],
 ac_cv_have_little_endian_long_long=yes,
 ac_cv_have_little_endian_long_long=no,
 [# Should try to guess here
 ac_cv_have_little_endian_long_long=no
 ])])
 AC_MSG_RESULT($ac_cv_have_little_endian_long_long)
 if test "$ac_cv_have_little_endian_long_long" = yes
 then
 	AC_DEFINE(HAVE_LITTLE_ENDIAN_LONG_LONG)
 fi
 ])

 dnl ### A macro to determine if we have struct opthdr in sys/socket.h
 AC_DEFUN(AC_STRUCT_OPTHDR,
 [AC_MSG_CHECKING(for struct opthdr in sys/socket.h)
 AC_CACHE_VAL(ac_cv_struct_opthdr,
 [AC_TRY_COMPILE([#include <sys/socket.h>],
 [struct opthdr fred;
 &fred;],
 ac_cv_struct_opthdr=yes,
 ac_cv_struct_opthdr=no)])
 AC_MSG_RESULT($ac_cv_struct_opthdr)
 if test "$ac_cv_struct_opthdr" = yes
 then
 	AC_DEFINE(HAVE_OPTHDR)
 fi
 ])

 dnl ### A macro to determine if we have struct t_opthdr in sys/tiuser.h
 AC_DEFUN(AC_STRUCT_T_OPTHDR,
 [AC_MSG_CHECKING(for struct t_opthdr in sys/tiuser.h)
 AC_CACHE_VAL(ac_cv_struct_t_opthdr,
 [AC_TRY_COMPILE([#include <sys/tiuser.h>],
 [struct t_opthdr fred;
 &fred;],
 ac_cv_struct_t_opthdr=yes,
 ac_cv_struct_t_opthdr=no)])
 AC_MSG_RESULT($ac_cv_struct_t_opthdr)
 if test "$ac_cv_struct_t_opthdr" = yes
 then
 	AC_DEFINE(HAVE_T_OPTHDR)
 fi
 ])
	dnl ### A macro to find the include directory, useful for cross-compiling.
	AC_DEFUN(AC_INCLUDEDIR,
	[AC_REQUIRE([AC_PROG_AWK])dnl
	AC_SUBST(includedir)
	AC_MSG_CHECKING(for primary include directory)
	includedir=/usr/include
	if test -n "$GCC"
	then
	>conftest.c
	new_includedir=`
	$CC -v -E conftest.c 2>&1 \| $AWK '
	/^End of search list/ { print last; exit }
	{ last = [$]1 }
	'
	`
	rm -f conftest.c
	if test -n "$new_includedir" && test -d "$new_includedir"
	then
	includedir=$new_includedir
	fi
	fi
	AC_MSG_RESULT($includedir)
	])

	dnl ### A macro to automatically set different CC and HOSTCC if using gcc.
	define(AC_PROG_HOSTCC,
	[AC_SUBST(HOSTCC)dnl
	if test -z "$HOSTCC"
	then
	HOSTCC="$CC"
	if test -n "$GCC"
	then
	# Find out if gcc groks our host.
	worked=
	last=
	for i in $1
	do
	test "x$i" = "x$last" && continue
	last="$i"
	CC="$HOSTCC -b $i"
	AC_MSG_CHECKING([for working $CC])
	AC_TRY_LINK(,,
	worked=1
	break
	)
	AC_MSG_RESULT(no)
	done
	if test -z "$worked"
	then
	CC="$HOSTCC"
	else
	AC_MSG_RESULT(yes)
	fi
	fi
	fi
	])

	dnl ### A macro to set gcc warning flags.
	define(AC_WARNFLAGS,
	[AC_SUBST(WARNFLAGS)
	if test -z "$WARNFLAGS"
	then
	if test -n "$GCC"
	then
	# If we're using gcc we want warning flags.
	WARNFLAGS=-Wall
	fi
	fi
	])

