Use monotonic clock to time out waiting for a reply

If clock_gettime(CLOCK_MONOTONIC,) is supported then use that and all should
be well. If it's not then at least work around hanging until next ping.

1 files changed, 184 insertions, 5 deletions

diff --git a/configure b/configure
index b9bdb6e..9dc2afd 100755
--- a/configure
+++ b/configure
@@ -709,6 +709,8 @@ CPP
 GREP
 EGREP
 LIBOBJS
+HAVE_CLOCK_MONOTONIC_TRUE
+HAVE_CLOCK_MONOTONIC_FALSE
 LTLIBOBJS'
 ac_subst_files=''
       ac_precious_vars='build_alias
@@ -3944,6 +3946,89 @@ echo "$as_me: error: libpcap not found" >&2;}
    { (exit 1); exit 1; }; }
 fi
 
+{ echo "$as_me:$LINENO: checking for library containing clock_gettime" >&5
+echo $ECHO_N "checking for library containing clock_gettime... $ECHO_C" >&6; }
+if test "${ac_cv_search_clock_gettime+set}" = set; then
+  echo $ECHO_N "(cached) $ECHO_C" >&6
+else
+  ac_func_search_save_LIBS=$LIBS
+cat >conftest.$ac_ext <<_ACEOF
+/* confdefs.h.  */
+_ACEOF
+cat confdefs.h >>conftest.$ac_ext
+cat >>conftest.$ac_ext <<_ACEOF
+/* end confdefs.h.  */
+
+/* Override any GCC internal prototype to avoid an error.
+   Use char because int might match the return type of a GCC
+   builtin and then its argument prototype would still apply.  */
+#ifdef __cplusplus
+extern "C"
+#endif
+char clock_gettime ();
+int
+main ()
+{
+return clock_gettime ();
+  ;
+  return 0;
+}
+_ACEOF
+for ac_lib in '' rt; do
+  if test -z "$ac_lib"; then
+    ac_res="none required"
+  else
+    ac_res=-l$ac_lib
+    LIBS="-l$ac_lib  $ac_func_search_save_LIBS"
+  fi
+  rm -f conftest.$ac_objext conftest$ac_exeext
+if { (ac_try="$ac_link"
+case "(($ac_try" in
+  *\"* | *\`* | *\\*) ac_try_echo=\$ac_try;;
+  *) ac_try_echo=$ac_try;;
+esac
+eval "echo \"\$as_me:$LINENO: $ac_try_echo\"") >&5
+  (eval "$ac_link") 2>conftest.er1
+  ac_status=$?
+  grep -v '^ *+' conftest.er1 >conftest.err
+  rm -f conftest.er1
+  cat conftest.err >&5
+  echo "$as_me:$LINENO: \$? = $ac_status" >&5
+  (exit $ac_status); } && {
+	 test -z "$ac_c_werror_flag" ||
+	 test ! -s conftest.err
+       } && test -s conftest$ac_exeext &&
+       $as_test_x conftest$ac_exeext; then
+  ac_cv_search_clock_gettime=$ac_res
+else
+  echo "$as_me: failed program was:" >&5
+sed 's/^/| /' conftest.$ac_ext >&5
+
+
+fi
+
+rm -f core conftest.err conftest.$ac_objext conftest_ipa8_conftest.oo \
+      conftest$ac_exeext
+  if test "${ac_cv_search_clock_gettime+set}" = set; then
+  break
+fi
+done
+if test "${ac_cv_search_clock_gettime+set}" = set; then
+  :
+else
+  ac_cv_search_clock_gettime=no
+fi
+rm conftest.$ac_ext
+LIBS=$ac_func_search_save_LIBS
+fi
+{ echo "$as_me:$LINENO: result: $ac_cv_search_clock_gettime" >&5
+echo "${ECHO_T}$ac_cv_search_clock_gettime" >&6; }
+ac_res=$ac_cv_search_clock_gettime
+if test "$ac_res" != no; then
+  test "$ac_res" = "none required" || LIBS="$ac_res $LIBS"
+
+fi
+
 
