Changelog for the c-ares project
+* Jul 2 2008 (Yang Tse)
+- Fallback to gettimeofday when monotonic clock is unavailable at run-time.
+
* Jun 30 2008 (Daniel Stenberg)
- As was pointed out to me by Andreas Schuldei, the MAXHOSTNAMELEN define is
o fix adig sample application compilation failure on some systems
o fix pkg-config reporting of private libraries needed for static linking
+ o fallback to gettimeofday when monotonic clock is unavailable at run-time
Thanks go to these friendly people for their efforts and contributions:
AC_DEFUN([CURL_CHECK_FUNC_CLOCK_GETTIME_MONOTONIC], [
AC_REQUIRE([AC_HEADER_TIME])dnl
- AC_CHECK_HEADERS(sys/types.h unistd.h sys/time.h time.h)
- AC_MSG_CHECKING([for POSIX always supported monotonic clock_gettime])
+ AC_CHECK_HEADERS(sys/types.h sys/time.h time.h)
+ AC_MSG_CHECKING([for monotonic clock_gettime])
AC_COMPILE_IFELSE([
AC_LANG_PROGRAM([[
#ifdef HAVE_SYS_TYPES_H
#include <sys/types.h>
#endif
-#ifdef HAVE_UNISTD_H
-#include <unistd.h>
-#endif
#ifdef HAVE_SYS_TIME_H
#include <sys/time.h>
#ifdef TIME_WITH_SYS_TIME
#endif
#endif
]],[[
-#if defined(_POSIX_MONOTONIC_CLOCK) && (_POSIX_MONOTONIC_CLOCK > 0)
- /*
- The monotonic clock will not be used unless the feature test macro is
- defined with a value greater than zero indicating _always_ supported.
- */
struct timespec ts;
(void)clock_gettime(CLOCK_MONOTONIC, &ts);
-#else
- HAVE_CLOCK_GETTIME_MONOTONIC shall not be defined.
-#endif
]])
],[
AC_MSG_RESULT([yes])
AC_MSG_RESULT([no])
ac_cv_func_clock_gettime="no"
])
- dnl Definition of HAVE_CLOCK_GETTIME_MONOTONIC is intentionally
- dnl postponed until library linking checks for clock_gettime pass.
+ dnl Definition of HAVE_CLOCK_GETTIME_MONOTONIC is intentionally postponed
+ dnl until library linking and run-time checks for clock_gettime succeed.
]) dnl AC_DEFUN
#ifdef HAVE_SYS_TYPES_H
#include <sys/types.h>
#endif
-#ifdef HAVE_UNISTD_H
-#include <unistd.h>
-#endif
#ifdef HAVE_SYS_TIME_H
#include <sys/time.h>
#ifdef TIME_WITH_SYS_TIME
#ifdef HAVE_SYS_TYPES_H
#include <sys/types.h>
#endif
-#ifdef HAVE_UNISTD_H
-#include <unistd.h>
-#endif
#ifdef HAVE_SYS_TIME_H
#include <sys/time.h>
#ifdef TIME_WITH_SYS_TIME
#endif
#endif
]],[[
-#if defined(_POSIX_MONOTONIC_CLOCK) && (_POSIX_MONOTONIC_CLOCK > 0)
struct timespec ts;
if (0 == clock_gettime(CLOCK_MONOTONIC, &ts))
exit(0);
-#endif
- exit(1);
+ else
+ exit(1);
]])
],[
AC_MSG_RESULT([yes])
*/
struct timeval now;
struct timespec tsnow;
- (void)clock_gettime(CLOCK_MONOTONIC, &tsnow);
- now.tv_sec = tsnow.tv_sec;
- now.tv_usec = tsnow.tv_nsec / 1000;
+ if(0 == clock_gettime(CLOCK_MONOTONIC, &tsnow)) {
+ now.tv_sec = tsnow.tv_sec;
+ now.tv_usec = tsnow.tv_nsec / 1000;
+ }
+ /*
+ ** Even when the configure process has truly detected monotonic clock
+ ** availability, it might happen that it is not actually available at
+ ** run-time. When this occurs simply fallback to other time source.
+ */
+#ifdef HAVE_GETTIMEOFDAY
+ else
+ (void)gettimeofday(&now, NULL);
+#else
+ else {
+ now.tv_sec = (long)time(NULL);
+ now.tv_usec = 0;
+ }
+#endif
return now;
}