sys/sys/proc.h

   1 /*-
   2  * Copyright (c) 1986, 1989, 1991, 1993
   3  *      The Regents of the University of California.  All rights reserved.
   4  * (c) UNIX System Laboratories, Inc.
   5  * All or some portions of this file are derived from material licensed
   6  * to the University of California by American Telephone and Telegraph
   7  * Co. or Unix System Laboratories, Inc. and are reproduced herein with
   8  * the permission of UNIX System Laboratories, Inc.
   9  *
  10  * Redistribution and use in source and binary forms, with or without
  11  * modification, are permitted provided that the following conditions
  12  * are met:
  13  * 1. Redistributions of source code must retain the above copyright
  14  *    notice, this list of conditions and the following disclaimer.
  15  * 2. Redistributions in binary form must reproduce the above copyright
  16  *    notice, this list of conditions and the following disclaimer in the
  17  *    documentation and/or other materials provided with the distribution.
  18  * 3. All advertising materials mentioning features or use of this software
  19  *    must display the following acknowledgement:
  20  *      This product includes software developed by the University of
  21  *      California, Berkeley and its contributors.
  22  * 4. Neither the name of the University nor the names of its contributors
  23  *    may be used to endorse or promote products derived from this software
  24  *    without specific prior written permission.
  25  *
  26  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  27  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  28  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  29  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  30  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  31  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  32  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  33  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  34  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  35  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  36  * SUCH DAMAGE.
  37  *
  38  *      @(#)proc.h      8.15 (Berkeley) 5/19/95
  39  * $FreeBSD: src/sys/sys/proc.h,v 1.99.2.9 2003/06/06 20:21:32 tegge Exp $
  40  * $DragonFly: src/sys/sys/proc.h,v 1.114 2007/08/30 20:41:00 pavalos Exp $
  41  */
  42
  43 #ifndef _SYS_PROC_H_
  44 #define _SYS_PROC_H_
  45
  46 #if !defined(_KERNEL) && !defined(_KERNEL_STRUCTURES)
  47
  48 #error "Userland must include sys/user.h instead of sys/proc.h"
  49
  50 #else
  51
  52 #include <sys/callout.h>                /* For struct callout_handle. */
  53 #include <sys/filedesc.h>
  54 #include <sys/queue.h>
  55 #include <sys/tree.h>
  56 #include <sys/rtprio.h>                 /* For struct rtprio. */
  57 #include <sys/signal.h>
  58 #include <sys/lock.h>
  59 #ifndef _KERNEL
  60 #include <sys/time.h>                   /* For structs itimerval, timeval. */
  61 #endif
  62 #include <sys/ucred.h>
  63 #include <sys/event.h>                  /* For struct klist */
  64 #include <sys/thread.h>
  65 #include <sys/varsym.h>
  66 #include <sys/upcall.h>
  67 #include <sys/resourcevar.h>
  68 #ifdef _KERNEL
  69 #include <sys/globaldata.h>
  70 #endif
  71 #include <sys/systimer.h>
  72 #include <sys/usched.h>
  73 #include <machine/proc.h>               /* Machine-dependent proc substruct. */
  74 #include <sys/signalvar.h>
  75
  76 LIST_HEAD(proclist, proc);
  77 LIST_HEAD(lwplist, lwp);
  78
  79 struct lwp_rb_tree;
  80 RB_HEAD(lwp_rb_tree, lwp);
  81 RB_PROTOTYPE2(lwp_rb_tree, lwp, u.lwp_rbnode, rb_lwp_compare, lwpid_t);
  82
  83 /*
  84  * One structure allocated per session.
  85  */
  86 struct  session {
  87         int     s_count;                /* Ref cnt; pgrps in session. */
  88         struct  proc *s_leader;         /* Session leader. */
  89         struct  vnode *s_ttyvp;         /* Vnode of controlling terminal. */
  90         struct  tty *s_ttyp;            /* Controlling terminal. */
  91         pid_t   s_sid;                  /* Session ID */
  92         char    s_login[roundup(MAXLOGNAME, sizeof(long))];     /* Setlogin() name. */
  93 };
  94
  95 /*
  96  * One structure allocated per process group.
