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autoconf/acfunctions.m4
Akim Demaille 4b6e36a5f7 * acfunctions.m4 (AC_FUNC_GETLOADAVG): Restore the initial value 
of LIBS.  Otherwise, everyone ends up linking with -lelf for some
configurations.
Reported by Mike Stone.
2000-09-18 10:53:01 +00:00

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# This file is part of Autoconf. -*- Autoconf -*-
# Checking for functions.
# Copyright (C) 2000
# Free Software Foundation, Inc.
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2, or (at your option)
# any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
# 02111-1307, USA.
#
# As a special exception, the Free Software Foundation gives unlimited
# permission to copy, distribute and modify the configure scripts that
# are the output of Autoconf. You need not follow the terms of the GNU
# General Public License when using or distributing such scripts, even
# though portions of the text of Autoconf appear in them. The GNU
# General Public License (GPL) does govern all other use of the material
# that constitutes the Autoconf program.
#
# Certain portions of the Autoconf source text are designed to be copied
# (in certain cases, depending on the input) into the output of
# Autoconf. We call these the "data" portions. The rest of the Autoconf
# source text consists of comments plus executable code that decides which
# of the data portions to output in any given case. We call these
# comments and executable code the "non-data" portions. Autoconf never
# copies any of the non-data portions into its output.
#
# This special exception to the GPL applies to versions of Autoconf
# released by the Free Software Foundation. When you make and
# distribute a modified version of Autoconf, you may extend this special
# exception to the GPL to apply to your modified version as well, *unless*
# your modified version has the potential to copy into its output some
# of the text that was the non-data portion of the version that you started
# with. (In other words, unless your change moves or copies text from
# the non-data portions to the data portions.) If your modification has
# such potential, you must delete any notice of this special exception
# to the GPL from your modified version.
#
# Written by David MacKenzie, with help from
# Franc,ois Pinard, Karl Berry, Richard Pixley, Ian Lance Taylor,
# Roland McGrath, Noah Friedman, david d zuhn, and many others.
# Table of contents
#
# 1. Generic tests for functions.
# 2. Tests for specific functions.
## -------------------------------- ##
## 1. Generic tests for functions. ##
## -------------------------------- ##
# AC_CHECK_FUNC(FUNCTION, [ACTION-IF-FOUND], [ACTION-IF-NOT-FOUND])
# -----------------------------------------------------------------
AC_DEFUN([AC_CHECK_FUNC],
[AC_VAR_PUSHDEF([ac_var], [ac_cv_func_$1])dnl
AC_CACHE_CHECK([for $1], ac_var,
[AC_LINK_IFELSE([AC_LANG_FUNC_LINK_TRY([$1])],
[AC_VAR_SET(ac_var, yes)],
[AC_VAR_SET(ac_var, no)])])
AC_SHELL_IFELSE([test AC_VAR_GET(ac_var) = yes],
[$2], [$3])dnl
AC_VAR_POPDEF([ac_var])dnl
])# AC_CHECK_FUNC
# AC_CHECK_FUNCS(FUNCTION..., [ACTION-IF-FOUND], [ACTION-IF-NOT-FOUND])
# ---------------------------------------------------------------------
AC_DEFUN([AC_CHECK_FUNCS],
[AC_FOREACH([AC_Func], [$1],
[AH_TEMPLATE(AC_TR_CPP(HAVE_[]AC_Func),
[Define if you have the `]AC_Func[' function.])])dnl
for ac_func in $1
do
AC_CHECK_FUNC($ac_func,
[AC_DEFINE_UNQUOTED(AC_TR_CPP(HAVE_$ac_func)) $2],
[$3])dnl
done
])
# AC_REPLACE_FUNCS(FUNCTION...)
# -----------------------------
AC_DEFUN([AC_REPLACE_FUNCS],
[AC_FOREACH([AC_Func], [$1], [AC_LIBOBJ_DECL(AC_Func)])dnl
AC_CHECK_FUNCS([$1], , [_AC_LIBOBJ($ac_func)])
])
# AU::AC_FUNC_CHECK
# -----------------
AU_ALIAS([AC_FUNC_CHECK], [AC_CHECK_FUNC])
# AU::AC_HAVE_FUNCS
# -----------------
AU_ALIAS([AC_HAVE_FUNCS], [AC_CHECK_FUNCS])
## --------------------------------- ##
## 2. Tests for specific functions. ##
## --------------------------------- ##
# The macros are sorted:
#
# 1. AC_FUNC_* macros are sorted by alphabetical order.
#
# 2. Helping macros such as _AC_LIBOBJ_* are before the macro that
# uses it.
#
# 3. Obsolete macros are right after the modern macro.
# _AC_LIBOBJ_ALLOCA
# -----------------
# Set up the LIBOBJ replacement of `alloca'. Well, not exactly
# AC_LIBOBJ since we actually set the output variable `ALLOCA'.
# Nevertheless, for Automake, AC_LIBOBJ_DECL it.
define([_AC_LIBOBJ_ALLOCA],
[# 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.
AC_LIBOBJ_DECL(alloca)
AC_SUBST(ALLOCA, alloca.$ac_objext)dnl
AC_DEFINE(C_ALLOCA, 1, [Define if using `alloca.c'.])
AC_CACHE_CHECK(whether `alloca.c' 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,
[Define to one of `_getb67', `GETB67',
`getb67' for Cray-2 and Cray-YMP
systems. This function is required for
`alloca.c' support on those systems.])
break])
done
fi
AC_CACHE_CHECK(stack direction for C alloca, ac_cv_c_stack_direction,
[AC_TRY_RUN(
[int
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;
}
int
main ()
{
exit (find_stack_direction () < 0);
}], ac_cv_c_stack_direction=1, ac_cv_c_stack_direction=-1,
ac_cv_c_stack_direction=0)])
AH_VERBATIM([STACK_DIRECTION],
[/* If using the C implementation of alloca, define if you know the
direction of stack growth for your system; otherwise it will be
automatically deduced at run-time.
