c++ signal实现发送信号

#include <iostream>
#include <string>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <signal.h>
 
 
 void DoCmdGetPid(const std::string& cmd, std::string& stringPid)
 {
   FILE *pFile = popen(cmd.c_str(), "r");
   char *buff = new char[256];
   memset(buff, 0, sizeof(buff));
   fread(buff, 1, sizeof(buff), pFile);
   stringPid = buff;
   pclose(pFile);
   delete[] buff;
 }
 
 void SendSig()
 {
   const std::string& procName = "recv";
   std::string cmd = "ps -a | grep " + procName + " |grep -v grep | awk '{print $2}'";
   std::string strPid;
   DoCmdGetPid(cmd, strPid);
 
   if (strPid.empty()) {
	   std::cout << "not process\n";
	   return;
	}
 
   // 通过kill 函数发送信号
   kill(std::stoi(strPid), 38);
   return;
 }
 
 int main()
 {
   while (1) {
     SendSig();
     sleep(5);
   }
 
   return 0;
}