  97  */
  98 struct  pgrp {
  99         LIST_ENTRY(pgrp) pg_hash;       /* Hash chain. */
 100         struct proclist pg_members;     /* Pointer to pgrp members. */
 101         struct  session *pg_session;    /* Pointer to session. */
 102         struct  sigiolst pg_sigiolst;   /* List of sigio sources. */
 103         pid_t   pg_id;                  /* Pgrp id. */
 104         int     pg_jobc;        /* # procs qualifying pgrp for job control */
 105         struct lock pg_lock;            /* Lock during fork */
 106 };
 107
 108 #define PS_NOCLDWAIT    0x0001  /* No zombies if child dies */
 109 #define PS_NOCLDSTOP    0x0002  /* No SIGCHLD when children stop. */
 110
 111 /*
 112  * pargs, used to hold a copy of the command line, if it had a sane
 113  * length
 114  */
 115 struct  pargs {
 116         u_int   ar_ref;         /* Reference count */
 117         u_int   ar_length;      /* Length */
 118         u_char  ar_args[0];     /* Arguments */
 119 };
 120
 121 /*
 122  * Description of a process.
 123  *
 124  * This structure contains the information needed to manage a thread of
 125  * control, known in UN*X as a process; it has references to substructures
 126  * containing descriptions of things that the process uses, but may share
 127  * with related processes.  The process structure and the substructures
 128  * are always addressable except for those marked "(PROC ONLY)" below,
 129  * which might be addressable only on a processor on which the process
 130  * is running.
 131  *
 132  * NOTE!  The process start time is stored in the thread structure associated
 133  * with the process.  If the process is a Zombie, then this field will be
 134  * inaccessible due to the thread structure being free'd in kern_wait1().
 135  */
 136
 137 struct jail;
 138 struct vkernel_proc;
 139 struct vkernel_lwp;
 140 struct vmspace_entry;
 141 struct ktrace_node;
 142
 143 enum lwpstat {
 144         LSRUN = 1,
 145         LSSTOP = 2,
 146         LSSLEEP = 3,
 147 };
 148
 149 enum procstat {
 150         SIDL = 1,
 151         SACTIVE = 2,
 152         SSTOP = 3,
 153         SZOMB = 4,
 154 };
 155
 156 struct lwp {
 157         TAILQ_ENTRY(lwp) lwp_procq;     /* run/sleep queue. */
 158         union {
 159             RB_ENTRY(lwp)       lwp_rbnode;     /* RB tree node - lwp in proc */
 160             LIST_ENTRY(lwp)     lwp_reap_entry; /* reaper list */
 161         } u;
 162
 163         struct proc     *lwp_proc;      /* Link to our proc. */
 164         struct vmspace  *lwp_vmspace;   /* Inherited from p_vmspace */
 165         struct vkernel_lwp *lwp_vkernel;/* VKernel support, lwp part */
 166
 167         lwpid_t         lwp_tid;        /* Our thread id . */
 168
 169         int             lwp_flag;       /* LWP_* flags. */
 170         enum lwpstat    lwp_stat;       /* LS* lwp status. */
 171         int             lwp_lock;       /* lwp lock (prevent destruct) count */
 172
 173         int             lwp_dupfd;      /* Sideways return value from fdopen. XXX */
 174
 175         /*
 176          * The following two fields are marked XXX since (at least) the
 177          * 4.4BSD-Lite2 import.  I can only guess the reason:  It is ugly.
 178          * These fields are used to pass the trap code from trapsignal() to
 179          * postsig(), which gets called later from userret().
 180          *
 181          * The correct "fix" for these XXX is to convert our signal system
 182          * to use signal queues, where each signal can carry its own meta
 183          * data.
 184          */
 185         int             lwp_sig;        /* for core dump/debugger XXX */
 186         u_long          lwp_code;       /* for core dump/debugger XXX */
 187
 188         /*
 189          * Scheduling.
