82 lines
1.9 KiB
Plaintext
82 lines
1.9 KiB
Plaintext
$OpenBSD: patch-aclocal_m4,v 1.2 2001/03/17 17:07:11 naddy Exp $
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--- aclocal.m4.orig Mon Feb 26 06:51:03 2001
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+++ aclocal.m4 Sat Mar 17 17:06:03 2001
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@@ -222,7 +222,7 @@ AC_ARG_ENABLE(aotest, [ --disable-aotes
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AO_LIBS="-L$ao_prefix/lib"
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fi
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- AO_LIBS="$AO_LIBS -lao -ldl"
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+ AO_LIBS="$AO_LIBS -lao"
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AC_MSG_CHECKING(for ao)
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no_ao=""
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@@ -292,6 +292,68 @@ int main ()
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AC_SUBST(AO_LIBS)
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rm -f conf.aotest
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])
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+
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+dnl Shamelessly stolen from Joerg Schilling's star.
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+dnl Copyright 1998 J. Schilling
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+
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+dnl Checks if mmap() works to get shared memory
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+dnl Defines HAVE_SMMAP on success.
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+AC_DEFUN(AC_FUNC_SMMAP,
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+[AC_CACHE_CHECK([if mmap works to get shared memory], ac_cv_func_smmap,
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+ [AC_TRY_RUN([
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+#include <sys/types.h>
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+#include <sys/mman.h>
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+
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+char *
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+mkshare()
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+{
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+ int size = 8192;
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+ int f;
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+ char *addr;
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+
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+ if ((f = open("/dev/zero", 2)) < 0)
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+ exit(1);
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+ addr = mmap(0, size, PROT_READ|PROT_WRITE, MAP_SHARED, f, 0);
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+ if (addr == (char *)-1)
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+ exit(1);
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+ close(f);
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+
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+ return (addr);
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+}
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+
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+main()
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+{
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+ char *addr;
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+
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+ addr = mkshare(8192);
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+ *addr = 'I';
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+
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+ switch (fork()) {
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+
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+ case -1:
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+ printf("help\n"); exit(1);
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+
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+ case 0: /* child */
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+ *addr = 'N';
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+ _exit(0);
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+ break;
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+ default: /* parent */
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+ wait(0);
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+ sleep(1);
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+ break;
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+ }
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+
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+ if (*addr != 'N')
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+ exit(1);
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+ exit(0);
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+}
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+],
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+ [ac_cv_func_smmap=yes],
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+ [ac_cv_func_smmap=no],
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+ [ac_cv_func_smmap=no])])
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+if test $ac_cv_func_smmap = yes; then
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+ AC_DEFINE(HAVE_SMMAP)
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+fi])
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# Do all the work for Automake. This macro actually does too much --
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# some checks are only needed if your package does certain things.
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