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5afab0e5e5
Merge commit 'cf3e3d5bd0a1fae39c74c7db5a4e8b10732d0766' Reviewed by: emaste Differential Revision: https://reviews.freebsd.org/D40226
73 lines
2.2 KiB
Plaintext
73 lines
2.2 KiB
Plaintext
# ===========================================================================
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# https://www.gnu.org/software/autoconf-archive/ax_have_poll.html
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# ===========================================================================
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#
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# SYNOPSIS
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#
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# AX_HAVE_POLL([ACTION-IF-FOUND], [ACTION-IF-NOT-FOUND])
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# AX_HAVE_PPOLL([ACTION-IF-FOUND], [ACTION-IF-NOT-FOUND])
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#
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# DESCRIPTION
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#
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# This macro determines whether the system supports the poll I/O event
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# interface. A neat usage example would be:
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#
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# AX_HAVE_POLL(
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# [AX_CONFIG_FEATURE_ENABLE(poll)],
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# [AX_CONFIG_FEATURE_DISABLE(poll)])
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# AX_CONFIG_FEATURE(
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# [poll], [This platform supports poll(7)],
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# [HAVE_POLL], [This platform supports poll(7).])
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#
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# Some systems -- most notably Linux kernel 2.6.16 and later -- also have
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# the variant ppoll(). The availability of that function can be tested
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# with the second macro. Generally speaking, it is safe to assume that
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# AX_HAVE_POLL would succeed if AX_HAVE_PPOLL has, but not the other way
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# round.
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#
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# LICENSE
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#
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# Copyright (c) 2009 Peter Simons <simons@cryp.to>
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#
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# Copying and distribution of this file, with or without modification, are
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# permitted in any medium without royalty provided the copyright notice
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# and this notice are preserved. This file is offered as-is, without any
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# warranty.
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#serial 8
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AC_DEFUN([AX_HAVE_POLL], [dnl
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AC_MSG_CHECKING([for poll(2)])
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AC_CACHE_VAL([ax_cv_have_poll], [dnl
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AC_LINK_IFELSE([dnl
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AC_LANG_PROGRAM(
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[#include <poll.h>],
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[int rc; rc = poll((struct pollfd *)(0), 0, 0);])],
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[ax_cv_have_poll=yes],
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[ax_cv_have_poll=no])])
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AS_IF([test "${ax_cv_have_poll}" = "yes"],
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[AC_MSG_RESULT([yes])
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$1],[AC_MSG_RESULT([no])
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$2])
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])dnl
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AC_DEFUN([AX_HAVE_PPOLL], [dnl
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AC_MSG_CHECKING([for ppoll(2)])
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AC_CACHE_VAL([ax_cv_have_ppoll], [dnl
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AC_LINK_IFELSE([dnl
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AC_LANG_PROGRAM(
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[dnl
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#include <poll.h>
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#include <signal.h>],
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[dnl
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int rc;
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rc = poll((struct pollfd *)(0), 0, 0);
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rc = ppoll((struct pollfd *)(0), 0, (struct timespec const *)(0), (sigset_t const *)(0));])],
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[ax_cv_have_ppoll=yes],
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[ax_cv_have_ppoll=no])])
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AS_IF([test "${ax_cv_have_ppoll}" = "yes"],
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[AC_MSG_RESULT([yes])
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$1],[AC_MSG_RESULT([no])
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$2])
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])
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