49 lines
2.1 KiB
C
49 lines
2.1 KiB
C
#ifndef IPC_H
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#define IPC_H
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#include <minix/com.h>
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/* Masks and flags for system calls. */
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#define SYSCALL_FUNC 0x0F /* mask for system call function */
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#define SYSCALL_FLAGS 0xF0 /* mask for system call flags */
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#define NON_BLOCKING 0x10 /* prevent blocking, return error */
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/* System call numbers that are passed when trapping to the kernel. The
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* numbers are carefully defined so that it can easily be seen (based on
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* the bits that are on) which checks should be done in sys_call().
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*/
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#define SEND 1 /* 0 0 0 1 : blocking send */
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#define RECEIVE 2 /* 0 0 1 0 : blocking receive */
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#define SENDREC 3 /* 0 0 1 1 : SEND + RECEIVE */
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#define NOTIFY 4 /* 0 1 0 0 : nonblocking notify */
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#define ECHO 8 /* 1 0 0 0 : echo a message */
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/* The following bit masks determine what checks that should be done. */
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#define CHECK_PTR 0x0B /* 1 0 1 1 : validate message buffer */
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#define CHECK_DST 0x05 /* 0 1 0 1 : validate message destination */
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#define CHECK_SRC 0x02 /* 0 0 1 0 : validate message source */
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/* Send masks determine to whom processes can send messages or notifications.
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* The values here are used for the processes in the boot image. We rely on
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* the initialization code in main() to match the s_nr_to_id() mapping for the
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* processes in the boot image, so that the send mask that is defined here
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* can be directly copied onto map[0] of the actual send mask. Privilege
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* structure 0 is shared by user processes.
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*
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* Note that process numbers in the boot image should not be higher than
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* "BITCHUNK_BITS - NR_TASKS", because a bitchunk_t field is used to store
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* the send masks in the table that describes that processes in the image.
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*/
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#define s_nr_to_id(n) (NR_TASKS + (n) + 1)
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#define s(n) (1 << s_nr_to_id(n))
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#define SERV_M (~0)
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#define SYST_M (~0)
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#define USER_M (s(PM_PROC_NR)|s(FS_PROC_NR)|s(SM_PROC_NR))
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#define DRIV_M (USER_M | s(SYSTEM)|s(CLOCK)|s(LOG_PROC_NR)|s(TTY))
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/* Sanity check to make sure the send masks can be set. */
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extern int dummy[(BITCHUNK_BITS-NR_TASKS > INIT_PROC_NR) ? 1 : -1];
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#endif /* IPC_H */
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