	dnl ### A macro to determine if we have a "MP" type procfs
	AC_DEFUN(AC_MP_PROCFS,
	[AC_MSG_CHECKING(for MP procfs)
	AC_CACHE_VAL(ac_cv_mp_procfs,
	[AC_TRY_RUN([
	#include <stdio.h>
	#include <signal.h>
	#include <sys/procfs.h>

	main()
	{
	int pid;
	char proc[32];
	FILE *ctl;
	FILE *status;
	int cmd;
	struct pstatus pstatus;

	if ((pid = fork()) == 0) {
	pause();
	exit(0);
	}
	sprintf(proc, "/proc/%d/ctl", pid);
	if ((ctl = fopen(proc, "w")) == NULL)
	goto fail;
	sprintf(proc, "/proc/%d/status", pid);
	if ((status = fopen (proc, "r")) == NULL)
	goto fail;
	cmd = PCSTOP;
	if (write (fileno (ctl), &cmd, sizeof cmd) < 0)
	goto fail;
	if (read (fileno (status), &pstatus, sizeof pstatus) < 0)
	goto fail;
	kill(pid, SIGKILL);
	exit(0);
	fail:
	kill(pid, SIGKILL);
	exit(1);
	}
	],
	ac_cv_mp_procfs=yes,
	ac_cv_mp_procfs=no,
	[
	# Guess or punt.
	case "$host_os" in
	svr4.2\|svr5)
	ac_cv_mp_procfs=yes
	;;
	*)
	ac_cv_mp_procfs=no
	;;
	esac
	])])
	AC_MSG_RESULT($ac_cv_mp_procfs)
	if test "$ac_cv_mp_procfs" = yes
	then
	AC_DEFINE(HAVE_MP_PROCFS)
	fi
	])

	dnl ### A macro to determine if procfs is pollable.
	AC_DEFUN(AC_POLLABLE_PROCFS,
	[AC_MSG_CHECKING(for pollable procfs)
	AC_CACHE_VAL(ac_cv_pollable_procfs,
	[AC_TRY_RUN([
	#include <stdio.h>
	#include <signal.h>
	#include <sys/procfs.h>
	#include <sys/stropts.h>
	#include <poll.h>

	#ifdef HAVE_MP_PROCFS
	#define PIOCSTOP PCSTOP
	#define POLLWANT POLLWRNORM
	#define PROC "/proc/%d/ctl"
	#define PROC_MODE "w"
	int IOCTL (int fd, int cmd, int arg) {
	return write (fd, &cmd, sizeof cmd);
	}
	#else
	#define POLLWANT POLLPRI
	#define PROC "/proc/%d"
	#define PROC_MODE "r+"
	#define IOCTL ioctl
	#endif

	main()
	{
	int pid;
	char proc[32];
	FILE *pfp;
	struct pollfd pfd;

	if ((pid = fork()) == 0) {
	pause();
	exit(0);
	}
	sprintf(proc, PROC, pid);
	if ((pfp = fopen(proc, PROC_MODE)) == NULL)
	goto fail;
	if (IOCTL(fileno(pfp), PIOCSTOP, NULL) < 0)
	goto fail;
	pfd.fd = fileno(pfp);
	pfd.events = POLLWANT;
	if (poll(&pfd, 1, 0) < 0)
	goto fail;
	if (!(pfd.revents & POLLWANT))
	goto fail;
	kill(pid, SIGKILL);
	exit(0);
	fail:
	kill(pid, SIGKILL);
	exit(1);
	}
	],
	ac_cv_pollable_procfs=yes,
	ac_cv_pollable_procfs=no,
	[
	# Guess or punt.
	case "$host_os" in
	solaris2\|irix5\|svr4.2uw\|svr5)
	ac_cv_pollable_procfs=yes
	;;
	*)
	ac_cv_pollable_procfs=no
	;;
	esac
	])])
	AC_MSG_RESULT($ac_cv_pollable_procfs)
	if test "$ac_cv_pollable_procfs" = yes
	then
	AC_DEFINE(HAVE_POLLABLE_PROCFS)
	fi
	])

