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. Neither the name of the University nor the names of its contributors
  19  *    may be used to endorse or promote products derived from this software
  20  *    without specific prior written permission.
  21  *
  22  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  23  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  25  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  27  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  28  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  32  * SUCH DAMAGE.
  33  */
  34 #ifndef _SYS_PROC_H_
  35 #define _SYS_PROC_H_
  36
  37 #if !defined(_KERNEL) && !defined(_KERNEL_STRUCTURES)
  38
  39 #error "Userland must include sys/user.h instead of sys/proc.h"
  40
  41 #else
  42
  43 #include <sys/callout.h>                /* For struct callout. */
  44 #include <sys/filedesc.h>
  45 #include <sys/queue.h>
  46 #include <sys/tree.h>
  47 #include <sys/rtprio.h>                 /* For struct rtprio. */
  48 #include <sys/signal.h>
  49 #include <sys/lock.h>
  50 #include <sys/upmap.h>
  51 #ifndef _KERNEL
  52 #include <sys/time.h>                   /* For structs itimerval, timeval. */
  53 #endif
  54 #include <sys/ucred.h>
  55 #include <sys/event.h>                  /* For struct klist */
  56 #include <sys/eventvar.h>
  57 #include <sys/sysent.h>                 /* For struct sysentvec */
  58 #include <sys/thread.h>
  59 #include <sys/varsym.h>
  60 #include <sys/resourcevar.h>
  61 #ifdef _KERNEL
  62 #include <sys/procctl.h>
  63 #include <sys/globaldata.h>
  64 #endif
  65 #include <sys/systimer.h>
  66 #include <sys/iosched.h>
  67 #include <sys/usched.h>
  68 #include <machine/proc.h>               /* Machine-dependent proc substruct. */
  69 #include <machine/atomic.h>             /* Machine-dependent proc substruct. */
  70 #include <sys/signalvar.h>
  71
  72 struct proc;
  73 struct pgrp;
  74 struct session;
  75 struct lwp;
  76
  77 LIST_HEAD(proclist, proc);
  78 LIST_HEAD(pgrplist, pgrp);
  79 LIST_HEAD(sesslist, session);
  80 LIST_HEAD(lwplist, lwp);
  81
  82 struct lwp_rb_tree;
  83 RB_HEAD(lwp_rb_tree, lwp);
  84 RB_PROTOTYPE2(lwp_rb_tree, lwp, u.lwp_rbnode, rb_lwp_compare, lwpid_t);
  85
  86 /*
  87  * One structure allocated per session.
  88  */
  89 struct  session {
  90         LIST_ENTRY(session) s_list;     /* Hash chain. */
  91         int     s_count;                /* Ref cnt; pgrps in session. */
  92         struct  proc *s_leader;         /* Session leader. */
  93         struct  vnode *s_ttyvp;         /* Vnode of controlling terminal. */
  94         struct  tty *s_ttyp;            /* Controlling terminal. */
  95         pid_t   s_sid;                  /* Session ID */
  96         char    s_login[roundup(MAXLOGNAME, sizeof(long))];     /* Setlogin() name. */
  97 };
  98
  99 /*
 100  * One structure allocated per process group.
 101  */
 102 struct  pgrp {
 103         LIST_ENTRY(pgrp) pg_list;       /* Hash chain. */
 104         struct proclist pg_members;     /* Pointer to pgrp members. */
 105         struct  session *pg_session;    /* Pointer to session. */
 106         struct  sigiolst pg_sigiolst;   /* List of sigio sources. */
 107         pid_t   pg_id;                  /* Pgrp id. */
 108         int     pg_jobc;        /* # procs qualifying pgrp for job control */
 109         u_int   pg_refs;
 110         struct lwkt_token pg_token;
 111         struct lock pg_lock;
 112 };
 113
 114 #define PS_NOCLDWAIT    0x0001  /* No zombies if child dies */
 115 #define PS_NOCLDSTOP    0x0002  /* No SIGCHLD when children stop. */
 116 #define PS_CLDSIGIGN    0x0004  /* The SIGCHLD handler is SIG_IGN. */
 117
 118 /*
 119  * pargs, used to hold a copy of the command line, if it had a sane
 120  * length
 121  */
 122 struct  pargs {
 123         u_int   ar_ref;         /* Reference count */
 124         u_int   ar_length;      /* Length */
 125         u_char  ar_args[0];     /* Arguments */
 126 };
 127
 128 /*
 129  * Description of a process.
