support change work_dir for oryx.

@@ -343,6 +343,7 @@ Remark:
 
 ## History
 
+* v2.0, 2016-09-23, support change work_dir for oryx.
 * v2.0, 2016-09-15, fix #640, typo for rtmp type. 2.0.217
 * v2.0, 2016-09-12, fix fast stream error bug. 2.0.216
 * <strong>v2.0, 2016-09-09, [2.0 beta1(2.0.215)][r2.0b1] released. 89941 lines.</strong>

@@ -50,6 +50,12 @@ daemon              on;
 # default: off
 utc_time            off;
 
+# the work dir for server, to chdir(work_dir) when not empty or "./"
+# user can config this directory to change the dir.
+# @reamrk do not support reload.
+# default: ./
+work_dir ./;
+
 #############################################################################################
 # heartbeat/stats sections
 #############################################################################################

@@ -1567,7 +1567,7 @@ int SrsConfig::check_config()
             && n != "max_connections" && n != "daemon" && n != "heartbeat"
             && n != "http_api" && n != "stats" && n != "vhost" && n != "pithy_print_ms"
             && n != "http_stream" && n != "http_server" && n != "stream_caster"
-            && n != "utc_time"
+            && n != "utc_time" && n != "work_dir"
         ) {
             ret = ERROR_SYSTEM_CONFIG_INVALID;
             srs_error("unsupported directive %s, ret=%d", n.c_str(), ret);
@@ -2172,6 +2172,17 @@ bool SrsConfig::get_utc_time()
     return SRS_CONF_PERFER_FALSE(conf->arg0());
 }
 
+string SrsConfig::get_work_dir() {
+    static string DEFAULT = "./";
+    
+    SrsConfDirective* conf = root->get("work_dir");
+    if( !conf || conf->arg0().empty()) {
+        return DEFAULT;
+    }
+    
+    return conf->arg0();
+}
+
 vector<SrsConfDirective*> SrsConfig::get_stream_casters()
 {
     srs_assert(root);

@@ -374,6 +374,11 @@ public:
      * whether use utc-time to format the time.
      */
     virtual bool                get_utc_time();
+    /**
+     * get the configed work dir.
+     * ignore if empty string.
+     */
+    virtual std::string         get_work_dir();
 // stream_caster section
 public:
     /**

@@ -282,6 +282,13 @@ int main(int argc, char** argv)
         return ret;
     }
     
+    // change the work dir and set cwd.
+    std::string cwd = _srs_config->get_work_dir();
+    if (!cwd.empty() && cwd != "./" && (ret = chdir(cwd.c_str())) != ERROR_SUCCESS) {
+        srs_error("change cwd to %s failed. ret=%d", cwd.c_str(), ret);
+        return ret;
+    }
+    
     // config parsed, initialize log.
     if ((ret = _srs_log->initialize()) != ERROR_SUCCESS) {
         return ret;