STACK_DIRECTION > 0 => grows toward higher addresses
STACK_DIRECTION < 0 => grows toward lower addresses
STACK_DIRECTION = 0 => direction of growth unknown */
@%:@undef STACK_DIRECTION])dnl
AC_DEFINE_UNQUOTED(STACK_DIRECTION, $ac_cv_c_stack_direction)
])# _AC_LIBOBJ_ALLOCA
# AC_FUNC_ALLOCA
# --------------
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_working_alloca_h,
[AC_TRY_LINK([@%:@include <alloca.h>],
[char *p = (char *) alloca (2 * sizeof (int));],
ac_cv_working_alloca_h=yes, ac_cv_working_alloca_h=no)])
if test $ac_cv_working_alloca_h = yes; then
AC_DEFINE(HAVE_ALLOCA_H, 1,
[Define if you have <alloca.h> and it should be used
(not on Ultrix).])
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, 1,
[Define if you have `alloca', as a function or macro.])
else
_AC_LIBOBJ_ALLOCA
fi
])# AC_FUNC_ALLOCA
# AU::AC_ALLOCA
# -------------
AU_ALIAS([AC_ALLOCA], [AC_FUNC_ALLOCA])
# AC_FUNC_CHOWN
# -------------
# Determine whether chown accepts arguments of -1 for uid and gid.
AC_DEFUN([AC_FUNC_CHOWN],
[AC_REQUIRE([AC_TYPE_UID_T])dnl
AC_CHECK_HEADERS(unistd.h)
AC_CACHE_CHECK([for working chown], ac_cv_func_chown_works,
[AC_TRY_RUN([
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#ifdef HAVE_UNISTD_H
# include <unistd.h>
#endif
int
main ()
{
char *f = "conftestchown";
struct stat before, after;
if (creat (f, 0600) < 0)
exit (1);
if (stat (f, &before) < 0)
exit (1);
if (chown (f, (uid_t) -1, (gid_t) -1) == -1)
exit (1);
if (stat (f, &after) < 0)
exit (1);
exit ((before.st_uid == after.st_uid
&& before.st_gid == after.st_gid) ? 0 : 1);
}],
ac_cv_func_chown_works=yes,
ac_cv_func_chown_works=no,
ac_cv_func_chown_works=no)])
if test $ac_cv_func_chown_works = yes; then
AC_DEFINE(HAVE_CHOWN, 1,
[Define if your system has a working `chown' function.])
fi
])# AC_FUNC_CHOWN
# AC_FUNC_CLOSEDIR_VOID
# ---------------------
# Check whether closedir returns void, and #define CLOSEDIR_VOID in
# that case.
AC_DEFUN([AC_FUNC_CLOSEDIR_VOID],
[AC_REQUIRE([AC_HEADER_DIRENT])dnl
AC_CACHE_CHECK(whether closedir returns void, ac_cv_func_closedir_void,
[AC_TRY_RUN(
[#include <sys/types.h>
#include <$ac_header_dirent>
int closedir ();
int
main ()
{
exit (closedir (opendir (".")) != 0);
}],
ac_cv_func_closedir_void=no,
ac_cv_func_closedir_void=yes,
ac_cv_func_closedir_void=yes)])
if test $ac_cv_func_closedir_void = yes; then
AC_DEFINE(CLOSEDIR_VOID, 1,
[Define if the `closedir' function returns void instead of `int'.])
fi
])
# AC_FUNC_ERROR_AT_LINE
# ---------------------
AC_DEFUN([AC_FUNC_ERROR_AT_LINE],
[AC_CACHE_CHECK([for error_at_line], ac_cv_lib_error_at_line,
[AC_TRY_LINK([],[error_at_line (0, 0, "", 0, "");],
ac_cv_lib_error_at_line=yes,
ac_cv_lib_error_at_line=no)])
if test $ac_cv_lib_error_at_line = no; then
AC_LIBOBJ(error)
fi
])
# AU::AM_FUNC_ERROR_AT_LINE
# -------------------------
# FIXME: Because Automake macros are defined with their name unquoted,
# we can't yet provide the Autoupdate glue.
# AU_ALIAS([AM_FUNC_ERROR_AT_LINE], [AC_FUNC_ERROR_AT_LINE])
# AC_FUNC_FNMATCH
# ---------------
# We look for fnmatch.h to avoid that the test fails in C++.
AC_DEFUN([AC_FUNC_FNMATCH],
[AC_CHECK_HEADERS(fnmatch.h)
AC_CACHE_CHECK(for working fnmatch, ac_cv_func_fnmatch_works,
# Some versions of Solaris or SCO have a broken fnmatch function.
# So we run a test program. If we are cross-compiling, take no chance.
# Thanks to John Oleynick and Franc,ois Pinard for this test.
[AC_TRY_RUN(
[#if HAVE_FNMATCH_H
# include <fnmatch.h>
#endif
int
main ()
{
exit (fnmatch ("a*", "abc", 0) != 0);
}],
ac_cv_func_fnmatch_works=yes, ac_cv_func_fnmatch_works=no,
ac_cv_func_fnmatch_works=no)])
if test $ac_cv_func_fnmatch_works = yes; then
AC_DEFINE(HAVE_FNMATCH, 1,
[Define if your system has a working `fnmatch' function.])
