程序在 execvp(command.argv[0], command.argv) 后停止

I am writing a small shell program that takes a command and executes it. If the user enters a not valid command the if statement returns a -1. If the command is correct it executes the command, however once it executes the command the program ends. What am I doing wrong that is does not execute the lines of code after it? I have tested execvp( command.argv[0], command.argv) with ls and cat commands so I am pretty sure it works. Here is my code.

  int shell(char *cmd_str ){
  int commandLength=0;
  cmd_t command;
  commandLength=make_cmd(cmd_str,  command);
  cout<< commandLength<<endl;
  cout << command.argv[0]<< endl;
  if( execvp( command.argv[0], command.argv)==-1)
//if the command it executed nothing runs after this line
  {
    commandLength=-1;

}else
{
  cout<<"work"<<endl;
}

  cout<< commandLength<<endl;
   return commandLength;


}

推荐答案

来自 手册页 execvp(3)

exec() 系列函数将当前进程映像替换为一个新的过程映像