 130  *
 131  * This structure contains the information needed to manage a thread of
 132  * control, known in UN*X as a process; it has references to substructures
 133  * containing descriptions of things that the process uses, but may share
 134  * with related processes.  The process structure and the substructures
 135  * are always addressable except for those marked "(PROC ONLY)" below,
 136  * which might be addressable only on a processor on which the process
 137  * is running.
 138  *
 139  * NOTE!  The process start time is stored in the thread structure associated
 140  * with the process.  If the process is a Zombie, then this field will be
 141  * inaccessible due to the thread structure being free'd in kern_wait1().
 142  */
 143
 144 struct jail;
 145 struct vkernel_proc;
 146 struct vkernel_lwp;
 147 struct vmspace_entry;
 148 struct ktrace_node;
 149 struct sem_undo;
 150
 151 enum lwpstat {
 152         LSRUN = 1,
 153         LSSTOP = 2,
 154         LSSLEEP = 3,
 155 };
 156
 157 enum procstat {
 158         SIDL = 1,
 159         SACTIVE = 2,
 160         SSTOP = 3,
 161         SZOMB = 4,
 162         SCORE = 5,
 163 };
 164
 165 struct lwp {
 166         TAILQ_ENTRY(lwp) lwp_procq;     /* run/sleep queue. */
 167         union {
 168             RB_ENTRY(lwp)       lwp_rbnode;     /* RB tree node - lwp in proc */
 169             LIST_ENTRY(lwp)     lwp_reap_entry; /* reaper list */
 170         } u;
 171
 172         struct proc     *lwp_proc;      /* Link to our proc. */
 173         struct vmspace  *lwp_vmspace;   /* Inherited from p_vmspace */
 174         struct vkernel_lwp *lwp_vkernel;/* VKernel support, lwp part */
 175
 176         lwpid_t         lwp_tid;        /* Our thread id */
 177
 178         u_int           lwp_flags;      /* LWP_*    flags */
 179         u_int           lwp_mpflags;    /* LWP_MP_* flags */
 180         enum lwpstat    lwp_stat;       /* LS* lwp status */
 181         int             lwp_lock;       /* lwp lock (prevent destruct) count */
 182
 183         int             lwp_dupfd;      /* Sideways return value from fdopen */
 184
 185         /*
 186          * The following two fields are marked XXX since (at least) the
 187          * 4.4BSD-Lite2 import.  I can only guess the reason:  It is ugly.
 188          * These fields are used to pass the trap code from trapsignal() to
 189          * postsig(), which gets called later from userret().
 190          *
 191          * The correct "fix" for these XXX is to convert our signal system
 192          * to use signal queues, where each signal can carry its own meta
 193          * data.
 194          */
 195         int             lwp_sig;        /* for core dump/debugger XXX */
 196         u_long          lwp_code;       /* for core dump/debugger XXX */
 197
 198         /*
 199          * Scheduling.
