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compat_sigaltstack.h revision 1.1 
      1 /*      $NetBSD: compat_sigaltstack.h,v 1.1 2007/06/03 14:59:46 dsl Exp $        */
      2 
      3 /* Wrapper for calling sigaltstack1() from compat (or other) code */
      4 
      5 /* Maybe these definitions could be global. */
      6 #ifdef SCARG_P32
      7 /* compat32 */
      8 #define	SCARG_COMPAT_PTR(uap,p)	SCARG_P32(uap, p)
      9 #define	COMPAT_GET_PTR(p)	NETBSD32PTR64(p)
     10 #define	COMPAT_SET_PTR(p, v)	NETBSD32PTR32(p, v)
     11 #else
     12 /* not a size change */
     13 #define	SCARG_COMPAT_PTR(uap,p)	SCARG(uap, p)
     14 #define	COMPAT_GET_PTR(p)	(p)
     15 #define	COMPAT_SET_PTR(p, v)	((p) = (v))
     16 #endif
     17 
     18 #define compat_sigaltstack(uap, compat_ss) do { \
     19 	struct compat_ss css; \
     20 	struct sigaltstack nss, oss; \
     21 	int error; \
     22 \
     23 	if (SCARG_COMPAT_PTR(uap, nss)) { \
     24 		error = copyin(SCARG_COMPAT_PTR(uap, nss), &css, sizeof css); \
     25 		if (error) \
     26 			return error; \
     27 		 nss.ss_sp = COMPAT_GET_PTR(css.ss_sp); \
     28 		 nss.ss_size = css.ss_size; \
     29 		 nss.ss_flags = css.ss_flags; \
     30 	} \
     31 \
     32 	error = sigaltstack1(l, SCARG_COMPAT_PTR(uap, nss) ? &nss : 0, \
     33 				SCARG_COMPAT_PTR(uap, oss) ? &oss : 0); \
     34 	if (error) \
     35 		return (error); \
     36 \
     37 	if (SCARG_COMPAT_PTR(uap, oss)) { \
     38 		COMPAT_SET_PTR(css.ss_sp, oss.ss_sp); \
     39 		css.ss_size = oss.ss_size; \
     40 		css.ss_flags = oss.ss_flags; \
     41 		error = copyout(&css, SCARG_COMPAT_PTR(uap, oss), sizeof(css)); \
     42 		if (error) \
     43 			return (error); \
     44 	} \
     45 	return (0); \
     46 } while (0)
     47