kern_fork.c File Reference

#include <sys/cdefs.h>
#include "opt_kdtrace.h"
#include "opt_ktrace.h"
#include "opt_kstack_pages.h"
#include "opt_procdesc.h"
#include <sys/param.h>
#include <sys/systm.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/mutex.h>
#include <sys/priv.h>
#include <sys/proc.h>
#include <sys/procdesc.h>
#include <sys/pioctl.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 ("$BSDSUniX$")
	SDT_PROVIDER_DECLARE (proc)
	SDT_PROBE_DEFINE3 (proc, kernel,, 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, 0, 0, sysctl_kern_randompid,"I","Random PID modulus")
static int	fork_findpid (int flags)
static int	fork_norfproc (struct thread *td, int flags)
static void	do_fork (struct thread *td, int flags, struct proc *p2, struct thread *td2, struct vmspace *vm2, int pdflags)
int	fork1 (struct thread *td, int flags, int pages, struct proc **procp, int *procdescp, int pdflags)
void	fork_exit (void(*callout)(void *, struct trapframe *), void *arg, struct trapframe *frame)
void	fork_return (struct thread *td, struct trapframe *frame)

Variables
int	nprocs = 1
int	lastpid = 0
static int	randompid = 0

Function Documentation

__FBSDID

(

"$BSDSUniX$"

)

static void do_fork ( struct thread *  td, int  flags, struct proc *  p2, struct thread *  td2, struct vmspace *  vm2, int  pdflags  )

static

Definition at line 369 of file kern_fork.c.

References allproc, allproc_lock, crhold(), fd, fdcopy(), fdinit(), fdshare(), filedesc_to_leader_alloc(), fork_findpid(), initproc, kern_psignal(), knote_fork(), lim_fork(), microuptime(), nprocs, pargs_hold(), ppeers_lock, prison_proc_hold(), proc0, proctree_lock, pstats_fork(), sched_add(), sched_fork(), sigacts_alloc(), sigacts_copy(), sigacts_hold(), startprofclock(), ticks, tidhash_add(), and vref().

Referenced by fork1().

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int fork1	(	struct thread *	td,
		int	flags,
		int	pages,
		struct proc **	procp,
		int *	procdescp,
		int	pdflags
	)

Definition at line 759 of file kern_fork.c.

References allproc_lock, chgproccnt(), do_fork(), falloc(), fork_norfproc(), hz, knlist_init_mtx(), lim_cur(), maxproc, nprocs, pause(), ppsratecheck(), printf(), priv_check_cred(), proc_linkup(), proc_zone, proctree_lock, racct_proc_exit(), racct_proc_fork(), racct_proc_fork_done(), 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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void fork_exit	(	void(*)(void *, struct trapframe *)	callout,
		void *	arg,
		struct trapframe *	frame
	)

Definition at line 968 of file kern_fork.c.

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

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static int fork_findpid ( int  flags )

static

Definition at line 227 of file kern_fork.c.

References allproc, allproc_lock, lastpid, pid_max, proctree_lock, randompid, and zombproc.

Referenced by do_fork().

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

static

Definition at line 319 of file kern_fork.c.

References fdfree(), fdinit(), fdunshare(), thread_single(), and thread_single_end().

Referenced by fork1().

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

Definition at line 1024 of file kern_fork.c.

References Giant, proc_reparent(), proctree_lock, ptracestop(), and userret().

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

SDT_PROVIDER_DECLARE

(

proc

)

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

Definition at line 119 of file kern_fork.c.

References fd, and fork1().

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

Definition at line 147 of file kern_fork.c.

References fork1().

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

static int sysctl_kern_randompid ( SYSCTL_HANDLER_ARGS  )

static

Definition at line 200 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	(	_kern	,
		OID_AUTO	,
		randompid	,
		CTLTYPE_INT|	CTLFLAG_RW,
		0	,
		0	,
		sysctl_kern_randompid	,
		"I"	,
		"Random PID modulus"
	)

Variable Documentation

int lastpid = 0

Definition at line 185 of file kern_fork.c.

Referenced by fork_findpid().

int nprocs = 1

Definition at line 184 of file kern_fork.c.

Referenced by do_fork(), fork1(), and proc_reap().

int randompid = 0

static

Definition at line 197 of file kern_fork.c.

Referenced by fork_findpid(), and sysctl_kern_randompid().