C ++获取在后台运行的进程失败

Question

I'm starting a script from my app and using & at the end of the command to run the process in the background:

std::string pCommand = "python myscript.py &";
int ret = system(pCommand.c_str());

if (ret == 0)
{
    //No error, continue...
}

However even if the script fails, the return from system() is always 0. If I remove the & so it does not run in the background, then I do get the correct exit code on failure.

Is there a way to detect if the process failed, or is that simply not possible when executing a background process with system() ?

Answer 1

如果在后台运行它，请在脚本结束之前检查ret的值，而ret的默认值可能是0。