The Design and Implementation of the FreeBSD Operating System, Second Edition
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FreeBSD/Linux Kernel Cross Reference
sys/sys/proc.h

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    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  * 4. 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  *      @(#)proc.h      8.15 (Berkeley) 5/19/95
   35  * $FreeBSD: releng/9.0/sys/sys/proc.h 227886 2011-11-23 15:16:05Z kib $
   36  */
   37 
   38 #ifndef _SYS_PROC_H_
   39 #define _SYS_PROC_H_
   40 
   41 #include <sys/callout.h>                /* For struct callout. */
   42 #include <sys/event.h>                  /* For struct klist. */
   43 #include <sys/condvar.h>
   44 #ifndef _KERNEL
   45 #include <sys/filedesc.h>
   46 #endif
   47 #include <sys/queue.h>
   48 #include <sys/_lock.h>
   49 #include <sys/lock_profile.h>
   50 #include <sys/_mutex.h>
   51 #include <sys/osd.h>
   52 #include <sys/priority.h>
   53 #include <sys/rtprio.h>                 /* XXX. */
   54 #include <sys/runq.h>
   55 #include <sys/resource.h>
   56 #include <sys/sigio.h>
   57 #include <sys/signal.h>
   58 #include <sys/signalvar.h>
   59 #ifndef _KERNEL
   60 #include <sys/time.h>                   /* For structs itimerval, timeval. */
   61 #else
   62 #include <sys/pcpu.h>
   63 #endif
   64 #include <sys/ucontext.h>
   65 #include <sys/ucred.h>
   66 #include <machine/proc.h>               /* Machine-dependent proc substruct. */
   67 
   68 /*
   69  * One structure allocated per session.
   70  *
   71  * List of locks
   72  * (m)          locked by s_mtx mtx
   73  * (e)          locked by proctree_lock sx
   74  * (c)          const until freeing
   75  */
   76 struct session {
   77         u_int           s_count;        /* Ref cnt; pgrps in session - atomic. */
   78         struct proc     *s_leader;      /* (m + e) Session leader. */
   79         struct vnode    *s_ttyvp;       /* (m) Vnode of controlling tty. */
   80         struct cdev_priv *s_ttydp;      /* (m) Device of controlling tty.  */
   81         struct tty      *s_ttyp;        /* (e) Controlling tty. */
   82         pid_t           s_sid;          /* (c) Session ID. */
   83                                         /* (m) Setlogin() name: */
   84         char            s_login[roundup(MAXLOGNAME, sizeof(long))];
   85         struct mtx      s_mtx;          /* Mutex to protect members. */
   86 };
   87 
   88 /*
   89  * One structure allocated per process group.
   90  *
   91  * List of locks
   92  * (m)          locked by pg_mtx mtx
   93  * (e)          locked by proctree_lock sx
   94  * (c)          const until freeing
   95  */
   96 struct pgrp {
   97         LIST_ENTRY(pgrp) pg_hash;       /* (e) Hash chain. */
   98         LIST_HEAD(, proc) pg_members;   /* (m + e) Pointer to pgrp members. */
   99         struct session  *pg_session;    /* (c) Pointer to session. */
  100         struct sigiolst pg_sigiolst;    /* (m) List of sigio sources. */
  101         pid_t           pg_id;          /* (c) Process group id. */
  102         int             pg_jobc;        /* (m) Job control process count. */
  103         struct mtx      pg_mtx;         /* Mutex to protect members */
  104 };
  105 
  106 /*
  107  * pargs, used to hold a copy of the command line, if it had a sane length.
  108  */
  109 struct pargs {
  110         u_int   ar_ref;         /* Reference count. */
  111         u_int   ar_length;      /* Length. */
  112         u_char  ar_args[1];     /* Arguments. */
  113 };
  114 
  115 /*-
  116  * Description of a process.
  117  *
  118  * This structure contains the information needed to manage a thread of
  119  * control, known in UN*X as a process; it has references to substructures
  120  * containing descriptions of things that the process uses, but may share
  121  * with related processes.  The process structure and the substructures
  122  * are always addressable except for those marked "(CPU)" below,
  123  * which might be addressable only on a processor on which the process
  124  * is running.
