70 lines
1.6 KiB
Plaintext
70 lines
1.6 KiB
Plaintext
$OpenBSD: patch-acinclude_m4,v 1.1 2001/03/17 17:07:10 naddy Exp $
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--- acinclude.m4.orig Sat Mar 17 16:28:41 2001
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+++ acinclude.m4 Sat Mar 17 16:36:54 2001
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@@ -280,3 +280,65 @@ 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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