	dnl ### A macro to determine if the prstatus structure has a pr_syscall member.
	AC_DEFUN(AC_STRUCT_PR_SYSCALL,
	[AC_MSG_CHECKING(for pr_syscall in struct prstatus)
	AC_CACHE_VAL(ac_cv_struct_pr_syscall,
	[AC_TRY_COMPILE([#include <sys/procfs.h>],
	[#ifdef HAVE_MP_PROCFS
	pstatus_t s;
	s.pr_lwp.pr_syscall
	#else
	prstatus_t s;
	s.pr_syscall
	#endif],
	ac_cv_struct_pr_syscall=yes,
	ac_cv_struct_pr_syscall=no)])
	AC_MSG_RESULT($ac_cv_struct_pr_syscall)
	if test "$ac_cv_struct_pr_syscall" = yes
	then
	AC_DEFINE(HAVE_PR_SYSCALL)
	fi
	])

	dnl ### A macro to detect the presence of the sig_atomic_t in signal.h
	AC_DEFUN(AC_SIG_ATOMIC_T,
	[AC_MSG_CHECKING(for sig_atomic_t in signal.h)
	AC_CACHE_VAL(ac_cv_sig_atomic_t,
	[AC_TRY_COMPILE([#include <signal.h>],
	[sig_atomic_t x;],
	ac_cv_sig_atomic_t=yes,
	ac_cv_sig_atomic_t=no)])
	AC_MSG_RESULT($ac_cv_sig_atomic_t)
	if test "$ac_cv_sig_atomic_t" = yes
	then
	AC_DEFINE(HAVE_SIG_ATOMIC_T)
	fi
	])

	dnl ### A macro to detect the presence of the siginfo_t in signal.h
	AC_DEFUN(AC_SIGINFO_T,
	[AC_MSG_CHECKING(for siginfo_t in signal.h)
	AC_CACHE_VAL(ac_cv_siginfo_t,
	[AC_TRY_COMPILE([#include <signal.h>],
	[siginfo_t x;],
	ac_cv_siginfo_t=yes,
	ac_cv_siginfo_t=no)])
	AC_MSG_RESULT($ac_cv_siginfo_t)
	if test "$ac_cv_siginfo_t" = yes
	then
	AC_DEFINE(HAVE_SIGINFO_T)
	fi
	])

	dnl ### A macro to determine if sys_errlist is declared.
	AC_DEFUN(AC_DECL_SYS_ERRLIST,
	[AC_MSG_CHECKING([for sys_errlist declaration])
	AC_CACHE_VAL(ac_cv_decl_sys_errlist,
	[AC_TRY_COMPILE([#include <sys/types.h>
	#include <errno.h>
	#include <stdio.h>
	/* Somebody might declare sys_errlist in unistd.h. */
	#ifdef HAVE_UNISTD_H
	#include <unistd.h>
	#endif], [char msg = (sys_errlist + 1);],
	ac_cv_decl_sys_errlist=yes, ac_cv_decl_sys_errlist=no)])dnl
	AC_MSG_RESULT($ac_cv_decl_sys_errlist)
	if test $ac_cv_decl_sys_errlist = yes; then
	AC_DEFINE(SYS_ERRLIST_DECLARED)
	fi
	])

	dnl ### A macro to determine if _sys_siglist is declared.
	AC_DEFUN(AC_DECL__SYS_SIGLIST,
	[AC_MSG_CHECKING([for _sys_siglist declaration])
	AC_CACHE_VAL(ac_cv_decl__sys_siglist,
	[AC_TRY_COMPILE([#include <sys/types.h>
	#include <signal.h>
	/* Somebody might declare _sys_siglist in unistd.h. */
	#ifdef HAVE_UNISTD_H
	#include <unistd.h>
	#endif], [char msg = (_sys_siglist + 1);],
	ac_cv_decl__sys_siglist=yes, ac_cv_decl__sys_siglist=no)])dnl
	AC_MSG_RESULT($ac_cv_decl__sys_siglist)
	if test $ac_cv_decl__sys_siglist = yes; then
	AC_DEFINE(SYS_SIGLIST_DECLARED)
	fi
	])