 # Checks for header files.
 ac_ext=c
@@ -4593,11 +4678,13 @@ done
 
 
 
+
 for ac_header in \
 arpa/inet.h \
 netinet/in.h \
 stdlib.h \
 sys/socket.h \
+time.h \
 sys/time.h \
 sys/types.h \
 stdint.h \
@@ -5941,6 +6028,91 @@ esac
 
           ;;
 esac
+
+
+
+# check for CLOCK_MONOTONIC
+{ echo "$as_me:$LINENO: checking for CLOCK_MONOTONIC" >&5
+echo $ECHO_N "checking for CLOCK_MONOTONIC... $ECHO_C" >&6; }
+if test "${ac_cv_have_clock_monotonic+set}" = set; then
+  echo $ECHO_N "(cached) $ECHO_C" >&6
+else
+
+                                  if test "$cross_compiling" = yes; then
+  { { echo "$as_me:$LINENO: error: cannot run test program while cross compiling
+See \`config.log' for more details." >&5
+echo "$as_me: error: cannot run test program while cross compiling
+See \`config.log' for more details." >&2;}
+   { (exit 1); exit 1; }; }
+else
+  cat >conftest.$ac_ext <<_ACEOF
+/* confdefs.h.  */
+_ACEOF
+cat confdefs.h >>conftest.$ac_ext
+cat >>conftest.$ac_ext <<_ACEOF
+/* end confdefs.h.  */
+
+#include <time.h>
+int main() {
+struct timespec ts;
+exit(!!clock_gettime(CLOCK_MONOTONIC, &ts));
+}
+
+_ACEOF
+rm -f conftest$ac_exeext
+if { (ac_try="$ac_link"
+case "(($ac_try" in
+  *\"* | *\`* | *\\*) ac_try_echo=\$ac_try;;
+  *) ac_try_echo=$ac_try;;
+esac
+eval "echo \"\$as_me:$LINENO: $ac_try_echo\"") >&5
+  (eval "$ac_link") 2>&5
+  ac_status=$?
+  echo "$as_me:$LINENO: \$? = $ac_status" >&5
+  (exit $ac_status); } && { ac_try='./conftest$ac_exeext'
+  { (case "(($ac_try" in
+  *\"* | *\`* | *\\*) ac_try_echo=\$ac_try;;
+  *) ac_try_echo=$ac_try;;
+esac
+eval "echo \"\$as_me:$LINENO: $ac_try_echo\"") >&5
+  (eval "$ac_try") 2>&5
+  ac_status=$?
+  echo "$as_me:$LINENO: \$? = $ac_status" >&5
+  (exit $ac_status); }; }; then
+   ac_cv_have_clock_monotonic="yes"
+else
+  echo "$as_me: program exited with status $ac_status" >&5
+echo "$as_me: failed program was:" >&5
+sed 's/^/| /' conftest.$ac_ext >&5
+
+( exit $ac_status )
+ ac_cv_have_clock_monotonic="no"
+
+fi
+rm -f core *.core core.conftest.* gmon.out bb.out conftest$ac_exeext conftest.$ac_objext conftest.$ac_ext
+fi
+
+
+
+fi
+{ echo "$as_me:$LINENO: result: $ac_cv_have_clock_monotonic" >&5
+echo "${ECHO_T}$ac_cv_have_clock_monotonic" >&6; }
+ if test x$ac_cv_have_clock_monotonic = xyes; then
+  HAVE_CLOCK_MONOTONIC_TRUE=
+  HAVE_CLOCK_MONOTONIC_FALSE='#'
+else
+  HAVE_CLOCK_MONOTONIC_TRUE='#'
+  HAVE_CLOCK_MONOTONIC_FALSE=
+fi
+
+if test x$ac_cv_have_clock_monotonic = xyes; then
+
+cat >>confdefs.h <<\_ACEOF
+#define HAVE_CLOCK_MONOTONIC 1
+_ACEOF
+
+fi
+
 ac_config_files="$ac_config_files Makefile"
 