 200          */
 201         sysclock_t      lwp_cpticks;    /* cpu used in sched clock ticks */
 202         sysclock_t      lwp_cpbase;     /* Measurement base */
 203         fixpt_t         lwp_pctcpu;     /* %cpu for this process */
 204         u_int           lwp_slptime;    /* Time since last blocked. */
 205         u_int           lwp_rebal_ticks; /* Timestamp sched on current cpu */
 206
 207         int             lwp_traceflag;  /* Kernel trace points. */
 208
 209         struct rusage   lwp_ru;         /* stats for this lwp */
 210
 211         union usched_data lwp_usdata;   /* User scheduler specific */
 212
 213 #define lwp_startcopy   lwp_cpumask
 214         cpumask_t       lwp_cpumask;
 215         sigset_t        lwp_siglist;    /* Signals arrived but not delivered. */
 216         sigset_t        lwp_oldsigmask; /* saved mask from before sigpause */
 217         sigset_t        lwp_sigmask;    /* Current signal mask. */
 218         stack_t         lwp_sigstk;     /* sp & on stack state variable */
 219
 220         struct rtprio   lwp_rtprio;     /* Realtime priority. */
 221 #define lwp_endcopy     lwp_md
 222
 223         struct mdproc   lwp_md;         /* Any machine-dependent fields. */
 224
 225         struct thread   *lwp_thread;    /* backpointer to proc's thread */
 226         void            *lwp_unused01;  /* for future fields */
 227         struct kqueue   lwp_kqueue;     /* for select/poll */
 228         u_int           lwp_kqueue_serial;
 229         struct lwkt_token lwp_token;    /* per-lwp token for signal/state */
 230         struct spinlock lwp_spin;       /* spinlock for signal handling */
 231         void            *lwp_reserveds1; /* reserved for lwp_saveusp */
 232         void            *lwp_reserveds2; /* reserved for lwp_saveupc */
 233 };
 234
 235 struct  proc {
 236         LIST_ENTRY(proc) p_list;        /* List of all processes. */
 237
 238         /* substructures: */
 239         struct ucred    *p_ucred;       /* Process owner's identity. */
 240         struct filedesc *p_fd;          /* Ptr to open files structure. */
 241         struct filedesc_to_leader *p_fdtol; /* Ptr to tracking node XXX lwp */
 242         struct plimit   *p_limit;       /* Process limits. */
 243         struct pstats   *p_stats;
 244         u_int           p_mqueue_cnt;   /* Count of open mqueues. */
 245         long            p_waitgen;      /* wait interlock allows late signal */
 246         struct sigacts  *p_sigacts;
 247 #define p_sigignore     p_sigacts->ps_sigignore
 248 #define p_sigcatch      p_sigacts->ps_sigcatch
 249 #define p_rlimit        p_limit->pl_rlimit
 250
 251         int             p_flags;        /* P_* flags. */
 252         enum procstat   p_stat;         /* S* process status. */
 253         char            p_pad1[3];
 254
 255         pid_t           p_pid;          /* Process identifier. */
 256         LIST_ENTRY(proc) p_pglist;      /* List of processes in pgrp. */
 257         struct proc     *p_pptr;        /* Pointer to parent process. */
 258         LIST_ENTRY(proc) p_sibling;     /* List of sibling processes. */
 259         struct proclist p_children;     /* Pointer to list of children. */
 260         struct callout  p_ithandle;     /* for scheduling p_realtimer */
 261         struct varsymset p_varsymset;
 262         struct iosched_data p_iosdata;  /* Dynamic I/O scheduling data */
 263
 264         pid_t           p_oppid;        /* Save parent pid during ptrace. XXX */
 265
 266         struct vmspace  *p_vmspace;     /* Current address space. */
 267
 268         unsigned int    p_swtime;       /* Time swapped in or out */
 269
 270         struct itimerval p_realtimer;   /* Alarm timer. */
 271         struct itimerval p_timer[3];    /* Virtual-time timers. */
 272
 273         int             p_traceflag;    /* Kernel trace points. */
 274         struct ktrace_node *p_tracenode; /* Trace to vnode. */
 275
 276         sigset_t        p_siglist;      /* Signals arrived but not delivered. */
 277
 278         struct vnode    *p_textvp;      /* Vnode of executable. */
 279         struct nchandle p_textnch;      /* namecache handle of executable. */
 280
 281         unsigned int    p_stops;        /* procfs event bitmask */
