c1e5c4bd9d3adea7155dfc3b5e964c06842a103d
1 dnl Helper Functions for the RRDtool configure.ac script
2 dnl
3 dnl this file gets included into aclocal.m4 when runnning aclocal
4 dnl
5 dnl
6 dnl
7 dnl Check for the presence of a particular library and its header files
8 dnl if this check fails set the environment variable EX_CHECK_ALL_ERR to YES
9 dnl and prints out a helful message
10 dnl
11 dnl
12 dnl EX_CHECK_ALL(library, function, header, pkgconf name, tested-version, homepage, cppflags)
13 dnl $1 $2 $3 $4 $5 $6 $7
14 dnl
15 dnl
16 AC_DEFUN([EX_CHECK_ALL],
17 [
18 AC_LANG_PUSH(C)
19 EX_CHECK_STATE=NO
20 ex_check_save_LIBS=${LIBS}
21 ex_check_save_CPPFLAGS=${CPPFLAGS}
22 ex_check_save_LDFLAGS=${LDFLAGS}
23 if test "x$7" != "x"; then
24 CPPFLAGS="$CPPFLAGS -I$7"
25 fi
26 dnl try compiling naked first
27 AC_CHECK_LIB($1,$2, [
28 AC_CHECK_HEADER($3,[LIBS="-l$1 ${LIBS}";EX_CHECK_STATE=YES],[])],[])
29 if test $EX_CHECK_STATE = NO; then
30 dnl now asking pkg-config for help
31 AC_CHECK_PROGS(PKGCONFIG,[pkg-config],no)
32 if test "$PKGCONFIG" != "no"; then
33 if $PKGCONFIG --exists $4; then
34 CPPFLAGS=${CPPFLAGS}" "`$PKGCONFIG --cflags $4`
35 LDFLAGS=${LDFLAGS}" "`$PKGCONFIG --libs-only-L $4`
36 LDFLAGS=${LDFLAGS}" "`$PKGCONFIG --libs-only-other $4`
37 LIBS=${LIBS}" "`$PKGCONFIG --libs-only-l $4`
38 dnl remove the cached value and test again
39 unset ac_cv_lib_`echo $1 | sed ['s/[^_a-zA-Z0-9]/_/g;s/^[0-9]/_/']`_$2
40 AC_CHECK_LIB($1,$2,[
41 unset ac_cv_header_`echo $3 | sed ['s/[^_a-zA-Z0-9]/_/g;s/^[0-9]/_/']`
42 AC_CHECK_HEADER($3,[EX_CHECK_STATE=YES],[])
43 ],[])
44 else
45 AC_MSG_WARN([
46 ----------------------------------------------------------------------------
47 * I found a copy of pkgconfig, but there is no $4.pc file around.
48 You may want to set the PKG_CONFIG_PATH variable to point to its
49 location.
50 ----------------------------------------------------------------------------
51 ])
52 fi
53 fi
54 fi
56 if test ${EX_CHECK_STATE} = NO; then
57 AC_MSG_WARN([
58 ----------------------------------------------------------------------------
59 * I could not find a working copy of $4. Check config.log for hints on why
60 this is the case. Maybe you need to set LDFLAGS and CPPFLAGS appropriately
61 so that compiler and the linker can find lib$1 and its header files. If
62 you have not installed $4, you can get it either from its original home on
64 $6
66 You can find also find an archive copy on
68 http://oss.oetiker.ch/rrdtool/pub/libs
70 The last tested version of $4 is $5.
72 LIBS=$LIBS
73 LDFLAGS=$LDFLAGS
74 CPPFLAGS=$CPPFLAGS
76 ----------------------------------------------------------------------------
77 ])
78 EX_CHECK_ALL_ERR=YES
79 LIBS="${ex_check_save_LIBS}"
80 CPPFLAGS="${ex_check_save_CPPFLAGS}"
81 LDFLAGS="${ex_check_save_LDFLAGS}"
82 fi
83 AC_LANG_POP(C)
84 ]
85 )
87 dnl
88 dnl Ptherad check from http://autoconf-archive.cryp.to/acx_pthread.m4
89 dnl
90 dnl @synopsis ACX_PTHREAD([ACTION-IF-FOUND[, ACTION-IF-NOT-FOUND]])
91 dnl
92 dnl This macro figures out how to build C programs using POSIX threads.