	dnl ### A macro to determine if the msghdr structure has a msg_control member.
	AC_DEFUN(AC_STRUCT_MSG_CONTROL,
	[AC_MSG_CHECKING(for msg_control in struct msghdr)
	AC_CACHE_VAL(ac_cv_struct_msg_control,
	[AC_TRY_COMPILE([#include <sys/types.h>
	#include <sys/socket.h>],
	[#undef msg_control
	struct msghdr m; m.msg_control;],
	ac_cv_struct_msg_control=yes,
	ac_cv_struct_msg_control=no)])
	AC_MSG_RESULT($ac_cv_struct_msg_control)
	if test "$ac_cv_struct_msg_control" = yes
	then
	AC_DEFINE(HAVE_MSG_CONTROL)
	fi
	])

	dnl ### A macro to determine whether stat64 is defined.
	AC_DEFUN(AC_STAT64,
	[AC_MSG_CHECKING(for stat64 in (asm\|sys)/stat.h)
	AC_CACHE_VAL(ac_cv_type_stat64,
	[AC_TRY_COMPILE([#ifdef linux
	#include <asm/stat.h>
	#else
	#include <sys/stat.h>
	#endif],
	[struct stat64 st;],
	ac_cv_type_stat64=yes,
	ac_cv_type_stat64=no)])
	AC_MSG_RESULT($ac_cv_type_stat64)
	if test "$ac_cv_type_stat64" = yes
	then
	AC_DEFINE(HAVE_STAT64)
	fi
	])

	dnl ### A macro to determine whether we have long long
	AC_DEFUN(AC_LONG_LONG,
	[AC_MSG_CHECKING(for long long)
	AC_CACHE_VAL(ac_cv_type_long_long,
	[AC_TRY_COMPILE([],
	[long long x = 20;],
	ac_cv_type_long_long=yes,
	ac_cv_type_long_long=no)])
	AC_MSG_RESULT($ac_cv_type_long_long)
	if test "$ac_cv_type_long_long" = yes
	then
	AC_DEFINE(HAVE_LONG_LONG)
	fi
	])

	dnl ### A macro to determine if off_t is a long long
	AC_DEFUN(AC_OFF_T_IS_LONG_LONG,
	[AC_MSG_CHECKING(for long long off_t)
	AC_CACHE_VAL(ac_cv_have_long_long_off_t,
	[AC_TRY_RUN([#include <sys/types.h>
	main () {
	if (sizeof (off_t) == sizeof (long long) &&
	sizeof (off_t) > sizeof (long))
	return 0;
	return 1;
	}
	],
	ac_cv_have_long_long_off_t=yes,
	ac_cv_have_long_long_off_t=no,
	[# Should try to guess here
	ac_cv_have_long_long_off_t=no
	])])
	AC_MSG_RESULT($ac_cv_have_long_long_off_t)
	if test "$ac_cv_have_long_long_off_t" = yes
	then
	AC_DEFINE(HAVE_LONG_LONG_OFF_T)
	fi
	])

	dnl ### A macro to determine if rlim_t is a long long
	AC_DEFUN(AC_RLIM_T_IS_LONG_LONG,
	[AC_MSG_CHECKING(for long long rlim_t)
	AC_CACHE_VAL(ac_cv_have_long_long_rlim_t,
	[AC_TRY_RUN([#include <sys/types.h>
	#include <sys/time.h>
	#include <sys/resource.h>
	main () {
	if (sizeof (rlim_t) == sizeof (long long) &&
	sizeof (rlim_t) > sizeof (long))
	return 0;
	return 1;
	}
	],
	ac_cv_have_long_long_rlim_t=yes,
	ac_cv_have_long_long_rlim_t=no,
	[# Should try to guess here
	ac_cv_have_long_long_rlim_t=no
	])])
	AC_MSG_RESULT($ac_cv_have_long_long_rlim_t)
	if test "$ac_cv_have_long_long_rlim_t" = yes
	then
	AC_DEFINE(HAVE_LONG_LONG_RLIM_T)
	fi
	])

