acspecific.m4

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	 || status

	 /* Did the vfork/compiler bug occur?  */
	 || parent != getpid()

	 /* Did the file descriptor bug occur?  */
	 || fstat(fileno(stdout), &st) != 0
	 );
  }
}],
ac_cv_func_vfork_works=yes, ac_cv_func_vfork_works=no, AC_CHECK_FUNC(vfork)
ac_cv_func_vfork_works=$ac_cv_func_vfork)])
if test $ac_cv_func_vfork_works = no; then
  AC_DEFINE(vfork, fork)
fi
])

AC_DEFUN(AC_FUNC_WAIT3,
[AC_CACHE_CHECK(for wait3 that fills in rusage, ac_cv_func_wait3_rusage,
[AC_TRY_RUN([#include <sys/types.h>
#include <sys/time.h>
#include <sys/resource.h>
#include <stdio.h>
/* HP-UX has wait3 but does not fill in rusage at all.  */
main() {
  struct rusage r;
  int i;
  /* Use a field that we can force nonzero --
     voluntary context switches.
     For systems like NeXT and OSF/1 that don't set it,
     also use the system CPU time.  And page faults (I/O) for Linux.  */
  r.ru_nvcsw = 0;
  r.ru_stime.tv_sec = 0;
  r.ru_stime.tv_usec = 0;
  r.ru_majflt = r.ru_minflt = 0;
  switch (fork()) {
  case 0: /* Child.  */
    sleep(1); /* Give up the CPU.  */
    _exit(0);
  case -1: _exit(0); /* What can we do?  */
  default: /* Parent.  */
    wait3(&i, 0, &r);
    sleep(2); /* Avoid "text file busy" from rm on fast HP-UX machines.  */
    exit(r.ru_nvcsw == 0 && r.ru_majflt == 0 && r.ru_minflt == 0
	 && r.ru_stime.tv_sec == 0 && r.ru_stime.tv_usec == 0);
  }
}], ac_cv_func_wait3_rusage=yes, ac_cv_func_wait3_rusage=no,
ac_cv_func_wait3_rusage=no)])
if test $ac_cv_func_wait3_rusage = yes; then
  AC_DEFINE(HAVE_WAIT3)
fi
])

AC_DEFUN(AC_FUNC_ALLOCA,
[AC_REQUIRE_CPP()dnl Set CPP; we run AC_EGREP_CPP conditionally.
# The Ultrix 4.2 mips builtin alloca declared by alloca.h only works
# for constant arguments.  Useless!
AC_CACHE_CHECK([for working alloca.h], ac_cv_header_alloca_h,
[AC_TRY_LINK([#include <alloca.h>], [char *p = alloca(2 * sizeof(int));],
  ac_cv_header_alloca_h=yes, ac_cv_header_alloca_h=no)])
if test $ac_cv_header_alloca_h = yes; then
  AC_DEFINE(HAVE_ALLOCA_H)
fi

AC_CACHE_CHECK([for alloca], ac_cv_func_alloca_works,
[AC_TRY_LINK([
#ifdef __GNUC__
# define alloca __builtin_alloca
#else
# ifdef _MSC_VER
#  include <malloc.h>
#  define alloca _alloca
# else
#  if HAVE_ALLOCA_H
#   include <alloca.h>
#  else
#   ifdef _AIX
 #pragma alloca
#   else
#    ifndef alloca /* predefined by HP cc +Olibcalls */
char *alloca ();
#    endif
#   endif
#  endif
# endif
#endif
], [char *p = (char *) alloca(1);],
  ac_cv_func_alloca_works=yes, ac_cv_func_alloca_works=no)])
if test $ac_cv_func_alloca_works = yes; then
  AC_DEFINE(HAVE_ALLOCA)
fi

if test $ac_cv_func_alloca_works = no; then
  # The SVR3 libPW and SVR4 libucb both contain incompatible functions
  # that cause trouble.  Some versions do not even contain alloca or
  # contain a buggy version.  If you still want to use their alloca,
  # use ar to extract alloca.o from them instead of compiling alloca.c.
  ALLOCA=alloca.${ac_objext}
  AC_DEFINE(C_ALLOCA)