93 dnl It sets the PTHREAD_LIBS output variable to the threads library and
94 dnl linker flags, and the PTHREAD_CFLAGS output variable to any special
95 dnl C compiler flags that are needed. (The user can also force certain
96 dnl compiler flags/libs to be tested by setting these environment
97 dnl variables.)
98 dnl
99 dnl Also sets PTHREAD_CC to any special C compiler that is needed for
100 dnl multi-threaded programs (defaults to the value of CC otherwise).
101 dnl (This is necessary on AIX to use the special cc_r compiler alias.)
102 dnl
103 dnl NOTE: You are assumed to not only compile your program with these
104 dnl flags, but also link it with them as well. e.g. you should link
105 dnl with $PTHREAD_CC $CFLAGS $PTHREAD_CFLAGS $LDFLAGS ... $PTHREAD_LIBS
106 dnl $LIBS
107 dnl
108 dnl If you are only building threads programs, you may wish to use
109 dnl these variables in your default LIBS, CFLAGS, and CC:
110 dnl
111 dnl LIBS="$PTHREAD_LIBS $LIBS"
112 dnl CFLAGS="$CFLAGS $PTHREAD_CFLAGS"
113 dnl CC="$PTHREAD_CC"
114 dnl
115 dnl In addition, if the PTHREAD_CREATE_JOINABLE thread-attribute
116 dnl constant has a nonstandard name, defines PTHREAD_CREATE_JOINABLE to
117 dnl that name (e.g. PTHREAD_CREATE_UNDETACHED on AIX).
118 dnl
119 dnl ACTION-IF-FOUND is a list of shell commands to run if a threads
120 dnl library is found, and ACTION-IF-NOT-FOUND is a list of commands to
121 dnl run it if it is not found. If ACTION-IF-FOUND is not specified, the
122 dnl default action will define HAVE_PTHREAD.
123 dnl
124 dnl Please let the authors know if this macro fails on any platform, or
125 dnl if you have any other suggestions or comments. This macro was based
126 dnl on work by SGJ on autoconf scripts for FFTW (www.fftw.org) (with
127 dnl help from M. Frigo), as well as ac_pthread and hb_pthread macros
128 dnl posted by Alejandro Forero Cuervo to the autoconf macro repository.
129 dnl We are also grateful for the helpful feedback of numerous users.
130 dnl
131 dnl @category InstalledPackages
132 dnl @author Steven G. Johnson <stevenj@alum.mit.edu>
133 dnl @version 2005-01-14
134 dnl @license GPLWithACException
136 AC_DEFUN([ACX_PTHREAD], [
137 AC_REQUIRE([AC_CANONICAL_HOST])
138 AC_LANG_PUSH(C)
139 acx_pthread_ok=no
141 # We used to check for pthread.h first, but this fails if pthread.h
142 # requires special compiler flags (e.g. on True64 or Sequent).
143 # It gets checked for in the link test anyway.
145 # First of all, check if the user has set any of the PTHREAD_LIBS,
146 # etcetera environment variables, and if threads linking works using
147 # them:
148 if test x"$PTHREAD_LIBS$PTHREAD_CFLAGS" != x; then
149 save_CFLAGS="$CFLAGS"
150 CFLAGS="$CFLAGS $PTHREAD_CFLAGS"
151 save_LIBS="$LIBS"
152 LIBS="$PTHREAD_LIBS $LIBS"
153 AC_MSG_CHECKING([for pthread_join in LIBS=$PTHREAD_LIBS with CFLAGS=$PTHREAD_CFLAGS])
154 AC_TRY_LINK_FUNC(pthread_join, acx_pthread_ok=yes)
155 AC_MSG_RESULT($acx_pthread_ok)
156 if test x"$acx_pthread_ok" = xno; then
157 PTHREAD_LIBS=""
158 PTHREAD_CFLAGS=""
159 fi
160 LIBS="$save_LIBS"
161 CFLAGS="$save_CFLAGS"
162 fi
164 # We must check for the threads library under a number of different
165 # names; the ordering is very important because some systems
166 # (e.g. DEC) have both -lpthread and -lpthreads, where one of the
167 # libraries is broken (non-POSIX).
