[xiph-cvs] cvs commit: vorbis-tools acinclude.m4 configure.in

[Kenneth C. Arnold]

kcarnold    01/06/19 09:34:05

  Modified:    .        acinclude.m4 configure.in
  Log:
  Hmmm... somehow these didn't get in the last commit.

Revision  Changes    Path
1.9       +62 -0     vorbis-tools/acinclude.m4

Index: acinclude.m4
===================================================================
RCS file: /usr/local/cvsroot/vorbis-tools/acinclude.m4,v
retrieving revision 1.8
retrieving revision 1.9
diff -u -r1.8 -r1.9
--- acinclude.m4	2001/03/26 22:35:47	1.8
+++ acinclude.m4	2001/06/19 16:34:05	1.9
@@ -300,3 +300,65 @@
   AC_SUBST(AO_LIBS)
   rm -f conf.aotest
 ])
+
+dnl Shamelessly stolen from Joerg Schilling's star.
+dnl Copyright 1998 J. Schilling
+
+dnl Checks if mmap() works to get shared memory
+dnl Defines HAVE_SMMAP on success.
+AC_DEFUN(AC_FUNC_SMMAP,
+[AC_CACHE_CHECK([if mmap works to get shared memory], ac_cv_func_smmap,
+                [AC_TRY_RUN([
+#include <sys/types.h>
+#include <sys/mman.h>
+
+char *
+mkshare()
+{
+        int     size = 8192;
+        int     f;
+        char    *addr;
+
+        if ((f = open("/dev/zero", 2)) < 0)
+                exit(1);
+        addr = mmap(0, size, PROT_READ|PROT_WRITE, MAP_SHARED, f, 0);
+        if (addr == (char *)-1)
+                exit(1);
+        close(f);
+
+        return (addr);
+}
+
+main()
+{
+        char    *addr;
+        
+        addr = mkshare(8192);
+        *addr = 'I';
+
+        switch (fork()) {
+
+        case -1:
+                printf("help\n"); exit(1);
+
+        case 0: /* child */
+                *addr = 'N';
+                _exit(0);
+                break;
+        default: /* parent */
+                wait(0);
+                sleep(1);
+                break;
+        }
+
+        if (*addr != 'N')
+                exit(1);
+        exit(0);
+}
+], 
+                [ac_cv_func_smmap=yes],
+                [ac_cv_func_smmap=no],
+                [ac_cv_func_smmap=no])])
+if test $ac_cv_func_smmap = yes; then
+  AC_DEFINE(HAVE_SMMAP)
+fi])

1.21      +1 -1      vorbis-tools/configure.in

Index: configure.in
===================================================================
RCS file: /usr/local/cvsroot/vorbis-tools/configure.in,v
retrieving revision 1.20
retrieving revision 1.21
diff -u -r1.20 -r1.21
--- configure.in	2001/06/18 02:24:25	1.20
+++ configure.in	2001/06/19 16:34:05	1.21
@@ -67,7 +67,7 @@
 dnl Check for library functions
 dnl --------------------------------------------------
 
-dnl none
+AC_FUNC_SMMAP
 
 dnl --------------------------------------------------
 dnl Work around FHS stupidity

--- >8 ----
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