fix bug of script, support both abs and relative path

@@ -41,17 +41,17 @@ failed_msg() {
 #       1, for pid file not exists.
 #       2, for get proecess info by pid failed.
 # @set variable $error_msg if error.
-# @set variable $srs_pid_file to pid file.
+# @set variable $pid_file to pid file.
 load_process_info() {
     # get pid file
-    srs_pid_file=`cat ${ROOT}/${CONFIG} |grep ^pid|awk '{print $2}'|awk -F ';' '{print $1}'`
-    if [[ -z $srs_pid_file ]]; then srs_pid_file=${DEFAULT_PID_FILE}; fi
+    pid_file=`cd ${ROOT} && cat ${CONFIG} |grep ^pid|awk '{print $2}'|awk -F ';' '{print $1}'`
+    if [[ -z $pid_file ]]; then pid_file=${DEFAULT_PID_FILE}; fi
     # get abs path
-    srs_pid_dir=`dirname $srs_pid_file`
-    srs_pid_file=`(cd ${ROOT}; cd $srs_pid_dir; pwd)`/`basename $srs_pid_file`
+    pid_dir=`dirname $pid_file`
+    pid_file=`(cd ${ROOT}; cd $pid_dir; pwd)`/`basename $pid_file`
     
-    srs_pid=`cat $srs_pid_file 2>/dev/null`
-    ret=$?; if [[ 0 -ne $ret ]]; then error_msg="file $srs_pid_file does not exists"; return 1; fi
+    srs_pid=`cat $pid_file 2>/dev/null`
+    ret=$?; if [[ 0 -ne $ret ]]; then error_msg="file $pid_file does not exists"; return 1; fi
     
     ps -p ${srs_pid} >/dev/null 2>/dev/null
     ret=$?; if [[ 0 -ne $ret ]]; then error_msg="process $srs_pid does not exists"; return 2; fi
@@ -68,17 +68,17 @@ start() {
     ok_msg "Starting SRS..."
     
     # get log file
-    srs_log_file=`cat ${ROOT}/${CONFIG} |grep '^srs_log_file'| awk '{print $2}'| awk -F ';' '{print $1}'`
-    if [[ -z $srs_log_file ]]; then srs_log_file=${DEFAULT_LOG_FILE}; fi
+    log_file=`cd ${ROOT} && cat ${CONFIG} |grep '^log_file'| awk '{print $2}'| awk -F ';' '{print $1}'`
+    if [[ -z $log_file ]]; then log_file=${DEFAULT_LOG_FILE}; fi
     # get abs path
-    srs_log_dir=`dirname $srs_log_file`
-    srs_log_file=`(cd ${ROOT}; cd $srs_log_dir; pwd)`/`basename $srs_log_file`
+    log_dir=`dirname $log_file`
+    log_file=`(cd ${ROOT} && cd $log_dir && pwd)`/`basename $log_file`
     
     # TODO: FIXME: set limit by, for instance, "ulimit -HSn 10000"
-    if [[ -z $srs_log_file ]]; then
-        (cd ${ROOT}; ${ROOT}/${APP} -c ${CONFIG} >/dev/null 2>&1)
+    if [[ -z $log_file ]]; then
+        (cd ${ROOT}; ${APP} -c ${CONFIG} >/dev/null 2>&1)
     else
-        (cd ${ROOT}; ${ROOT}/${APP} -c ${CONFIG} >> $srs_log_file 2>&1)
+        (cd ${ROOT}; ${APP} -c ${CONFIG} >> $log_file 2>&1)
     fi
     
     # check again after start server
@@ -86,7 +86,11 @@ start() {
         # sleep a little while, for srs may start then crash.
         sleep 0.1
         load_process_info
-        ret=$?; if [[ 0 -ne $ret ]]; then failed_msg "SRS start failed, see $srs_log_file"; return $ret; fi
+        ret=$?; if [[ 0 -ne $ret ]]; then 
+            failed_msg "SRS start failed"; 
+            failed_msg "see $log_file"; 
+            return $ret; 
+        fi
     done
     
     # check whether started.

@@ -131,8 +131,6 @@ int main(int argc, char** argv)
 {
     int ret = ERROR_SUCCESS;
     
-    srs_trace("srs(simple-rtmp-server) "RTMP_SIG_SRS_VERSION);
-    
     // TODO: support both little and big endian.
     srs_assert(srs_is_little_endian());
 
@@ -153,10 +151,13 @@ int main(int argc, char** argv)
     #endif
 #endif
     
+    // never use srs log(srs_trace, srs_error, etc) before config parse the option,
+    // which will load the log config and apply it.
     if ((ret = _srs_config->parse_options(argc, argv)) != ERROR_SUCCESS) {
         return ret;
     }
     
+    srs_trace("srs(simple-rtmp-server) "RTMP_SIG_SRS_VERSION);
     srs_trace("uname: "SRS_UNAME);
     srs_trace("build: %s, %s", SRS_BUILD_DATE, srs_is_little_endian()? "little-endian":"big-endian");
     srs_trace("configure: "SRS_CONFIGURE);