	dnl ### A macro to determine whether sin6_scope_id is available.
	AC_DEFUN(AC_SIN6_SCOPE_ID,
	[AC_MSG_CHECKING(for sin6_scope_id in sockaddr_in6)
	AC_CACHE_VAL(ac_cv_have_sin6_scope_id,
	[AC_TRY_COMPILE([#include <netinet/in.h>],
	[ struct sockaddr_in6 s; s.sin6_scope_id = 0; ],
	ac_cv_have_sin6_scope_id=yes,
	ac_cv_have_sin6_scope_id=no)])
	AC_MSG_RESULT($ac_cv_have_sin6_scope_id)
	if test "$ac_cv_have_sin6_scope_id" = "yes" ; then
	AC_DEFINE(HAVE_SIN6_SCOPE_ID)
	else
	AC_MSG_CHECKING(for sin6_scope_id in linux sockaddr_in6)
	AC_CACHE_VAL(ac_cv_have_sin6_scope_id_linux,
	[AC_TRY_COMPILE([#include <linux/in6.h>],
	[ struct sockaddr_in6 s; s.sin6_scope_id = 0; ],
	ac_cv_have_sin6_scope_id_linux=yes,
	ac_cv_have_sin6_scope_id_linux=no)])
	AC_MSG_RESULT($ac_cv_have_sin6_scope_id_linux)
	if test "$ac_cv_have_sin6_scope_id_linux" = "yes" ; then
	AC_DEFINE(HAVE_SIN6_SCOPE_ID)
	AC_DEFINE(HAVE_SIN6_SCOPE_ID_LINUX)
	fi
	fi
	])

	dnl ### A macro to check for st_flags in struct stat
	AC_DEFUN(AC_ST_FLAGS,
	[AC_MSG_CHECKING(for st_flags in struct stat)
	AC_CACHE_VAL(ac_cv_have_st_flags,
	[AC_TRY_COMPILE([#include <sys/stat.h>],
	[struct stat buf;
	buf.st_flags = 0;],
	ac_cv_have_st_flags=yes,
	ac_cv_have_st_flags=no)])
	AC_MSG_RESULT($ac_cv_have_st_flags)
	if test "$ac_cv_have_st_flags" = yes
	then
	AC_DEFINE(HAVE_ST_FLAGS)
	fi
	])

	dnl ### A macro to check for st_aclcnt in struct stat
	AC_DEFUN(AC_ST_ACLCNT,
	[AC_MSG_CHECKING(for st_aclcnt in struct stat)
	AC_CACHE_VAL(ac_cv_have_st_aclcnt,
	[AC_TRY_COMPILE([#include <sys/stat.h>],
	[struct stat buf;
	buf.st_aclcnt = 0;],
	ac_cv_have_st_aclcnt=yes,
	ac_cv_have_st_aclcnt=no)])
	AC_MSG_RESULT($ac_cv_have_st_aclcnt)
	if test "$ac_cv_have_st_aclcnt" = yes
	then
	AC_DEFINE(HAVE_ST_ACLCNT)
	fi
	])

	dnl ### A macro to check for st_level in struct stat
	AC_DEFUN(AC_ST_LEVEL,
	[AC_MSG_CHECKING(for st_level in struct stat)
	AC_CACHE_VAL(ac_cv_have_st_level,
	[AC_TRY_COMPILE([#include <sys/stat.h>],
	[struct stat buf;
	buf.st_level = 0;],
	ac_cv_have_st_level=yes,
	ac_cv_have_st_level=no)])
	AC_MSG_RESULT($ac_cv_have_st_level)
	if test "$ac_cv_have_st_level" = yes
	then
	AC_DEFINE(HAVE_ST_LEVEL)
	fi
	])