AC_CACHE_CHECK(whether alloca needs Cray hooks, ac_cv_os_cray,
[AC_EGREP_CPP(webecray,
[#if defined(CRAY) && ! defined(CRAY2)
webecray
#else
wenotbecray
#endif
], ac_cv_os_cray=yes, ac_cv_os_cray=no)])
if test $ac_cv_os_cray = yes; then
for ac_func in _getb67 GETB67 getb67; do
  AC_CHECK_FUNC($ac_func, [AC_DEFINE_UNQUOTED(CRAY_STACKSEG_END, $ac_func)
  break])
done
fi

AC_CACHE_CHECK(stack direction for C alloca, ac_cv_c_stack_direction,
[AC_TRY_RUN([find_stack_direction ()
{
  static char *addr = 0;
  auto char dummy;
  if (addr == 0)
    {
      addr = &dummy;
      return find_stack_direction ();
    }
  else
    return (&dummy > addr) ? 1 : -1;
}
main ()
{
  exit (find_stack_direction() < 0);
}], ac_cv_c_stack_direction=1, ac_cv_c_stack_direction=-1,
  ac_cv_c_stack_direction=0)])
AC_DEFINE_UNQUOTED(STACK_DIRECTION, $ac_cv_c_stack_direction)
fi
AC_SUBST(ALLOCA)dnl
])

AC_DEFUN(AC_FUNC_GETLOADAVG,
[ac_have_func=no # yes means we've found a way to get the load average.

# Some systems with -lutil have (and need) -lkvm as well, some do not.
# On Solaris, -lkvm requires nlist from -lelf, so check that first
# to get the right answer into the cache.
AC_CHECK_LIB(elf, elf_begin, LIBS="-lelf $LIBS")
AC_CHECK_LIB(kvm, kvm_open, LIBS="-lkvm $LIBS")
# Check for the 4.4BSD definition of getloadavg.
AC_CHECK_LIB(util, getloadavg,
  [LIBS="-lutil $LIBS" ac_have_func=yes ac_cv_func_getloadavg_setgid=yes])

if test $ac_have_func = no; then
  # There is a commonly available library for RS/6000 AIX.
  # Since it is not a standard part of AIX, it might be installed locally.
  ac_getloadavg_LIBS="$LIBS"; LIBS="-L/usr/local/lib $LIBS"
  AC_CHECK_LIB(getloadavg, getloadavg,
    LIBS="-lgetloadavg $LIBS", LIBS="$ac_getloadavg_LIBS")
fi

# Make sure it is really in the library, if we think we found it.
AC_REPLACE_FUNCS(getloadavg)

if test $ac_cv_func_getloadavg = yes; then
  AC_DEFINE(HAVE_GETLOADAVG)
  ac_have_func=yes
else
  # Figure out what our getloadavg.c needs.
  ac_have_func=no
  AC_CHECK_HEADER(sys/dg_sys_info.h,
  [ac_have_func=yes; AC_DEFINE(DGUX)
  AC_CHECK_LIB(dgc, dg_sys_info)])

  # We cannot check for <dwarf.h>, because Solaris 2 does not use dwarf (it
  # uses stabs), but it is still SVR4.  We cannot check for <elf.h> because
  # Irix 4.0.5F has the header but not the library.
  if test $ac_have_func = no && test $ac_cv_lib_elf_elf_begin = yes; then
    ac_have_func=yes; AC_DEFINE(SVR4)
  fi

  if test $ac_have_func = no; then
    AC_CHECK_HEADER(inq_stats/cpustats.h,
    [ac_have_func=yes; AC_DEFINE(UMAX)
    AC_DEFINE(UMAX4_3)])
  fi

  if test $ac_have_func = no; then
    AC_CHECK_HEADER(sys/cpustats.h,
    [ac_have_func=yes; AC_DEFINE(UMAX)])
  fi

  if test $ac_have_func = no; then
    AC_CHECK_HEADERS(mach/mach.h)
  fi

  AC_CHECK_HEADER(nlist.h,
  [AC_DEFINE(NLIST_STRUCT)
  AC_CACHE_CHECK([for n_un in struct nlist], ac_cv_struct_nlist_n_un,
  [AC_TRY_COMPILE([#include <nlist.h>],
  [struct nlist n; n.n_un.n_name = 0;],
  ac_cv_struct_nlist_n_un=yes, ac_cv_struct_nlist_n_un=no)])
  if test $ac_cv_struct_nlist_n_un = yes; then
    AC_DEFINE(NLIST_NAME_UNION)
  fi
  ])dnl
fi # Do not have getloadavg in system libraries.

