minix3/servers/vm/queryexit.c

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2020-02-21 00:59:27 +05:30
#define _SYSTEM 1
#include <minix/callnr.h>
#include <minix/com.h>
#include <minix/config.h>
#include <minix/const.h>
#include <minix/ds.h>
#include <minix/endpoint.h>
#include <minix/minlib.h>
#include <minix/type.h>
#include <minix/ipc.h>
#include <minix/sysutil.h>
#include <minix/syslib.h>
#include <minix/safecopies.h>
#include <minix/bitmap.h>
#include <minix/vm.h>
#include <minix/ds.h>
#include <errno.h>
#include <string.h>
#include <env.h>
#include <stdio.h>
#include "glo.h"
#include "proto.h"
#include "util.h"
struct query_exit_struct {
int avail;
endpoint_t ep;
};
static struct query_exit_struct array[NR_PROCS];
/*===========================================================================*
* do_query_exit *
*===========================================================================*/
int do_query_exit(message *m)
{
int i, nr;
endpoint_t ep = NONE;
for (i = 0; i < NR_PROCS; i++) {
if (!array[i].avail) {
array[i].avail = 1;
ep = array[i].ep;
array[i].ep = 0;
break;
}
}
nr = 0;
for (i = 0; i < NR_PROCS; i++) {
if (!array[i].avail)
nr++;
}
m->m_lsys_vm_query_exit.ret_pt = ep;
m->m_lsys_vm_query_exit.is_more = (nr > 0);
return OK;
}
/*===========================================================================*
* do_notify_sig *
*===========================================================================*/
int do_notify_sig(message *m)
{
int i, avails = 0;
endpoint_t ep = m->VM_NOTIFY_SIG_ENDPOINT;
endpoint_t ipc_ep = m->VM_NOTIFY_SIG_IPC;
int r;
struct vmproc *vmp;
int pslot;
if(vm_isokendpt(ep, &pslot) != OK) return ESRCH;
vmp = &vmproc[pslot];
/* Only record the event if we've been asked to report it. */
if(!(vmp->vm_flags & VMF_WATCHEXIT))
return OK;
for (i = 0; i < NR_PROCS; i++) {
/* its signal is already here */
if (!array[i].avail && array[i].ep == ep)
goto out;
if (array[i].avail)
avails++;
}
if (!avails) {
/* no slot for signals, unlikely */
printf("VM: no slot for signals!\n");
return ENOMEM;
}
for (i = 0; i < NR_PROCS; i++) {
if (array[i].avail) {
array[i].avail = 0;
array[i].ep = ep;
break;
}
}
out:
/* only care when IPC server starts up,
* and bypass the process to be signal is IPC itself.
*/
if (ipc_ep != 0 && ep != ipc_ep) {
r = ipc_notify(ipc_ep);
if (r != OK)
printf("VM: ipc_notify error!\n");
}
return OK;
}
/*===========================================================================*
* do_watch_exit *
*===========================================================================*/
int do_watch_exit(message *m)
{
endpoint_t e = m->m_lsys_vm_watch_exit.ep;
struct vmproc *vmp;
int p;
if(vm_isokendpt(e, &p) != OK) return ESRCH;
vmp = &vmproc[p];
vmp->vm_flags |= VMF_WATCHEXIT;
return OK;
}
/*===========================================================================*
* init_query_exit *
*===========================================================================*/
void init_query_exit(void)
{
int i;
for (i = 0; i < NR_PROCS; i++) {
array[i].avail = 1;
array[i].ep = 0;
}
}