include/minix/ipcconst.h

   1 #ifndef _IPC_CONST_H
   2 #define _IPC_CONST_H
   3
   4  /* System call numbers that are passed when trapping to the kernel. */
   5 #define SEND               1    /* blocking send */
   6 #define RECEIVE            2    /* blocking receive */
   7 #define SENDREC            3    /* SEND + RECEIVE */
   8 #define NOTIFY             4    /* asynchronous notify */
   9 #define SENDNB             5    /* nonblocking send */
  10 #define SENDA              16   /* asynchronous send */
  11
  12 /* Macros for IPC status code manipulation. */
  13 #define IPC_STATUS_CALL_SHIFT   0
  14 #define IPC_STATUS_CALL_MASK    0x3F
  15 #define IPC_STATUS_CALL(status) \
  16         (((status) >> IPC_STATUS_CALL_SHIFT) & IPC_STATUS_CALL_MASK)
  17 #define IPC_STATUS_CALL_TO(call) \
  18         (((call) & IPC_STATUS_CALL_MASK) << IPC_STATUS_CALL_SHIFT)
  19
  20 #define IPC_FLG_MSG_FROM_KERNEL 1 /* this message originated in the kernel on
  21                                      behalf of a process, this is a trusted
  22                                      message, never reply to the sender
  23                                  */
  24 #define IPC_STATUS_FLAGS_SHIFT  16
  25 #define IPC_STATUS_FLAGS(flgs)  ((flgs) << IPC_STATUS_FLAGS_SHIFT)
  26 #define IPC_STATUS_FLAGS_TEST(status, flgs)     \
  27                 (((status) >> IPC_STATUS_FLAGS_SHIFT) & (flgs))
  28 #endif /* IPC_CONST_H */