169 # Create a list of thread flags to try. Items starting with a "-" are
170 # C compiler flags, and other items are library names, except for "none"
171 # which indicates that we try without any flags at all, and "pthread-config"
172 # which is a program returning the flags for the Pth emulation library.
174 acx_pthread_flags="pthreads none -Kthread -kthread lthread -pthread -pthreads -mthreads pthread --thread-safe -mt pthread-config"
176 # The ordering *is* (sometimes) important. Some notes on the
177 # individual items follow:
179 # pthreads: AIX (must check this before -lpthread)
180 # none: in case threads are in libc; should be tried before -Kthread and
181 # other compiler flags to prevent continual compiler warnings
182 # -Kthread: Sequent (threads in libc, but -Kthread needed for pthread.h)
183 # -kthread: FreeBSD kernel threads (preferred to -pthread since SMP-able)
184 # lthread: LinuxThreads port on FreeBSD (also preferred to -pthread)
185 # -pthread: Linux/gcc (kernel threads), BSD/gcc (userland threads)
186 # -pthreads: Solaris/gcc
187 # -mthreads: Mingw32/gcc, Lynx/gcc
188 # -mt: Sun Workshop C (may only link SunOS threads [-lthread], but it
189 # doesn't hurt to check since this sometimes defines pthreads too;
190 # also defines -D_REENTRANT)
191 # pthread: Linux, etcetera
192 # --thread-safe: KAI C++
193 # pthread-config: use pthread-config program (for GNU Pth library)
195 case "${host_cpu}-${host_os}" in
196 *solaris*)
198 # On Solaris (at least, for some versions), libc contains stubbed
199 # (non-functional) versions of the pthreads routines, so link-based
200 # tests will erroneously succeed. (We need to link with -pthread or
201 # -lpthread.) (The stubs are missing pthread_cleanup_push, or rather
202 # a function called by this macro, so we could check for that, but
203 # who knows whether they'll stub that too in a future libc.) So,
204 # we'll just look for -pthreads and -lpthread first:
206 acx_pthread_flags="-pthread -pthreads pthread -mt $acx_pthread_flags"
207 ;;
208 esac
210 if test x"$acx_pthread_ok" = xno; then
211 for flag in $acx_pthread_flags; do
213 case $flag in
214 none)
215 AC_MSG_CHECKING([whether pthreads work without any flags])
216 ;;
218 -*)
219 AC_MSG_CHECKING([whether pthreads work with $flag])
220 PTHREAD_CFLAGS="$flag"
221 ;;
223 pthread-config)
224 AC_CHECK_PROG(acx_pthread_config, pthread-config, yes, no)
225 if test x"$acx_pthread_config" = xno; then continue; fi
226 PTHREAD_CFLAGS="`pthread-config --cflags`"
227 PTHREAD_LIBS="`pthread-config --ldflags` `pthread-config --libs`"
228 ;;
230 *)
231 AC_MSG_CHECKING([for the pthreads library -l$flag])
232 PTHREAD_LIBS="-l$flag"
233 ;;
234 esac
236 save_LIBS="$LIBS"
237 save_CFLAGS="$CFLAGS"
238 LIBS="$PTHREAD_LIBS $LIBS"
239 CFLAGS="$CFLAGS $PTHREAD_CFLAGS"
241 # Check for various functions. We must include pthread.h,
242 # since some functions may be macros. (On the Sequent, we
243 # need a special flag -Kthread to make this header compile.)
244 # We check for pthread_join because it is in -lpthread on IRIX
245 # while pthread_create is in libc. We check for pthread_attr_init
246 # due to DEC craziness with -lpthreads. We check for
247 # pthread_cleanup_push because it is one of the few pthread
248 # functions on Solaris that doesn't have a non-functional libc stub.
249 # We try pthread_create on general principles.
