Patch for seteuid/setegid

[Ulrich Kuehn <kuehn@GOEDEL.UNI-MUENSTER.DE>]

Hello!

Here is a patch that implements Pseteuid()/Psetegid(), which are needed
for an nfs daemon to do access checking (and probably for a lot of other
things). So I would like this patch making its way into the next release
of mint.

diff -ur old/dos.c ./dos.c
--- old/dos.c	Fri May  6 23:46:04 1994
+++ ./dos.c	Sat May  7 00:02:34 1994
@@ -208,6 +208,31 @@
 	return EACCDN;
 }
 
+
+/* uk: set effective uid/gid but leave the real uid/gid unchanged. */
+long ARGS_ON_STACK
+p_seteuid(id)
+	int id;
+{
+	if (curproc->euid == 0 || curproc->ruid	== id) {
+		curproc->euid = id;
+		return id;
+	}
+	return EACCDN;
+}
+	
+long ARGS_ON_STACK
+p_setegid(id)
+	int id;
+{
+	if (curproc->euid == 0 || curproc->egid == 0 || curproc->rgid == id) {
+		curproc->egid = id;
+		return id;
+	}
+	return EACCDN;
+}
+
+
 /*
  * a way to get/set process-specific user information. the user information
  * longword is set to "arg", unless arg is -1. In any case, the old
@@ -623,4 +648,6 @@
 	dos_tab[0x13e] = p_sigintr;
 	dos_tab[0x13f] = s_uptime;
 	dos_tab[0x142] = d_xreaddir;
+	dos_tab[0x143] = p_seteuid;
+	dos_tab[0x144] = p_setegid;
 }
diff -ur old/proto.h ./proto.h
--- old/proto.h	Fri May  6 23:55:06 1994
+++ ./proto.h	Fri May  6 23:56:02 1994
@@ -78,6 +78,8 @@
 long ARGS_ON_STACK p_getegid P_((void));
 long ARGS_ON_STACK p_setuid P_((int id));
 long ARGS_ON_STACK p_setgid P_((int id));
+long ARGS_ON_STACK p_seteuid P_((int id));
+long ARGS_ON_STACK p_setegid P_((int id));
 long ARGS_ON_STACK p_usrval P_((long arg));
 long ARGS_ON_STACK p_umask P_((unsigned mode));
 long ARGS_ON_STACK p_domain P_((int arg));

Regards,
Ulrich

p.s.: Thorsten, sorry, but I think You have to choose some other function
      numbers for Your patch :)

--
+---------------+----------------------------+-----------------------+
| Ulrich Kuehn  | Internet:                  | Life is uncertain --  |
| Cand.Math.Inf | kuehn@math.uni-muenster.de | eat the dessert first |
+---------------+----------------------------+-----------------------+