bugfix: singleton process

opencv-motion-detect/singprocess.hpp

+#include <netinet/in.h>
+
+class SingletonProcess {
+private:
+    uint16_t name2port(string name)
+    {
+        uint16_t ret = 41070;
+        if(name == "evdaemon") {
+            //
+        }
+        else if(name == "evmgr") {
+            ret +=100;
+        }
+        else if(name == "evpuller") {
+            ret +=200;
+        }
+        else if(name == "evpusher") {
+            ret +=300;
+        }
+        else if(name == "evslicer") {
+            ret +=400;
+        }
+        else if(name == "evmlmotion") {
+            ret +=500;
+        }
+        else if(name == "evwifi") {
+            ret +=600;
+        }
+        else {
+            ret += 900;
+        }
+
+        return ret;
+    }
+public:
+    SingletonProcess(uint16_t port0)
+        : socket_fd(-1)
+        , rc(1)
+        , port(port0)
+    {
+    }
+
+    SingletonProcess(string moduName, uint16_t iid)
+        : socket_fd(-1)
+        , rc(1)
+    {
+        port = name2port(moduName) + iid;
+    }
+
+    ~SingletonProcess()
+    {
+        if (socket_fd != -1) {
+            close(socket_fd);
+        }
+    }
+
+    bool operator()()
+    {
+        if (socket_fd == -1 || rc) {
+            socket_fd = -1;
+            rc = 1;
+
+            if ((socket_fd = socket(AF_INET, SOCK_DGRAM, 0)) < 0) {
+                throw std::runtime_error(std::string("Could not create socket: ") +  strerror(errno));
+            }
+            else {
+                struct sockaddr_in name;
+                name.sin_family = AF_INET;
+                name.sin_port = htons (port);
+                name.sin_addr.s_addr = htonl (INADDR_ANY);
+                rc = ::bind(socket_fd, (struct sockaddr *) &name, sizeof (name));
+            }
+        }
+        return (socket_fd != -1 && rc == 0);
+    }
+
+    std::string GetLockFileName()
+    {
+        return std::to_string(port);
+    }
+
+private:
+    int socket_fd = -1;
+    int rc;
+    uint16_t port;
+};
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