 190          */
 191         sysclock_t      lwp_cpticks;    /* cpu used in sched clock ticks */
 192         sysclock_t      lwp_cpbase;     /* Measurement base */
 193         fixpt_t         lwp_pctcpu;     /* %cpu for this process */
 194         u_int           lwp_slptime;    /* Time since last blocked. */
 195
 196         int             lwp_traceflag;  /* Kernel trace points. */
 197
 198         struct rusage   lwp_ru;         /* stats for this lwp */
 199
 200         union usched_data lwp_usdata;   /* User scheduler specific */
 201
 202 #define lwp_startcopy   lwp_cpumask
 203         cpumask_t       lwp_cpumask;
 204         sigset_t        lwp_siglist;    /* Signals arrived but not delivered. */
 205         sigset_t        lwp_oldsigmask; /* saved mask from before sigpause */
 206         sigset_t        lwp_sigmask;    /* Current signal mask. */
 207         stack_t         lwp_sigstk;     /* sp & on stack state variable */
 208
 209         struct rtprio   lwp_rtprio;     /* Realtime priority. */
 210 #define lwp_endcopy     lwp_md
 211
 212         struct mdproc   lwp_md;         /* Any machine-dependent fields. */
 213
 214         struct thread   *lwp_thread;    /* backpointer to proc's thread */
 215         struct upcall   *lwp_upcall;    /* REGISTERED USERLAND POINTER! */
 216 };
 217
 218 struct  proc {
 219         LIST_ENTRY(proc) p_list;        /* List of all processes. */
 220
 221         /* substructures: */
 222         struct ucred    *p_ucred;       /* Process owner's identity. */
 223         struct filedesc *p_fd;          /* Ptr to open files structure. */
 224         struct filedesc_to_leader *p_fdtol; /* Ptr to tracking node XXX lwp */
 225         struct plimit   *p_limit;       /* Process limits. */
 226         struct pstats   *p_stats;
 227         void            *p_pad0;
 228         struct sigacts  *p_sigacts;
 229 #define p_sigignore     p_sigacts->ps_sigignore
 230 #define p_sigcatch      p_sigacts->ps_sigcatch
 231 #define p_rlimit        p_limit->pl_rlimit
 232
 233         int             p_flag;         /* P_* flags. */
 234         enum procstat   p_stat;         /* S* process status. */
 235         char            p_pad1[3];
 236
 237         pid_t           p_pid;          /* Process identifier. */
 238         LIST_ENTRY(proc) p_hash;        /* Hash chain. */
 239         LIST_ENTRY(proc) p_pglist;      /* List of processes in pgrp. */
 240         struct proc     *p_pptr;        /* Pointer to parent process. */
 241         LIST_ENTRY(proc) p_sibling;     /* List of sibling processes. */
 242         struct proclist p_children;     /* Pointer to list of children. */
 243         struct callout  p_ithandle;     /* for scheduling p_realtimer */
 244         struct varsymset p_varsymset;
 245
 246         pid_t           p_oppid;        /* Save parent pid during ptrace. XXX */
 247
 248         struct vmspace  *p_vmspace;     /* Current address space. */
 249
 250         unsigned int    p_swtime;       /* Time swapped in or out */
 251
 252         struct itimerval p_realtimer;   /* Alarm timer. */
 253         struct itimerval p_timer[3];    /* Virtual-time timers. */
 254
 255         int             p_traceflag;    /* Kernel trace points. */
 256         struct ktrace_node *p_tracenode; /* Trace to vnode. */
 257
 258         sigset_t        p_siglist;      /* Signals arrived but not delivered. */
 259
 260         struct vnode    *p_textvp;      /* Vnode of executable. */
 261
 262         unsigned int    p_stops;        /* procfs event bitmask */
 263         unsigned int    p_stype;        /* procfs stop event type */
 264         char            p_step;         /* procfs stop *once* flag */
 265         unsigned char   p_pfsflags;     /* procfs flags */
 266         char            p_pad2[2];      /* padding for alignment */
 267         struct          sigiolst p_sigiolst;    /* list of sigio sources */
 268         int             p_sigparent;    /* signal to parent on exit */
 269         struct klist    p_klist;        /* knotes attached to this process */
 270
 271         struct timeval  p_start;        /* start time for a process */
 272
 273         struct rusage   p_ru;           /* stats for this proc */
 274         struct rusage   p_cru;          /* sum of stats for reaped children */
 275
