3 files changed, 39 insertions, 2 deletions
diff --git a/src/os/unix/ngx_alloc.h b/src/os/unix/ngx_alloc.h
index 8b7b766b2..c7a31aa54 100644
--- a/src/os/unix/ngx_alloc.h
+++ b/src/os/unix/ngx_alloc.h
@@ -21,8 +21,8 @@ void *ngx_calloc(size_t size, ngx_log_t *log);
 /*
  * Linux has memalign() or posix_memalign()
  * Solaris has memalign()
- * FreeBSD has not memalign() or posix_memalign() but its malloc() alignes
- * allocations bigger than page size at the page boundary.
+ * FreeBSD 7.0 has posix_memalign(), besides, early version's malloc()
+ * aligns allocations bigger than page size at the page boundary
  */
 
 #if (NGX_HAVE_POSIX_MEMALIGN || NGX_HAVE_MEMALIGN)
diff --git a/src/os/unix/ngx_files.c b/src/os/unix/ngx_files.c
index 7ee8cbd84..e2148d843 100644
--- a/src/os/unix/ngx_files.c
+++ b/src/os/unix/ngx_files.c
@@ -351,3 +351,22 @@ ngx_unlock_fd(ngx_fd_t fd)
 
     return 0;
 }
+
+
+#if (NGX_HAVE_O_DIRECT)
+
+ngx_int_t
+ngx_directio(ngx_fd_t fd)
+{
+    int  flags;
+
+    flags = fcntl(fd, F_GETFL);
+
+    if (flags == -1) {
+        return -1;
+    }
+
+    return fcntl(fd, F_SETFL, flags | O_DIRECT);
+}
+
+#endif
diff --git a/src/os/unix/ngx_files.h b/src/os/unix/ngx_files.h
index 0c080c494..62af63bce 100644
--- a/src/os/unix/ngx_files.h
+++ b/src/os/unix/ngx_files.h
@@ -189,4 +189,22 @@ ngx_err_t ngx_unlock_fd(ngx_fd_t fd);
 #define ngx_unlock_fd_n          "fcntl(F_SETLK, F_UNLCK)"
 
 
+#if (NGX_HAVE_O_DIRECT)
+
+ngx_int_t ngx_directio(ngx_fd_t fd);
+#define ngx_directio_n           "fcntl(O_DIRECT)"
+
+#elif (NGX_HAVE_F_NOCACHE)
+
+#define ngx_directio(fd)         fcntl(fd, F_NOCACHE, 1)
+#define ngx_directio_n           "fcntl(F_NOCACHE)"
+
+#else
+
+#define ngx_directio(fd)         0
+#define ngx_directio_n           "ngx_directio_n"
+
+#endif
+
+
 #endif /* _NGX_FILES_H_INCLUDED_ */