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configure: try to detect whether eventfd is enabled

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eventfd is optional kernel feature, MHD can work just fine without
eventfd enabled.
This commit is contained in:
Evgeny Grin (Karlson2k)
2022-12-23 17:47:01 +03:00
parent 2efc013917
commit 4a169d0cff
1 changed files with 42 additions and 24 deletions
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configure.ac
+42 -24
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@@ -1998,32 +1998,50 @@ AS_CASE([[$enable_itc]],
)
AS_UNSET([[use_itc]])
AS_IF([[test "x$enable_itc" = "xeventfd" || test "x$enable_itc" = "xauto"]], [
AS_VAR_IF([[os_is_native_w32]], [["yes"]], [], [
AC_CHECK_HEADERS([sys/eventfd.h], [], [], [AC_INCLUDES_DEFAULT])
AS_VAR_IF([[ac_cv_header_sys_eventfd_h]], [["yes"]], [
AC_CACHE_CHECK([whether eventfd(2) is usable], [[mhd_cv_eventfd_usable]], [
AC_LINK_IFELSE([
AC_LANG_PROGRAM([[
AS_IF([[test "x$enable_itc" = "xeventfd" || test "x$enable_itc" = "xauto"]],
[
MHD_CHECK_LINK_RUN([[for working eventfd(2)]],[[mhd_cv_eventfd_usable]],[[mhd_cv_eventfd_usable='assuming no']],
[
AC_LANG_SOURCE([[
#include <sys/eventfd.h>
#include <unistd.h>
]], [[
int ef = eventfd(0, EFD_CLOEXEC | EFD_NONBLOCK);
if (ef < 0) return 1;
close (ef);
]])
], [[mhd_cv_eventfd_usable='yes']], [[mhd_cv_eventfd_usable='no']])
])
])
])
AS_VAR_IF([[mhd_cv_eventfd_usable]], [["yes"]], [
use_itc='eventfd'
enable_itc="$use_itc"
AC_DEFINE([[_MHD_ITC_EVENTFD]], [[1]], [Define to use eventFD for inter-thread communication])
], [
AS_VAR_IF([[enable_itc]], [["eventfd"]], [AC_MSG_ERROR([[eventfd(2) is not usable, consider using other type of inter-thread communication]])])
])
])
int main(void)
{
unsigned char buf[8];
int ret;
int efd = eventfd(0, EFD_CLOEXEC | EFD_NONBLOCK);
if (0 > efd)
return 2;
ret = 0;
buf[3] = 1;
if (8 != write(efd, buf, 8))
ret = 3;
else
{
if (8 != read(efd, buf, 8))
ret = 4;
}
close(efd);
return ret;
}
]]
)
],
[
use_itc='eventfd'
enable_itc="$use_itc"
AC_DEFINE([[_MHD_ITC_EVENTFD]], [[1]], [Define to use eventFD for inter-thread communication])
],
[
AS_VAR_IF([[enable_itc]], [["eventfd"]], [AC_MSG_ERROR([[eventfd(2) is not usable, consider using other type of inter-thread communication]])])
]
)
AS_VAR_IF([mhd_cv_eventfd_usable],["assuming no"],
[AC_MSG_WARN([if you have 'eventfd' support enabled on your target system consider overriding test result by "mhd_cv_eventfd_usable=yes" configure parameter])]
)
]
)
AS_IF([[test "x$enable_itc" = "xpipe" || test "x$enable_itc" = "xauto"]], [
AS_VAR_IF([[os_is_native_w32]], [["yes"]], [], [