fix bug #162, requires epoll. 0.9.222

@@ -208,6 +208,7 @@ Supported operating systems and hardware:
 * 2013-10-17, Created.<br/>
 
 ## History
+* v1.0, 2014-09-30, fix [#162](https://github.com/winlinvip/simple-rtmp-server/issues/162), failed if no epoll. 0.9.222.
 * v1.0, 2014-09-30, fix [#180](https://github.com/winlinvip/simple-rtmp-server/issues/180), crash for multiple edge publishing the same stream. 0.9.220.
 * v1.0, 2014-09-26, fix hls bug, refine config and log, according to clion of jetbrains. 0.9.216. 
 * v1.0, 2014-09-25, fix [#177](https://github.com/winlinvip/simple-rtmp-server/issues/177), dvr segment add config dvr_wait_keyframe. 0.9.213.

@@ -528,20 +528,11 @@ int SrsServer::initialize_st()
 {
     int ret = ERROR_SUCCESS;
     
-    // use linux epoll.
-    if (st_set_eventsys(ST_EVENTSYS_ALT) == -1) {
-        ret = ERROR_ST_SET_EPOLL;
-        srs_error("st_set_eventsys use linux epoll failed. ret=%d", ret);
+    // init st
+    if ((ret = srs_init_st()) != ERROR_SUCCESS) {
+        srs_error("init st failed. ret=%d", ret);
         return ret;
     }
-    srs_verbose("st_set_eventsys use linux epoll success");
-    
-    if(st_init() != 0){
-        ret = ERROR_ST_INITIALIZE;
-        srs_error("st_init failed. ret=%d", ret);
-        return ret;
-    }
-    srs_verbose("st_init success");
     
     // @remark, st alloc segment use mmap, which only support 32757 threads,
     // if need to support more, for instance, 100k threads, define the macro MALLOC_STACK.

@@ -23,6 +23,52 @@ CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 
 #include <srs_app_st.hpp>
 
+#include <srs_kernel_error.hpp>
+#include <srs_kernel_log.hpp>
+
+#include <sys/epoll.h>
+bool srs_st_epoll_is_supported(void)
+{
+    struct epoll_event ev;
+
+    ev.events = EPOLLIN;
+    ev.data.ptr = NULL;
+    /* Guaranteed to fail */
+    epoll_ctl(-1, EPOLL_CTL_ADD, -1, &ev);
+
+    return (errno != ENOSYS);
+}
+
+int srs_init_st()
+{
+    int ret = ERROR_SUCCESS;
+    
+    // check epoll, some old linux donot support epoll.
+    // @see https://github.com/winlinvip/simple-rtmp-server/issues/162
+    if (!srs_st_epoll_is_supported()) {
+        ret = ERROR_ST_SET_EPOLL;
+        srs_error("epoll required. ret=%d", ret);
+        return ret;
+    }
+    
+    // use linux epoll.
+    if (st_set_eventsys(ST_EVENTSYS_ALT) == -1) {
+        ret = ERROR_ST_SET_EPOLL;
+        srs_error("st_set_eventsys use linux epoll failed. ret=%d", ret);
+        return ret;
+    }
+    srs_verbose("st_set_eventsys use linux epoll success");
+    
+    if(st_init() != 0){
+        ret = ERROR_ST_INITIALIZE;
+        srs_error("st_init failed. ret=%d", ret);
+        return ret;
+    }
+    srs_verbose("st_init success");
+    
+    return ret;
+}
+
 void srs_close_stfd(st_netfd_t& stfd)
 {
     if (stfd) {

@@ -32,6 +32,9 @@ CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 
 #include <st.h>
 
+// initialize st, requires epoll.
+extern int srs_init_st();
+
 // close the netfd, and close the underlayer fd.
 extern void srs_close_stfd(st_netfd_t& stfd);
 

@@ -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 "221"
+#define VERSION_REVISION "222"
 #define RTMP_SIG_SRS_VERSION VERSION_MAJOR"."VERSION_MINOR"."VERSION_REVISION
 // server info.
 #define RTMP_SIG_SRS_KEY "SRS"