 276 /* The following fields are all copied upon creation in fork. */
 277 #define p_startcopy     p_comm
 278
 279         char            p_comm[MAXCOMLEN+1]; /* typ 16+1 bytes */
 280         char            p_lock;         /* Process lock (prevent destruct) count. */
 281         char            p_nice;         /* Process "nice" value. */
 282         char            p_pad3;
 283
 284         struct pgrp     *p_pgrp;        /* Pointer to process group. */
 285
 286         struct sysentvec *p_sysent;     /* System call dispatch information. */
 287
 288         struct uprof    p_prof;         /* Profiling arguments. */
 289         struct rtprio   p_rtprio;       /* Realtime priority. */
 290         struct pargs    *p_args;
 291 /* End area that is copied on creation. */
 292 #define p_endcopy       p_xstat
 293
 294         u_short         p_xstat;        /* Exit status or last stop signal */
 295         u_short         p_acflag;       /* Accounting flags. */
 296
 297         int             p_nthreads;     /* Number of threads in this process. */
 298         int             p_nstopped;     /* Number of stopped threads. */
 299         int             p_lasttid;      /* Last tid used. */
 300         struct lwp_rb_tree p_lwp_tree;  /* RB tree of LWPs for this process */
 301         void            *p_aioinfo;     /* ASYNC I/O info */
 302         int             p_wakeup;       /* thread id XXX lwp */
 303         struct proc     *p_peers;       /* XXX lwp */
 304         struct proc     *p_leader;      /* XXX lwp */
 305         void            *p_emuldata;    /* process-specific emulator state */
 306         struct usched   *p_usched;      /* Userland scheduling control */
 307         struct vkernel_proc *p_vkernel; /* VKernel support, proc part */
 308         int             p_numposixlocks; /* number of POSIX locks */
 309
 310         struct spinlock p_spin;         /* Spinlock for LWP access to proc */
 311 };
 312
 313 #define lwp_wchan       lwp_thread->td_wchan
 314 #define lwp_wmesg       lwp_thread->td_wmesg
 315 #define p_session       p_pgrp->pg_session
 316 #define p_pgid          p_pgrp->pg_id
 317
 318 /* These flags are kept in p_flags. */
 319 #define P_ADVLOCK       0x00001 /* Process may hold a POSIX advisory lock. */
 320 #define P_CONTROLT      0x00002 /* Has a controlling terminal. */
 321 #define P_SWAPPEDOUT    0x00004 /* Swapped out of memory */
 322 #define P_UNUSED3       0x00008 /* was: Event pending, break tsleep on sigcont */
 323 #define P_PPWAIT        0x00010 /* Parent is waiting for child to exec/exit. */
 324 #define P_PROFIL        0x00020 /* Has started profiling. */
 325 #define P_UNUSED5       0x00040 /* was: Selecting; wakeup/waiting danger. */
 326 #define P_UNUSED4       0x00080 /* was: Sleep is interruptible. */
 327 #define P_SUGID         0x00100 /* Had set id privileges since last exec. */
 328 #define P_SYSTEM        0x00200 /* System proc: no sigs, stats or swapping. */
 329 #define P_UNUSED2       0x00400 /* was: SIGSTOP status */
 330 #define P_TRACED        0x00800 /* Debugged process being traced. */
 331 #define P_WAITED        0x01000 /* SIGSTOP status was returned by wait3/4 */
 332 #define P_WEXIT         0x02000 /* Working on exiting (master exit) */
 333 #define P_EXEC          0x04000 /* Process called exec. */
 334 #define P_CONTINUED     0x08000 /* Proc has continued from a stopped state. */
 335
 336 /* Should probably be changed into a hold count. */
 337 /* was  P_NOSWAP        0x08000 was: Do not swap upages; p->p_hold */
 338 #define P_MAILBOX       0x10000 /* Possible mailbox signal pending */
 339
 340 #define P_UPCALLPEND    0x20000 /* an upcall is pending */
 341
 342 #define P_SWAPWAIT      0x40000 /* Waiting for a swapin */
 343 #define P_UNUSED6       0x80000 /* was: Now in a zombied state */
 344
 345 /* Marked a kernel thread */
 346 #define P_UNUSED07      0x100000 /* was: on a user scheduling run queue */
 347 #define P_KTHREADP      0x200000 /* Process is really a kernel thread */
 348 #define P_IDLESWAP      0x400000 /* Swapout was due to idleswap, not load */
 349 #define P_DEADLKTREAT   0x800000 /* lock aquisition - deadlock treatment */
 350
 351 #define P_JAILED        0x1000000 /* Process is in jail */
 352 #define P_UNUSED0       0x2000000 /* need to restore mask before pause */
