ignore child process when exec

src/common/spawn.cpp

@@ -35,6 +35,7 @@
 #include <windows.h>
 #else
 #include <sys/wait.h>
+#include <signal.h>
 #endif
 
 #include "misc_log_ex.h"
@@ -114,7 +115,10 @@ int spawn(const char *filename, const std::vector<std::string>& args, bool wait)
   if (pid > 0)
   {
     if (!wait)
+    {
+      signal(SIGCHLD, SIG_IGN);
       return 0;
+    }
 
     while (1)
     {