[ViewVC] Diff of: cvs/libev/libev.m4

Comparing libev/libev.m4 (file contents):
Revision 1.9 by root, Sat Dec 22 17:28:20 2007 UTC vs.
Revision 1.13 by root, Tue Mar 16 00:43:22 2010 UTC

 dnl this file is part of libev, do not make local modifications
 dnl http://software.schmorp.de/pkg/libev
 dnl libev support
-AC_CHECK_HEADERS(sys/inotify.h sys/epoll.h sys/event.h sys/queue.h port.h poll.h sys/select.h)
+AC_CHECK_HEADERS(sys/inotify.h sys/epoll.h sys/event.h port.h poll.h sys/select.h sys/eventfd.h sys/signalfd.h)
-AC_CHECK_FUNCS(inotify_init epoll_ctl kqueue port_create poll select)
+AC_CHECK_FUNCS(inotify_init epoll_ctl kqueue port_create poll select eventfd signalfd)
 AC_CHECK_FUNC(clock_gettime, [], [
-   if test -z "$LIBEV_M4_AVOID_LIBRT"; then
+   dnl on linux, try syscall wrapper first
+   if test $(uname) = Linux; then
+      AC_MSG_CHECKING(for clock_gettime syscall)
+      AC_LINK_IFELSE([AC_LANG_PROGRAM(
+                      [#include <unistd.h>
+                       #include <sys/syscall.h>
+                       #include <time.h>],
+                      [struct timespec ts; int status = syscall (SYS_clock_gettime, CLOCK_REALTIME, &ts)])],
+                     [ac_have_clock_syscall=1
+                      AC_DEFINE(HAVE_CLOCK_SYSCALL, 1, "use syscall interface for clock_gettime")
+                      AC_MSG_RESULT(yes)],
+                     [AC_MSG_RESULT(no)])
+   fi
+   if test -z "$LIBEV_M4_AVOID_LIBRT" && test -z "$ac_have_clock_syscall"; then
       AC_CHECK_LIB(rt, clock_gettime)
       unset ac_cv_func_clock_gettime
       AC_CHECK_FUNCS(clock_gettime)
    fi
 ])
    fi
 ])
 AC_CHECK_LIB(m, ceil)

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