 282         unsigned int    p_stype;        /* procfs stop event type */
 283         char            p_step;         /* procfs stop *once* flag */
 284         unsigned char   p_pfsflags;     /* procfs flags */
 285         char            p_pad2[2];
 286         struct          sigiolst p_sigiolst;    /* list of sigio sources */
 287         int             p_sigparent;    /* signal to parent on exit */
 288         struct klist    p_klist;        /* knotes attached to this process */
 289
 290         struct timeval  p_start;        /* start time for a process */
 291
 292         struct rusage   p_ru;           /* stats for this proc */
 293         struct rusage   p_cru;          /* sum of stats for reaped children */
 294         void            *p_unused01;
 295
 296 /* The following fields are all copied upon creation in fork. */
 297 #define p_startcopy     p_comm
 298
 299         char            p_comm[MAXCOMLEN+1]; /* typ 16+1 bytes */
 300         char            p_pad3;
 301         char            p_nice;         /* Process "nice" value. */
 302         char            p_pad4;
 303         int             p_osrel;        /* release date for binary ELF note */
 304
 305         struct pgrp     *p_pgrp;        /* Pointer to process group. */
 306
 307         struct sysentvec *p_sysent;     /* System call dispatch information. */
 308
 309         struct uprof    p_prof;         /* Profiling arguments. */
 310         struct rtprio   p_rtprio;       /* Realtime priority. */
 311         struct pargs    *p_args;
 312         u_short         p_xstat;        /* Exit status or last stop signal */
 313
 314         int             p_ionice;
 315         void            *p_unused02;
 316 /* End area that is copied on creation. */
 317 #define p_endcopy       p_unused02
 318         u_short         p_acflag;       /* Accounting flags. */
 319
 320         int             p_lock;         /* Prevent proc destruction */
 321         int             p_nthreads;     /* Number of threads in this process. */
 322         int             p_nstopped;     /* Number of stopped threads. */
 323         int             p_lasttid;      /* Last tid used. */
 324         struct lwp_rb_tree p_lwp_tree;  /* RB tree of LWPs for this process */
 325         void            *p_aioinfo;     /* ASYNC I/O info */
 326         int             p_wakeup;       /* thread id XXX lwp */
 327         struct proc     *p_peers;       /* XXX lwp */
 328         struct proc     *p_leader;      /* XXX lwp */
 329         void            *p_emuldata;    /* process-specific emulator state */
 330         struct usched   *p_usched;      /* Userland scheduling control */
 331         struct vkernel_proc *p_vkernel; /* VKernel support, proc part */
 332         int             p_numposixlocks; /* number of POSIX locks */
 333         void            (*p_userret)(void);/* p: return-to-user hook */
 334
 335         struct spinlock p_spin;         /* Spinlock for LWP access to proc */
 336         struct lwkt_token p_token;      /* Token for LWP access to proc */
 337         struct sem_undo *p_sem_undo;    /* Fast semaphore tracking lookup */
 338         void            *p_drv_priv;    /* scp linkage (for syscons) */
 339         void            *p_vmm;
 340         cpulock_t       p_vmm_cpulock;  /* count cpus in and kickout lock */
 341         cpumask_t       p_vmm_cpumask;  /* cpus entering or in vmm */
 342         struct sys_upmap *p_upmap;      /* user RO mappable per-process page */
 343         forkid_t        p_forkid;       /* unique forkid */
 344         struct sysreaper *p_reaper;     /* reaper control */
 345         void            *p_reserveds[3]; /* reserved for future */
 346 };
 347
 348 #define lwp_wchan       lwp_thread->td_wchan
 349 #define lwp_wmesg       lwp_thread->td_wmesg
 350 #define p_session       p_pgrp->pg_session
 351 #define p_pgid          p_pgrp->pg_id
 352
 353 /* These flags are kept in p_flags. */
 354 #define P_ADVLOCK       0x00001 /* Process may hold a POSIX advisory lock */
 355 #define P_CONTROLT      0x00002 /* Has a controlling terminal */
 356 #define P_SWAPPEDOUT    0x00004 /* Swapped out of memory */
 357 #define P_SYSVSEM       0x00008 /* Might have SysV semaphores */