 ac_config_files="$ac_config_files src/Makefile"
@@ -6064,6 +6236,13 @@ echo "$as_me: error: conditional \"am__fastdepCC\" was never defined.
 Usually this means the macro was only invoked conditionally." >&2;}
    { (exit 1); exit 1; }; }
 fi
+if test -z "${HAVE_CLOCK_MONOTONIC_TRUE}" && test -z "${HAVE_CLOCK_MONOTONIC_FALSE}"; then
+  { { echo "$as_me:$LINENO: error: conditional \"HAVE_CLOCK_MONOTONIC\" was never defined.
+Usually this means the macro was only invoked conditionally." >&5
+echo "$as_me: error: conditional \"HAVE_CLOCK_MONOTONIC\" was never defined.
+Usually this means the macro was only invoked conditionally." >&2;}
+   { (exit 1); exit 1; }; }
+fi
 
 : ${CONFIG_STATUS=./config.status}
 ac_clean_files_save=$ac_clean_files
@@ -6692,10 +6871,12 @@ CPP!$CPP$ac_delim
 GREP!$GREP$ac_delim
 EGREP!$EGREP$ac_delim
 LIBOBJS!$LIBOBJS$ac_delim
+HAVE_CLOCK_MONOTONIC_TRUE!$HAVE_CLOCK_MONOTONIC_TRUE$ac_delim
+HAVE_CLOCK_MONOTONIC_FALSE!$HAVE_CLOCK_MONOTONIC_FALSE$ac_delim
 LTLIBOBJS!$LTLIBOBJS$ac_delim
 _ACEOF
 
-  if test `sed -n "s/.*$ac_delim\$/X/p" conf$$subs.sed | grep -c X` = 95; then
+  if test `sed -n "s/.*$ac_delim\$/X/p" conf$$subs.sed | grep -c X` = 97; then
     break
   elif $ac_last_try; then
     { { echo "$as_me:$LINENO: error: could not make $CONFIG_STATUS" >&5
@@ -6714,7 +6895,7 @@ fi
 
 cat >>$CONFIG_STATUS <<_ACEOF
 cat >"\$tmp/subs-1.sed" <<\CEOF$ac_eof
-/@[a-zA-Z_][a-zA-Z_0-9]*@/!b end
+/@[a-zA-Z_][a-zA-Z_0-9]*@/!b
 _ACEOF
 sed '
 s/[,\\&]/\\&/g; s/@/@|#_!!_#|/g
@@ -6727,8 +6908,6 @@ N; s/^.*\n//; s/[,\\&]/\\&/g; s/@/@|#_!!_#|/g; b n
 ' >>$CONFIG_STATUS <conf$$subs.sed
 rm -f conf$$subs.sed
 cat >>$CONFIG_STATUS <<_ACEOF
-:end
-s/|#_!!_#|//g
 CEOF$ac_eof
 _ACEOF
 
@@ -6982,7 +7161,7 @@ s&@abs_top_builddir@&$ac_abs_top_builddir&;t t
 s&@INSTALL@&$ac_INSTALL&;t t
 s&@MKDIR_P@&$ac_MKDIR_P&;t t
 $ac_datarootdir_hack
-" $ac_file_inputs | sed -f "$tmp/subs-1.sed" >$tmp/out
+" $ac_file_inputs | sed -f "$tmp/subs-1.sed" | sed 's/|#_!!_#|//g' >$tmp/out
 
 test -z "$ac_datarootdir_hack$ac_datarootdir_seen" &&
   { ac_out=`sed -n '/\${datarootdir}/p' "$tmp/out"`; test -n "$ac_out"; } &&