fi
])# AC_FUNC_FNMATCH
# AU::AM_FUNC_FNMATCH
# and
# AU::fp_FUNC_FNMATCH
# -------------------
# FIXME: Because Automake macros are defined with their name unquoted,
# we can't yet provide the Autoupdate glue.
# AU_ALIAS([AM_FUNC_FNMATCH], [AC_FUNC_FNMATCH])
AU_ALIAS([fp_FUNC_FNMATCH], [AC_FUNC_FNMATCH])
# AC_FUNC_GETGROUPS
# -----------------
# Try to find `getgroups', and check that it works.
# When crosscompiling, assume getgroups is broken.
AC_DEFUN([AC_FUNC_GETGROUPS],
[AC_REQUIRE([AC_TYPE_GETGROUPS])dnl
AC_REQUIRE([AC_TYPE_SIZE_T])dnl
AC_CHECK_FUNC(getgroups)
# If we don't yet have getgroups, see if it's in -lbsd.
# This is reported to be necessary on an ITOS 3000WS running SEIUX 3.1.
ac_save_LIBS=$LIBS
if test $ac_cv_func_getgroups = no; then
AC_CHECK_LIB(bsd, getgroups, [GETGROUPS_LIB=-lbsd])
fi
# Run the program to test the functionality of the system-supplied
# getgroups function only if there is such a function.
if test $ac_cv_func_getgroups = yes; then
AC_CACHE_CHECK([for working getgroups], ac_cv_func_getgroups_works,
[AC_TRY_RUN([
int
main ()
{
/* On Ultrix 4.3, getgroups (0, 0) always fails. */
exit (getgroups (0, 0) == -1 ? 1 : 0);
}],
ac_cv_func_getgroups_works=yes,
ac_cv_func_getgroups_works=no,
ac_cv_func_getgroups_works=no)
])
if test $ac_cv_func_getgroups_works = yes; then
AC_DEFINE(HAVE_GETGROUPS, 1,
[Define if your system has a working `getgroups' function.])
fi
fi
LIBS=$ac_save_LIBS
])# AC_FUNC_GETGROUPS
# _AC_LIBOBJ_GETLOADAVG
# ---------------------
# Set up the AC_LIBOBJ replacement of `getloadavg'.
define([_AC_LIBOBJ_GETLOADAVG],
[AC_LIBOBJ(getloadavg)
AC_DEFINE(C_GETLOADAVG, 1, [Define if using `getloadavg.c'.])
# 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, 1, [Define for DGUX with <sys/dg_sys_info.h>.])
AC_CHECK_LIB(dgc, dg_sys_info)])
AC_CHECK_HEADER(locale.h)
AC_CHECK_FUNCS(setlocale)
# 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, 1, [Define on System V Release 4.])
fi
if test $ac_have_func = no; then
AC_CHECK_HEADER(inq_stats/cpustats.h,
[ac_have_func=yes
AC_DEFINE(UMAX, 1, [Define for Encore UMAX.])
AC_DEFINE(UMAX4_3, 1,
[Define for Encore UMAX 4.3 that has <inq_status/cpustats.h>
instead of <sys/cpustats.h>.])])
fi
if test $ac_have_func = no; then
AC_CHECK_HEADER(sys/cpustats.h,
[ac_have_func=yes; AC_DEFINE(UMAX)])
fi
if test $ac_have_func = no; then
AC_CHECK_HEADERS(mach/mach.h)
fi
AC_CHECK_HEADERS(nlist.h,
[AC_CHECK_MEMBERS([struct nlist.n_un.n_name],
[AC_DEFINE(NLIST_NAME_UNION, 1,
[Define if your `struct nlist' has an
`n_un' member. Obsolete, depend on
`HAVE_STRUCT_NLIST_N_UN_N_NAME])], [],
[@%:@include <nlist.h>])
])dnl
])# _AC_LIBOBJ_GETLOADAVG
# AC_FUNC_GETLOADAVG
# ------------------
AC_DEFUN([AC_FUNC_GETLOADAVG],
[ac_have_func=no # yes means we've found a way to get the load average.
ac_save_LIBS=$LIBS
# Check for getloadavg, but be sure not to touch the cache variable.
(AC_CHECK_FUNC(getloadavg, exit 0, exit 1)) && ac_have_func=yes
# On HPUX9, an unprivileged user can get load averages through this function.
AC_CHECK_FUNCS(pstat_getdynamic)
# Solaris has libkstat which does not require root.
AC_CHECK_LIB(kstat, kstat_open)
test $ac_cv_lib_kstat_kstat_open = yes && ac_have_func=yes
# 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.
# For kstat on solaris, we need libelf to force the definition of SVR4 below.
if test $ac_have_func = no; then
AC_CHECK_LIB(elf, elf_begin, LIBS="-lelf $LIBS")
fi
if test $ac_have_func = no; then
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])
fi
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,
# otherwise set up the replacement function.
AC_CHECK_FUNCS(getloadavg, [],
[_AC_LIBOBJ_GETLOADAVG])
# 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, 1,
[Define if the `getloadavg' function needs to be run setuid
or setgid.])
else
NEED_SETGID=false
fi
AC_SUBST(NEED_SETGID)dnl
if test $ac_cv_func_getloadavg_setgid = yes; then
AC_CACHE_CHECK(group of /dev/kmem, ac_cv_group_kmem,
[ # On Solaris, /dev/kmem is a symlink. Get info on the real file.
ac_ls_output=`ls -lgL /dev/kmem 2>/dev/null`
# If we got an error (system does not support symlinks), try without -L.
test -z "$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;']`
])
AC_SUBST(KMEM_GROUP, $ac_cv_group_kmem)dnl
fi
if test "x$ac_save_LIBS" = x; then
GETLOADAVG_LIBS=$LIBS
else
GETLOADAVG_LIBS=`echo "$LIBS" | sed "s!$ac_save_LIBS!!"`
fi
LIBS=$ac_save_LIBS
AC_SUBST(GETLOADAVG_LIBS)dnl
])# AC_FUNC_GETLOADAVG
# AU::AC_GETLOADAVG
# -----------------
AU_ALIAS([AC_GETLOADAVG], [AC_FUNC_GETLOADAVG])
# AC_FUNC_GETMNTENT
# -----------------
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, 1,
[Define if you have the `getmntent' function.])])])
# AC_FUNC_GETPGRP
# ---------------
AC_DEFUN([AC_FUNC_GETPGRP],
[AC_CACHE_CHECK(whether getpgrp takes no argument, ac_cv_func_getpgrp_void,
[AC_TRY_RUN(
[/*
* If this system has a BSD-style getpgrp(),
* which takes a pid argument, exit unsuccessfully.