# Some definitions of getloadavg require that the program be installed setgid.
dnl FIXME Don't hardwire the path of getloadavg.c in the top-level directory.
AC_CACHE_CHECK(whether getloadavg requires setgid,
  ac_cv_func_getloadavg_setgid,
[AC_EGREP_CPP([Yowza Am I SETGID yet],
[#include "$srcdir/getloadavg.c"
#ifdef LDAV_PRIVILEGED
Yowza Am I SETGID yet
#endif],
  ac_cv_func_getloadavg_setgid=yes, ac_cv_func_getloadavg_setgid=no)])
if test $ac_cv_func_getloadavg_setgid = yes; then
  NEED_SETGID=true; AC_DEFINE(GETLOADAVG_PRIVILEGED)
else
  NEED_SETGID=false
fi
AC_SUBST(NEED_SETGID)dnl

if test $ac_cv_func_getloadavg_setgid = yes; then
  AC_CACHE_CHECK(group of /dev/kmem, ac_cv_group_kmem,
[changequote(, )dnl
  # On Solaris, /dev/kmem is a symlink.  Get info on the real file.
  ac_ls_output=`ls -lgL /dev/kmem 2>/dev/null`
  # If we got an error (system does not support symlinks), try without -L.
  test -z "$ac_ls_output" && ac_ls_output=`ls -lg /dev/kmem`
  ac_cv_group_kmem=`echo $ac_ls_output \
    | sed -ne 's/[ 	][ 	]*/ /g;
	       s/^.[sSrwx-]* *[0-9]* *\([^0-9]*\)  *.*/\1/;
	       / /s/.* //;p;'`
changequote([, ])dnl
])
  KMEM_GROUP=$ac_cv_group_kmem
fi
AC_SUBST(KMEM_GROUP)dnl
])

AC_DEFUN(AC_FUNC_UTIME_NULL,
[AC_CACHE_CHECK(whether utime accepts a null argument, ac_cv_func_utime_null,
[rm -f conftestdata; > conftestdata
# Sequent interprets utime(file, 0) to mean use start of epoch.  Wrong.
AC_TRY_RUN([#include <sys/types.h>
#include <sys/stat.h>
main() {
struct stat s, t;
exit(!(stat ("conftestdata", &s) == 0 && utime("conftestdata", (long *)0) == 0
&& stat("conftestdata", &t) == 0 && t.st_mtime >= s.st_mtime
&& t.st_mtime - s.st_mtime < 120));
}], ac_cv_func_utime_null=yes, ac_cv_func_utime_null=no,
  ac_cv_func_utime_null=no)
rm -f core core.* *.core])
if test $ac_cv_func_utime_null = yes; then
  AC_DEFINE(HAVE_UTIME_NULL)
fi
])

AC_DEFUN(AC_FUNC_STRCOLL,
[AC_CACHE_CHECK(for working strcoll, ac_cv_func_strcoll_works,
[AC_TRY_RUN([#include <string.h>
main ()
{
  exit (strcoll ("abc", "def") >= 0 ||
	strcoll ("ABC", "DEF") >= 0 ||
	strcoll ("123", "456") >= 0);
}], ac_cv_func_strcoll_works=yes, ac_cv_func_strcoll_works=no,
ac_cv_func_strcoll_works=no)])
if test $ac_cv_func_strcoll_works = yes; then
  AC_DEFINE(HAVE_STRCOLL)
fi
])

AC_DEFUN(AC_FUNC_SETVBUF_REVERSED,
[AC_CACHE_CHECK(whether setvbuf arguments are reversed,
  ac_cv_func_setvbuf_reversed,
[AC_TRY_RUN([#include <stdio.h>
/* If setvbuf has the reversed format, exit 0. */
main () {
  /* This call has the arguments reversed.
     A reversed system may check and see that the address of main
     is not _IOLBF, _IONBF, or _IOFBF, and return nonzero.  */
  if (setvbuf(stdout, _IOLBF, (char *) main, BUFSIZ) != 0)
    exit(1);
  putc('\r', stdout);
  exit(0);			/* Non-reversed systems segv here.  */
}], ac_cv_func_setvbuf_reversed=yes, ac_cv_func_setvbuf_reversed=no)
rm -f core core.* *.core])
if test $ac_cv_func_setvbuf_reversed = yes; then
  AC_DEFINE(SETVBUF_REVERSED)
fi
])

