include/minix/ipcconst.h

   1 #ifndef _IPC_CONST_H
   2 #define _IPC_CONST_H
   3
   4 #include <machine/ipcconst.h>
   5
   6  /* System call numbers that are passed when trapping to the kernel. */
   7 #define SEND               1    /* blocking send */
   8 #define RECEIVE            2    /* blocking receive */
   9 #define SENDREC            3    /* SEND + RECEIVE */
  10 #define NOTIFY             4    /* asynchronous notify */
  11 #define SENDNB             5    /* nonblocking send */
  12 #define MINIX_KERNINFO     6    /* request kernel info structure */
  13 #define SENDA              16   /* asynchronous send */
  14 #define IPCNO_HIGHEST   SENDA
  15 /* Check that the message payload type doesn't grow past the maximum IPC payload size.
  16  * This is a compile time check. */
  17 #define _ASSERT_MSG_SIZE(msg_type) \
  18     typedef int _ASSERT_##msg_type[/* CONSTCOND */sizeof(msg_type) == 56 ? 1 : -1]
  19
  20 /* Macros for IPC status code manipulation. */
  21 #define IPC_STATUS_CALL_SHIFT   0
  22 #define IPC_STATUS_CALL_MASK    0x3F
  23 #define IPC_STATUS_CALL(status) \
  24         (((status) >> IPC_STATUS_CALL_SHIFT) & IPC_STATUS_CALL_MASK)
  25 #define IPC_STATUS_CALL_TO(call) \
  26         (((call) & IPC_STATUS_CALL_MASK) << IPC_STATUS_CALL_SHIFT)
  27
  28 #define IPC_FLG_MSG_FROM_KERNEL 1 /* this message originated in the kernel on
  29                                      behalf of a process, this is a trusted
  30                                      message, never reply to the sender
  31                                  */
  32 #define IPC_STATUS_FLAGS_SHIFT  16
  33 #define IPC_STATUS_FLAGS(flgs)  ((flgs) << IPC_STATUS_FLAGS_SHIFT)
  34 #define IPC_STATUS_FLAGS_TEST(status, flgs)     \
  35                 (((status) >> IPC_STATUS_FLAGS_SHIFT) & (flgs))
  36 #endif /* IPC_CONST_H */