 353 #define P_UNUSED1       0x4000000 /* have alternate signal stack */
 354 #define P_INEXEC        0x8000000 /* Process is in execve(). */
 355 #define P_PASSIVE_ACQ   0x10000000 /* Passive acquire cpu (see kern_switch) */
 356 #define P_UPCALLWAIT    0x20000000 /* Wait for upcall or signal */
 357 #define P_XCPU          0x40000000 /* SIGXCPU */
 358
 359 #define LWP_ALTSTACK    0x0000001 /* have alternate signal stack */
 360 #define LWP_OLDMASK     0x0000002 /* need to restore mask before pause */
 361 #define LWP_BREAKTSLEEP 0x0000004 /* Event pending, break tsleep on sigcont */
 362 #define LWP_SINTR       0x0000008 /* Sleep is interruptible. */
 363 #define LWP_SELECT      0x0000010 /* Selecting; wakeup/waiting danger. */
 364 #define LWP_ONRUNQ      0x0000020 /* on a user scheduling run queue */
 365 #define LWP_WEXIT       0x0000040 /* working on exiting */
 366 #define LWP_WSTOP       0x0000080 /* working on stopping */
 367
 368 #define FIRST_LWP_IN_PROC(p)            RB_FIRST(lwp_rb_tree, &(p)->p_lwp_tree)
 369 #define FOREACH_LWP_IN_PROC(lp, p)      \
 370         RB_FOREACH(lp, lwp_rb_tree, &(p)->p_lwp_tree)
 371 #define ONLY_LWP_IN_PROC(p)             \
 372         (p->p_nthreads != 1 &&          \
 373         (panic("%s: proc %p (pid %d cmd %s) has more than one thread",  \
 374                __func__, p, p->p_pid, p->p_comm), 1),   \
 375         RB_ROOT(&p->p_lwp_tree))
 376
 377 /*
 378  * We use process IDs <= PID_MAX; PID_MAX + 1 must also fit in a pid_t,
 379  * as it is used to represent "no process group".
 380  */
 381 #define PID_MAX         99999
 382 #define NO_PID          100000
 383
 384 #define SESS_LEADER(p)  ((p)->p_session->s_leader == (p))
 385
 386 #ifdef _KERNEL
 387
 388 #ifdef MALLOC_DECLARE
 389 MALLOC_DECLARE(M_SESSION);
 390 MALLOC_DECLARE(M_SUBPROC);
 391 MALLOC_DECLARE(M_PARGS);
 392 #endif
 393
 394 /* flags for suser_xxx() */
 395 #define PRISON_ROOT     0x1
 396 #define NULL_CRED_OKAY  0x2
 397
 398 /* Handy macro to determine if p1 can mangle p2 */
 399
 400 #define PRISON_CHECK(cr1, cr2) \
 401         ((!(cr1)->cr_prison) || (cr1)->cr_prison == (cr2)->cr_prison)
 402
 403 /*
 404  * STOPEVENT
 405  */
 406 extern void stopevent(struct proc*, unsigned int, unsigned int);
 407 #define STOPEVENT(p,e,v)                        \
 408         do {                                    \
 409                 if ((p)->p_stops & (e)) {       \
 410                         stopevent(p,e,v);       \
 411                 }                               \
 412         } while (0)
 413
 414 /* hold process in memory, don't destruct , normally for ptrace/procfs work */
 415 #define PHOLD(p)        (++(p)->p_lock)
 416 #define PRELE(p)        (--(p)->p_lock)
 417
 418 /* hold lwp in memory, don't destruct , normally for ptrace/procfs work */
 419 #define LWPHOLD(lp)     (++(lp)->lwp_lock)
 420 #define LWPRELE(lp)     (--(lp)->lwp_lock)
 421
 422 #define PIDHASH(pid)    (&pidhashtbl[(pid) & pidhash])
 423 extern LIST_HEAD(pidhashhead, proc) *pidhashtbl;
 424 extern u_long pidhash;
 425
 426 #define PGRPHASH(pgid)  (&pgrphashtbl[(pgid) & pgrphash])
 427 extern LIST_HEAD(pgrphashhead, pgrp) *pgrphashtbl;
 428 extern u_long pgrphash;
 429
 430 #if 0
 431 #ifndef SET_CURPROC
 432 #define SET_CURPROC(p)  (curproc = (p))
 433 #endif
 434 #endif
 435
 436 extern struct proc proc0;               /* Process slot for swapper. */
 437 extern struct lwp lwp0;                 /* LWP slot for swapper. */
 438 extern struct thread thread0;           /* Thread slot for swapper. */
 439 extern int hogticks;                    /* Limit on kernel cpu hogs. */
 440 extern int nprocs, maxproc;             /* Current and max number of procs. */
 441 extern int maxprocperuid;               /* Max procs per uid. */
 442 extern int sched_quantum;               /* Scheduling quantum in ticks */
 443
 444 extern struct proclist allproc;         /* List of all processes. */
 445 extern struct proclist zombproc;        /* List of zombie processes. */
 446 extern struct proc *initproc;           /* Process slot for init */
 447 extern struct thread *pagethread, *updatethread;
 448
 449 /*
 450  * Scheduler independant variables.  The primary scheduler polling frequency,
 451  * the maximum ESTCPU value, and the weighting factor for nice values.  A
 452  * cpu bound program's estcpu will increase to ESTCPUMAX - 1.