*
* Snarfed from Chet Ramey's bash pgrp.c test program
*/
#include <stdio.h>
#include <sys/types.h>
int pid;
int pg1, pg2, pg3, pg4;
int ng, np, s, child;
int
main ()
{
pid = getpid ();
pg1 = getpgrp (0);
pg2 = getpgrp ();
pg3 = getpgrp (pid);
pg4 = getpgrp (1);
/* If all of these values are the same, it's pretty sure that we're
on a system that ignores getpgrp's first argument. */
if (pg2 == pg4 && pg1 == pg3 && pg2 == pg3)
exit (0);
child = fork ();
if (child < 0)
exit(1);
else if (child == 0)
{
np = getpid ();
/* If this is Sys V, this will not work; pgrp will be set to np
because setpgrp just changes a pgrp to be the same as the
pid. */
setpgrp (np, pg1);
ng = getpgrp (0); /* Same result for Sys V and BSD */
if (ng == pg1)
exit (1);
else
exit (0);
}
else
{
wait (&s);
exit (s>>8);
}
}], ac_cv_func_getpgrp_void=yes, ac_cv_func_getpgrp_void=no,
AC_MSG_ERROR(cannot check getpgrp if cross compiling))
])
if test $ac_cv_func_getpgrp_void = yes; then
AC_DEFINE(GETPGRP_VOID, 1,
[Define if the `getpgrp' function takes no argument.])
fi
])# AC_FUNC_GETPGRP
# AC_FUNC_LSTAT_FOLLOWS_SLASHED_SYMLINK
# -------------------------------------
# When crosscompiling, be pessimistic so we will end up using the
# replacement version of lstat that checkes for trailing slashes and
# calls lstat a second time when necessary.
AC_DEFUN([AC_FUNC_LSTAT_FOLLOWS_SLASHED_SYMLINK],
[AC_CACHE_CHECK(
[whether lstat dereferences a symlink specified with a trailing slash],
[ac_cv_func_lstat_dereferences_slashed_symlink],
[rm -f conftest.sym conftest.file
echo >conftest.file
if ln -s conftest.file conftest.sym; then
AC_TRY_RUN([
# include <sys/types.h>
# include <sys/stat.h>
int
main ()
{
struct stat sbuf;
/* Linux will dereference the symlink and fail.
That is better in the sense that it means we will not
have to compile and use the lstat wrapper. */
exit (lstat ("conftest.sym/", &sbuf) ? 0 : 1);
}
],
ac_cv_func_lstat_dereferences_slashed_symlink=yes,
ac_cv_func_lstat_dereferences_slashed_symlink=no,
ac_cv_func_lstat_dereferences_slashed_symlink=no
)
else
# If the `ln -s' command failed, then we probably don't even
# have an lstat function.
ac_cv_func_lstat_dereferences_slashed_symlink=no
fi
])
test $ac_cv_func_lstat_dereferences_slashed_symlink = yes &&
AC_DEFINE_UNQUOTED(LSTAT_FOLLOWS_SLASHED_SYMLINK, 1,
[Define if `lstat' dereferences a symlink specified
with a trailing slash.])
if test $ac_cv_func_lstat_dereferences_slashed_symlink = no; then
AC_LIBOBJ(lstat)
fi
])
# AC_FUNC_MALLOC
# --------------
# Is `malloc (0)' properly handled?
AC_DEFUN([AC_FUNC_MALLOC],
[AC_REQUIRE([AC_HEADER_STDC])dnl
AC_CACHE_CHECK([for working malloc], ac_cv_func_malloc_works,
[AC_TRY_RUN(
[#if STDC_HEADERS || HAVE_STDLIB_H
# include <stdlib.h>
#else
char *malloc ();
#endif
int
main ()
{
exit (malloc (0) ? 0 : 1);
}],
ac_cv_func_malloc_works=yes,
ac_cv_func_malloc_works=no,
ac_cv_func_malloc_works=no)
])
if test $ac_cv_func_malloc_works = yes; then
AC_DEFINE(HAVE_MALLOC, 1,
[Define if your system has a working `malloc' function.])
fi
])# AC_FUNC_MALLOC
# AC_FUNC_MEMCMP
# --------------
AC_DEFUN([AC_FUNC_MEMCMP],
[AC_CACHE_CHECK([for working memcmp], ac_cv_func_memcmp_working,
[AC_TRY_RUN([
int
main ()
{
/* Some versions of memcmp are not 8-bit clean. */
char c0 = 0x40, c1 = 0x80, c2 = 0x81;
if (memcmp(&c0, &c2, 1) >= 0 || memcmp(&c1, &c2, 1) >= 0)
exit (1);
/* The Next x86 OpenStep bug shows up only when comparing 16 bytes
or more and with at least one buffer not starting on a 4-byte boundary.
William Lewis provided this test program. */
{
char foo[21];
char bar[21];
int i;
for (i = 0; i < 4; i++)
{
char *a = foo + i;
char *b = bar + i;
strcpy (a, "--------01111111");
strcpy (b, "--------10000000");
if (memcmp (a, b, 16) >= 0)
exit (1);
}
exit (0);
}
}]
ac_cv_func_memcmp_working=yes,
ac_cv_func_memcmp_working=no,
ac_cv_func_memcmp_working=no)])
test $ac_cv_func_memcmp_working = no && AC_LIBOBJ([memcmp])
])# AC_FUNC_MEMCMP
# AC_FUNC_MKTIME
# --------------
AC_DEFUN([AC_FUNC_MKTIME],
[AC_REQUIRE([AC_HEADER_TIME])dnl
AC_CHECK_HEADERS(sys/time.h unistd.h)
AC_CHECK_FUNCS(alarm)
AC_CACHE_CHECK([for working mktime], ac_cv_func_working_mktime,
[AC_TRY_RUN(
[/* Test program from Paul Eggert and Tony Leneis. */
#if TIME_WITH_SYS_TIME
# include <sys/time.h>
# include <time.h>
#else
# if HAVE_SYS_TIME_H
# include <sys/time.h>
# else
# include <time.h>
# endif
#endif
#if HAVE_UNISTD_H
# include <unistd.h>
#endif
#if !HAVE_ALARM
# define alarm(X) /* empty */
#endif
/* Work around redefinition to rpl_putenv by other config tests. */
#undef putenv
static time_t time_t_max;
/* Values we'll use to set the TZ environment variable. */
static const char *const tz_strings[] = {
(const char *) 0, "TZ=GMT0", "TZ=JST-9",
"TZ=EST+3EDT+2,M10.1.0/00:00:00,M2.3.0/00:00:00"
};
#define N_STRINGS (sizeof (tz_strings) / sizeof (tz_strings[0]))
/* Fail if mktime fails to convert a date in the spring-forward gap.
