for #374, use SIGINT then SIGKILL to try to kill FFMPEG gracefullly.

@@ -35,6 +35,7 @@ using namespace std;
 #include <srs_kernel_error.hpp>
 #include <srs_kernel_log.hpp>
 #include <srs_app_config.hpp>
+#include <srs_app_utility.hpp>
 
 #ifdef SRS_AUTO_FFMPEG_STUB
 
@@ -509,24 +510,14 @@ void SrsFFMPEG::stop()
     // when rewind, upstream will stop publish(unpublish),
     // unpublish event will stop all ffmpeg encoders,
     // then publish will start all ffmpeg encoders.
-    if (pid > 0) {
-        if (kill(pid, SIGKILL) < 0) {
-            srs_warn("kill the encoder failed, ignored. pid=%d", pid);
-        }
-        
-        // wait for the ffmpeg to quit.
-        // ffmpeg will gracefully quit if signal is:
-        //         1) SIGHUP     2) SIGINT     3) SIGQUIT
-        // other signals, directly exit(123), for example:
-        //        9) SIGKILL    15) SIGTERM
-        int status = 0;
-        if (waitpid(pid, &status, 0) < 0) {
-            srs_warn("wait the encoder quit failed, ignored. pid=%d", pid);
-        }
-        
-        srs_trace("stop the encoder success. pid=%d", pid);
-        pid = -1;
+    int ret = srs_kill_forced(pid);
+    if (ret != ERROR_SUCCESS) {
+        srs_warn("ignore kill the encoder failed, pid=%d. ret=%d", pid, ret);
+        return;
     }
+    
+    // terminated, set started to false to stop the cycle.
+    started = false;
 }
 
 #endif

@@ -27,6 +27,7 @@ CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #include <unistd.h>
 #include <ifaddrs.h>
 #include <arpa/inet.h>
+#include <signal.h>
 
 #ifdef SRS_OSX
 #include <sys/sysctl.h>
@@ -222,6 +223,63 @@ void srs_parse_endpoint(string ip_port, string& ip, int& port)
     port = ::atoi(the_port.c_str());
 }
 
+#define SRS_PROCESS_QUIT_TIMEOUT_MS 1000
+int srs_kill_forced(int& pid)
+{
+    int ret = ERROR_SUCCESS;
+    
+    if (pid <= 0) {
+        return ret;
+    }
+    
+    // first, try kill by SIGINT.
+    if (kill(pid, SIGINT) < 0) {
+        return ERROR_SYSTEM_KILL;
+    }
+    
+    // wait to quit.
+    srs_trace("send SIGINT to pid=%d", pid);
+    for (int i = 0; i < SRS_PROCESS_QUIT_TIMEOUT_MS / 10; i++) {
+        int status = 0;
+        pid_t qpid = -1;
+        if ((qpid = waitpid(pid, &status, WNOHANG)) < 0) {
+            return ERROR_SYSTEM_KILL;
+        }
+        
+        // 0 is not quit yet.
+        if (qpid == 0) {
+            st_usleep(10 * 1000);
+            continue;
+        }
+        
+        // killed, set pid to -1.
+        srs_trace("SIGINT stop process pid=%d ok.", pid);
+        pid = -1;
+        
+        return ret;
+    }
+
+    // then, try kill by SIGKILL.
+    if (kill(pid, SIGKILL) < 0) {
+        return ERROR_SYSTEM_KILL;
+    }
+    
+    // wait for the process to quit.
+    // for example, ffmpeg will gracefully quit if signal is:
+    //         1) SIGHUP     2) SIGINT     3) SIGQUIT
+    // other signals, directly exit(123), for example:
+    //        9) SIGKILL    15) SIGTERM
+    int status = 0;
+    if (waitpid(pid, &status, 0) < 0) {
+        return ERROR_SYSTEM_KILL;
+    }
+    
+    srs_trace("SIGKILL stop process pid=%d ok.", pid);
+    pid = -1;
+    
+    return ret;
+}
+
 static SrsRusage _srs_system_rusage;
 
 SrsRusage::SrsRusage()
@@ -422,7 +480,7 @@ void srs_update_proc_stat()
     // @see https://github.com/simple-rtmp-server/srs/issues/397
     static int user_hz = 0;
     if (user_hz <= 0) {
-        user_hz = sysconf(_SC_CLK_TCK);
+        user_hz = (int)sysconf(_SC_CLK_TCK);
         srs_trace("USER_HZ=%d", user_hz);
         srs_assert(user_hz > 0);
     }
@@ -646,12 +704,12 @@ void srs_update_disk_stat()
         
         if (o.pgpgin > 0 && r.pgpgin > o.pgpgin && duration_ms > 0) {
             // KBps = KB * 1000 / ms = KB/s
-            r.in_KBps = (r.pgpgin - o.pgpgin) * 1000 / duration_ms;
+            r.in_KBps = (int)((r.pgpgin - o.pgpgin) * 1000 / duration_ms);
         }
         
         if (o.pgpgout > 0 && r.pgpgout > o.pgpgout && duration_ms > 0) {
             // KBps = KB * 1000 / ms = KB/s
-            r.out_KBps = (r.pgpgout - o.pgpgout) * 1000 / duration_ms;
+            r.out_KBps = (int)((r.pgpgout - o.pgpgout) * 1000 / duration_ms);
         }
     }
     
@@ -771,8 +829,8 @@ SrsCpuInfo* srs_get_cpuinfo()
     // initialize cpu info.
     cpu = new SrsCpuInfo();
     cpu->ok = true;
-    cpu->nb_processors = sysconf(_SC_NPROCESSORS_CONF);
-    cpu->nb_processors_online = sysconf(_SC_NPROCESSORS_ONLN);
+    cpu->nb_processors = (int)sysconf(_SC_NPROCESSORS_CONF);
+    cpu->nb_processors_online = (int)sysconf(_SC_NPROCESSORS_ONLN);
     
     return cpu;
 }

@@ -80,6 +80,14 @@ extern std::string srs_path_build_timestamp(std::string template_path);
 extern void srs_parse_endpoint(std::string ip_port, std::string& ip, std::string& port);
 extern void srs_parse_endpoint(std::string ip_port, std::string& ip, int& port);
 
+/**
+ * kill the pid by SIGINT, then wait to quit,
+ * kill the pid by SIGKILL again when exceed the timeout.
+ * @param pid the pid to kill. ignore for -1. set to -1 when killed.
+ * @return an int error code.
+ */
+extern int srs_kill_forced(int& pid);
+
 // current process resouce usage.
 // @see: man getrusage
 class SrsRusage

@@ -96,6 +96,7 @@ CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #define ERROR_SYSTEM_TIME                   1055
 #define ERROR_SYSTEM_DIR_EXISTS             1056
 #define ERROR_SYSTEM_CREATE_DIR             1057
+#define ERROR_SYSTEM_KILL                   1058
 
 ///////////////////////////////////////////////////////
 // RTMP protocol error.