forked from Green-Sky/tomato
Green Sky
227425b90e
git-subtree-dir: external/toxcore/c-toxcore git-subtree-split: 67badf69416a74e74f6d7eb51dd96f37282b8455
105 lines
3.5 KiB
Plaintext
105 lines
3.5 KiB
Plaintext
# ===========================================================================
|
|
# http://www.gnu.org/software/autoconf-archive/ax_have_epoll.html
|
|
# ===========================================================================
|
|
#
|
|
# SYNOPSIS
|
|
#
|
|
# AX_HAVE_EPOLL([ACTION-IF-FOUND], [ACTION-IF-NOT-FOUND])
|
|
# AX_HAVE_EPOLL_PWAIT([ACTION-IF-FOUND], [ACTION-IF-NOT-FOUND])
|
|
#
|
|
# DESCRIPTION
|
|
#
|
|
# This macro determines whether the system supports the epoll I/O event
|
|
# interface. A neat usage example would be:
|
|
#
|
|
# AX_HAVE_EPOLL(
|
|
# [AX_CONFIG_FEATURE_ENABLE(epoll)],
|
|
# [AX_CONFIG_FEATURE_DISABLE(epoll)])
|
|
# AX_CONFIG_FEATURE(
|
|
# [epoll], [This platform supports epoll(7)],
|
|
# [HAVE_EPOLL], [This platform supports epoll(7).])
|
|
#
|
|
# The epoll interface was added to the Linux kernel in version 2.5.45, and
|
|
# the macro verifies that a kernel newer than this is installed. This
|
|
# check is somewhat unreliable if <linux/version.h> doesn't match the
|
|
# running kernel, but it is necessary regardless, because glibc comes with
|
|
# stubs for the epoll_create(), epoll_wait(), etc. that allow programs to
|
|
# compile and link even if the kernel is too old; the problem would then
|
|
# be detected only at runtime.
|
|
#
|
|
# Linux kernel version 2.6.19 adds the epoll_pwait() call in addition to
|
|
# epoll_wait(). The availability of that function can be tested with the
|
|
# second macro. Generally speaking, it is safe to assume that
|
|
# AX_HAVE_EPOLL would succeed if AX_HAVE_EPOLL_PWAIT has, but not the
|
|
# other way round.
|
|
#
|
|
# LICENSE
|
|
#
|
|
# Copyright (c) 2008 Peter Simons <simons@cryp.to>
|
|
#
|
|
# Copying and distribution of this file, with or without modification, are
|
|
# permitted in any medium without royalty provided the copyright notice
|
|
# and this notice are preserved. This file is offered as-is, without any
|
|
# warranty.
|
|
|
|
#serial 10
|
|
|
|
AC_DEFUN([AX_HAVE_EPOLL], [dnl
|
|
ax_have_epoll_cppflags="${CPPFLAGS}"
|
|
AC_CHECK_HEADER([linux/version.h], [CPPFLAGS="${CPPFLAGS} -DHAVE_LINUX_VERSION_H"])
|
|
AC_MSG_CHECKING([for Linux epoll(7) interface])
|
|
AC_CACHE_VAL([ax_cv_have_epoll], [dnl
|
|
AC_LINK_IFELSE([dnl
|
|
AC_LANG_PROGRAM([dnl
|
|
#include <sys/epoll.h>
|
|
#ifdef HAVE_LINUX_VERSION_H
|
|
# include <linux/version.h>
|
|
# if LINUX_VERSION_CODE < KERNEL_VERSION(2,5,45)
|
|
# error linux kernel version is too old to have epoll
|
|
# endif
|
|
#endif
|
|
], [dnl
|
|
int fd, rc;
|
|
struct epoll_event ev;
|
|
fd = epoll_create(128);
|
|
rc = epoll_wait(fd, &ev, 1, 0);])],
|
|
[ax_cv_have_epoll=yes],
|
|
[ax_cv_have_epoll=no])])
|
|
CPPFLAGS="${ax_have_epoll_cppflags}"
|
|
AS_IF([test "${ax_cv_have_epoll}" = "yes"],
|
|
[AC_MSG_RESULT([yes])
|
|
$1],[AC_MSG_RESULT([no])
|
|
$2])
|
|
])dnl
|
|
|
|
AC_DEFUN([AX_HAVE_EPOLL_PWAIT], [dnl
|
|
ax_have_epoll_cppflags="${CPPFLAGS}"
|
|
AC_CHECK_HEADER([linux/version.h],
|
|
[CPPFLAGS="${CPPFLAGS} -DHAVE_LINUX_VERSION_H"])
|
|
AC_MSG_CHECKING([for Linux epoll(7) interface with signals extension])
|
|
AC_CACHE_VAL([ax_cv_have_epoll_pwait], [dnl
|
|
AC_LINK_IFELSE([dnl
|
|
AC_LANG_PROGRAM([dnl
|
|
#ifdef HAVE_LINUX_VERSION_H
|
|
# include <linux/version.h>
|
|
# if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,19)
|
|
# error linux kernel version is too old to have epoll_pwait
|
|
# endif
|
|
#endif
|
|
#include <sys/epoll.h>
|
|
#include <signal.h>
|
|
], [dnl
|
|
int fd, rc;
|
|
struct epoll_event ev;
|
|
fd = epoll_create(128);
|
|
rc = epoll_wait(fd, &ev, 1, 0);
|
|
rc = epoll_pwait(fd, &ev, 1, 0, (sigset_t const *)(0));])],
|
|
[ax_cv_have_epoll_pwait=yes],
|
|
[ax_cv_have_epoll_pwait=no])])
|
|
CPPFLAGS="${ax_have_epoll_cppflags}"
|
|
AS_IF([test "${ax_cv_have_epoll_pwait}" = "yes"],
|
|
[AC_MSG_RESULT([yes])
|
|
$1],[AC_MSG_RESULT([no])
|
|
$2])
|
|
])dnl
|