Based on a problem report from Andreas Jaeger. */
static void
spring_forward_gap ()
{
/* glibc (up to about 1998-10-07) failed this test) */
struct tm tm;
/* Use the portable POSIX.1 specification "TZ=PST8PDT,M4.1.0,M10.5.0"
instead of "TZ=America/Vancouver" in order to detect the bug even
on systems that don't support the Olson extension, or don't have the
full zoneinfo tables installed. */
putenv ("TZ=PST8PDT,M4.1.0,M10.5.0");
tm.tm_year = 98;
tm.tm_mon = 3;
tm.tm_mday = 5;
tm.tm_hour = 2;
tm.tm_min = 0;
tm.tm_sec = 0;
tm.tm_isdst = -1;
if (mktime (&tm) == (time_t)-1)
exit (1);
}
static void
mktime_test (now)
time_t now;
{
struct tm *lt;
if ((lt = localtime (&now)) && mktime (lt) != now)
exit (1);
now = time_t_max - now;
if ((lt = localtime (&now)) && mktime (lt) != now)
exit (1);
}
static void
irix_6_4_bug ()
{
/* Based on code from Ariel Faigon. */
struct tm tm;
tm.tm_year = 96;
tm.tm_mon = 3;
tm.tm_mday = 0;
tm.tm_hour = 0;
tm.tm_min = 0;
tm.tm_sec = 0;
tm.tm_isdst = -1;
mktime (&tm);
if (tm.tm_mon != 2 || tm.tm_mday != 31)
exit (1);
}
static void
bigtime_test (j)
int j;
{
struct tm tm;
time_t now;
tm.tm_year = tm.tm_mon = tm.tm_mday = tm.tm_hour = tm.tm_min = tm.tm_sec = j;
now = mktime (&tm);
if (now != (time_t) -1)
{
struct tm *lt = localtime (&now);
if (! (lt
&& lt->tm_year == tm.tm_year
&& lt->tm_mon == tm.tm_mon
&& lt->tm_mday == tm.tm_mday
&& lt->tm_hour == tm.tm_hour
&& lt->tm_min == tm.tm_min
&& lt->tm_sec == tm.tm_sec
&& lt->tm_yday == tm.tm_yday
&& lt->tm_wday == tm.tm_wday
&& ((lt->tm_isdst < 0 ? -1 : 0 < lt->tm_isdst)
== (tm.tm_isdst < 0 ? -1 : 0 < tm.tm_isdst))))
exit (1);
}
}
int
main ()
{
time_t t, delta;
int i, j;
/* This test makes some buggy mktime implementations loop.
Give up after 60 seconds; a mktime slower than that
isn't worth using anyway. */
alarm (60);
for (time_t_max = 1; 0 < time_t_max; time_t_max *= 2)
continue;
time_t_max--;
delta = time_t_max / 997; /* a suitable prime number */
for (i = 0; i < N_STRINGS; i++)
{
if (tz_strings[i])
putenv (tz_strings[i]);
for (t = 0; t <= time_t_max - delta; t += delta)
mktime_test (t);
mktime_test ((time_t) 60 * 60);
mktime_test ((time_t) 60 * 60 * 24);
for (j = 1; 0 < j; j *= 2)
bigtime_test (j);
bigtime_test (j - 1);
}
irix_6_4_bug ();
spring_forward_gap ();
exit (0);
}],
ac_cv_func_working_mktime=yes, ac_cv_func_working_mktime=no,
ac_cv_func_working_mktime=no)])
if test $ac_cv_func_working_mktime = no; then
AC_LIBOBJ([mktime])
fi
])# AC_FUNC_MKTIME
# AU::AM_FUNC_MKTIME
# ------------------
# FIXME: Because Automake macros are defined with their name unquoted,
# we can't yet provide the Autoupdate glue.
# AU_ALIAS([AM_FUNC_MKTIME], [AC_FUNC_MKTIME])
# AC_FUNC_MMAP
# ------------
AC_DEFUN([AC_FUNC_MMAP],
[AC_CHECK_HEADERS(stdlib.h unistd.h sys/stat.h)
AC_CHECK_FUNCS(getpagesize)
AC_CACHE_CHECK(for working mmap, ac_cv_func_mmap_fixed_mapped,
[AC_TRY_RUN(
[/* Thanks to Mike Haertel and Jim Avera for this test.
Here is a matrix of mmap possibilities:
mmap private not fixed
mmap private fixed at somewhere currently unmapped
mmap private fixed at somewhere already mapped
mmap shared not fixed
mmap shared fixed at somewhere currently unmapped
mmap shared fixed at somewhere already mapped
For private mappings, we should verify that changes cannot be read()
back from the file, nor mmap's back from the file at a different
address. (There have been systems where private was not correctly
implemented like the infamous i386 svr4.0, and systems where the
VM page cache was not coherent with the file system buffer cache
like early versions of FreeBSD and possibly contemporary NetBSD.)
For shared mappings, we should conversely verify that changes get
propogated back to all the places they're supposed to be.
Grep wants private fixed already mapped.