250 AC_LINK_IFELSE([AC_LANG_PROGRAM([[#include <pthread.h>]], [[pthread_t th; pthread_join(th, 0);
251 pthread_attr_init(0); pthread_cleanup_push(0, 0);
252 pthread_create(0,0,0,0); pthread_cleanup_pop(0); ]])],[acx_pthread_ok=yes],[])
254 LIBS="$save_LIBS"
255 CFLAGS="$save_CFLAGS"
257 AC_MSG_RESULT($acx_pthread_ok)
258 if test "x$acx_pthread_ok" = xyes; then
259 break;
260 fi
262 PTHREAD_LIBS=""
263 PTHREAD_CFLAGS=""
264 done
265 fi
267 # Various other checks:
268 if test "x$acx_pthread_ok" = xyes; then
269 save_LIBS="$LIBS"
270 LIBS="$PTHREAD_LIBS $LIBS"
271 save_CFLAGS="$CFLAGS"
272 CFLAGS="$CFLAGS $PTHREAD_CFLAGS"
274 # Detect AIX lossage: JOINABLE attribute is called UNDETACHED.
275 AC_MSG_CHECKING([for joinable pthread attribute])
276 attr_name=unknown
277 for attr in PTHREAD_CREATE_JOINABLE PTHREAD_CREATE_UNDETACHED; do
278 AC_LINK_IFELSE([AC_LANG_PROGRAM([[#include <pthread.h>]], [[int attr=$attr;]])],[attr_name=$attr; break],[])
279 done
280 AC_MSG_RESULT($attr_name)
281 if test "$attr_name" != PTHREAD_CREATE_JOINABLE; then
282 AC_DEFINE_UNQUOTED(PTHREAD_CREATE_JOINABLE, $attr_name,
283 [Define to necessary symbol if this constant
284 uses a non-standard name on your system.])
285 fi
287 AC_MSG_CHECKING([if more special flags are required for pthreads])
288 x_rflag=no
289 case "${host_cpu}-${host_os}" in
290 *-aix* | *-freebsd* | *-darwin*) x_rflag="-D_THREAD_SAFE";;
291 *solaris* | *-osf* | *-hpux*) x_rflag="-D_REENTRANT";;
292 *-linux* | *-k*bsd*-gnu*)
293 if test x"$PTHREAD_CFLAGS" = "x-pthread"; then
294 # For Linux/gcc "-pthread" implies "-lpthread". We need, however, to make this explicit
295 # in PTHREAD_LIBS such that a shared library to be built properly depends on libpthread.
296 PTHREAD_LIBS="-lpthread $PTHREAD_LIBS"
297 fi;;
298 esac
299 AC_MSG_RESULT(${x_rflag})
300 if test "x$x_rflag" != xno; then
301 PTHREAD_CFLAGS="$x_rflag $PTHREAD_CFLAGS"
302 fi
304 LIBS="$save_LIBS"
305 CFLAGS="$save_CFLAGS"
307 # More AIX lossage: must compile with cc_r
308 AC_CHECK_PROG(PTHREAD_CC, cc_r, cc_r, ${CC})
309 else
310 PTHREAD_CC="$CC"
311 fi
313 AC_SUBST(PTHREAD_LIBS)
314 AC_SUBST(PTHREAD_CFLAGS)
315 AC_SUBST(PTHREAD_CC)
317 # Finally, execute ACTION-IF-FOUND/ACTION-IF-NOT-FOUND:
318 if test x"$acx_pthread_ok" = xyes; then
319 ifelse([$1],,AC_DEFINE(HAVE_PTHREAD,1,[Define if you have POSIX threads libraries and header files.]),[$1])
320 :
321 else
322 acx_pthread_ok=no
323 $2
324 fi
325 AC_LANG_POP(C)
326 ])dnl ACX_PTHREAD
329 dnl
330 dnl determine how to get IEEE math working
331 dnl AC_IEEE(MESSAGE, set rd_cv_ieee_[var] variable, INCLUDES,
332 dnl FUNCTION-BODY, [ACTION-IF-FOUND [,ACTION-IF-NOT-FOUND]])
333 dnl
