140 lines
3.8 KiB
C
140 lines
3.8 KiB
C
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#define _SYSTEM 1
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#define VERBOSE 0
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#include <minix/callnr.h>
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#include <minix/com.h>
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#include <minix/config.h>
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#include <minix/const.h>
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#include <minix/ds.h>
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#include <minix/endpoint.h>
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#include <minix/keymap.h>
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#include <minix/minlib.h>
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#include <minix/type.h>
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#include <minix/ipc.h>
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#include <minix/sysutil.h>
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#include <minix/syslib.h>
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#include <minix/safecopies.h>
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#include <errno.h>
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#include <string.h>
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#include <env.h>
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#include <stdio.h>
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#include "glo.h"
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#include "proto.h"
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#include "util.h"
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/*===========================================================================*
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* register_callback *
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*===========================================================================*/
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PRIVATE void register_callback(struct vmproc *for_who, callback_t callback,
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int callback_type)
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{
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if(for_who->vm_callback) {
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vm_panic("register_callback: callback already registered",
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for_who->vm_callback_type);
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}
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for_who->vm_callback = callback;
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for_who->vm_callback_type = callback_type;
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return;
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}
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/*===========================================================================*
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* vfs_open *
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*===========================================================================*/
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PUBLIC int vfs_open(struct vmproc *for_who, callback_t callback,
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cp_grant_id_t filename_gid, int filename_len, int flags, int mode)
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{
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static message m;
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int r;
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register_callback(for_who, callback, VM_VFS_REPLY_OPEN);
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m.m_type = VM_VFS_OPEN;
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m.VMVO_NAME_GRANT = filename_gid;
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m.VMVO_NAME_LENGTH = filename_len;
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m.VMVO_FLAGS = flags;
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m.VMVO_MODE = mode;
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m.VMVO_ENDPOINT = for_who->vm_endpoint;
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if((r=asynsend(VFS_PROC_NR, &m)) != OK) {
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vm_panic("vfs_open: asynsend failed", r);
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}
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return r;
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}
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/*===========================================================================*
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* vfs_close *
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*===========================================================================*/
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PUBLIC int vfs_close(struct vmproc *for_who, callback_t callback, int fd)
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{
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static message m;
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int r;
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register_callback(for_who, callback, VM_VFS_REPLY_CLOSE);
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m.m_type = VM_VFS_CLOSE;
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m.VMVC_ENDPOINT = for_who->vm_endpoint;
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m.VMVC_FD = fd;
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if((r=asynsend(VFS_PROC_NR, &m)) != OK) {
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vm_panic("vfs_close: asynsend failed", r);
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}
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return r;
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}
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/*===========================================================================*
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* do_vfs_reply *
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*===========================================================================*/
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PUBLIC int do_vfs_reply(message *m)
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{
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/* Reply to a request has been received from vfs. Handle it. First verify
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* and look up which process, identified by endpoint, this is about.
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* Then call the callback function that was registered when the request
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* was done. Return result to vfs.
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*/
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endpoint_t ep;
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struct vmproc *vmp;
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int procno;
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callback_t cb;
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ep = m->VMV_ENDPOINT;
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if(vm_isokendpt(ep, &procno) != OK) {
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printf("VM:do_vfs_reply: reply %d about invalid endpoint %d\n",
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m->m_type, ep);
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vm_panic("do_vfs_reply: invalid endpoint from vfs", NO_NUM);
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}
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vmp = &vmproc[procno];
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if(!vmp->vm_callback) {
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printf("VM:do_vfs_reply: reply %d: endpoint %d not waiting\n",
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m->m_type, ep);
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vm_panic("do_vfs_reply: invalid endpoint from vfs", NO_NUM);
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}
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if(vmp->vm_callback_type != m->m_type) {
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printf("VM:do_vfs_reply: reply %d unexpected for endpoint %d\n"
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" (expecting %d)\n", m->m_type, ep, vmp->vm_callback_type);
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vm_panic("do_vfs_reply: invalid reply from vfs", NO_NUM);
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}
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if(vmp->vm_flags & VMF_EXITING) {
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/* This is not fatal or impossible, but the callback
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* function has to realize it shouldn't do any PM or
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* VFS calls for this process.
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*/
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printf("VM:do_vfs_reply: reply %d for EXITING endpoint %d\n",
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m->m_type, ep);
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}
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/* All desired callback state has been used, so save and reset
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* the callback. This allows the callback to register another
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* one.
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*/
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cb = vmp->vm_callback;
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vmp->vm_callback = NULL;
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cb(vmp, m);
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return SUSPEND;
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}
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