Update macros from the autoconf archive

[lttng-tools.git] / m4 / epoll.m4

diff --git a/m4/epoll.m4 b/m4/epoll.m4
deleted file mode 100644 (file)
index 6508a20..0000000
--- a/m4/epoll.m4
+++ /dev/null
@@ -1,105 +0,0 @@
-# ===========================================================================
-#       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
-