335 dnl substitute them in all the files listed in AC_OUTPUT
336 AC_SUBST(PERLFLAGS)
338 AC_DEFUN([AC_IEEE], [
339 AC_MSG_CHECKING([if IEEE math works $1])
340 AC_CACHE_VAL([rd_cv_ieee_$2],
341 [AC_RUN_IFELSE([AC_LANG_SOURCE([[$3
343 #if HAVE_MATH_H
344 # include <math.h>
345 #endif
347 #if HAVE_FLOAT_H
348 # include <float.h>
349 #endif
351 #if HAVE_IEEEFP_H
352 # include <ieeefp.h>
353 #endif
355 #if HAVE_FP_CLASS_H
356 # include <fp_class.h>
357 #endif
359 /* Solaris */
360 #if (! defined(HAVE_ISINF) && defined(HAVE_FPCLASS))
361 # define HAVE_ISINF 1
362 # define isinf(a) (fpclass(a) == FP_NINF || fpclass(a) == FP_PINF)
363 #endif
365 /* solaris 10 it defines isnan such that only forte can compile it ... bad bad */
366 #if (defined(HAVE_ISNAN) && defined(isnan) && defined(HAVE_FPCLASS))
367 # undef isnan
368 # define isnan(a) (fpclass(a) == FP_SNAN || fpclass(a) == FP_QNAN)
369 #endif
371 /* Digital UNIX */
372 #if (! defined(HAVE_ISINF) && defined(HAVE_FP_CLASS) && defined(HAVE_FP_CLASS_H))
373 # define HAVE_ISINF 1
374 # define isinf(a) (fp_class(a) == FP_NEG_INF || fp_class(a) == FP_POS_INF)
375 #endif
377 /* AIX */
378 #if (! defined(HAVE_ISINF) && defined(HAVE_CLASS))
379 # define HAVE_ISINF 1
380 # define isinf(a) (class(a) == FP_MINUS_INF || class(a) == FP_PLUS_INF)
381 #endif
383 #if (! defined(HAVE_ISINF) && defined(HAVE_FPCLASSIFY) && defined(FP_PLUS_INF) && defined(FP_MINUS_INF))
384 # define HAVE_ISINF 1
385 # define isinf(a) (fpclassify(a) == FP_MINUS_INF || fpclassify(a) == FP_PLUS_INF)
386 #endif
388 #if (! defined(HAVE_ISINF) && defined(HAVE_FPCLASSIFY) && defined(FP_INFINITE))
389 # define HAVE_ISINF 1
390 # define isinf(a) (fpclassify(a) == FP_INFINITE)
391 #endif
393 #if HAVE_MATH_H
394 #include <math.h>
395 #endif
397 #include <stdio.h>
398 int main(void){
399 double rrdnan,rrdinf,rrdc,rrdzero;
400 $4;
401 /* some math to see if we get a floating point exception */
402 rrdzero=sin(0.0); /* don't let the compiler optimize us away */
403 rrdnan=0.0/rrdzero; /* especially here */
404 rrdinf=1.0/rrdzero; /* and here. I want to know if it can do the magic */
405 /* at run time without sig fpe */
406 rrdc = rrdinf + rrdnan;
407 rrdc = rrdinf / rrdnan;
408 if (! isnan(rrdnan)) {printf ("not isnan(NaN) ... "); return 1;}
409 if (rrdnan == rrdnan) {printf ("nan == nan ... "); return 1;}
410 if (! isinf(rrdinf)) {printf ("not isinf(oo) ... "); return 1;}
411 if (! isinf(-rrdinf)) {printf ("not isinf(-oo) ... "); return 1;}
412 if (! rrdinf > 0) {printf ("not inf > 0 ... "); return 1;}
413 if (! -rrdinf < 0) {printf ("not -inf < 0 ... "); return 1;}
414 return 0;
415 }]])],[rd_cv_ieee_$2=yes],[rd_cv_ieee_$2=no],[:])])
416 dnl these we run regardles is cached or not
