write pid to ./objs/srs.pid.

 Simple-RTMP-Server
 ==================
 
-SRS(SIMPLE RTMP Server) over state-threads created in 2013.
+SRS(SIMPLE RTMP Server) over state-threads created in 2013.10.
 
 SRS is a simple, [RTMP](https://github.com/winlinvip/simple-rtmp-server/wiki/DeliveryRTMP)/[HLS](https://github.com/winlinvip/simple-rtmp-server/wiki/DeliveryHLS), 
 [high-performance](https://github.com/winlinvip/simple-rtmp-server/wiki/Performance), single/multiple(plan) processes, edge(plan)/origin live server, 
@@ -169,6 +169,7 @@ See also: [Performance Test Guide](https://github.com/winlinvip/simple-rtmp-serv
 * nginx v1.5.0: 139524 lines <br/>
 
 ### History
+* v1.0, 2014-03-21, write pid to ./objs/srs.pid.
 * v1.0, 2014-03-20, refine hls code, support pure audio HLS.
 * v1.0, 2014-03-19, add vn/an for FFMPEG to drop video/audio for radio stream.
 * v1.0, 2014-03-19, refine handshake, client support coplex handshake, add utest.
@@ -429,7 +430,7 @@ Bandwidth Test Workflow:
 @See: class SrsBandwidth comments.
 </pre>
 
-Beijing, 2013<br/>
+Beijing, 2013.10<br/>
 Winlin
 
 

@@ -2,6 +2,12 @@
 
 # the listen ports, split by space.
 listen              1935;
+# the pid file
+# to ensure only one process can use a pid file
+# and provides the current running process id, for script, 
+# for example, init.d script to manage the server.
+# default: ./objs/srs.pid
+pid                 ./objs/srs.pid;
 # the default chunk size is 128, max is 65536,
 # some client does not support chunk size change,
 # however, most clients supports it and it can improve 

@@ -682,6 +682,7 @@ int SrsConfig::parse_file(const char* filename)
     // TODO: check forward.
     // TODO: check ffmpeg.
     // TODO: check http.
+    // TODO: check pid.
     
     return ret;
 }
@@ -1440,6 +1441,17 @@ SrsConfDirective* SrsConfig::get_listen()
     return root->get("listen");
 }
 
+string SrsConfig::get_pid_file()
+{
+    SrsConfDirective* conf = root->get("pid");
+    
+    if (!conf) {
+        return SRS_CONF_DEFAULT_PID_FILE;
+    }
+    
+    return conf->arg0();
+}
+
 int SrsConfig::get_chunk_size(const std::string &vhost)
 {
     SrsConfDirective* conf = get_vhost(vhost);

@@ -38,6 +38,7 @@ CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #define RTMP_VHOST_DEFAULT "__defaultVhost__"
 
 #define SRS_LOCALHOST "127.0.0.1"
+#define SRS_CONF_DEFAULT_PID_FILE "./objs/srs.pid"
 
