Imbus/xv6-riscv-kernel
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move fork into proc.c

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rsc 2009-05-31 00:38:51 +00:00
parent dae9b0d48a
commit 215738336a
3 changed files with 24 additions and 27 deletions
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32
proc.c
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@ -130,34 +130,40 @@ usegment(void)
// Create a new process copying p as the parent.
// Sets up stack to return as if from system call.
// Caller must set state of returned proc to RUNNABLE.
struct proc*
copyproc(struct proc *p)
int
fork(void)
{
int i;
int i, pid;
struct proc *np;
// Allocate process.
if((np = allocproc()) == 0)
return 0;
return -1;
// Copy process state from p.
np->sz = p->sz;
np->sz = cp->sz;
if((np->mem = kalloc(np->sz)) == 0){
kfree(np->kstack, KSTACKSIZE);
np->kstack = 0;
np->state = UNUSED;
return 0;
return -1;
}
memmove(np->mem, p->mem, np->sz);
np->parent = p;
*np->tf = *p->tf;
memmove(np->mem, cp->mem, np->sz);
np->parent = cp;
*np->tf = *cp->tf;
// Clear %eax so that fork returns 0 in the child.
np->tf->eax = 0;
for(i = 0; i < NOFILE; i++)
if(p->ofile[i])
np->ofile[i] = filedup(p->ofile[i]);
np->cwd = idup(p->cwd);
if(cp->ofile[i])
np->ofile[i] = filedup(cp->ofile[i]);
np->cwd = idup(cp->cwd);
pid = np->pid;
np->state = RUNNABLE;
return np;
return pid;
}
// Set up first user process.