The main things grep needs to know about mmap are:
* does it exist and is it safe to write into the mmap'd area
* how to use it (BSD variants) */
#include <sys/types.h>
#include <fcntl.h>
#include <sys/mman.h>
#if STDC_HEADERS || HAVE_STDLIB_H
# include <stdlib.h>
#else
char *malloc ();
#endif
#if HAVE_UNISTD_H
# include <unistd.h>
#endif
#if HAVE_SYS_STAT_H
# include <sys/stat.h>
#endif
/* This mess was copied from the GNU getpagesize.h. */
#if !HAVE_GETPAGESIZE
/* Assume that all systems that can run configure have sys/param.h. */
# if !HAVE_SYS_PARAM_H
# define HAVE_SYS_PARAM_H 1
# endif
# ifdef _SC_PAGESIZE
# define getpagesize() sysconf(_SC_PAGESIZE)
# else /* no _SC_PAGESIZE */
# if HAVE_SYS_PARAM_H
# include <sys/param.h>
# ifdef EXEC_PAGESIZE
# define getpagesize() EXEC_PAGESIZE
# else /* no EXEC_PAGESIZE */
# ifdef NBPG
# define getpagesize() NBPG * CLSIZE
# ifndef CLSIZE
# define CLSIZE 1
# endif /* no CLSIZE */
# else /* no NBPG */
# ifdef NBPC
# define getpagesize() NBPC
# else /* no NBPC */
# ifdef PAGESIZE
# define getpagesize() PAGESIZE
# endif /* PAGESIZE */
# endif /* no NBPC */
# endif /* no NBPG */
# endif /* no EXEC_PAGESIZE */
# else /* no HAVE_SYS_PARAM_H */
# define getpagesize() 8192 /* punt totally */
# endif /* no HAVE_SYS_PARAM_H */
# endif /* no _SC_PAGESIZE */
#endif /* no HAVE_GETPAGESIZE */
int
main ()
{
char *data, *data2, *data3;
int i, pagesize;
int fd;
pagesize = getpagesize ();
/* First, make a file with some known garbage in it. */
data = (char *) malloc (pagesize);
if (!data)
exit (1);
for (i = 0; i < pagesize; ++i)
*(data + i) = rand ();
umask (0);
fd = creat ("conftestmmap", 0600);
if (fd < 0)
exit (1);
if (write (fd, data, pagesize) != pagesize)
exit (1);
close (fd);
/* Next, try to mmap the file at a fixed address which already has
something else allocated at it. If we can, also make sure that
we see the same garbage. */
fd = open ("conftestmmap", O_RDWR);
if (fd < 0)
exit (1);
data2 = (char *) malloc (2 * pagesize);
if (!data2)
exit (1);
data2 += (pagesize - ((int) data2 & (pagesize - 1))) & (pagesize - 1);
if (data2 != mmap (data2, pagesize, PROT_READ | PROT_WRITE,
MAP_PRIVATE | MAP_FIXED, fd, 0L))
exit (1);
for (i = 0; i < pagesize; ++i)
if (*(data + i) != *(data2 + i))
exit (1);
/* Finally, make sure that changes to the mapped area do not
percolate back to the file as seen by read(). (This is a bug on
some variants of i386 svr4.0.) */
for (i = 0; i < pagesize; ++i)
*(data2 + i) = *(data2 + i) + 1;
data3 = (char *) malloc (pagesize);
if (!data3)
exit (1);
if (read (fd, data3, pagesize) != pagesize)
exit (1);
for (i = 0; i < pagesize; ++i)
if (*(data + i) != *(data3 + i))
exit (1);
close (fd);
unlink ("conftestmmap");
exit (0);
}], ac_cv_func_mmap_fixed_mapped=yes, ac_cv_func_mmap_fixed_mapped=no,
ac_cv_func_mmap_fixed_mapped=no)])
if test $ac_cv_func_mmap_fixed_mapped = yes; then
AC_DEFINE(HAVE_MMAP, 1,
[Define if you have a working `mmap' system call.])
fi
])# AC_FUNC_MMAP
# AU::AC_MMAP
# -----------
AU_ALIAS([AC_MMAP], [AC_FUNC_MMAP])
# AC_FUNC_OBSTACK
# ---------------
# Ensure obstack support. Yeah, this is not exactly a `FUNC' check.
AC_DEFUN([AC_FUNC_OBSTACK],
[AC_CACHE_CHECK([for obstacks], ac_cv_func_obstack,
[AC_TRY_LINK([@%:@include "obstack.h"],
[struct obstack *mem;obstack_free(mem,(char *) 0)],
ac_cv_func_obstack=yes,
ac_cv_func_obstack=no)])
if test $ac_cv_func_obstack = yes; then
AC_DEFINE(HAVE_OBSTACK, 1, [Define if libc includes obstacks.])
else
AC_LIBOBJ(obstack)
fi
])# AC_FUNC_OBSTACK
# AU::AM_FUNC_OBSTACK
# -------------------
# FIXME: Because Automake macros are defined with their name unquoted,
# we can't yet provide the Autoupdate glue.
# AU_ALIAS([AM_FUNC_OBSTACK], [AC_FUNC_OBSTACK])
# AC_FUNC_SELECT_ARGTYPES
# -----------------------
# Determine the correct type to be passed to each of the `select'
# function's arguments, and define those types in `SELECT_TYPE_ARG1',
# `SELECT_TYPE_ARG234', and `SELECT_TYPE_ARG5'.
AC_DEFUN([AC_FUNC_SELECT_ARGTYPES],
[AC_CACHE_CHECK([types of arguments for select],
[ac_cv_func_select_args],
[for ac_arg234 in 'fd_set *' 'int *' 'void *'; do
for ac_arg1 in 'int' 'size_t' 'unsigned long' 'unsigned'; do
for ac_arg5 in 'struct timeval *' 'const struct timeval *'; do
AC_COMPILE_IFELSE([AC_LANG_PROGRAM(
[#include <sys/types.h>
#if HAVE_SYS_TIME_H
# include <sys/time.h>
#endif
#if HAVE_SYS_SELECT_H
# include <sys/select.h>
#endif
#if HAVE_SYS_SOCKET_H
# include <sys/socket.h>
#endif
extern int select ($ac_arg1,$ac_arg234,$ac_arg234,$ac_arg234,$ac_arg5);])],
[ac_cv_func_select_args="$ac_arg1,$ac_arg234,$ac_arg5"; break 3])
done
done
done
# Provide a safe default value.
: ${ac_cv_func_select_args='int,int *,struct timeval *'}
])
ac_save_IFS=$IFS; IFS=','
set dummy `echo "$ac_cv_func_select_args" | sed 's/\*/\*/g'`
IFS=$ac_save_IFS
shift
AC_DEFINE_UNQUOTED(SELECT_TYPE_ARG1, $[1],
[Define to the type of arg 1 for `select'.])
