/*
       *	Wrapper functions for 16bit uid back compatibility. All nicely tied
       *	together in the faint hope we can take the out in five years time.
       */
      
      #include <linux/mm.h>
      #include <linux/utsname.h>
      #include <linux/mman.h>
      #include <linux/smp_lock.h>
      #include <linux/notifier.h>
      #include <linux/reboot.h>
      #include <linux/prctl.h>
      #include <linux/init.h>
      #include <linux/highuid.h>
      
      #include <asm/uaccess.h>
      
      extern asmlinkage long sys_chown(const char *, uid_t,gid_t);
      extern asmlinkage long sys_lchown(const char *, uid_t,gid_t);
      extern asmlinkage long sys_fchown(unsigned int, uid_t,gid_t);
      extern asmlinkage long sys_setregid(gid_t, gid_t);
      extern asmlinkage long sys_setgid(gid_t);
      extern asmlinkage long sys_setreuid(uid_t, uid_t);
      extern asmlinkage long sys_setuid(uid_t);
      extern asmlinkage long sys_setresuid(uid_t, uid_t, uid_t);
      extern asmlinkage long sys_setresgid(gid_t, gid_t, gid_t);
      extern asmlinkage long sys_setfsuid(uid_t);
      extern asmlinkage long sys_setfsgid(gid_t);
       
  30  asmlinkage long sys_chown16(const char * filename, old_uid_t user, old_gid_t group)
      {
  32  	return sys_chown(filename, low2highuid(user), low2highgid(group));
      }
      
  35  asmlinkage long sys_lchown16(const char * filename, old_uid_t user, old_gid_t group)
      {
  37  	return sys_lchown(filename, low2highuid(user), low2highgid(group));
      }
      
  40  asmlinkage long sys_fchown16(unsigned int fd, old_uid_t user, old_gid_t group)
      {
  42  	return sys_fchown(fd, low2highuid(user), low2highgid(group));
      }
      
  45  asmlinkage long sys_setregid16(old_gid_t rgid, old_gid_t egid)
      {
  47  	return sys_setregid(low2highgid(rgid), low2highgid(egid));
      }
      
  50  asmlinkage long sys_setgid16(old_gid_t gid)
      {
  52  	return sys_setgid((gid_t)gid);
      }
      
  55  asmlinkage long sys_setreuid16(old_uid_t ruid, old_uid_t euid)
      {
  57  	return sys_setreuid(low2highuid(ruid), low2highuid(euid));
      }
      
  60  asmlinkage long sys_setuid16(old_uid_t uid)
      {
  62  	return sys_setuid((uid_t)uid);
      }
      
  65  asmlinkage long sys_setresuid16(old_uid_t ruid, old_uid_t euid, old_uid_t suid)
      {
      	return sys_setresuid(low2highuid(ruid), low2highuid(euid),
  68  		low2highuid(suid));
      }
      
  71  asmlinkage long sys_getresuid16(old_uid_t *ruid, old_uid_t *euid, old_uid_t *suid)
      {
      	int retval;
      
      	if (!(retval = put_user(high2lowuid(current->uid), ruid)) &&
  76  	    !(retval = put_user(high2lowuid(current->euid), euid)))
      		retval = put_user(high2lowuid(current->suid), suid);
      
  79  	return retval;
      }
      
  82  asmlinkage long sys_setresgid16(old_gid_t rgid, old_gid_t egid, old_gid_t sgid)
      {
      	return sys_setresgid(low2highgid(rgid), low2highgid(egid),
  85  		low2highgid(sgid));
      }
      
  88  asmlinkage long sys_getresgid16(old_gid_t *rgid, old_gid_t *egid, old_gid_t *sgid)
      {
      	int retval;
      
      	if (!(retval = put_user(high2lowgid(current->gid), rgid)) &&
  93  	    !(retval = put_user(high2lowgid(current->egid), egid)))
      		retval = put_user(high2lowgid(current->sgid), sgid);
      
  96  	return retval;
      }
      
  99  asmlinkage long sys_setfsuid16(old_uid_t uid)
      {
 101  	return sys_setfsuid((uid_t)uid);
      }
      
 104  asmlinkage long sys_setfsgid16(old_gid_t gid)
      {
 106  	return sys_setfsgid((gid_t)gid);
      }
      
 109  asmlinkage long sys_getgroups16(int gidsetsize, old_gid_t *grouplist)
      {
      	old_gid_t groups[NGROUPS];
      	int i,j;
      
 114  	if (gidsetsize < 0)
 115  		return -EINVAL;
      	i = current->ngroups;
 117  	if (gidsetsize) {
 118  		if (i > gidsetsize)
 119  			return -EINVAL;
 120  		for(j=0;j<i;j++)
      			groups[j] = current->groups[j];
 122  		if (copy_to_user(grouplist, groups, sizeof(old_gid_t)*i))
 123  			return -EFAULT;
      	}
 125  	return i;
      }
      
 128  asmlinkage long sys_setgroups16(int gidsetsize, old_gid_t *grouplist)
      {
      	old_gid_t groups[NGROUPS];
      	int i;
      
 133  	if (!capable(CAP_SETGID))
 134  		return -EPERM;
 135  	if ((unsigned) gidsetsize > NGROUPS)
 136  		return -EINVAL;
 137  	if (copy_from_user(groups, grouplist, gidsetsize * sizeof(old_gid_t)))
 138  		return -EFAULT;
 139  	for (i = 0 ; i < gidsetsize ; i++)
      		current->groups[i] = (gid_t)groups[i];
      	current->ngroups = gidsetsize;
 142  	return 0;
      }
      
 145  asmlinkage long sys_getuid16(void)
      {
 147  	return high2lowuid(current->uid);
      }
      
 150  asmlinkage long sys_geteuid16(void)
      {
 152  	return high2lowuid(current->euid);
      }
      
 155  asmlinkage long sys_getgid16(void)
      {
 157  	return high2lowgid(current->gid);
      }
      
 160  asmlinkage long sys_getegid16(void)
      {
 162  	return high2lowgid(current->egid);
      }