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# nonblocking.m4 serial 2
dnl Copyright (C) 2011-2021 Free Software Foundation, Inc.
dnl This file is free software; the Free Software Foundation
dnl gives unlimited permission to copy and/or distribute it,
dnl with or without modifications, as long as this notice is preserved.
dnl Tests whether non-blocking I/O is natively supported by read(), write().
dnl Sets gl_cv_have_nonblocking.
dnl Also tests whether open() supports O_NONBLOCK.
dnl Sets gl_cv_have_open_O_NONBLOCK.
AC_DEFUN([gl_NONBLOCKING_IO],
[
dnl Use AC_REQUIRE here, so that the default behavior below is expanded
dnl once only, before all statements that occur in other macros.
AC_REQUIRE([gl_NONBLOCKING_IO_BODY])
])
AC_DEFUN([gl_NONBLOCKING_IO_BODY],
[
AC_REQUIRE([AC_CANONICAL_HOST])
case "$host_os" in
mingw*) gl_cv_have_nonblocking=no ;;
*) gl_cv_have_nonblocking=yes ;;
esac
case "$host_os" in
mingw*) gl_cv_have_open_O_NONBLOCK=no ;;
*) gl_cv_have_open_O_NONBLOCK=yes ;;
esac
])
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