now use setreuid()

check.c

@@ -82,10 +82,10 @@ void check_user()
 	exit(1);
     }
     rtn = check_timestamp();
-    if (setruid(uid)) {		/* don't want to be root longer than
-				 * necessary */
+    /* don't want to be root longer than necessary */
+    if (setreuid(uid, (uid_t)-1)) {
 #ifndef _AIX
-	perror("setruid(uid)");
+	perror("setreuid()");
 	exit(1);
 #endif
     }
@@ -97,10 +97,10 @@ void check_user()
 	exit(1);
     }
     update_timestamp();
-    if (setruid(uid)) {		/* don't want to be root longer than
-				 * necessary */
+    /* don't want to be root longer than necessary */
+    if (setreuid(uid, (uid_t)-1)) {
 #ifndef _AIX
-	perror("setruid(uid)");
+	perror("setreuid()");
 	exit(1);
 #endif
     }

sudo.c

@@ -131,9 +131,9 @@ main(argc, argv, envp)
 	exit(1);
     }
     rtn = validate();
-    if (setruid(uid)) {
+    if (setreuid(uid, (uid_t)-1)) {
 #ifndef _AIX
-	perror("setruid(uid)");
+	perror("setreuid()");
 	exit(1);
 #endif
     }

sudo.h

@@ -289,18 +289,11 @@ extern char **Envp;
 #endif
 extern int errno;
 
-/*
- * Emulate setruid() under linux
- */
-#ifdef linux
-#define setruid(__RUID) (setreuid((uid_t) (__RUID), (uid_t) -1))
-#endif /* linux */
-
 /*
  * This is to placate hpux
  */
 #ifdef hpux
-#define setruid(__RUID)  (setresuid((uid_t) (__RUID), (uid_t) -1, (uid_t) -1))
+#define setreuid(__RUID, __EUID)	(setresuid(__RUID, __EUID, (uid_t) -1))
 #define getdtablesize()	(sysconf(_SC_OPEN_MAX))
 #ifndef USE_CWD
 #define USE_CWD