 358 #define P_PPWAIT        0x00010 /* Parent is waiting for child to exec/exit */
 359 #define P_PROFIL        0x00020 /* Has started profiling */
 360 #define P_POSTEXIT      0x00040 /* Prevent procfs from stepping after this pt */
 361 #define P_SCMOUSE       0x00080 /* Process is held by syscons ioctl */
 362                                 /* was: Sleep is interruptible */
 363 #define P_SUGID         0x00100 /* Had set id privileges since last exec */
 364 #define P_SYSTEM        0x00200 /* System proc: no sigs, stats or swapping */
 365 #define P_MAYBETHREADED 0x00400 /* might be threaded optimization */
 366 #define P_TRACED        0x00800 /* Debugged process being traced */
 367 #define P_WAITED        0x01000 /* SIGSTOP status was returned by wait3/4 */
 368 #define P_WEXIT         0x02000 /* Working on exiting (master exit) */
 369 #define P_EXEC          0x04000 /* Process called exec */
 370 #define P_CONTINUED     0x08000 /* Proc has continued from a stopped state */
 371
 372 #define P_UNUSED16      0x00010000
 373 #define P_UNUSED17      0x00020000
 374
 375 #define P_SWAPWAIT      0x00040000 /* Waiting for a swapin */
 376 #define P_UNUSED19      0x00080000 /* was: Now in a zombied state */
 377
 378 /* Marked a kernel thread */
 379 #define P_UNUSED20      0x00100000 /* was: on a user scheduling run queue */
 380 #define P_UNUSED21      0x00200000 /* was: Process is really a kernel thread */
 381 #define P_IDLESWAP      0x00400000 /* Swapout was due to idleswap, not load */
 382
 383 #define P_JAILED        0x01000000 /* Process is in jail */
 384 #define P_SIGVTALRM     0x02000000 /* signal SIGVTALRM pending due to itimer */
 385 #define P_SIGPROF       0x04000000 /* signal SIGPROF pending due to itimer */
 386 #define P_INEXEC        0x08000000 /* Process is in execve(). */
 387 #define P_UNUSED28      0x10000000
 388 #define P_UNUSED29      0x20000000
 389 #define P_XCPU          0x40000000 /* SIGXCPU */
 390
 391 #define LWP_ALTSTACK    0x0000001 /* have alternate signal stack */
 392 #define LWP_OLDMASK     0x0000002 /* need to restore mask before pause */
 393 #define LWP_SINTR       0x0000008 /* Sleep is interruptible. */
 394 #define LWP_SELECT      0x0000010 /* Selecting; wakeup/waiting danger. */
 395 #define LWP_UNUSED20    0x0000020
 396 #define LWP_UNUSED40    0x0000040
 397 #define LWP_UNUSED80    0x0000080
 398 #define LWP_PASSIVE_ACQ 0x0000100 /* Passive acquire cpu (see kern_switch) */
 399 #define LWP_PAGING      0x0000200 /* Currently in vm_fault */
 400
 401 /*
 402  * LWP_MP_WSTOP: When set the thread will stop prior to return to userland
 403  *            and has been counted in the process stop-threads-count, but
 404  *            may still be running in kernel-land.
 405  *
 406  * LWP_MP_WEXIT: When set the thread has been asked to exit and will not return
 407  *            to userland.  p_nthreads will not be decremented until the
 408  *            thread has actually exited.
 409  */
 410 #define LWP_MP_ONRUNQ   0x0000001 /* on a user scheduling run queue */
 411 #define LWP_MP_WEXIT    0x0000002 /* working on exiting (lwpuserret()) */
 412 #define LWP_MP_WSTOP    0x0000004 /* working on stopping */
 413 #define LWP_MP_ULOAD    0x0000008 /* uload accounting for current cpu */
 414 #define LWP_MP_RRFORCE  0x0000010 /* forced resched due to rrcount */
 415 #define LWP_MP_VNLRU    0x0000020 /* check excessive vnode allocations (lwpuserret()) */
 416
 417 #define LWP_MP_URETMASK (LWP_MP_WEXIT | LWP_MP_VNLRU)
 418
 419 #define FIRST_LWP_IN_PROC(p)            RB_FIRST(lwp_rb_tree, &(p)->p_lwp_tree)
 420 #define FOREACH_LWP_IN_PROC(lp, p)      \
 421         RB_FOREACH(lp, lwp_rb_tree, &(p)->p_lwp_tree)
 422 #define ONLY_LWP_IN_PROC(p)             _only_lwp_in_proc(p, __func__)
 423
 424 #ifdef _KERNEL
 425 static inline struct lwp *
 426 _only_lwp_in_proc(struct proc *p, const char *caller)
 427 {
 428         if (p->p_nthreads != 1) {
 429                 panic("%s: proc %p (pid %d cmd %s) has more than one thread",
 430                     caller, p, p->p_pid, p->p_comm);
 431         }
 432         return RB_ROOT(&p->p_lwp_tree);
 433 }
 434 #endif
 435
 436 /*
 437  * We use process IDs <= PID_MAX.  NO_PID must also fit in a pid_t and
 438  * is used to represent "no process group".