 #define SRS_CONF_DEFAULT_HLS_PATH "./objs/nginx/html"
 #define SRS_CONF_DEFAULT_HLS_FRAGMENT 10
@@ -116,62 +117,63 @@ private:
     virtual int parse_argv(int& i, char** argv);
     virtual void print_help(char** argv);
 public:
-    virtual SrsConfDirective*     get_vhost(std::string vhost);
-    virtual bool                  get_vhost_enabled(std::string vhost);
-    virtual bool                  get_vhost_enabled(SrsConfDirective* vhost);
-    virtual SrsConfDirective*     get_vhost_on_connect(std::string vhost);
-    virtual SrsConfDirective*     get_vhost_on_close(std::string vhost);
-    virtual SrsConfDirective*     get_vhost_on_publish(std::string vhost);
-    virtual SrsConfDirective*     get_vhost_on_unpublish(std::string vhost);
-    virtual SrsConfDirective*     get_vhost_on_play(std::string vhost);
-    virtual SrsConfDirective*     get_vhost_on_stop(std::string vhost);
-    virtual SrsConfDirective*     get_transcode(std::string vhost, std::string scope);
-    virtual bool                  get_transcode_enabled(SrsConfDirective* transcode);
-    virtual std::string            get_transcode_ffmpeg(SrsConfDirective* transcode);
+    virtual SrsConfDirective*   get_vhost(std::string vhost);
+    virtual bool                get_vhost_enabled(std::string vhost);
+    virtual bool                get_vhost_enabled(SrsConfDirective* vhost);
+    virtual SrsConfDirective*   get_vhost_on_connect(std::string vhost);
+    virtual SrsConfDirective*   get_vhost_on_close(std::string vhost);
+    virtual SrsConfDirective*   get_vhost_on_publish(std::string vhost);
+    virtual SrsConfDirective*   get_vhost_on_unpublish(std::string vhost);
+    virtual SrsConfDirective*   get_vhost_on_play(std::string vhost);
+    virtual SrsConfDirective*   get_vhost_on_stop(std::string vhost);
+    virtual SrsConfDirective*   get_transcode(std::string vhost, std::string scope);
+    virtual bool                get_transcode_enabled(SrsConfDirective* transcode);
+    virtual std::string         get_transcode_ffmpeg(SrsConfDirective* transcode);
     virtual void                get_transcode_engines(SrsConfDirective* transcode, std::vector<SrsConfDirective*>& engines);
     virtual bool                get_engine_enabled(SrsConfDirective* engine);
-    virtual std::string            get_engine_vcodec(SrsConfDirective* engine);
-    virtual int                    get_engine_vbitrate(SrsConfDirective* engine);
-    virtual double                get_engine_vfps(SrsConfDirective* engine);
-    virtual int                    get_engine_vwidth(SrsConfDirective* engine);
-    virtual int                    get_engine_vheight(SrsConfDirective* engine);
-    virtual int                    get_engine_vthreads(SrsConfDirective* engine);
-    virtual std::string            get_engine_vprofile(SrsConfDirective* engine);
-    virtual std::string            get_engine_vpreset(SrsConfDirective* engine);
+    virtual std::string         get_engine_vcodec(SrsConfDirective* engine);
+    virtual int                 get_engine_vbitrate(SrsConfDirective* engine);
+    virtual double              get_engine_vfps(SrsConfDirective* engine);
+    virtual int                 get_engine_vwidth(SrsConfDirective* engine);
+    virtual int                 get_engine_vheight(SrsConfDirective* engine);
+    virtual int                 get_engine_vthreads(SrsConfDirective* engine);
+    virtual std::string         get_engine_vprofile(SrsConfDirective* engine);
+    virtual std::string         get_engine_vpreset(SrsConfDirective* engine);
     virtual void                get_engine_vparams(SrsConfDirective* engine, std::vector<std::string>& vparams);
     virtual void                get_engine_vfilter(SrsConfDirective* engine, std::vector<std::string>& vfilter);
-    virtual std::string            get_engine_acodec(SrsConfDirective* engine);
