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In posix, test0 makes inter-space ipc for testing extended ipc. This correctly fails when only the cap to ipc to pager is given to all tasks in the container. In order to overcome this problem, the tasks who fork for doing ipc to each other make a request to the pager to get capabilities to do so. Pager finds its own widened ipc capability over the container, replicates it, validates and reduces it to desired boundaries (i.e. just ipc betw. two spaces) and grants it as IMMUTABLE to requesting tasks. This protocol may be useful in implementing a client/server capability request relationship. Code builds but untested.
70 lines
2.2 KiB
C
70 lines
2.2 KiB
C
/*
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* Copyright (C) 2007, 2008 Bahadir Balban
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*
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* This file contains ipc definitions that are needed for server tasks
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* to communicate with each other. For example common shared memory ids
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* between two servers, or common ipc tags used between two servers are
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* defined here.
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*/
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#ifndef __IPCDEFS_H__
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#define __IPCDEFS_H__
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#include <l4/api/ipc.h>
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/* SHMID used betweeen FS0 and BLKDEV0 servers */
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#define FS_BLKDEV_SHMID 0
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/*** IPC Tags used between server tasks ***/
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/* For ping ponging */
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#define L4_IPC_TAG_SYNC_EXTENDED 1
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#define L4_IPC_TAG_SYNC_FULL 2
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#define L4_IPC_TAG_SYNC 3
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/* To obtain default shared page address */
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#define L4_IPC_TAG_SHPAGE 4
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/* XXX: unused */
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#define L4_IPC_TAG_GRANT 5
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/* Posix system call tags */
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#define L4_IPC_TAG_SHMGET 6
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#define L4_IPC_TAG_SHMAT 7
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#define L4_IPC_TAG_SHMDT 8
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#define L4_IPC_TAG_MMAP 9
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#define L4_IPC_TAG_MUNMAP 10
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#define L4_IPC_TAG_MSYNC 11
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#define L4_IPC_TAG_OPEN 12
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#define L4_IPC_TAG_READ 13
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#define L4_IPC_TAG_WRITE 14
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#define L4_IPC_TAG_LSEEK 15
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#define L4_IPC_TAG_CLOSE 16
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#define L4_IPC_TAG_BRK 17
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#define L4_IPC_TAG_READDIR 18
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#define L4_IPC_TAG_MKDIR 19
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#define L4_IPC_TAG_EXECVE 20
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#define L4_IPC_TAG_CHDIR 21
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#define L4_IPC_TAG_FORK 22
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#define L4_IPC_TAG_STAT 23
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#define L4_IPC_TAG_FSTAT 24
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#define L4_IPC_TAG_FSYNC 25
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#define L4_IPC_TAG_CLONE 26
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#define L4_IPC_TAG_EXIT 27
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#define L4_IPC_TAG_WAIT 28
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/* Tags for ipc between fs0 and mm0 */
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#define L4_IPC_TAG_TASKDATA 40
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#define L4_IPC_TAG_PAGER_OPEN 41 /* vfs sends the pager open file data. */
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#define L4_IPC_TAG_PAGER_READ 42 /* Pager reads file contents from vfs */
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#define L4_IPC_TAG_PAGER_WRITE 43 /* Pager writes file contents to vfs */
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#define L4_IPC_TAG_PAGER_CLOSE 44 /* Pager notifies vfs of file close */
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#define L4_IPC_TAG_PAGER_UPDATE_STATS 45 /* Pager updates file stats in vfs */
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#define L4_IPC_TAG_NOTIFY_FORK 46 /* Pager notifies vfs of process fork */
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#define L4_IPC_TAG_NOTIFY_EXIT 47 /* Pager notifies vfs of process exit */
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#define L4_IPC_TAG_PAGER_OPEN_BYPATH 48 /* Pager opens a vfs file by pathname */
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#define L4_REQUEST_CAPABILITY 50 /* Request a capability from pager */
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extern l4id_t pagerid;
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#endif /* __IPCDEFS_H__ */
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