118 lines
2.7 KiB
C
118 lines
2.7 KiB
C
|
|
#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/debug.h>
|
|
#include <minix/bitmap.h>
|
|
|
|
#include <string.h>
|
|
#include <errno.h>
|
|
#include <env.h>
|
|
#include <assert.h>
|
|
|
|
#include "glo.h"
|
|
#include "vm.h"
|
|
#include "proto.h"
|
|
#include "util.h"
|
|
#include "sanitycheck.h"
|
|
#include "region.h"
|
|
|
|
/*===========================================================================*
|
|
* do_fork *
|
|
*===========================================================================*/
|
|
int do_fork(message *msg)
|
|
{
|
|
int r, proc, childproc;
|
|
struct vmproc *vmp, *vmc;
|
|
pt_t origpt;
|
|
vir_bytes msgaddr;
|
|
|
|
SANITYCHECK(SCL_FUNCTIONS);
|
|
|
|
if(vm_isokendpt(msg->VMF_ENDPOINT, &proc) != OK) {
|
|
printf("VM: bogus endpoint VM_FORK %d\n", msg->VMF_ENDPOINT);
|
|
SANITYCHECK(SCL_FUNCTIONS);
|
|
return EINVAL;
|
|
}
|
|
|
|
childproc = msg->VMF_SLOTNO;
|
|
if(childproc < 0 || childproc >= NR_PROCS) {
|
|
printf("VM: bogus slotno VM_FORK %d\n", msg->VMF_SLOTNO);
|
|
SANITYCHECK(SCL_FUNCTIONS);
|
|
return EINVAL;
|
|
}
|
|
|
|
vmp = &vmproc[proc]; /* parent */
|
|
vmc = &vmproc[childproc]; /* child */
|
|
assert(vmc->vm_slot == childproc);
|
|
|
|
/* The child is basically a copy of the parent. */
|
|
origpt = vmc->vm_pt;
|
|
*vmc = *vmp;
|
|
vmc->vm_slot = childproc;
|
|
region_init(&vmc->vm_regions_avl);
|
|
vmc->vm_endpoint = NONE; /* In case someone tries to use it. */
|
|
vmc->vm_pt = origpt;
|
|
|
|
#if VMSTATS
|
|
vmc->vm_bytecopies = 0;
|
|
#endif
|
|
|
|
if(pt_new(&vmc->vm_pt) != OK) {
|
|
return ENOMEM;
|
|
}
|
|
|
|
SANITYCHECK(SCL_DETAIL);
|
|
|
|
if(map_proc_copy(vmc, vmp) != OK) {
|
|
printf("VM: fork: map_proc_copy failed\n");
|
|
pt_free(&vmc->vm_pt);
|
|
return(ENOMEM);
|
|
}
|
|
|
|
/* Only inherit these flags. */
|
|
vmc->vm_flags &= VMF_INUSE;
|
|
|
|
/* Deal with ACLs. */
|
|
acl_fork(vmc);
|
|
|
|
/* Tell kernel about the (now successful) FORK. */
|
|
if((r=sys_fork(vmp->vm_endpoint, childproc,
|
|
&vmc->vm_endpoint, PFF_VMINHIBIT, &msgaddr)) != OK) {
|
|
panic("do_fork can't sys_fork: %d", r);
|
|
}
|
|
|
|
if((r=pt_bind(&vmc->vm_pt, vmc)) != OK)
|
|
panic("fork can't pt_bind: %d", r);
|
|
|
|
{
|
|
vir_bytes vir;
|
|
/* making these messages writable is an optimisation
|
|
* and its return value needn't be checked.
|
|
*/
|
|
vir = msgaddr;
|
|
if (handle_memory_once(vmc, vir, sizeof(message), 1) != OK)
|
|
panic("do_fork: handle_memory for child failed\n");
|
|
vir = msgaddr;
|
|
if (handle_memory_once(vmp, vir, sizeof(message), 1) != OK)
|
|
panic("do_fork: handle_memory for parent failed\n");
|
|
}
|
|
|
|
/* Inform caller of new child endpoint. */
|
|
msg->VMF_CHILD_ENDPOINT = vmc->vm_endpoint;
|
|
|
|
SANITYCHECK(SCL_FUNCTIONS);
|
|
return OK;
|
|
}
|
|
|