/src/libev/libev.m4

 1dnl this file is part of libev, do not make local modifications
 2dnl http://software.schmorp.de/pkg/libev
 3
 4dnl libev support 
 5AC_CHECK_HEADERS(sys/inotify.h sys/epoll.h sys/event.h port.h poll.h sys/select.h sys/eventfd.h sys/signalfd.h) 
 6 
 7AC_CHECK_FUNCS(inotify_init epoll_ctl kqueue port_create poll select eventfd signalfd)
 8 
 9AC_CHECK_FUNC(clock_gettime, [], [ 
10   dnl on linux, try syscall wrapper first
11   if test $(uname) = Linux; then
12      AC_MSG_CHECKING(for clock_gettime syscall)
13      AC_LINK_IFELSE([AC_LANG_PROGRAM(
14                      [#include <unistd.h>
15                       #include <sys/syscall.h>
16                       #include <time.h>],
17                      [struct timespec ts; int status = syscall (SYS_clock_gettime, CLOCK_REALTIME, &ts)])],
18                     [ac_have_clock_syscall=1
19                      AC_DEFINE(HAVE_CLOCK_SYSCALL, 1, "use syscall interface for clock_gettime")
20                      AC_MSG_RESULT(yes)],
21                     [AC_MSG_RESULT(no)])
22   fi
23   if test -z "$LIBEV_M4_AVOID_LIBRT" && test -z "$ac_have_clock_syscall"; then
24      AC_CHECK_LIB(rt, clock_gettime) 
25      unset ac_cv_func_clock_gettime
26      AC_CHECK_FUNCS(clock_gettime)
27   fi
28])
29
30AC_CHECK_FUNC(nanosleep, [], [ 
31   if test -z "$LIBEV_M4_AVOID_LIBRT"; then
32      AC_CHECK_LIB(rt, nanosleep) 
33      unset ac_cv_func_nanosleep
34      AC_CHECK_FUNCS(nanosleep)
35   fi
36])
37
38AC_CHECK_LIB(m, ceil)
39