text: #include <stdlib.h>
  #include <unistd.h>
  #include <wait.h>
  #include <sys/types.h>
  #include <sys/wait.h>
  
  int system(const char * command) {
  	char * args[] = {
  		"/bin/sh",
  		"-c",
  		(char *)command,
  		NULL,
  	};
  	pid_t pid = fork();
  	if (!pid) {
  		execvp(args[0], args);
  		exit(1);
  		__builtin_unreachable(); /* With -ffreestanding, gcc doesn't realize exit() doesn't return. */
  	} else {
  		int status;
  		waitpid(pid, &status, 0);
  		return WEXITSTATUS(status);
  	}
  }
  