diff --git a/src/os/unix/ngx_setproctitle.c b/src/os/unix/ngx_setproctitle.c
new file mode 100644
index 0000000..6ac8707
--- /dev/null
+++ b/src/os/unix/ngx_setproctitle.c
@@ -0,0 +1,143 @@
+
+/*
+ * Copyright (C) Igor Sysoev
+ */
+
+
+#include <ngx_config.h>
+#include <ngx_core.h>
+
+
+#if (NGX_SETPROCTITLE_USES_ENV)
+
+/*
+ * To change the process title in Linux and Solaris we have to set argv[1]
+ * to NULL and to copy the title to the same place where the argv[0] points to.
+ * However, argv[0] may be too small to hold a new title.  Fortunately, Linux
+ * and Solaris store argv[] and environ[] one after another.  So we should
+ * ensure that is the continuous memory and then we allocate the new memory
+ * for environ[] and copy it.  After this we could use the memory starting
+ * from argv[0] for our process title.
+ *
+ * The Solaris's standard /bin/ps does not show the changed process title.
+ * You have to use "/usr/ucb/ps -w" instead.  Besides, the UCB ps dos not
+ * show a new title if its length less than the origin command line length.
+ * To avoid it we append to a new title the origin command line in the
+ * parenthesis.
+ */
+
+extern char **environ;
+
+static char *ngx_os_argv_last;
+
+ngx_int_t  ngx_init_setproctitle(ngx_log_t *log)
+{
+    char        *p;
+    size_t       size;
+    ngx_uint_t   i;
+
+    size = 0;
+
+    for (i = 0; environ[i]; i++) {
+        size += ngx_strlen(environ[i]) + 1;
+    }
+
+    if (!(p = ngx_alloc(size, log))) {
+        return NGX_ERROR;
+    }
+
+    ngx_os_argv_last = ngx_os_argv[0];
+
+    for (i = 0; ngx_os_argv[i]; i++) {
+        if (ngx_os_argv_last == ngx_os_argv[i]) {
+            ngx_os_argv_last = ngx_os_argv[i] + ngx_strlen(ngx_os_argv[i]) + 1;
+        }
+    }
+
+    for (i = 0; environ[i]; i++) {
+        if (ngx_os_argv_last == environ[i]) {
+
+            size = ngx_strlen(environ[i]) + 1;
+            ngx_os_argv_last = environ[i] + size;
+
+            ngx_cpystrn(p, environ[i], size);
+            environ[i] = p;
+            p += size;
+        }
+    }
+
+    ngx_os_argv_last--;
+
+    return NGX_OK;
+}
+
+
+void ngx_setproctitle(char *title)
+{
+    u_char     *p;
+
+#if (SOLARIS)
+
+    ngx_int_t   i;
+    size_t      size;
+
+#endif
+
+    ngx_os_argv[1] = NULL;
+
+    p = ngx_cpystrn((u_char *) ngx_os_argv[0], "nginx: ",
+                    ngx_os_argv_last - ngx_os_argv[0]);
+
+    p = ngx_cpystrn(p, (u_char *) title, ngx_os_argv_last - (char *) p);
+
+#if (SOLARIS)
+
+    size = 0;
+
+    for (i = 0; i < ngx_argc; i++) {
+        size += ngx_strlen(ngx_argv[i]) + 1;
+    }
+
+    if (size > (size_t) ((char *) p - ngx_os_argv[0])) {
+
+        /*
+         * ngx_setproctitle() is too rare operation so we use
+         * the non-optimized copies
+         */
+
+        p = ngx_cpystrn(p, (u_char *) " (", ngx_os_argv_last - (char *) p);
+
+        for (i = 0; i < ngx_argc; i++) {
+            p = ngx_cpystrn(p, (u_char *) ngx_argv[i],
+                            ngx_os_argv_last - (char *) p);
+            p = ngx_cpystrn(p, (u_char *) " ", ngx_os_argv_last - (char *) p);
+        }
+
+        if (*(p - 1) == ' ') {
+            *(p - 1) = ')';
+        }
+    }
+
+#endif
+
+    if (ngx_os_argv_last - (char *) p) {
+        ngx_memset(p, NGX_SETPROCTITLE_PAD, ngx_os_argv_last - (char *) p);
+    }
+
+    ngx_log_debug1(NGX_LOG_DEBUG_CORE, ngx_cycle->log, 0,
+                   "setproctitle: \"%s\"", ngx_os_argv[0]);
+}
+
+
+#elif !defined(ngx_setproctitle)
+
+ngx_int_t  ngx_init_setproctitle(ngx_log_t *log)
+{
+    return NGX_OK;
+}
+
+void ngx_setproctitle(char *title)
+{
+}
+
+#endif