new file mode 100644
--- /dev/null
+++ b/src/os/unix/ngx_freebsd_init.c
@@ -0,0 +1,67 @@
+
+#include <ngx_freebsd_init.h>
+
+
+int freebsd_kern_osreldate;
+int freebsd_hw_ncpu;
+
+int freebsd_sendfile_nbytes_bug;
+
+
+int ngx_os_init(ngx_log_t *log)
+{
+    size_t  size;
+
+    size = 4;
+    if (sysctlbyname("kern.osreldate",
+                     &freebsd_kern_osreldate, &size, NULL, 0) == -1) {
+        ngx_log_error(NGX_LOG_ALERT, log, errno,
+                      "sysctlbyname(kern.osreldate) failed");
+        return NGX_ERROR;
+    }
+
+    ngx_log_error(NGX_LOG_INFO, log, 0,
+                  "kern.osreldate: %d, built on %d",
+                  freebsd_kern_osreldate, __FreeBSD_version);
+
+
+#if HAVE_FREEBSD_SENDFILE
+
+    /* The determination of the sendfile() nbytes bug is complex enough.
+       There're two sendfile() syscalls: a new 393 has no bug while
+       an old 336 has the bug in some versions and has not in others.
+       libc_r wrapper also emulates the bug in some versions.
+       There's no way to say exactly if a given FreeBSD version has bug.
+       Here is the algorithm that work at least for RELEASEs
+       and for syscalls only (not libc_r wrapper). */
+
+    /* detect was the new sendfile() version available at the compile time
+       to allow an old binary to run correctly on an updated FreeBSD system. */
+
+#if (__FreeBSD__ == 4 && __FreeBSD_version >= 460102) \
+    || __FreeBSD_version == 460002 || __FreeBSD_version >= 500039
+
+    /* a new syscall without the bug */
+    freebsd_sendfile_nbytes_bug = 0;
+
+#else
+
+    /* an old syscall that can have the bug */
+    freebsd_sendfile_nbytes_bug = 1;
+
+#endif
+
+#endif /* HAVE_FREEBSD_SENDFILE */
+
+
+    size = 4;
+    if (sysctlbyname("hw.ncpu", &freebsd_hw_ncpu, &size, NULL, 0) == -1) {
+        ngx_log_error(NGX_LOG_ALERT, log, errno,
+                      "sysctlbyname(hw.ncpu) failed");
+        return NGX_ERROR;
+    }
+
+    ngx_log_error(NGX_LOG_INFO, log, 0, "hw.ncpu: %d", freebsd_hw_ncpu);
+
+    return NGX_OK;
+}