 439  */
 440 #define PID_MAX         999999
 441 #define NO_PID          0x7FFFFFFF
 442
 443 #define SESS_LEADER(p)  ((p)->p_session->s_leader == (p))
 444
 445 #ifdef _KERNEL
 446
 447 #ifdef MALLOC_DECLARE
 448 MALLOC_DECLARE(M_SESSION);
 449 MALLOC_DECLARE(M_PROC);
 450 MALLOC_DECLARE(M_LWP);
 451 MALLOC_DECLARE(M_SUBPROC);
 452 MALLOC_DECLARE(M_PARGS);
 453 #endif
 454
 455 /* for priv_check_cred() */
 456 #define NULL_CRED_OKAY  0x2
 457
 458 /* Handy macro to determine if p1 can mangle p2 */
 459
 460 #define PRISON_CHECK(cr1, cr2) \
 461         ((!(cr1)->cr_prison) || (cr1)->cr_prison == (cr2)->cr_prison)
 462
 463 /*
 464  * STOPEVENT
 465  */
 466 extern void stopevent(struct proc*, unsigned int, unsigned int);
 467 #define STOPEVENT(p,e,v)                        \
 468         do {                                    \
 469                 if ((p)->p_stops & (e)) {       \
 470                         stopevent(p,e,v);       \
 471                 }                               \
 472         } while (0)
 473
 474 /*
 475  * Hold process in memory, don't destruct, used by ktrace, procfs, sigio,
 476  * and signaling code (e.g. ksignal()).
 477  *
 478  * MPSAFE
 479  */
 480 #define PHOLD(p)        phold((p))
 481 #define PRELE(p)        prele((p))
 482 #define PHOLDZOMB(p)    pholdzomb((p))
 483 #define PRELEZOMB(p)    prelezomb((p))
 484 #define PSTALL(p, msg, n) \
 485         do { if ((p)->p_lock > (n)) pstall((p), (msg), (n)); } while (0)
 486
 487 #define STOPLWP(p, lp)                                          \
 488         (((p)->p_stat == SSTOP || (p)->p_stat == SCORE) &&      \
 489          ((lp)->lwp_mpflags & LWP_MP_WEXIT) == 0)
 490
 491 /*
 492  * Hold lwp in memory, don't destruct, normally for ptrace/procfs work
 493  * atomic ops because they can occur from an IPI.
 494  * MPSAFE
 495  */
 496 #define LWPHOLD(lp)     atomic_add_int(&(lp)->lwp_lock, 1)
 497 #define LWPRELE(lp)     atomic_add_int(&(lp)->lwp_lock, -1)
 498
 499 extern struct proc proc0;               /* Process slot for swapper. */
 500 extern struct lwp lwp0;                 /* LWP slot for swapper. */
 501 extern struct thread thread0;           /* Thread slot for swapper. */
 502 extern int nprocs, maxproc;             /* Current and max number of procs. */
 503 extern int maxprocperuid;               /* Max procs per uid. */
 504 extern int sched_quantum;               /* Scheduling quantum in ticks */
 505
 506 extern struct proc *initproc;           /* Process slot for init */
 507 extern struct thread *pagethread, *updatethread;
 508
 509 /*
 510  * Scheduler independant variables.  The primary scheduler polling frequency,
 511  * the maximum ESTCPU value, and the weighting factor for nice values.  A
 512  * cpu bound program's estcpu will increase to ESTCPUMAX - 1.
