Rename ETR_ prefixed macros to AX_ prefixed macros.

1 files changed, 88 insertions, 0 deletions

diff --git a/m4/ax_short_sleep.m4 b/m4/ax_short_sleep.m4
new file mode 100644
index 0000000..b3a789d
--- /dev/null
+++ b/m4/ax_short_sleep.m4
@@ -0,0 +1,88 @@
+# ===========================================================================
+#         http://www.nongnu.org/autoconf-archive/etr_short_sleep.html
+# ===========================================================================
+#
+# SYNOPSIS
+#
+#   AX_SHORT_SLEEP
+#
+# DESCRIPTION
+#
+#   This macro searches for a "sleep" function that has 1/1000 of a second
+#   accuracy. On some systems, this is known as nap() and on others usleep()
+#   / 1000. There are probably other functions like this defined in other
+#   system libraries, but we don't know how to search for them yet.
+#   Contributions joyously accepted. :)
+#
+# LICENSE
+#
+#   Copyright (c) 2008 Warren Young <warren@etr-usa.com>
+#
+#   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.
+
+AC_DEFUN([AX_SHORT_SLEEP],
+[
+        AC_MSG_CHECKING([for nap() in libc])
+        AC_TRY_LINK([ extern "C" long nap(long ms); ], [ nap(42); ],
+                [
+                        etr_ss_found=yes
+                        etr_ss_factor=1
+                        AC_DEFINE(HAVE_NAP,1,
+                                [Define to use the nap() system call for short sleeps])
+                        AC_MSG_RESULT(yes)
+                ],
+                [
+                        AC_MSG_RESULT(no)
+                        etr_ss_found=no
+                ])
+
+        if test x"$etr_ss_found" = "xno"
+        then
+                AC_MSG_CHECKING([for usleep()])
+                AC_TRY_LINK([ #include <unistd.h> ], [ usleep(42); ],
+                        [
+                                etr_ss_found=yes
+                                etr_ss_factor=1000
+                                AC_DEFINE(HAVE_USLEEP,1,
+                                        [Define to use the usleep() system call for short sleeps])
+                                AC_MSG_RESULT(yes)
+                        ],
+                        [
+                                AC_MSG_RESULT(no)
+                                etr_ss_found=no
+                        ])
+        fi
+
+        if test x"$etr_ss_found" = "xno"
+        then
+                save_LIBS=$LIBS
+                LIBS="$LIBS -lx"
+                AC_MSG_CHECKING([for nap() in libx])
+                AC_TRY_LINK([ extern "C" long nap(long ms); ], [ nap(42); ],
+                        [
+                                etr_ss_found=yes
+                                etr_ss_factor=1
+                                AC_DEFINE(HAVE_NAP,1,
+                                        [Define to use the nap() system call for short sleeps])
+                                AC_MSG_RESULT(yes)
+                        ],
+                        [
+                                AC_MSG_RESULT(no)
+                                etr_ss_found=no
+                        ])
+
+                LIBS=$save_LIBS
+                AX_SS_LIB=-lx
+                AC_SUBST(AX_SS_LIB)
+        fi
+
+        if test x"$etr_ss_found" = "xyes"
+        then
+                AC_DEFINE_UNQUOTED(SHORT_SLEEP_FACTOR, $etr_ss_factor,
+                        [Multiply milliseconds by this to get the argument for the short sleep system call])
+        else
+                AC_MSG_ERROR([Could not find a "short sleep" system call.])
+        fi
+])dnl AX_SHORT_SLEEP