AC_DEFINE_UNQUOTED(SELECT_TYPE_ARG234, ($[2]),
[Define to the type of args 2, 3 and 4 for `select'.])
AC_DEFINE_UNQUOTED(SELECT_TYPE_ARG5, ($[3]),
[Define to the type of arg 5 for `select'.])
])# AC_FUNC_SELECT_ARGTYPES
# AC_FUNC_SETPGRP
# ---------------
AC_DEFUN([AC_FUNC_SETPGRP],
[AC_CACHE_CHECK(whether setpgrp takes no argument, ac_cv_func_setpgrp_void,
[AC_TRY_RUN(
[#if HAVE_UNISTD_H
# include <unistd.h>
#endif
/* If this system has a BSD-style setpgrp, which takes arguments, exit
successfully. */
int
main ()
{
if (setpgrp (1,1) == -1)
exit (0);
else
exit (1);
}],
[ac_cv_func_setpgrp_void=no],
[ac_cv_func_setpgrp_void=yes],
[AC_MSG_ERROR([cannot check setpgrp if cross compiling])])])
if test $ac_cv_func_setpgrp_void = yes; then
AC_DEFINE(SETPGRP_VOID, 1,
[Define if the `setpgrp' function takes no argument.])
fi
])# AC_FUNC_SETPGRP
# _AC_FUNC_STAT(STAT | LSTAT)
# ---------------------------
# Determine whether stat or lstat have the bug that it succeeds when
# given the zero-length file name argument. The stat and lstat from
# SunOS4.1.4 and the Hurd (as of 1998-11-01) do this.
#
# If it does, then define HAVE_STAT_EMPTY_STRING_BUG (or
# HAVE_LSTAT_EMPTY_STRING_BUG) and arrange to compile the wrapper
# function.
define([_AC_FUNC_STAT],
[AC_REQUIRE([AC_FUNC_LSTAT_FOLLOWS_SLASHED_SYMLINK])dnl
AC_CACHE_CHECK([whether $1 accepts an empty string],
[ac_cv_func_$1_empty_string_bug],
[AC_TRY_RUN(
[#include <sys/types.h>
#include <sys/stat.h>
int
main ()
{
struct stat sbuf;
exit ($1 ("", &sbuf) ? 1 : 0);
}],
[ac_cv_func_$1_empty_string_bug=yes],
[ac_cv_func_$1_empty_string_bug=no],
[ac_cv_func_$1_empty_string_bug=yes])])
if test $ac_cv_func_$1_empty_string_bug = yes; then
AC_LIBOBJ([$1])
AC_DEFINE_UNQUOTED(AC_TR_CPP([HAVE_$1_EMPTY_STRING_BUG]), 1,
[Define if `$1' has the bug that it succeeds when
given the zero-length file name argument.])
fi
])# _AC_FUNC_STAT
# AC_FUNC_STAT & AC_FUNC_LSTAT
# ----------------------------
AC_DEFUN([AC_FUNC_STAT], [_AC_FUNC_STAT(stat)])
AC_DEFUN([AC_FUNC_LSTAT], [_AC_FUNC_STAT(lstat)])
# _AC_LIBOBJ_STRTOD
# -----------------
define([_AC_LIBOBJ_STRTOD],
[AC_LIBOBJ(strtod)
AC_CHECK_FUNC(pow)
if test $ac_cv_func_pow = no; then
AC_CHECK_LIB(m, pow,
[POW_LIB=-lm],
[AC_MSG_WARN(can't find library containing definition of pow)])
fi
])# _AC_LIBOBJ_STRTOD
# AC_FUNC_STRTOD
# --------------
AC_DEFUN([AC_FUNC_STRTOD],
[AC_CACHE_CHECK(for working strtod, ac_cv_func_strtod,
[AC_TRY_RUN([
double strtod ();
int
main()
{
{
/* Some versions of Linux strtod mis-parse strings with leading '+'. */
char *string = " +69";
char *term;
double value;
value = strtod (string, &term);
if (value != 69 || term != (string + 4))
exit (1);
}
{
/* Under Solaris 2.4, strtod returns the wrong value for the
terminating character under some conditions. */
char *string = "NaN";
char *term;
strtod (string, &term);
if (term != string && *(term - 1) == 0)
exit (1);
}
exit (0);
}
],
ac_cv_func_strtod=yes,
ac_cv_func_strtod=no,
ac_cv_func_strtod=no)])
if test $ac_cv_func_strtod = no; then
_AC_LIBOBJ_STRTOD
fi
])
# AU::AM_FUNC_STRTOD
# -------------------
# FIXME: Because Automake macros are defined with their name unquoted,
# we can't yet provide the Autoupdate glue.
# AU_ALIAS([AM_FUNC_STRTOD], [AC_FUNC_STRTOD])
# AC_FUNC_STRERROR_R
# ------------------
AC_DEFUN([AC_FUNC_STRERROR_R],
[AC_CHECK_FUNCS([strerror_r])
if test $ac_cv_func_strerror_r = yes; then
AC_CHECK_HEADERS(string.h)
AC_CACHE_CHECK([for working strerror_r],
ac_cv_func_strerror_r_works,
[
AC_TRY_COMPILE(
[
# include <stdio.h>
# if HAVE_STRING_H
# include <string.h>
# endif
],
[
char buf;
char x = *strerror_r (0, &buf, sizeof buf);
],
ac_cv_func_strerror_r_works=yes,
ac_cv_func_strerror_r_works=no
)])
if test $ac_cv_func_strerror_r_works = yes; then
AC_DEFINE_UNQUOTED(HAVE_WORKING_STRERROR_R, 1,
[Define to 1 if `strerror_r' returns a string.])
fi
fi
])# AC_FUNC_STRERROR_R
# AC_FUNC_STRFTIME
# ----------------
AC_DEFUN([AC_FUNC_STRFTIME],
[AC_CHECK_FUNCS(strftime, [],
[# strftime is in -lintl on SCO UNIX.