-    virtual int                    get_engine_abitrate(SrsConfDirective* engine);
-    virtual int                    get_engine_asample_rate(SrsConfDirective* engine);
-    virtual int                    get_engine_achannels(SrsConfDirective* engine);
+    virtual std::string         get_engine_acodec(SrsConfDirective* engine);
+    virtual int                 get_engine_abitrate(SrsConfDirective* engine);
+    virtual int                 get_engine_asample_rate(SrsConfDirective* engine);
+    virtual int                 get_engine_achannels(SrsConfDirective* engine);
     virtual void                get_engine_aparams(SrsConfDirective* engine, std::vector<std::string>& aparams);
-    virtual std::string            get_engine_output(SrsConfDirective* engine);
-    virtual std::string            get_log_dir();
-    virtual int                    get_max_connections();
+    virtual std::string         get_engine_output(SrsConfDirective* engine);
+    virtual std::string         get_log_dir();
+    virtual int                 get_max_connections();
     virtual bool                get_gop_cache(std::string vhost);
-    virtual double                get_queue_length(std::string vhost);
-    virtual SrsConfDirective*    get_forward(std::string vhost);
+    virtual double              get_queue_length(std::string vhost);
+    virtual SrsConfDirective*   get_forward(std::string vhost);
 private:
-    virtual SrsConfDirective*    get_hls(std::string vhost);
+    virtual SrsConfDirective*   get_hls(std::string vhost);
 public:
     virtual bool                get_hls_enabled(std::string vhost);
-    virtual std::string            get_hls_path(std::string vhost);
-    virtual double                get_hls_fragment(std::string vhost);
-    virtual double                get_hls_window(std::string vhost);
-    virtual SrsConfDirective*    get_refer(std::string vhost);
-    virtual SrsConfDirective*    get_refer_play(std::string vhost);
-    virtual SrsConfDirective*    get_refer_publish(std::string vhost);
-    virtual SrsConfDirective*    get_listen();
-    virtual int                    get_chunk_size(const std::string& vhost);
-    virtual int                    get_pithy_print_publish();
-    virtual int                    get_pithy_print_forwarder();
-    virtual int                    get_pithy_print_encoder();
-    virtual int                    get_pithy_print_hls();
-    virtual int                    get_pithy_print_play();
+    virtual std::string         get_hls_path(std::string vhost);
+    virtual double              get_hls_fragment(std::string vhost);
+    virtual double              get_hls_window(std::string vhost);
+    virtual SrsConfDirective*   get_refer(std::string vhost);
+    virtual SrsConfDirective*   get_refer_play(std::string vhost);
+    virtual SrsConfDirective*   get_refer_publish(std::string vhost);
+    virtual SrsConfDirective*   get_listen();
+    virtual std::string         get_pid_file();
+    virtual int                 get_chunk_size(const std::string& vhost);
+    virtual int                 get_pithy_print_publish();
+    virtual int                 get_pithy_print_forwarder();
+    virtual int                 get_pithy_print_encoder();
+    virtual int                 get_pithy_print_hls();
+    virtual int                 get_pithy_print_play();
     virtual bool                get_bw_check_enabled(const std::string& vhost);
-    virtual std::string            get_bw_check_key(const std::string& vhost);
-    virtual int                    get_bw_check_interval_ms(const std::string& vhost);
-    virtual int                    get_bw_check_limit_kbps(const std::string& vhost);
+    virtual std::string         get_bw_check_key(const std::string& vhost);
+    virtual int                 get_bw_check_interval_ms(const std::string& vhost);
+    virtual int                 get_bw_check_limit_kbps(const std::string& vhost);
 };
 
