kern_fork.c File Reference

#include <sys/cdefs.h>
#include "opt_ktrace.h"
#include "opt_kstack_pages.h"
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/bitstring.h>
#include <sys/sysproto.h>
#include <sys/eventhandler.h>
#include <sys/fcntl.h>
#include <sys/filedesc.h>
#include <sys/jail.h>
#include <sys/kernel.h>
#include <sys/kthread.h>
#include <sys/sysctl.h>
#include <sys/lock.h>
#include <sys/malloc.h>
#include <sys/msan.h>
#include <sys/mutex.h>
#include <sys/priv.h>
#include <sys/proc.h>
#include <sys/procdesc.h>
#include <sys/ptrace.h>
#include <sys/racct.h>
#include <sys/resourcevar.h>
#include <sys/sched.h>
#include <sys/syscall.h>
#include <sys/vmmeter.h>
#include <sys/vnode.h>
#include <sys/acct.h>
#include <sys/ktr.h>
#include <sys/ktrace.h>
#include <sys/unistd.h>
#include <sys/sdt.h>
#include <sys/sx.h>
#include <sys/sysent.h>
#include <sys/signalvar.h>
#include <security/audit/audit.h>
#include <security/mac/mac_framework.h>
#include <vm/vm.h>
#include <vm/pmap.h>
#include <vm/vm_map.h>
#include <vm/vm_extern.h>
#include <vm/uma.h>

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Data Structures
struct	fork_args

Functions
	__FBSDID ("$FreeBSD$")
	SDT_PROVIDER_DECLARE (proc)
	SDT_PROBE_DEFINE3 (proc,,, create, "struct proc *", "struct proc *", "int")
int	sys_fork (struct thread *td, struct fork_args *uap)
int	sys_pdfork (struct thread *td, struct pdfork_args *uap)
int	sys_vfork (struct thread *td, struct vfork_args *uap)
int	sys_rfork (struct thread *td, struct rfork_args *uap)
	SYSCTL_INT (_kern, OID_AUTO, lastpid, CTLFLAG_RD, &lastpid, 0, "Last used PID")
static int	sysctl_kern_randompid (SYSCTL_HANDLER_ARGS)
	SYSCTL_PROC (_kern, OID_AUTO, randompid, CTLTYPE_INT|CTLFLAG_RW|CTLFLAG_MPSAFE, 0, 0, sysctl_kern_randompid, "I", "Random PID modulus. Special values: 0: disable, 1: choose random value")
static int	fork_findpid (int flags)
static int	fork_norfproc (struct thread *td, int flags)
static void	do_fork (struct thread *td, struct fork_req *fr, struct proc *p2, struct thread *td2, struct vmspace *vm2, struct file *fp_procdesc)
void	fork_rfppwait (struct thread *td)
int	fork1 (struct thread *td, struct fork_req *fr)
void	fork_exit (void(*callout)(void *, struct trapframe *), void *arg, struct trapframe *frame)
void	fork_return (struct thread *td, struct trapframe *frame)

Variables
int __exclusive_cache_line	nprocs = 1
int	lastpid = 0
static int	randompid = 0
bitstr_t	proc_id_pidmap
bitstr_t	proc_id_grpidmap
bitstr_t	proc_id_sessidmap
bitstr_t	proc_id_reapmap

Function Documentation

__FBSDID()

__FBSDID

(

"$FreeBSD$"

)

do_fork()

static void do_fork ( struct thread *  td, struct fork_req *  fr, struct proc *  p2, struct thread *  td2, struct vmspace *  vm2, struct file *  fp_procdesc  )

static

Definition at line 369 of file kern_fork.c.

References allproc, allproc_gen, allproc_lock, fd, fdcopy(), fdinit(), fdshare(), filedesc_to_leader_alloc(), fork_findpid(), initproc, kern_psignal(), knote_fork(), lim_fork(), microuptime(), pargs_hold(), pdcopy(), pdinit(), pdshare(), ppeers_lock, prison_proc_hold(), proc0, proc_id_set_cond(), proc_reparent(), proc_set_traced(), procdesc_finit(), procdesc_new(), proctree_lock, pstats_fork(), sched_add(), sched_fork(), sig_drop_caught(), sigacts_alloc(), sigacts_copy(), sigacts_hold(), startprofclock(), thread_cow_get_proc(), ticks, tidhash_add(), and vrefact().

Referenced by fork1().

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fork1()

int fork1	(	struct thread *	td,
		struct fork_req *	fr
	)

Definition at line 853 of file kern_fork.c.

