sys/sys/sysmsg.h

   1 /*
   2  * SYS/SYSMSG.H
   3  *
   4  * $DragonFly: src/sys/sys/sysmsg.h,v 1.12 2008/08/25 23:35:47 dillon Exp $
   5  */
   6
   7 #ifndef _SYS_SYSMSG_H_
   8 #define _SYS_SYSMSG_H_
   9
  10 #ifdef _KERNEL
  11
  12 #ifndef _SYS_TYPES_H_
  13 #include <sys/types.h>
  14 #endif
  15
  16 /*
  17  * The sysmsg holds the kernelland version of a system call's arguments
  18  * and return value.  It typically preceeds the syscall arguments in sysunion
  19  * (see sys/sysunion.h).
  20  *
  21  * WARNING: fds must be long so it translates to two 64 bit registers
  22  * on 64 bit architectures.
  23  */
  24 union sysunion;
  25
  26 struct sysmsg {
  27         union {
  28             void    *resultp;            /* misc pointer data or result */
  29             int     result;              /* standard 'int'eger result */
  30             long    lresult;             /* long result */
  31             long    fds[2];              /* double result */
  32             __int32_t result32;          /* 32 bit result */
  33             __int64_t result64;          /* 64 bit result */
  34             __off_t offset;              /* off_t result */
  35         } sm_result;
  36         struct trapframe *sm_frame;      /* trapframe - saved user context */
  37         void *sm_unused;
  38 };
  39
  40 struct lwp;
  41 union sysunion;
  42
  43 #endif
  44
  45 #ifdef _KERNEL
  46 #define sysmsg_result   sysmsg.sm_result.result
  47 #define sysmsg_lresult  sysmsg.sm_result.lresult
  48 #define sysmsg_resultp  sysmsg.sm_result.resultp
  49 #define sysmsg_fds      sysmsg.sm_result.fds
  50 #define sysmsg_offset   sysmsg.sm_result.offset
  51 #define sysmsg_result32 sysmsg.sm_result.result32
  52 #define sysmsg_result64 sysmsg.sm_result.result64
  53 #define sysmsg_frame    sysmsg.sm_frame
  54 #endif
  55
  56 #endif
  57