 /**

@@ -27,6 +27,9 @@ CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #include <sys/socket.h>
 #include <arpa/inet.h>
 #include <signal.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
 
 #include <algorithm>
 
@@ -198,6 +201,81 @@ int SrsServer::initialize()
     return ret;
 }
 
+int SrsServer::acquire_pid_file()
+{
+    int ret = ERROR_SUCCESS;
+    
+    std::string pid_file = _srs_config->get_pid_file();
+    
+    // -rw-r--r-- 
+    // 644
+    int mode = S_IRUSR | S_IWUSR |  S_IRGRP | S_IROTH;
+    
+    int fd;
+    // open pid file
+    if ((fd = ::open(pid_file.c_str(), O_WRONLY | O_CREAT, mode)) < 0) {
+        ret = ERROR_SYSTEM_PID_ACQUIRE;
+        srs_error("open pid file %s error, ret=%#x", pid_file.c_str(), ret);
+        return ret;
+    }
+    
+    // require write lock
+    flock lock;
+
+    lock.l_type = F_WRLCK; // F_RDLCK, F_WRLCK, F_UNLCK
+    lock.l_start = 0; // type offset, relative to l_whence
+    lock.l_whence = SEEK_SET;  // SEEK_SET, SEEK_CUR, SEEK_END
+    lock.l_len = 0;
+    
+    if (fcntl(fd, F_SETLK, &lock) < 0) {
+        if(errno == EACCES || errno == EAGAIN) {
+            ret = ERROR_SYSTEM_PID_ALREADY_RUNNING;
+            srs_error("srs is already running! ret=%#x", ret);
+            return ret;
+        }
+        
+        ret = ERROR_SYSTEM_PID_LOCK;
+        srs_error("require lock for file %s error! ret=%#x", pid_file.c_str(), ret);
+        return ret;
+    }
+
+    // truncate file
+    if (ftruncate(fd, 0) < 0) {
+        ret = ERROR_SYSTEM_PID_TRUNCATE_FILE;
+        srs_error("truncate pid file %s error! ret=%#x", pid_file.c_str(), ret);
+        return ret;
+    }
+
+    int pid = (int)getpid();
+    
+    // write the pid
+    char buf[512];
+    snprintf(buf, sizeof(buf), "%d", pid);
+    if (write(fd, buf, strlen(buf)) != (int)strlen(buf)) {
+        ret = ERROR_SYSTEM_PID_WRITE_FILE;
+        srs_error("write our pid error! pid=%d file=%s ret=%#x", pid, pid_file.c_str(), ret);
+        return ret;
+    }
+
+    // auto close when fork child process.
+    int val;
+    if ((val = fcntl(fd, F_GETFD, 0)) < 0) {
+        ret = ERROR_SYSTEM_PID_GET_FILE_INFO;
+        srs_error("fnctl F_GETFD error! file=%s ret=%#x", pid_file.c_str(), ret);
+        return ret;
+    }
+    val |= FD_CLOEXEC;
+    if (fcntl(fd, F_SETFD, val) < 0) {
+        ret = ERROR_SYSTEM_PID_SET_FILE_INFO;
+        srs_error("fcntl F_SETFD error! file=%s ret=%#x", pid_file.c_str(), ret);
+        return ret;
+    }
+    
+    srs_trace("write pid=%d to %s success!", pid, pid_file.c_str());
+    
+    return ret;
+}
+
 int SrsServer::listen()
 {
     int ret = ERROR_SUCCESS;

@@ -79,6 +79,7 @@ public:
     virtual ~SrsServer();
 public:
     virtual int initialize();
+    virtual int acquire_pid_file();
     virtual int listen();
     virtual int cycle();
     virtual void remove(SrsConnection* conn);

@@ -30,133 +30,140 @@ CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 
 #include <srs_core.hpp>
 
