ia64/xen-unstable

view extras/mini-os/include/err.h @ 16520:a583f3a7eafc

Revert 16498:d2bef6551c1263e457aef75ce403ba53652a803f.
author Keir Fraser <keir.fraser@citrix.com>
date Tue Dec 04 22:54:58 2007 +0000 (2007-12-04)
parents 06d84bf87159
children 707e10c9a487
line source
1 #ifndef _ERR_H
2 #define _ERR_H
4 #include <errno.h>
6 /*
7 * Kernel pointers have redundant information, so we can use a
8 * scheme where we can return either an error code or a dentry
9 * pointer with the same return value.
10 *
11 * This should be a per-architecture thing, to allow different
12 * error and pointer decisions.
13 */
14 #define IS_ERR_VALUE(x) ((x) > (unsigned long)-1000L)
16 static inline void *ERR_PTR(long error)
17 {
18 return (void *) error;
19 }
21 static inline long PTR_ERR(const void *ptr)
22 {
23 return (long) ptr;
24 }
26 static inline long IS_ERR(const void *ptr)
27 {
28 return IS_ERR_VALUE((unsigned long)ptr);
29 }
31 #endif /* _LINUX_ERR_H */