 513  */
 514 #define ESTCPUFREQ      50
 515
 516 extern  u_long ps_arg_cache_limit;
 517 extern  int ps_argsopen;
 518 extern  int ps_showallprocs;
 519
 520 struct proc *pfind (pid_t);     /* Find process by id w/ref */
 521 struct proc *pfindn (pid_t);    /* Find process by id wo/ref */
 522 struct pgrp *pgfind (pid_t);    /* Find process group by id w/ref */
 523 struct proc *zpfind (pid_t);    /* Find zombie process by id w/ref */
 524 void pgref (struct pgrp *);     /* Ref pgrp preventing disposal */
 525 void pgrel (struct pgrp *);     /* Deref pgrp & dispose on 1->0 trans */
 526
 527 struct globaldata;
 528 struct lwp_params;
 529
 530 int     enterpgrp (struct proc *p, pid_t pgid, int mksess);
 531 void    proc_add_allproc(struct proc *p);
 532 void    proc_move_allproc_zombie(struct proc *);
 533 void    proc_remove_zombie(struct proc *);
 534 void    allproc_scan(int (*callback)(struct proc *, void *), void *data);
 535 void    alllwp_scan(int (*callback)(struct lwp *, void *), void *data);
 536 void    zombproc_scan(int (*callback)(struct proc *, void *), void *data);
 537 void    fixjobc (struct proc *p, struct pgrp *pgrp, int entering);
 538 void    updatepcpu(struct lwp *, int, int);
 539 int     inferior (struct proc *p);
 540 int     leavepgrp (struct proc *p);
 541 void    sess_hold(struct session *sp);
 542 void    sess_rele(struct session *sp);
 543 void    procinit (void);
 544 void    procinsertinit(struct proc *p);
 545 void    sessinsertinit(struct session *sess);
 546 void    pgrpinsertinit(struct pgrp *pg);
 547 void    relscurproc(struct proc *curp);
 548 int     p_trespass (struct ucred *cr1, struct ucred *cr2);
 549 void    setrunnable (struct lwp *);
 550 void    proc_stop (struct proc *, int);
 551 void    proc_unstop (struct proc *, int);
 552 void    sleep_gdinit (struct globaldata *);
 553 thread_t cpu_heavy_switch (struct thread *);
 554 thread_t cpu_lwkt_switch (struct thread *);
 555
 556 void    cpu_lwp_exit (void) __dead2;
 557 void    cpu_thread_exit (void) __dead2;
 558 void    lwp_exit (int masterexit, void *waddr) __dead2;
 559 void    lwp_dispose (struct lwp *);
 560 int     killalllwps (int);
 561 void    exit1 (int) __dead2;
 562 void    cpu_fork (struct lwp *, struct lwp *, int);
 563 int     cpu_prepare_lwp(struct lwp *, struct lwp_params *);
 564 void    cpu_set_fork_handler (struct lwp *, void (*)(void *, struct trapframe *), void *);
 565 void    cpu_set_thread_handler(struct thread *td, void (*retfunc)(void), void *func, void *arg);
 566 int     fork1 (struct lwp *, int, struct proc **);
 567 void    start_forked_proc (struct lwp *, struct proc *);
 568 int     trace_req (struct proc *);
 569 void    cpu_thread_wait (struct thread *);
 570 void    setsugid (void);
 571 void    faultin (struct proc *p);
 572 void    swapin_request (void);
 573 void    phold (struct proc *);
 574 void    prele (struct proc *);
 575 int     pholdzomb (struct proc *);
 576 void    prelezomb (struct proc *);
 577 void    pstall (struct proc *, const char *, int);
 578 void    lwpuserret(struct lwp *);
 579 void    lwpkthreaddeferred(void);
 580 void    proc_usermap(struct proc *p, int invfork);
 581 void    proc_userunmap(struct proc *p);
 582 void    reaper_hold(struct sysreaper *reap);
 583 void    reaper_drop(struct sysreaper *reap);
 584 struct sysreaper *reaper_exit(struct proc *p);
 585 void    reaper_init(struct proc *p, struct sysreaper *reap);
 586 struct proc *reaper_get(struct sysreaper *reap);
 587
 588 u_int32_t       procrunnable (void);
 589
 590 #endif  /* _KERNEL */
 591
 592 #endif  /* _KERNEL || _KERNEL_STRUCTURES */
 593 #endif  /* !_SYS_PROC_H_ */