  125  *
  126  * Below is a key of locks used to protect each member of struct proc.  The
  127  * lock is indicated by a reference to a specific character in parens in the
  128  * associated comment.
  129  *      * - not yet protected
  130  *      a - only touched by curproc or parent during fork/wait
  131  *      b - created at fork, never changes
  132  *              (exception aiods switch vmspaces, but they are also
  133  *              marked 'P_SYSTEM' so hopefully it will be left alone)
  134  *      c - locked by proc mtx
  135  *      d - locked by allproc_lock lock
  136  *      e - locked by proctree_lock lock
  137  *      f - session mtx
  138  *      g - process group mtx
  139  *      h - callout_lock mtx
  140  *      i - by curproc or the master session mtx
  141  *      j - locked by proc slock
  142  *      k - only accessed by curthread
  143  *      k*- only accessed by curthread and from an interrupt
  144  *      l - the attaching proc or attaching proc parent
  145  *      m - Giant
  146  *      n - not locked, lazy
  147  *      o - ktrace lock
  148  *      q - td_contested lock
  149  *      r - p_peers lock
  150  *      t - thread lock
  151  *      x - created at fork, only changes during single threading in exec
  152  *      y - created at first aio, doesn't change until exit or exec at which
  153  *          point we are single-threaded and only curthread changes it
  154  *      z - zombie threads lock
  155  *
  156  * If the locking key specifies two identifiers (for example, p_pptr) then
  157  * either lock is sufficient for read access, but both locks must be held
  158  * for write access.
  159  */
  160 struct cpuset;
  161 struct kaioinfo;
  162 struct kaudit_record;
  163 struct kdtrace_proc;
  164 struct kdtrace_thread;
  165 struct mqueue_notifier;
  166 struct nlminfo;
  167 struct p_sched;
  168 struct proc;
  169 struct procdesc;
  170 struct racct;
  171 struct sleepqueue;
  172 struct td_sched;
  173 struct thread;
  174 struct trapframe;
  175 struct turnstile;
  176 
  177 /*
  178  * XXX: Does this belong in resource.h or resourcevar.h instead?
  179  * Resource usage extension.  The times in rusage structs in the kernel are
  180  * never up to date.  The actual times are kept as runtimes and tick counts
  181  * (with control info in the "previous" times), and are converted when
  182  * userland asks for rusage info.  Backwards compatibility prevents putting
  183  * this directly in the user-visible rusage struct.
  184  *
  185  * Locking for p_rux: (cj) means (j) for p_rux and (c) for p_crux.
  186  * Locking for td_rux: (t) for all fields.
  187  */
  188 struct rusage_ext {
  189         uint64_t        rux_runtime;    /* (cj) Real time. */
  190         uint64_t        rux_uticks;     /* (cj) Statclock hits in user mode. */
  191         uint64_t        rux_sticks;     /* (cj) Statclock hits in sys mode. */
  192         uint64_t        rux_iticks;     /* (cj) Statclock hits in intr mode. */
  193         uint64_t        rux_uu;         /* (c) Previous user time in usec. */
  194         uint64_t        rux_su;         /* (c) Previous sys time in usec. */
  195         uint64_t        rux_tu;         /* (c) Previous total time in usec. */
  196 };
  197 
  198 /*
  199  * Kernel runnable context (thread).
  200  * This is what is put to sleep and reactivated.
  201  * Thread context.  Processes may have multiple threads.