-#define ERROR_SUCCESS                     0
-
-#define ERROR_ST_SET_EPOLL                 100
-#define ERROR_ST_INITIALIZE             101
-#define ERROR_ST_OPEN_SOCKET            102
-#define ERROR_ST_CREATE_LISTEN_THREAD    103
-#define ERROR_ST_CREATE_CYCLE_THREAD    104
-#define ERROR_ST_CONNECT                105
-
-#define ERROR_SOCKET_CREATE             200
-#define ERROR_SOCKET_SETREUSE             201
-#define ERROR_SOCKET_BIND                 202
-#define ERROR_SOCKET_LISTEN             203
-#define ERROR_SOCKET_CLOSED             204
-#define ERROR_SOCKET_GET_PEER_NAME        205
-#define ERROR_SOCKET_GET_PEER_IP        206
-#define ERROR_SOCKET_READ                207
-#define ERROR_SOCKET_READ_FULLY            208
-#define ERROR_SOCKET_WRITE                209
-#define ERROR_SOCKET_WAIT                210
-#define ERROR_SOCKET_TIMEOUT            211
-#define ERROR_SOCKET_GET_LOCAL_IP       212
-
-#define ERROR_RTMP_PLAIN_REQUIRED        300
-#define ERROR_RTMP_CHUNK_START            301
-#define ERROR_RTMP_MSG_INVLIAD_SIZE        302
-#define ERROR_RTMP_AMF0_DECODE            303
-#define ERROR_RTMP_AMF0_INVALID            304
-#define ERROR_RTMP_REQ_CONNECT            305
-#define ERROR_RTMP_REQ_TCURL            306
-#define ERROR_RTMP_MESSAGE_DECODE        307
-#define ERROR_RTMP_MESSAGE_ENCODE        308
-#define ERROR_RTMP_AMF0_ENCODE            309
-#define ERROR_RTMP_CHUNK_SIZE            310
-#define ERROR_RTMP_TRY_SIMPLE_HS        311
-#define ERROR_RTMP_CH_SCHEMA            312
-#define ERROR_RTMP_PACKET_SIZE            313
-#define ERROR_RTMP_VHOST_NOT_FOUND        314
-#define ERROR_RTMP_ACCESS_DENIED        315
-#define ERROR_RTMP_HANDSHAKE            316
-#define ERROR_RTMP_NO_REQUEST            317
+#define ERROR_SUCCESS                       0
+
+#define ERROR_ST_SET_EPOLL                  100
+#define ERROR_ST_INITIALIZE                 101
+#define ERROR_ST_OPEN_SOCKET                102
+#define ERROR_ST_CREATE_LISTEN_THREAD       103
+#define ERROR_ST_CREATE_CYCLE_THREAD        104
+#define ERROR_ST_CONNECT                    105
+
+#define ERROR_SOCKET_CREATE                 200
+#define ERROR_SOCKET_SETREUSE               201
+#define ERROR_SOCKET_BIND                   202
+#define ERROR_SOCKET_LISTEN                 203
+#define ERROR_SOCKET_CLOSED                 204
+#define ERROR_SOCKET_GET_PEER_NAME          205
+#define ERROR_SOCKET_GET_PEER_IP            206
+#define ERROR_SOCKET_READ                   207
+#define ERROR_SOCKET_READ_FULLY             208
+#define ERROR_SOCKET_WRITE                  209
+#define ERROR_SOCKET_WAIT                   210
+#define ERROR_SOCKET_TIMEOUT                211
+#define ERROR_SOCKET_GET_LOCAL_IP           212
+
+#define ERROR_RTMP_PLAIN_REQUIRED           300
+#define ERROR_RTMP_CHUNK_START              301
+#define ERROR_RTMP_MSG_INVLIAD_SIZE         302