AC_DEFUN(AC_FUNC_GETMNTENT,
[# getmntent is in -lsun on Irix 4, -lseq on Dynix/PTX, -lgen on Unixware.
AC_CHECK_LIB(sun, getmntent, LIBS="-lsun $LIBS",
  [AC_CHECK_LIB(seq, getmntent, LIBS="-lseq $LIBS",
    [AC_CHECK_LIB(gen, getmntent, LIBS="-lgen $LIBS")])])
AC_CHECK_FUNC(getmntent, [AC_DEFINE(HAVE_GETMNTENT)])])

AC_DEFUN(AC_FUNC_STRFTIME,
[AC_CHECK_FUNC(strftime, [AC_DEFINE(HAVE_STRFTIME)],
[# strftime is in -lintl on SCO UNIX.
AC_CHECK_LIB(intl, strftime, 
[AC_DEFINE(HAVE_STRFTIME)
LIBS="-lintl $LIBS"])])])

AC_DEFUN(AC_FUNC_MEMCMP,
[AC_CACHE_CHECK(for 8-bit clean memcmp, ac_cv_func_memcmp_clean,
[AC_TRY_RUN([
main()
{
  char c0 = 0x40, c1 = 0x80, c2 = 0x81;
  exit(memcmp(&c0, &c2, 1) < 0 && memcmp(&c1, &c2, 1) < 0 ? 0 : 1);
}
], ac_cv_func_memcmp_clean=yes, ac_cv_func_memcmp_clean=no,
ac_cv_func_memcmp_clean=no)])
test $ac_cv_func_memcmp_clean = no && LIBOBJS="$LIBOBJS memcmp.${ac_objext}"
AC_SUBST(LIBOBJS)dnl
])

AC_DEFUN(AC_FUNC_SELECT_ARGTYPES,
[AC_MSG_CHECKING([types of arguments for select()])
 AC_CACHE_VAL(ac_cv_func_select_arg234,dnl
 [AC_CACHE_VAL(ac_cv_func_select_arg1,dnl
  [AC_CACHE_VAL(ac_cv_func_select_arg5,dnl
   [for ac_cv_func_select_arg234 in 'fd_set *' 'int *' 'void *'; do
     for ac_cv_func_select_arg1 in 'int' 'size_t' 'unsigned long' 'unsigned'; do
      for ac_cv_func_select_arg5 in 'struct timeval *' 'const struct timeval *'; do
       AC_TRY_COMPILE(dnl
[#ifdef HAVE_SYS_TYPES_H
#include <sys/types.h>
#endif
#ifdef HAVE_SYS_TIME_H
#include <sys/time.h>
#endif
#ifdef HAVE_SYS_SELECT_H
#include <sys/select.h>
#endif
#ifdef HAVE_SYS_SOCKET_H
#include <sys/socket.h>
#endif
extern select ($ac_cv_func_select_arg1,$ac_cv_func_select_arg234,$ac_cv_func_select_arg234,$ac_cv_func_select_arg234,$ac_cv_func_select_arg5);],,dnl
        [ac_not_found=no ; break 3],ac_not_found=yes)
      done
     done
    done
   ])dnl AC_CACHE_VAL
  ])dnl AC_CACHE_VAL
 ])dnl AC_CACHE_VAL
 if test "$ac_not_found" = yes; then
  ac_cv_func_select_arg1=int 
  ac_cv_func_select_arg234='int *' 
  ac_cv_func_select_arg5='struct timeval *'
 fi
 AC_MSG_RESULT([$ac_cv_func_select_arg1,$ac_cv_func_select_arg234,$ac_cv_func_select_arg5])
 AC_DEFINE_UNQUOTED(SELECT_TYPE_ARG1,$ac_cv_func_select_arg1)
 AC_DEFINE_UNQUOTED(SELECT_TYPE_ARG234,($ac_cv_func_select_arg234))
 AC_DEFINE_UNQUOTED(SELECT_TYPE_ARG5,($ac_cv_func_select_arg5))
])