	dnl ### A macro to check for st_fstype in struct stat
	AC_DEFUN(AC_ST_FSTYPE,
	[AC_MSG_CHECKING(for st_fstype in struct stat)
	AC_CACHE_VAL(ac_cv_have_st_fstype,
	[AC_TRY_COMPILE([#include <sys/stat.h>],
	[struct stat buf;
	buf.st_fstype[0] = 0;],
	ac_cv_have_st_fstype=yes,
	ac_cv_have_st_fstype=no)])
	AC_MSG_RESULT($ac_cv_have_st_fstype)
	if test "$ac_cv_have_st_fstype" = yes
	then
	AC_DEFINE(HAVE_ST_FSTYPE)
	fi
	])

	dnl ### A macro to check for st_gen in struct stat
	AC_DEFUN(AC_ST_GEN,
	[AC_MSG_CHECKING(for st_gen in struct stat)
	AC_CACHE_VAL(ac_cv_have_st_gen,
	[AC_TRY_COMPILE([#include <sys/stat.h>],
	[struct stat buf;
	buf.st_gen = 0;],
	ac_cv_have_st_gen=yes,
	ac_cv_have_st_gen=no)])
	AC_MSG_RESULT($ac_cv_have_st_gen)
	if test "$ac_cv_have_st_gen" = yes
	then
	AC_DEFINE(HAVE_ST_GEN)
	fi
	])

	dnl ### A macro to determine endianness of long long
	AC_DEFUN(AC_LITTLE_ENDIAN_LONG_LONG,
	[AC_MSG_CHECKING(for little endian long long)
	AC_CACHE_VAL(ac_cv_have_little_endian_long_long,
	[AC_TRY_RUN([
	int main () {
	union {
	long long ll;
	long l [2];
	} u;
	u.ll = 0x12345678;
	if (u.l[0] == 0x12345678)
	return 0;
	return 1;
	}
	],
	ac_cv_have_little_endian_long_long=yes,
	ac_cv_have_little_endian_long_long=no,
	[# Should try to guess here
	ac_cv_have_little_endian_long_long=no
	])])
	AC_MSG_RESULT($ac_cv_have_little_endian_long_long)
	if test "$ac_cv_have_little_endian_long_long" = yes
	then
	AC_DEFINE(HAVE_LITTLE_ENDIAN_LONG_LONG)
	fi
	])

	dnl ### A macro to determine if we have struct opthdr in sys/socket.h
	AC_DEFUN(AC_STRUCT_OPTHDR,
	[AC_MSG_CHECKING(for struct opthdr in sys/socket.h)
	AC_CACHE_VAL(ac_cv_struct_opthdr,
	[AC_TRY_COMPILE([#include <sys/socket.h>],
	[struct opthdr fred;
	&fred;],
	ac_cv_struct_opthdr=yes,
	ac_cv_struct_opthdr=no)])
	AC_MSG_RESULT($ac_cv_struct_opthdr)
	if test "$ac_cv_struct_opthdr" = yes
	then
	AC_DEFINE(HAVE_OPTHDR)
	fi
	])

	dnl ### A macro to determine if we have struct t_opthdr in sys/tiuser.h
	AC_DEFUN(AC_STRUCT_T_OPTHDR,
	[AC_MSG_CHECKING(for struct t_opthdr in sys/tiuser.h)
	AC_CACHE_VAL(ac_cv_struct_t_opthdr,
	[AC_TRY_COMPILE([#include <sys/tiuser.h>],
	[struct t_opthdr fred;
	&fred;],
	ac_cv_struct_t_opthdr=yes,
	ac_cv_struct_t_opthdr=no)])
	AC_MSG_RESULT($ac_cv_struct_t_opthdr)
	if test "$ac_cv_struct_t_opthdr" = yes
	then
	AC_DEFINE(HAVE_T_OPTHDR)
	fi
	])