new file mode 100644
--- /dev/null
+++ b/src/os/unix/ngx_freebsd_init.c
@@ -0,0 +1,225 @@
+
+/*
+ * Copyright (C) Igor Sysoev
+ */
+
+
+#include <ngx_config.h>
+#include <ngx_core.h>
+
+
+/* FreeBSD 3.0 at least */
+char ngx_freebsd_kern_ostype[20];
+char ngx_freebsd_kern_osrelease[20];
+int ngx_freebsd_kern_osreldate;
+int ngx_freebsd_hw_ncpu;
+int ngx_freebsd_net_inet_tcp_sendspace;
+
+/* FreeBSD 4.9 */
+int ngx_freebsd_machdep_hlt_logical_cpus;
+
+/* FreeBSD 5.0 */
+int ngx_freebsd_kern_ipc_zero_copy_send;
+
+
+ngx_uint_t ngx_freebsd_sendfile_nbytes_bug;
+ngx_uint_t ngx_freebsd_use_tcp_nopush;
+
+
+ngx_os_io_t ngx_os_io = {
+    ngx_unix_recv,
+    ngx_readv_chain,
+    ngx_unix_send,
+#if (HAVE_SENDFILE)
+    ngx_freebsd_sendfile_chain,
+    NGX_IO_SENDFILE
+#else
+    ngx_writev_chain,
+    0
+#endif
+};
+
+
+typedef struct {
+    char        *name;
+    int         *value;
+    size_t       size;
+    ngx_uint_t   exists;
+} sysctl_t;
+
+
+sysctl_t sysctls[] = {
+    { "hw.ncpu",
+      &ngx_freebsd_hw_ncpu,
+      sizeof(int), 0 },
+
+    { "machdep.hlt_logical_cpus",
+      &ngx_freebsd_machdep_hlt_logical_cpus,
+      sizeof(int), 0 },
+
+    { "net.inet.tcp.sendspace",
+      &ngx_freebsd_net_inet_tcp_sendspace,
+      sizeof(int), 0 },
+
+    { "kern.ipc.zero_copy.send",
+      &ngx_freebsd_kern_ipc_zero_copy_send,
+      sizeof(int), 0 },
+
+    { NULL, NULL, 0, 0 }
+};
+
+
+void ngx_debug_init()
+{
+#if (NGX_DEBUG && !NGX_NO_DEBUG_MALLOC)
+
+#if __FreeBSD_version >= 500014
+    _malloc_options = "J";
+#else
+    malloc_options = "J";
+#endif
+
+#endif
+}
+
+
+ngx_int_t ngx_os_init(ngx_log_t *log)
+{
+    int         version;
+    size_t      size;
+    ngx_err_t   err;
+    ngx_uint_t  i;
+
+    size = sizeof(ngx_freebsd_kern_ostype);
+    if (sysctlbyname("kern.ostype",
+                     ngx_freebsd_kern_ostype, &size, NULL, 0) == -1) {
+        ngx_log_error(NGX_LOG_ALERT, log, ngx_errno,
+                      "sysctlbyname(kern.ostype) failed");
+        return NGX_ERROR;
+    }
+
+    size = sizeof(ngx_freebsd_kern_osrelease);
+    if (sysctlbyname("kern.osrelease",
+                     ngx_freebsd_kern_osrelease, &size, NULL, 0) == -1) {
+        ngx_log_error(NGX_LOG_ALERT, log, ngx_errno,
+                      "sysctlbyname(kern.osrelease) failed");
+        return NGX_ERROR;
+    }
+
+
+    size = sizeof(int);
+    if (sysctlbyname("kern.osreldate",
+                     &ngx_freebsd_kern_osreldate, &size, NULL, 0) == -1) {
+        ngx_log_error(NGX_LOG_ALERT, log, ngx_errno,
+                      "sysctlbyname(kern.osreldate) failed");
+        return NGX_ERROR;
+    }
+
+    version = ngx_freebsd_kern_osreldate;
+
+
+#if (HAVE_SENDFILE)
+
+    /*
+     * The determination of the sendfile() "nbytes bug" is complex enough.
+     * There are two sendfile() syscalls: a new #393 has no bug while
+     * an old #336 has the bug in some versions and has not in others.
+     * Besides libc_r wrapper also emulates the bug in some versions.
+     * There is no way to say exactly if syscall #336 in FreeBSD circa 4.6
+     * has the bug.  We use the algorithm that is correct at least for
+     * RELEASEs and for syscalls only (not libc_r wrapper).
+     *
+     * 4.6.1-RELEASE and below have the bug
+     * 4.6.2-RELEASE and above have the new syscall
+     *
+     * We detect the new sendfile() syscall 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 */
+
+    ngx_freebsd_sendfile_nbytes_bug = 0;
+
+#else
+
+    /* an old syscall that may have the bug */
+
+    ngx_freebsd_sendfile_nbytes_bug = 1;
+
+#endif
+
+#endif /* HAVE_SENDFILE */
+
+
+    if ((version < 500000 && version >= 440003) || version >= 500017) {
+        ngx_freebsd_use_tcp_nopush = 1;
+    }
+
+
+    for (i = 0; sysctls[i].name; i++) {
+        *sysctls[i].value = 0;
+        size = sysctls[i].size;
+
+        if (sysctlbyname(sysctls[i].name, sysctls[i].value, &size, NULL, 0)
+                                                                          == 0)
+        {
+            sysctls[i].exists = 1;
+            continue;
+        }
+
+        err = ngx_errno;
+
+        if (err == NGX_ENOENT) {
+            continue;
+        }
+
+#if 0
+        if (sysctls[i].value == &ngx_freebsd_machdep_hlt_logical_cpus) {
+            continue;
+        }
+#endif
+
+        ngx_log_error(NGX_LOG_ALERT, log, err,
+                      "sysctlbyname(%s) failed", sysctls[i].name);
+        return NGX_ERROR;
+    }
+
+    if (ngx_freebsd_machdep_hlt_logical_cpus) {
+        ngx_ncpu = ngx_freebsd_hw_ncpu / 2;
+    } else {
+        ngx_ncpu = ngx_freebsd_hw_ncpu;
+    }
+
+    return ngx_posix_init(log);
+}
+
+
+void ngx_os_status(ngx_log_t *log)
+{
+    ngx_uint_t  i;
+
+    ngx_log_error(NGX_LOG_INFO, log, 0, "OS: %s %s",
+                  ngx_freebsd_kern_ostype, ngx_freebsd_kern_osrelease);
+
+#ifdef __DragonFly_version
+    ngx_log_error(NGX_LOG_INFO, log, 0,
+                  "kern.osreldate: %d, built on %d",
+                  ngx_freebsd_kern_osreldate, __DragonFly_version);
+#else
+    ngx_log_error(NGX_LOG_INFO, log, 0,
+                  "kern.osreldate: %d, built on %d",
+                  ngx_freebsd_kern_osreldate, __FreeBSD_version);
+#endif
+
+    for (i = 0; sysctls[i].name; i++) {
+        if (sysctls[i].exists) {
+            ngx_log_error(NGX_LOG_INFO, log, 0, "%s: %d",
+                          sysctls[i].name, *sysctls[i].value);
+        }
+    }
+
+    ngx_posix_status(log);
+}