dnl ### Checks for structure members


AC_DEFUN(AC_HEADER_TIME,
[AC_CACHE_CHECK([whether time.h and sys/time.h may both be included],
  ac_cv_header_time,
[AC_TRY_COMPILE([#include <sys/types.h>
#include <sys/time.h>
#include <time.h>],
[struct tm *tp;], ac_cv_header_time=yes, ac_cv_header_time=no)])
if test $ac_cv_header_time = yes; then
  AC_DEFINE(TIME_WITH_SYS_TIME)
fi
])

AC_DEFUN(AC_STRUCT_TM,
[AC_CACHE_CHECK([whether struct tm is in sys/time.h or time.h],
  ac_cv_struct_tm,
[AC_TRY_COMPILE([#include <sys/types.h>
#include <time.h>],
[struct tm *tp; tp->tm_sec;],
  ac_cv_struct_tm=time.h, ac_cv_struct_tm=sys/time.h)])
if test $ac_cv_struct_tm = sys/time.h; then
  AC_DEFINE(TM_IN_SYS_TIME)
fi
])

AC_DEFUN(AC_STRUCT_TIMEZONE,
[AC_REQUIRE([AC_STRUCT_TM])dnl
AC_CACHE_CHECK([for tm_zone in struct tm], ac_cv_struct_tm_zone,
[AC_TRY_COMPILE([#include <sys/types.h>
#include <$ac_cv_struct_tm>], [struct tm tm; tm.tm_zone;],
  ac_cv_struct_tm_zone=yes, ac_cv_struct_tm_zone=no)])
if test "$ac_cv_struct_tm_zone" = yes; then
  AC_DEFINE(HAVE_TM_ZONE)
else
  AC_CACHE_CHECK(for tzname, ac_cv_var_tzname,
[AC_TRY_LINK(
changequote(<<, >>)dnl
<<#include <time.h>
#ifndef tzname /* For SGI.  */
extern char *tzname[]; /* RS6000 and others reject char **tzname.  */
#endif>>,
changequote([, ])dnl
[atoi(*tzname);], ac_cv_var_tzname=yes, ac_cv_var_tzname=no)])
  if test $ac_cv_var_tzname = yes; then
    AC_DEFINE(HAVE_TZNAME)
  fi
fi
])

AC_DEFUN(AC_STRUCT_ST_BLOCKS,
[AC_CACHE_CHECK([for st_blocks in struct stat], ac_cv_struct_st_blocks,
[AC_TRY_COMPILE([#include <sys/types.h>
#include <sys/stat.h>], [struct stat s; s.st_blocks;],
ac_cv_struct_st_blocks=yes, ac_cv_struct_st_blocks=no)])
if test $ac_cv_struct_st_blocks = yes; then
  AC_DEFINE(HAVE_ST_BLOCKS)
else
  LIBOBJS="$LIBOBJS fileblocks.${ac_objext}"
fi
AC_SUBST(LIBOBJS)dnl
])

AC_DEFUN(AC_STRUCT_ST_BLKSIZE,
[AC_CACHE_CHECK([for st_blksize in struct stat], ac_cv_struct_st_blksize,
[AC_TRY_COMPILE([#include <sys/types.h>
#include <sys/stat.h>], [struct stat s; s.st_blksize;],
ac_cv_struct_st_blksize=yes, ac_cv_struct_st_blksize=no)])
if test $ac_cv_struct_st_blksize = yes; then
  AC_DEFINE(HAVE_ST_BLKSIZE)
fi
])

AC_DEFUN(AC_STRUCT_ST_RDEV,
[AC_CACHE_CHECK([for st_rdev in struct stat], ac_cv_struct_st_rdev,
[AC_TRY_COMPILE([#include <sys/types.h>
#include <sys/stat.h>], [struct stat s; s.st_rdev;],
ac_cv_struct_st_rdev=yes, ac_cv_struct_st_rdev=no)])
if test $ac_cv_struct_st_rdev = yes; then
  AC_DEFINE(HAVE_ST_RDEV)
fi
])