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Diffstat (limited to 'm4/ax_have_poll.m4')
| -rw-r--r-- | m4/ax_have_poll.m4 | 72 |
1 files changed, 72 insertions, 0 deletions
diff --git a/m4/ax_have_poll.m4 b/m4/ax_have_poll.m4 new file mode 100644 index 0000000..14d3d4b --- /dev/null +++ b/m4/ax_have_poll.m4 @@ -0,0 +1,72 @@ +# =========================================================================== +# http://www.gnu.org/software/autoconf-archive/ax_have_poll.html +# =========================================================================== +# +# SYNOPSIS +# +# AX_HAVE_POLL([ACTION-IF-FOUND], [ACTION-IF-NOT-FOUND]) +# AX_HAVE_PPOLL([ACTION-IF-FOUND], [ACTION-IF-NOT-FOUND]) +# +# DESCRIPTION +# +# This macro determines whether the system supports the poll I/O event +# interface. A neat usage example would be: +# +# AX_HAVE_POLL( +# [AX_CONFIG_FEATURE_ENABLE(poll)], +# [AX_CONFIG_FEATURE_DISABLE(poll)]) +# AX_CONFIG_FEATURE( +# [poll], [This platform supports poll(7)], +# [HAVE_POLL], [This platform supports poll(7).]) +# +# Some systems -- most notably Linux kernel 2.6.16 and later -- also have +# the variant ppoll(). The availability of that function can be tested +# with the second macro. Generally speaking, it is safe to assume that +# AX_HAVE_POLL would succeed if AX_HAVE_PPOLL has, but not the other way +# round. +# +# LICENSE +# +# Copyright (c) 2009 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 7 + +AC_DEFUN([AX_HAVE_POLL], [dnl + AC_MSG_CHECKING([for poll(2)]) + AC_CACHE_VAL([ax_cv_have_poll], [dnl + AC_LINK_IFELSE([dnl + AC_LANG_PROGRAM( + [#include <poll.h>], + [int rc; rc = poll((struct pollfd *)(0), 0, 0);])], + [ax_cv_have_poll=yes], + [ax_cv_have_poll=no])]) + AS_IF([test "${ax_cv_have_poll}" = "yes"], + [AC_MSG_RESULT([yes]) +$1],[AC_MSG_RESULT([no]) +$2]) +])dnl + +AC_DEFUN([AX_HAVE_PPOLL], [dnl + AC_MSG_CHECKING([for ppoll(2)]) + AC_CACHE_VAL([ax_cv_have_ppoll], [dnl + AC_LINK_IFELSE([dnl + AC_LANG_PROGRAM( + [dnl +#include <poll.h> +#include <signal.h>], + [dnl +int rc; +rc = poll((struct pollfd *)(0), 0, 0); +rc = ppoll((struct pollfd *)(0), 0, (struct timespec const *)(0), (sigset_t const *)(0));])], + [ax_cv_have_ppoll=yes], + [ax_cv_have_ppoll=no])]) + AS_IF([test "${ax_cv_have_ppoll}" = "yes"], + [AC_MSG_RESULT([yes]) +$1],[AC_MSG_RESULT([no]) +$2]) +]) |