References allproc_lock, chgproccnt(), do_fork(), fdclose(), flags, fork_norfproc(), hz, kmsan_thread_alloc(), knlist_alloc(), kstack_pages, lim_cur(), maxproc, nprocs, ppsratecheck(), printf(), priv_check_cred(), proc_linkup(), proc_set_cred_init(), proc_unset_cred(), proc_zone, procdesc_falloc(), thread_alloc(), and thread_alloc_stack().

Referenced by create_init(), kproc_create(), sys_fork(), sys_pdfork(), sys_rfork(), and sys_vfork().

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fork_exit()

void fork_exit	(	void(*)(void *, struct trapframe *)	callout,
		void *	arg,
		struct trapframe *	frame
	)

Definition at line 1068 of file kern_fork.c.

References Giant, kmsan_mark(), kthread_exit(), printf(), sched_fork_exit(), and thread_stash().

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fork_findpid()

static int fork_findpid ( int  flags )

static

Definition at line 257 of file kern_fork.c.

References flags, lastpid, pid_max, proc_id_grpidmap, proc_id_pidmap, proc_id_reapmap, proc_id_sessidmap, procid_lock, randompid, and result.

Referenced by do_fork().

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fork_norfproc()

static int fork_norfproc ( struct thread *  td, int  flags  )

static

Definition at line 308 of file kern_fork.c.

References fdescfree(), fdinit(), fdunshare(), flags, pdescfree(), pdinit(), pdunshare(), thread_single(), and thread_single_end().

Referenced by fork1().

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fork_return()

void fork_return	(	struct thread *	td,
		struct trapframe *	frame
	)

Definition at line 1126 of file kern_fork.c.

References exit1(), prison_isalive(), ptracestop(), and userret().

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fork_rfppwait()

void fork_rfppwait

(

struct thread *

td

)

Definition at line 808 of file kern_fork.c.

References hz, ptracestop(), thread_suspend_check(), and thread_suspend_check_needed().

Referenced by ast().

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SDT_PROBE_DEFINE3()

SDT_PROBE_DEFINE3	(	proc	,
		create	,
		"struct proc *"	,
		"struct proc *"	,
		"int"
	)

SDT_PROVIDER_DECLARE()

SDT_PROVIDER_DECLARE

(

proc

)

sys_fork()

int sys_fork	(	struct thread *	td,
		struct fork_args *	uap
	)

Definition at line 104 of file kern_fork.c.

References fork1().

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sys_pdfork()

int sys_pdfork	(	struct thread *	td,
		struct pdfork_args *	uap
	)

Definition at line 122 of file kern_fork.c.

References fd, and fork1().

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sys_rfork()

int sys_rfork	(	struct thread *	td,
		struct rfork_args *	uap
	)

Definition at line 166 of file kern_fork.c.

References fork1().

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sys_vfork()

int sys_vfork	(	struct thread *	td,
		struct vfork_args *	uap
	)

Definition at line 149 of file kern_fork.c.

References fork1().

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SYSCTL_INT()

SYSCTL_INT	(	_kern	,
		OID_AUTO	,
		lastpid	,
		CTLFLAG_RD	,
		&	lastpid,
		0	,
		"Last used PID"
	)

sysctl_kern_randompid()

static int sysctl_kern_randompid ( SYSCTL_HANDLER_ARGS  )

static

Definition at line 211 of file kern_fork.c.

References allproc_lock, pid_max, randompid, sysctl_handle_int(), and sysctl_wire_old_buffer().

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SYSCTL_PROC()

SYSCTL_PROC	(	_kern	,
		OID_AUTO	,
		randompid	,
		CTLTYPE_INT|CTLFLAG_RW|	CTLFLAG_MPSAFE,
		0	,
		0	,
		sysctl_kern_randompid	,
		"I"	,
		"Random PID modulus. Special values: 0:	disable,
		1:choose random value"
	)

Variable Documentation

lastpid

int lastpid = 0

Definition at line 196 of file kern_fork.c.

Referenced by fork_findpid().

nprocs

int __exclusive_cache_line nprocs = 1

Definition at line 195 of file kern_fork.c.

Referenced by fork1(), and proc_reap().

proc_id_grpidmap

bitstr_t proc_id_grpidmap

extern

Referenced by fork_findpid().

proc_id_pidmap

bitstr_t proc_id_pidmap

extern

Referenced by fork_findpid().

proc_id_reapmap

bitstr_t proc_id_reapmap

extern

Referenced by fork_findpid().

proc_id_sessidmap

bitstr_t proc_id_sessidmap

extern

Referenced by fork_findpid().

randompid

int randompid = 0

static

Definition at line 208 of file kern_fork.c.

Referenced by fork_findpid(), and sysctl_kern_randompid().