417 if test x${rd_cv_ieee_$2} = "xyes"; then
418 AC_MSG_RESULT(yes)
419 $5
420 else
421 AC_MSG_RESULT(no)
422 $6
423 fi
425 ])
427 AC_DEFUN([AC_FULL_IEEE],[
428 AC_LANG_PUSH(C)
429 _cflags=${CFLAGS}
430 AC_IEEE([out of the box], works, , , ,
431 [CFLAGS="$_cflags -ieee"
432 AC_IEEE([with the -ieee switch], switch, , , ,
433 [CFLAGS="$_cflags -qfloat=nofold"
434 AC_IEEE([with the -qfloat=nofold switch], nofold, , , ,
435 [CFLAGS="$_cflags -w -qflttrap=enable:zerodivide"
436 AC_IEEE([with the -w -qflttrap=enable:zerodivide], flttrap, , , ,
437 [CFLAGS="$_cflags -mieee"
438 AC_IEEE([with the -mieee switch], mswitch, , , ,
439 [CFLAGS="$_cflags -q float=rndsngl"
440 AC_IEEE([with the -q float=rndsngl switch], qswitch, , , ,
441 [CFLAGS="$_cflags -OPT:IEEE_NaN_inf=ON"
442 AC_IEEE([with the -OPT:IEEE_NaN_inf=ON switch], ieeenaninfswitch, , , ,
443 [CFLAGS="$_cflags -OPT:IEEE_comparisons=ON"
444 AC_IEEE([with the -OPT:IEEE_comparisons=ON switch], ieeecmpswitch, , , ,
445 [CFLAGS=$_cflags
446 AC_IEEE([with fpsetmask(0)], mask,
447 [#include <floatingpoint.h>], [fpsetmask(0)],
448 [AC_DEFINE(MUST_DISABLE_FPMASK)
449 PERLFLAGS="CCFLAGS=-DMUST_DISABLE_FPMASK"],
450 [AC_IEEE([with signal(SIGFPE,SIG_IGN)], sigfpe,
451 [#include <signal.h>], [signal(SIGFPE,SIG_IGN)],
452 [AC_DEFINE(MUST_DISABLE_SIGFPE)
453 PERLFLAGS="CCFLAGS=-DMUST_DISABLE_SIGFPE"],
454 AC_MSG_ERROR([
455 Your Compiler does not do propper IEEE math ... Please find out how to
456 make IEEE math work with your compiler and let me know (tobi@oetiker.ch).
457 Check config.log to see what went wrong ...
458 ]))])])])])])])])])])
460 AC_LANG_POP(C)
462 ])
465 dnl a macro to check for ability to create python extensions
466 dnl AM_CHECK_PYTHON_HEADERS([ACTION-IF-POSSIBLE], [ACTION-IF-NOT-POSSIBLE])
467 dnl function also defines PYTHON_INCLUDES
468 AC_DEFUN([AM_CHECK_PYTHON_HEADERS],
469 [AC_REQUIRE([AM_PATH_PYTHON])
470 AC_MSG_CHECKING(for headers required to compile python extensions)
471 dnl deduce PYTHON_INCLUDES
472 py_prefix=`$PYTHON -c "import sys; print sys.prefix"`
473 py_exec_prefix=`$PYTHON -c "import sys; print sys.exec_prefix"`
474 PYTHON_INCLUDES="-I${py_prefix}/include/python${PYTHON_VERSION}"
475 if test "$py_prefix" != "$py_exec_prefix"; then
476 PYTHON_INCLUDES="$PYTHON_INCLUDES -I${py_exec_prefix}/include/python${PYTHON_VERSION}"
477 fi
478 AC_SUBST(PYTHON_INCLUDES)
479 dnl check if the headers exist:
480 save_CPPFLAGS="$CPPFLAGS"
481 CPPFLAGS="$CPPFLAGS $PYTHON_INCLUDES"
482 AC_TRY_CPP([#include <Python.h>],dnl
483 [AC_MSG_RESULT(found)
484 $1],dnl
485 [AC_MSG_RESULT(not found)
486 $2])
487 CPPFLAGS="$save_CPPFLAGS"
488 ])
490 dnl a macro to add some color to the build process.
