fix bug #34: convert signal to io. 0.9.85

@@ -70,6 +70,8 @@ CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 //      SRS_SYS_CYCLE_INTERVAL * SRS_SYS_MEMINFO_RESOLUTION_TIMES
 #define SRS_SYS_MEMINFO_RESOLUTION_TIMES 60
 
+#define SRS_SIGNAL_THREAD_INTERVAL  (int64_t)(100*1000LL)
+
 SrsListener::SrsListener(SrsServer* server, SrsListenerType type)
 {
     fd = -1;
@@ -184,12 +186,117 @@ int SrsListener::cycle()
     return ret;
 }
 
+SrsSignalManager* SrsSignalManager::instance = NULL;
+
+SrsSignalManager::SrsSignalManager(SrsServer* server)
+{
+    SrsSignalManager::instance = this;
+    
+    _server = server;
+    sig_pipe[0] = sig_pipe[1] = -1;
+    pthread = new SrsThread(this, SRS_SIGNAL_THREAD_INTERVAL);
+    signal_read_stfd = NULL;
+}
+
+SrsSignalManager::~SrsSignalManager()
+{
+    pthread->stop();
+    srs_freep(pthread);
+    
+    srs_close_stfd(signal_read_stfd);
+    
+    if (sig_pipe[0] > 0) {
+        ::close(sig_pipe[0]);
+    }
+    if (sig_pipe[1] > 0) {
+        ::close(sig_pipe[1]);
+    }
+}
+
+int SrsSignalManager::initialize()
+{
+    int ret = ERROR_SUCCESS;
+    return ret;
+}
+
+int SrsSignalManager::start()
+{
+    int ret = ERROR_SUCCESS;
+    
+    /**
+    * Note that if multiple processes are used (see below), 
+    * the signal pipe should be initialized after the fork(2) call 
+    * so that each process has its own private pipe.
+    */
+    struct sigaction sa;
+    
+    /* Create signal pipe */
+    if (pipe(sig_pipe) < 0) {
+        ret = ERROR_SYSTEM_CREATE_PIPE;
+        srs_error("create signal manager pipe failed. ret=%d", ret);
+        return ret;
+    }
+    
+    /* Install sig_catcher() as a signal handler */
+    sa.sa_handler = SrsSignalManager::sig_catcher;
+    sigemptyset(&sa.sa_mask);
+    sa.sa_flags = 0;
+    sigaction(SIGNAL_RELOAD, &sa, NULL);
+    
+    sa.sa_handler = SrsSignalManager::sig_catcher;
+    sigemptyset(&sa.sa_mask);
+    sa.sa_flags = 0;
+    sigaction(SIGTERM, &sa, NULL);
+    
+    sa.sa_handler = SrsSignalManager::sig_catcher;
+    sigemptyset(&sa.sa_mask);
+    sa.sa_flags = 0;
+    sigaction(SIGINT, &sa, NULL);
+    
+    return pthread->start();
+}
+
+int SrsSignalManager::cycle()
+{
+    int ret = ERROR_SUCCESS;
+    
+    if (signal_read_stfd == NULL) {
+        signal_read_stfd = st_netfd_open(sig_pipe[0]);
+    }
+
+    int signo;
+    
+    /* Read the next signal from the pipe */
+    st_read(signal_read_stfd, &signo, sizeof(int), ST_UTIME_NO_TIMEOUT);
+    
+    /* Process signal synchronously */
+    _server->on_signal(signo);
+    
+    return ret;
+}
+
+void SrsSignalManager::sig_catcher(int signo)
+{
+    int err;
+    
+    /* Save errno to restore it after the write() */
+    err = errno;
+    
+    /* write() is reentrant/async-safe */
+    int fd = SrsSignalManager::instance->sig_pipe[1];
+    write(fd, &signo, sizeof(int));
+    
+    errno = err;
+}
+
 SrsServer::SrsServer()
 {
     signal_reload = false;
     signal_gmc_stop = false;
     pid_fd = -1;
     
+    signal_manager = new SrsSignalManager(this);
+    
     // donot new object in constructor,
     // for some global instance is not ready now,
     // new these objects in initialize instead.
@@ -226,6 +333,8 @@ SrsServer::~SrsServer()
         pid_fd = -1;
     }
     
+    srs_freep(signal_manager);
+    
 #ifdef SRS_AUTO_HTTP_API
     srs_freep(http_api_handler);
 #endif
@@ -276,6 +385,11 @@ int SrsServer::initialize()
     return ret;
 }
 
+int SrsServer::initialize_signal()
+{
+    return signal_manager->initialize();
+}
+
 int SrsServer::acquire_pid_file()
 {
     int ret = ERROR_SUCCESS;
@@ -397,6 +511,12 @@ int SrsServer::listen()
     return ret;
 }
 