 453  */
 454 #define ESTCPUFREQ      50
 455
 456 extern  u_long ps_arg_cache_limit;
 457 extern  int ps_argsopen;
 458 extern  int ps_showallprocs;
 459
 460 struct proc *pfind (pid_t);     /* Find process by id. */
 461 struct pgrp *pgfind (pid_t);    /* Find process group by id. */
 462 struct proc *zpfind (pid_t);    /* Find zombie process by id. */
 463
 464 struct vm_zone;
 465 struct globaldata;
 466 struct lwp_params;
 467 extern struct vm_zone *proc_zone;
 468 extern struct vm_zone *lwp_zone;
 469
 470 int     enterpgrp (struct proc *p, pid_t pgid, int mksess);
 471 void    proc_add_allproc(struct proc *p);
 472 void    proc_move_allproc_zombie(struct proc *);
 473 void    proc_remove_zombie(struct proc *);
 474 void    allproc_scan(int (*callback)(struct proc *, void *), void *data);
 475 void    alllwp_scan(int (*callback)(struct lwp *, void *), void *data);
 476 void    zombproc_scan(int (*callback)(struct proc *, void *), void *data);
 477 void    fixjobc (struct proc *p, struct pgrp *pgrp, int entering);
 478 void    updatepcpu(struct lwp *, int, int);
 479 int     inferior (struct proc *p);
 480 int     leavepgrp (struct proc *p);
 481 void    sess_hold(struct session *sp);
 482 void    sess_rele(struct session *sp);
 483 void    procinit (void);
 484 void    relscurproc(struct proc *curp);
 485 int     p_trespass (struct ucred *cr1, struct ucred *cr2);
 486 void    setrunnable (struct lwp *);
 487 void    proc_stop (struct proc *);
 488 void    proc_unstop (struct proc *);
 489 void    sleep_gdinit (struct globaldata *);
 490 int     suser (struct thread *td);
 491 int     suser_cred (struct ucred *cred, int flag);
 492 void    cpu_heavy_switch (struct thread *);
 493 void    cpu_lwkt_switch (struct thread *);
 494
 495 void    cpu_lwp_exit (void) __dead2;
 496 void    cpu_thread_exit (void) __dead2;
 497 void    lwp_exit (int masterexit) __dead2;
 498 void    lwp_dispose (struct lwp *);
 499 int     killalllwps (int);
 500 void    exit1 (int) __dead2;
 501 void    cpu_fork (struct lwp *, struct lwp *, int);
 502 int     cpu_prepare_lwp(struct lwp *, struct lwp_params *);
 503 void    cpu_set_fork_handler (struct lwp *, void (*)(void *, struct trapframe *), void *);
 504 void    cpu_set_thread_handler(struct thread *td, void (*retfunc)(void), void *func, void *arg);
 505 int     fork1 (struct lwp *, int, struct proc **);
 506 void    start_forked_proc (struct lwp *, struct proc *);
 507 int     trace_req (struct proc *);
 508 void    cpu_proc_wait (struct proc *);
 509 void    cpu_thread_wait (struct thread *);
 510 void    setsugid (void);
 511 void    faultin (struct proc *p);
 512 void    swapin_request (void);
 513
 514 u_int32_t       procrunnable (void);
 515
 516 #endif  /* _KERNEL */
 517
 518 #endif  /* _KERNEL || _KERNEL_STRUCTURES */
 519 #endif  /* !_SYS_PROC_H_ */