491 dnl CONFIGURE_PART(MESSAGE)
493 AC_DEFUN([CONFIGURE_PART],[
494 case $TERM in
495 # for the most important terminal types we directly know the sequences
496 xterm|xterm*|vt220|vt220*)
497 T_MD=`awk 'BEGIN { printf("%c%c%c%c", 27, 91, 49, 109); }' </dev/null 2>/dev/null`
498 T_ME=`awk 'BEGIN { printf("%c%c%c", 27, 91, 109); }' </dev/null 2>/dev/null`
499 ;;
500 vt100|vt100*|cygwin)
501 T_MD=`awk 'BEGIN { printf("%c%c%c%c%c%c", 27, 91, 49, 109, 0, 0); }' </dev/null 2>/dev/null`
502 T_ME=`awk 'BEGIN { printf("%c%c%c%c%c", 27, 91, 109, 0, 0); }' </dev/null 2>/dev/null`
503 ;;
504 *)
505 T_MD=''
506 T_ME=''
507 ;;
508 esac
509 AC_MSG_RESULT()
510 AC_MSG_RESULT([${T_MD}$1${T_ME}])
511 ])
513 dnl check
515 AC_DEFUN([CHECK_FOR_WORKING_MS_ASYNC], [
516 AC_MSG_CHECKING([if msync with MS_ASYNC updates the files mtime])
517 AC_CACHE_VAL([rd_cv_ms_async],
518 [AC_RUN_IFELSE([AC_LANG_SOURCE([[
519 #include <fcntl.h>
520 #include <sys/types.h>
521 #include <sys/stat.h>
522 #include <unistd.h>
523 #include <stdio.h>
524 #include <sys/mman.h>
525 #include <stdlib.h>
526 #include <utime.h>
527 int main(void){
528 int fd;
529 struct stat stbuf;
530 char *addr;
531 int res;
532 char temp[] = "mmaptestXXXXXX";
533 struct utimbuf newtime;
535 time_t create_ts;
536 fd = mkstemp(temp);
537 if (fd == -1){
538 perror(temp);
539 return 1;
540 }
541 write(fd,"12345\n", 6);
542 stat(temp, &stbuf);
543 create_ts = stbuf.st_mtime;
544 newtime.actime = 0;
545 newtime.modtime = 0;
546 utime(temp,&newtime);
547 addr = mmap(NULL, 4096, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
548 if (addr == MAP_FAILED) {
549 perror("mmap");
550 goto bad_exit;
551 }
552 addr[0]='x';
553 res = msync(addr, 4, MS_ASYNC);
554 if (res == -1) {
555 perror("msync");
556 goto bad_exit;
557 }
558 res = close(fd);
559 if (res == -1) {
560 perror("close");
561 goto bad_exit;
562 }
563 /* The ASYNC means that we schedule the msync and return immediately.
564 Since we want to see if the modification time is updated upon
565 msync(), we have to make sure that our asynchronous request
566 completes before we stat below. In a real application, the
567 request would be completed at a random time in the future
568 but for this test we do not want to wait an arbitrary amount of
569 time, so force a commit now. */
570 sync();
571 stat(temp, &stbuf);
572 if (create_ts > stbuf.st_mtime){
573 goto bad_exit;
574 }
575 unlink(temp);
576 return 0;
577 bad_exit:
578 unlink(temp);
579 return 1;
580 }
581 ]])],[rd_cv_ms_async=ok],[rd_cv_ms_async=broken],[:])])
584 if test "${rd_cv_ms_async}" = "ok"; then
585 AC_MSG_RESULT(yes)
586 else
587 AC_DEFINE_UNQUOTED(HAVE_BROKEN_MS_ASYNC, 1 , [set to 1 if msync with MS_ASYNC fails to update mtime])
588 AC_MSG_RESULT(no)
589 AC_MSG_WARN([With mmap access, your platform fails to update the files])
590 AC_MSG_WARN([mtime. RRDtool will work around this problem by calling utime on each])
591 AC_MSG_WARN([file it opens for rw access.])
592 sleep 2
593 fi
595 ])