+#define ERROR_RTMP_AMF0_DECODE              303
+#define ERROR_RTMP_AMF0_INVALID             304
+#define ERROR_RTMP_REQ_CONNECT              305
+#define ERROR_RTMP_REQ_TCURL                306
+#define ERROR_RTMP_MESSAGE_DECODE           307
+#define ERROR_RTMP_MESSAGE_ENCODE           308
+#define ERROR_RTMP_AMF0_ENCODE              309
+#define ERROR_RTMP_CHUNK_SIZE               310
+#define ERROR_RTMP_TRY_SIMPLE_HS            311
+#define ERROR_RTMP_CH_SCHEMA                312
+#define ERROR_RTMP_PACKET_SIZE              313
+#define ERROR_RTMP_VHOST_NOT_FOUND          314
+#define ERROR_RTMP_ACCESS_DENIED            315
+#define ERROR_RTMP_HANDSHAKE                316
+#define ERROR_RTMP_NO_REQUEST               317
 // if user use complex handshake, but without ssl,
 // 1. srs is ok, ignore and turn to simple handshake.
 // 2. srs-librtmp return error, to terminate the program.
-#define ERROR_RTMP_HS_SSL_REQUIRE        318
-
-#define ERROR_SYSTEM_STREAM_INIT        400
-#define ERROR_SYSTEM_PACKET_INVALID        401
-#define ERROR_SYSTEM_CLIENT_INVALID        402
-#define ERROR_SYSTEM_ASSERT_FAILED        403
-#define ERROR_SYSTEM_SIZE_NEGATIVE        404
-#define ERROR_SYSTEM_CONFIG_INVALID        405
-#define ERROR_SYSTEM_CONFIG_DIRECTIVE    406
-#define ERROR_SYSTEM_CONFIG_BLOCK_START    407
-#define ERROR_SYSTEM_CONFIG_BLOCK_END    408
-#define ERROR_SYSTEM_CONFIG_EOF            409
-#define ERROR_SYSTEM_STREAM_BUSY        410
-#define ERROR_SYSTEM_IP_INVALID            411
-#define ERROR_SYSTEM_FORWARD_LOOP        412
-#define ERROR_SYSTEM_WAITPID            413
-#define ERROR_SYSTEM_BANDWIDTH_KEY        414
-#define ERROR_SYSTEM_BANDWIDTH_DENIED    415
+#define ERROR_RTMP_HS_SSL_REQUIRE           318
+
+#define ERROR_SYSTEM_STREAM_INIT            400
+#define ERROR_SYSTEM_PACKET_INVALID         401
+#define ERROR_SYSTEM_CLIENT_INVALID         402
+#define ERROR_SYSTEM_ASSERT_FAILED          403
+#define ERROR_SYSTEM_SIZE_NEGATIVE          404
+#define ERROR_SYSTEM_CONFIG_INVALID         405
+#define ERROR_SYSTEM_CONFIG_DIRECTIVE       406
+#define ERROR_SYSTEM_CONFIG_BLOCK_START     407
+#define ERROR_SYSTEM_CONFIG_BLOCK_END       408
+#define ERROR_SYSTEM_CONFIG_EOF             409
+#define ERROR_SYSTEM_STREAM_BUSY            410
+#define ERROR_SYSTEM_IP_INVALID             411
+#define ERROR_SYSTEM_FORWARD_LOOP           412
+#define ERROR_SYSTEM_WAITPID                413
+#define ERROR_SYSTEM_BANDWIDTH_KEY          414
+#define ERROR_SYSTEM_BANDWIDTH_DENIED       415
+#define ERROR_SYSTEM_PID_ACQUIRE            416
+#define ERROR_SYSTEM_PID_ALREADY_RUNNING    417
+#define ERROR_SYSTEM_PID_LOCK               418
+#define ERROR_SYSTEM_PID_TRUNCATE_FILE      419
+#define ERROR_SYSTEM_PID_WRITE_FILE         420
+#define ERROR_SYSTEM_PID_GET_FILE_INFO      421
+#define ERROR_SYSTEM_PID_SET_FILE_INFO      422
 
