sys/kern/kern_fork.c

368 do_fork(struct thread *td, struct fork_req *fr, struct proc *p2, struct thread *td2,
380 	bcopy(&p1->p_startcopy, &p2->p_startcopy,
382 	pargs_hold(p2->p_args);
385 	bzero(&p2->p_startzero,
389 	prison_proc_hold(p2->p_ucred->cr_prison);
391 	p2->p_state = PRS_NEW;		/* protect against others */
392 	p2->p_pid = fork_findpid(fr->fr_flags);
393 	AUDIT_ARG_PID(p2->p_pid);
396 	LIST_INSERT_HEAD(&allproc, p2, p_list);
400 	sx_xlock(PIDHASHLOCK(p2->p_pid));
401 	LIST_INSERT_HEAD(PIDHASH(p2->p_pid), p2, p_hash);
402 	sx_xunlock(PIDHASHLOCK(p2->p_pid));
452 			    p1->p_fd, p2);
461 	PROC_LOCK(p2);
470 	bcopy(&p2->p_comm, &td2->td_name, sizeof(td2->td_name));
491 	p2->p_flag = P_INMEM;
492 	p2->p_flag2 = p1->p_flag2 & (P2_ASLR_DISABLE | P2_ASLR_ENABLE |
496 	p2->p_swtick = ticks;
498 		startprofclock(p2);
501 		p2->p_sigacts = sigacts_hold(p1->p_sigacts);
504 		p2->p_sigacts = newsigacts;
506 			mtx_lock(&p2->p_sigacts->ps_mtx);
508 				sig_drop_caught(p2);
510 				p2->p_sigacts->ps_flag |= PS_NOCLDWAIT;
511 			mtx_unlock(&p2->p_sigacts->ps_mtx);
516 	        p2->p_sigparent = RFTSIGNUM(fr->fr_flags);
518 	        p2->p_sigparent = SIGUSR1;
520 	        p2->p_sigparent = SIGCHLD;
523 		p2->p_flag |= P_SYSTEM | P_KPROC;
527 	p2->p_textvp = p1->p_textvp;
528 	p2->p_fd = fd;
529 	p2->p_fdtol = fdtol;
530 	p2->p_pd = pd;
533 		p2->p_flag |= P_PROTECTED;
534 		p2->p_flag2 |= P2_INHERIT_PROTECTED;
540 	lim_fork(p1, p2);
542 	thread_cow_get_proc(td2, p2);
544 	pstats_fork(p1->p_stats, p2->p_stats);
547 	PROC_UNLOCK(p2);
550 	if (p2->p_textvp)
551 		vrefact(p2->p_textvp);
558 		p2->p_peers = p1->p_peers;
559 		p1->p_peers = p2;
560 		p2->p_leader = p1->p_leader;
572 			 * to go ahead and kill the new process p2 since
578 			PROC_LOCK(p2);
579 			kern_psignal(p2, SIGKILL);
580 			PROC_UNLOCK(p2);
584 		p2->p_peers = NULL;
585 		p2->p_leader = p2;
590 	PROC_LOCK(p2);
597 	p2->p_flag |= p1->p_flag & P_SUGID;
602 		p2->p_flag |= P_CONTROLT;
605 		p2->p_flag |= P_PPWAIT;
607 	p2->p_pgrp = p1->p_pgrp;
608 	LIST_INSERT_AFTER(p1, p2, p_pglist);
610 	LIST_INIT(&p2->p_children);
611 	LIST_INIT(&p2->p_orphans);
613 	callout_init_mtx(&p2->p_itcallout, &p2->p_mtx, 0);
614 	TAILQ_INIT(&p2->p_kqtim_stop);
632 		p2->p_reaper = pptr;
634 		p2->p_reaper = (p1->p_treeflag & P_TREE_REAPER) != 0 ?
638 	p2->p_pptr = pptr;
639 	p2->p_oppid = pptr->p_pid;
640 	LIST_INSERT_HEAD(&pptr->p_children, p2, p_sibling);
641 	LIST_INIT(&p2->p_reaplist);
642 	LIST_INSERT_HEAD(&p2->p_reaper->p_reaplist, p2, p_reapsibling);
643 	if (p2->p_reaper == p1 && p1 != initproc) {
644 		p2->p_reapsubtree = p2->p_pid;
645 		proc_id_set_cond(PROC_ID_REAP, p2->p_pid);
650 	p2->p_acflag = AFORK;
651 	PROC_UNLOCK(p2);
654 	ktrprocfork(p1, p2);
661 	vm_forkproc(td, p2, td2, vm2, fr->fr_flags);
665 		VM_CNT_ADD(v_forkpages, p2->p_vmspace->vm_dsize +
666 		    p2->p_vmspace->vm_ssize);
669 		VM_CNT_ADD(v_vforkpages, p2->p_vmspace->vm_dsize +
670 		    p2->p_vmspace->vm_ssize);
673 		VM_CNT_ADD(v_kthreadpages, p2->p_vmspace->vm_dsize +
674 		    p2->p_vmspace->vm_ssize);
677 		VM_CNT_ADD(v_rforkpages, p2->p_vmspace->vm_dsize +
678 		    p2->p_vmspace->vm_ssize);
687 		procdesc_new(p2, fr->fr_pd_flags);
693 	EVENTHANDLER_DIRECT_INVOKE(process_fork, p1, p2, fr->fr_flags);
698 	PROC_LOCK(p2);
700 	microuptime(&p2->p_stats->p_start);
701 	PROC_SLOCK(p2);
702 	p2->p_state = PRS_NORMAL;
703 	PROC_SUNLOCK(p2);
713 		dtrace_fasttrap_fork(p1, p2);
717 		td->td_rfppwait_p = p2;
720 	PROC_UNLOCK(p2);
725 	knote_fork(p1->p_klist, p2->p_pid);
732 	SDT_PROBE3(proc, , , create, p2, p1, fr->fr_flags);
735 		procdesc_finit(p2->p_procdesc, fp_procdesc);
746 		PROC_LOCK(p2);
762 			td->td_dbg_forked = p2->p_pid;
764 			proc_set_traced(p2, true);
767 			    p2->p_pid, p2->p_oppid);
768 			proc_reparent(p2, p1->p_pptr, false);
770 		PROC_UNLOCK(p2);
774 	racct_proc_fork_done(p2);
778 			*fr->fr_pidp = p2->p_pid;
787 		*fr->fr_procp = p2;
794 	struct proc *p, *p2;
810 	p2 = td->td_rfppwait_p;
812 	PROC_LOCK(p2);
813 	while (p2->p_flag & P_PPWAIT) {
816 			PROC_UNLOCK(p2);
823 		cv_timedwait(&p2->p_pwait, &p2->p_mtx, hz);
825 	PROC_UNLOCK(p2);