AC_CHECK_LIB(intl, strftime,
[AC_DEFINE(HAVE_STRFTIME)
LIBS="-lintl $LIBS"])])dnl
])# AC_FUNC_STRFTIME
# AC_FUNC_SETVBUF_REVERSED
# ------------------------
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. */
int
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, 1,
[Define if the `setvbuf' function takes the buffering type as
its second argument and the buffer pointer as the third, as on
System V before release 3.])
fi
])# AC_FUNC_SETVBUF_REVERSED
# AU::AC_SETVBUF_REVERSED
# -----------------------
AU_ALIAS([AC_SETVBUF_REVERSED], [AC_FUNC_SETVBUF_REVERSED])
# AC_FUNC_STRCOLL
# ---------------
AC_DEFUN([AC_FUNC_STRCOLL],
[AC_CACHE_CHECK(for working strcoll, ac_cv_func_strcoll_works,
[AC_TRY_RUN([#include <string.h>
int
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, 1,
[Define if you have the `strcoll' function and it is properly
defined.])
fi
])# AC_FUNC_STRCOLL
# AU::AC_STRCOLL
# --------------
AU_ALIAS([AC_STRCOLL], [AC_FUNC_STRCOLL])
# AC_FUNC_UTIME_NULL
# ------------------
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>
int
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, 1,
[Define if `utime(file, NULL)' sets file's timestamp to the
present.])
fi
])# AC_FUNC_UTIME_NULL
# AU::AC_UTIME_NULL
# -----------------
AU_ALIAS([AC_UTIME_NULL], [AC_FUNC_UTIME_NULL])
# AC_FUNC_VFORK
# -------------
AC_DEFUN([AC_FUNC_VFORK],
[AC_REQUIRE([AC_TYPE_PID_T])dnl
AC_CHECK_HEADERS(vfork.h)
AC_CACHE_CHECK(for working vfork, ac_cv_func_vfork_works,
[AC_TRY_RUN([/* Thanks to Paul Eggert for this test. */
#include <stdio.h>
#include <sys/types.h>
#include <sys/stat.h>
#if HAVE_UNISTD_H
# include <unistd.h>
#endif
#if HAVE_VFORK_H
# include <vfork.h>
#endif
/* On some sparc systems, changes by the child to local and incoming
argument registers are propagated back to the parent. The compiler
is told about this with #include <vfork.h>, but some compilers
(e.g. gcc -O) don't grok <vfork.h>. Test for this by using a
static variable whose address is put into a register that is
clobbered by the vfork. */
static
#ifdef __cplusplus
sparc_address_test (int arg)
# else
sparc_address_test (arg) int arg;
#endif
{
static pid_t child;
if (!child) {
child = vfork ();
if (child < 0) {
perror ("vfork");
_exit(2);
}
if (!child) {
arg = getpid();
write(-1, "", 0);
_exit (arg);
}
}
}
int
main ()
{
pid_t parent = getpid ();
pid_t child;
sparc_address_test ();
child = vfork ();
if (child == 0) {
/* Here is another test for sparc vfork register problems. This
test uses lots of local variables, at least as many local
variables as main has allocated so far including compiler
temporaries. 4 locals are enough for gcc 1.40.3 on a Solaris
4.1.3 sparc, but we use 8 to be safe. A buggy compiler should
reuse the register of parent for one of the local variables,
since it will think that parent can't possibly be used any more
in this routine. Assigning to the local variable will thus
munge parent in the parent process. */
pid_t
p = getpid(), p1 = getpid(), p2 = getpid(), p3 = getpid(),
p4 = getpid(), p5 = getpid(), p6 = getpid(), p7 = getpid();
/* Convince the compiler that p..p7 are live; otherwise, it might
use the same hardware register for all 8 local variables. */
if (p != p1 || p != p2 || p != p3 || p != p4
|| p != p5 || p != p6 || p != p7)
_exit(1);
/* On some systems (e.g. IRIX 3.3), vfork doesn't separate parent
from child file descriptors. If the child closes a descriptor
before it execs or exits, this munges the parent's descriptor
as well. Test for this by closing stdout in the child. */
_exit(close(fileno(stdout)) != 0);
} else {
int status;
struct stat st;
while (wait(&status) != child)
;
exit(
/* Was there some problem with vforking? */
child < 0
/* Did the child fail? (This shouldn't happen.) */
|| 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 "x$ac_cv_func_vfork_works" = xno; then
AC_DEFINE(vfork, fork, [Define as `fork' if `vfork' does not work.])
fi
])# AC_FUNC_VFORK
# AU::AC_VFORK
# ------------
AU_ALIAS([AC_VFORK], [AC_FUNC_VFORK])
# AC_FUNC_VPRINTF
# ---------------
# Why the heck is that _doprnt does not define HAVE__DOPRNT???
# That the logical name!
AC_DEFUN([AC_FUNC_VPRINTF],
[AC_CHECK_FUNCS(vprintf, []
[AC_CHECK_FUNC(_doprnt,
[AC_DEFINE(HAVE_DOPRNT, 1,
[Define if you don't have `vprintf' but do have
`_doprnt.'])])])
])
# AU::AC_VPRINTF
# --------------
AU_ALIAS([AC_VPRINTF], [AC_FUNC_VPRINTF])
# AC_FUNC_WAIT3
# -------------
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. */
int
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: /* What can we do? */
_exit(0);
default: /* Parent. */
wait3(&i, 0, &r);
/* Avoid "text file busy" from rm on fast HP-UX machines. */
sleep(2);
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, 1,
[Define if you have the `wait3' system call.])
fi
])# AC_FUNC_WAIT3
# AU::AC_WAIT3
# ------------
AU_ALIAS([AC_WAIT3], [AC_FUNC_WAIT3])
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