text: #include "types.h"
  #include "defs.h"
  #include "param.h"
  #include "stat.h"
  #include "mmu.h"
  #include "proc.h"
  #include "param.h"
  #include "spinlock.h"
  #include "sleeplock.h"
  #include "fs.h"
  #include "file.h"
  
  int
  sys_unshare(void) {
      int nstype;
      if (argint(0, &nstype) < 0) {
          return -1;
      }
  
      return unshare(nstype);
  }