replace: Move memalign() from lib/util/system.c to libreplace.

1 files changed, 32 insertions, 0 deletions

diff --git a/lib/replace/replace.c b/lib/replace/replace.c
index d9a96ff8ef..f1454cbcd6 100644
--- a/lib/replace/replace.c
+++ b/lib/replace/replace.c
@@ -828,3 +828,35 @@ int rep_clock_gettime(clockid_t clk_id, struct timespec *tp)
 	return 0;
 }
 #endif
+
+#ifndef HAVE_MEMALIGN
+void *rep_memalign( size_t align, size_t size )
+{
+#if defined(HAVE_POSIX_MEMALIGN)
+	void *p = NULL;
+	int ret = posix_memalign( &p, align, size );
+	if ( ret == 0 )
+		return p;
+
+	return NULL;
+#else
+	/* On *BSD systems memaligns doesn't exist, but memory will
+	 * be aligned on allocations of > pagesize. */
+#if defined(SYSCONF_SC_PAGESIZE)
+	size_t pagesize = (size_t)sysconf(_SC_PAGESIZE);
+#elif defined(HAVE_GETPAGESIZE)
+	size_t pagesize = (size_t)getpagesize();
+#else
+	size_t pagesize = (size_t)-1;
+#endif
+	if (pagesize == (size_t)-1) {
+		DEBUG(0,("memalign functionality not available on this platform!\n"));
+		return NULL;
+	}
+	if (size < pagesize) {
+		size = pagesize;
+	}
+	return malloc(size);
+#endif
+}
+#endif