 // see librtmp.
 // failed when open ssl create the dh
-#define ERROR_OpenSslCreateDH            500
+#define ERROR_OpenSslCreateDH               500
 // failed when open ssl create the Private key.
-#define ERROR_OpenSslCreateP            501
+#define ERROR_OpenSslCreateP                501
 // when open ssl create G.
-#define ERROR_OpenSslCreateG            502
+#define ERROR_OpenSslCreateG                502
 // when open ssl parse P1024
-#define ERROR_OpenSslParseP1024            503
+#define ERROR_OpenSslParseP1024             503
 // when open ssl set G
-#define ERROR_OpenSslSetG                504
+#define ERROR_OpenSslSetG                   504
 // when open ssl generate DHKeys
-#define ERROR_OpenSslGenerateDHKeys        505
+#define ERROR_OpenSslGenerateDHKeys         505
 // when open ssl share key already computed.
-#define ERROR_OpenSslShareKeyComputed    506
+#define ERROR_OpenSslShareKeyComputed       506
 // when open ssl get shared key size.
-#define ERROR_OpenSslGetSharedKeySize    507
+#define ERROR_OpenSslGetSharedKeySize       507
 // when open ssl get peer public key.
-#define ERROR_OpenSslGetPeerPublicKey    508
+#define ERROR_OpenSslGetPeerPublicKey       508
 // when open ssl compute shared key.
-#define ERROR_OpenSslComputeSharedKey    509
+#define ERROR_OpenSslComputeSharedKey       509
 // when open ssl is invalid DH state.
-#define ERROR_OpenSslInvalidDHState        510
+#define ERROR_OpenSslInvalidDHState         510
 // when open ssl copy key
-#define ERROR_OpenSslCopyKey            511
+#define ERROR_OpenSslCopyKey                511
 // when open ssl sha256 digest key invalid size.
-#define ERROR_OpenSslSha256DigestSize    512
-
-#define ERROR_HLS_METADATA                600
-#define ERROR_HLS_DECODE_ERROR            601
-#define ERROR_HLS_CREATE_DIR            602
-#define ERROR_HLS_OPEN_FAILED            603
-#define ERROR_HLS_WRITE_FAILED            604
-#define ERROR_HLS_AAC_FRAME_LENGTH        605
-#define ERROR_HLS_AVC_SAMPLE_SIZE        606
-
-#define ERROR_ENCODER_VCODEC            700
-#define ERROR_ENCODER_OUTPUT            701
-#define ERROR_ENCODER_ACHANNELS            702
-#define ERROR_ENCODER_ASAMPLE_RATE        703
-#define ERROR_ENCODER_ABITRATE            704
-#define ERROR_ENCODER_ACODEC            705
-#define ERROR_ENCODER_VPRESET            706
-#define ERROR_ENCODER_VPROFILE            707
-#define ERROR_ENCODER_VTHREADS            708
-#define ERROR_ENCODER_VHEIGHT            709
-#define ERROR_ENCODER_VWIDTH            710
-#define ERROR_ENCODER_VFPS                711
-#define ERROR_ENCODER_VBITRATE            712
-#define ERROR_ENCODER_FORK                713
-#define ERROR_ENCODER_LOOP                714
-#define ERROR_ENCODER_OPEN                715
-#define ERROR_ENCODER_DUP2                716
-
-#define ERROR_HTTP_PARSE_URI            800
-#define ERROR_HTTP_DATA_INVLIAD            801
-#define ERROR_HTTP_PARSE_HEADER            802
+#define ERROR_OpenSslSha256DigestSize       512
+
+#define ERROR_HLS_METADATA                  600
+#define ERROR_HLS_DECODE_ERROR              601
+#define ERROR_HLS_CREATE_DIR                602
+#define ERROR_HLS_OPEN_FAILED               603
+#define ERROR_HLS_WRITE_FAILED              604
+#define ERROR_HLS_AAC_FRAME_LENGTH          605
+#define ERROR_HLS_AVC_SAMPLE_SIZE           606
+
+#define ERROR_ENCODER_VCODEC                700
+#define ERROR_ENCODER_OUTPUT                701
+#define ERROR_ENCODER_ACHANNELS             702
+#define ERROR_ENCODER_ASAMPLE_RATE          703
+#define ERROR_ENCODER_ABITRATE              704
+#define ERROR_ENCODER_ACODEC                705
+#define ERROR_ENCODER_VPRESET               706
+#define ERROR_ENCODER_VPROFILE              707
+#define ERROR_ENCODER_VTHREADS              708
+#define ERROR_ENCODER_VHEIGHT               709
+#define ERROR_ENCODER_VWIDTH                710
+#define ERROR_ENCODER_VFPS                  711
+#define ERROR_ENCODER_VBITRATE              712
+#define ERROR_ENCODER_FORK                  713
+#define ERROR_ENCODER_LOOP                  714
+#define ERROR_ENCODER_OPEN                  715
+#define ERROR_ENCODER_DUP2                  716
+
+#define ERROR_HTTP_PARSE_URI                800
+#define ERROR_HTTP_DATA_INVLIAD             801
+#define ERROR_HTTP_PARSE_HEADER             802
 
 // system control message, 
 // not an error, but special control logic.
 // sys ctl: rtmp close stream, support replay.
-#define ERROR_CONTROL_RTMP_CLOSE        900
+#define ERROR_CONTROL_RTMP_CLOSE            900
 // FMLE stop publish and republish.
-#define ERROR_CONTROL_REPUBLISH            901
+#define ERROR_CONTROL_REPUBLISH             901
 
 /**
 * whether the error code is an system control error.

@@ -91,6 +91,10 @@ int main(int argc, char** argv)
     
     // TODO: create log dir in _srs_config->get_log_dir()
     
+    if ((ret = _srs_server->acquire_pid_file()) != ERROR_SUCCESS) {
+        return ret;
+    }
+    
     if ((ret = _srs_server->listen()) != ERROR_SUCCESS) {
         return ret;
     }