如何在C中删除linux上的root权限？

Question

I'd like to fork and exec and program as a non root user while the parent retains root permissions.

pseudo code:

  pid = fork();

  if (pid == 0) {
      if (RunAsUser(ConvertStringToUserId("John")) == false) {
          stop();
      }
      if (RunAsUser(ConvertStringToUserId("admin")) == true) {
          stop();
      }
      CreateProcess();
  }

Answer 1

如果要删除C代码中的权限，请使用setuid函数。

Answer 2

Get your program to invoke the child process as

sudo -u user /path/to/externalprogram

instead of just

/path/to/externalprogram