+int SrsServer::register_signal()
+{
+    // start signal process thread.
+    return signal_manager->start();
+}
+
 int SrsServer::ingest()
 {
     int ret = ERROR_SUCCESS;

@@ -64,7 +64,7 @@ private:
     SrsServer* _server;
     SrsThread* pthread;
 public:
-    SrsListener(SrsServer* _server, SrsListenerType type);
+    SrsListener(SrsServer* server, SrsListenerType type);
     virtual ~SrsListener();
 public:
     virtual SrsListenerType type();
@@ -75,9 +75,39 @@ public:
     virtual int cycle();
 };
 
+/**
+* convert signal to io,
+* @see: st-1.9/docs/notes.html
+*/
+class SrsSignalManager : public ISrsThreadHandler
+{
+private:
+    /* Per-process pipe which is used as a signal queue. */
+    /* Up to PIPE_BUF/sizeof(int) signals can be queued up. */
+    int sig_pipe[2];
+    st_netfd_t signal_read_stfd;
+private:
+    SrsServer* _server;
+    SrsThread* pthread;
+public:
+    SrsSignalManager(SrsServer* server);
+    virtual ~SrsSignalManager();
+public:
+    virtual int initialize();
+    virtual int start();
+// interface ISrsThreadHandler.
+public:
+    virtual int cycle();
+private:
+    // global singleton instance
+    static SrsSignalManager* instance;
+    /* Signal catching function. */
+    /* Converts signal event to I/O event. */
+    static void sig_catcher(int signo);
+};
+
 class SrsServer : public ISrsReloadHandler
 {
-    friend class SrsListener;
 private:
 #ifdef SRS_AUTO_HTTP_API
     SrsHttpHandler* http_api_handler;
@@ -92,6 +122,7 @@ private:
     int pid_fd;
     std::vector<SrsConnection*> conns;
     std::vector<SrsListener*> listeners;
+    SrsSignalManager* signal_manager;
     bool signal_reload;
     bool signal_gmc_stop;
 public:
@@ -99,9 +130,11 @@ public:
     virtual ~SrsServer();
 public:
     virtual int initialize();
+    virtual int initialize_signal();
     virtual int acquire_pid_file();
     virtual int initialize_st();
     virtual int listen();
+    virtual int register_signal();
     virtual int ingest();
     virtual int cycle();
     virtual void remove(SrsConnection* conn);
@@ -111,6 +144,8 @@ private:
     virtual int listen_http_api();
     virtual int listen_http_stream();
     virtual void close_listeners(SrsListenerType type);
+// internal only
+public:
     virtual int accept_client(SrsListenerType type, st_netfd_t client_stfd);
 // interface ISrsThreadHandler.
 public:

@@ -31,7 +31,7 @@ CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 // current release version
 #define VERSION_MAJOR "0"
 #define VERSION_MINOR "9"
-#define VERSION_REVISION "84"
+#define VERSION_REVISION "85"
 #define RTMP_SIG_SRS_VERSION VERSION_MAJOR"."VERSION_MINOR"."VERSION_REVISION
 // server info.
 #define RTMP_SIG_SRS_KEY "srs"

@@ -114,6 +114,7 @@ CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #define ERROR_SYSTEM_FILE_WRITE             427
 #define ERROR_SYSTEM_FILE_EOF               428
 #define ERROR_SYSTEM_FILE_RENAME            429
+#define ERROR_SYSTEM_CREATE_PIPE            430
 
 // see librtmp.
 // failed when open ssl create the dh

@@ -24,8 +24,6 @@ CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #include <srs_core.hpp>
 
 #include <stdlib.h>
-#include <signal.h>
-
 #include <sys/types.h>
 #include <sys/wait.h>
 
@@ -56,13 +54,6 @@ ISrsThreadContext* _srs_context = new SrsThreadContext();
 SrsConfig* _srs_config = new SrsConfig();
 SrsServer* _srs_server = new SrsServer();
 
-// signal handler
-void handler(int signo)
-{
-    srs_trace("get a signal, signo=%d", signo);
-    _srs_server->on_signal(signo);
-}
-
 // main entrance.
 int main(int argc, char** argv) 
 {
@@ -166,9 +157,9 @@ int run_master()
 {
     int ret = ERROR_SUCCESS;
     
-    signal(SIGNAL_RELOAD, handler);
-    signal(SIGTERM, handler);
-    signal(SIGINT, handler);
+    if ((ret = _srs_server->initialize_signal()) != ERROR_SUCCESS) {
+        return ret;
+    }
     
     if ((ret = _srs_server->acquire_pid_file()) != ERROR_SUCCESS) {
         return ret;
@@ -182,6 +173,10 @@ int run_master()
         return ret;
     }
     
+    if ((ret = _srs_server->register_signal()) != ERROR_SUCCESS) {
+        return ret;
+    }
+    
     if ((ret = _srs_server->ingest()) != ERROR_SUCCESS) {
         return ret;
     }