  202  */
  203 struct thread {
  204         struct mtx      *volatile td_lock; /* replaces sched lock */
  205         struct proc     *td_proc;       /* (*) Associated process. */
  206         TAILQ_ENTRY(thread) td_plist;   /* (*) All threads in this proc. */
  207         TAILQ_ENTRY(thread) td_runq;    /* (t) Run queue. */
  208         TAILQ_ENTRY(thread) td_slpq;    /* (t) Sleep queue. */
  209         TAILQ_ENTRY(thread) td_lockq;   /* (t) Lock queue. */
  210         LIST_ENTRY(thread) td_hash;     /* (d) Hash chain. */
  211         struct cpuset   *td_cpuset;     /* (t) CPU affinity mask. */
  212         struct seltd    *td_sel;        /* Select queue/channel. */
  213         struct sleepqueue *td_sleepqueue; /* (k) Associated sleep queue. */
  214         struct turnstile *td_turnstile; /* (k) Associated turnstile. */
  215         struct umtx_q   *td_umtxq;      /* (c?) Link for when we're blocked. */
  216         lwpid_t         td_tid;         /* (b) Thread ID. */
  217         sigqueue_t      td_sigqueue;    /* (c) Sigs arrived, not delivered. */
  218 #define td_siglist      td_sigqueue.sq_signals
  219         u_char          td_lend_user_pri; /* (t) Lend user pri. */
  220 
  221 /* Cleared during fork1() */
  222 #define td_startzero td_flags
  223         int             td_flags;       /* (t) TDF_* flags. */
  224         int             td_inhibitors;  /* (t) Why can not run. */
  225         int             td_pflags;      /* (k) Private thread (TDP_*) flags. */
  226         int             td_dupfd;       /* (k) Ret value from fdopen. XXX */
  227         int             td_sqqueue;     /* (t) Sleepqueue queue blocked on. */
  228         void            *td_wchan;      /* (t) Sleep address. */
  229         const char      *td_wmesg;      /* (t) Reason for sleep. */
  230         u_char          td_lastcpu;     /* (t) Last cpu we were on. */
  231         u_char          td_oncpu;       /* (t) Which cpu we are on. */
  232         volatile u_char td_owepreempt;  /* (k*) Preempt on last critical_exit */
  233         u_char          td_tsqueue;     /* (t) Turnstile queue blocked on. */
  234         short           td_locks;       /* (k) Count of non-spin locks. */
  235         short           td_rw_rlocks;   /* (k) Count of rwlock read locks. */
  236         short           td_lk_slocks;   /* (k) Count of lockmgr shared locks. */
  237         struct turnstile *td_blocked;   /* (t) Lock thread is blocked on. */
  238         const char      *td_lockname;   /* (t) Name of lock blocked on. */
  239         LIST_HEAD(, turnstile) td_contested;    /* (q) Contested locks. */
  240         struct lock_list_entry *td_sleeplocks; /* (k) Held sleep locks. */
  241         int             td_intr_nesting_level; /* (k) Interrupt recursion. */
  242         int             td_pinned;      /* (k) Temporary cpu pin count. */
  243         struct ucred    *td_ucred;      /* (k) Reference to credentials. */
  244         u_int           td_estcpu;      /* (t) estimated cpu utilization */
  245         int             td_slptick;     /* (t) Time at sleep. */
  246         int             td_blktick;     /* (t) Time spent blocked. */
  247         int             td_swvoltick;   /* (t) Time at last SW_VOL switch. */
  248         struct rusage   td_ru;          /* (t) rusage information. */
  249         struct rusage_ext td_rux;       /* (t) Internal rusage information. */
  250         uint64_t        td_incruntime;  /* (t) Cpu ticks to transfer to proc. */
  251         uint64_t        td_runtime;     /* (t) How many cpu ticks we've run. */
  252         u_int           td_pticks;      /* (t) Statclock hits for profiling */
  253         u_int           td_sticks;      /* (t) Statclock hits in system mode. */
  254         u_int           td_iticks;      /* (t) Statclock hits in intr mode. */
  255         u_int           td_uticks;      /* (t) Statclock hits in user mode. */
  256         int             td_intrval;     /* (t) Return value for sleepq. */
  257         sigset_t        td_oldsigmask;  /* (k) Saved mask from pre sigpause. */
  258         sigset_t        td_sigmask;     /* (c) Current signal mask. */
  259         volatile u_int  td_generation;  /* (k) For detection of preemption */
  260         stack_t         td_sigstk;      /* (k) Stack ptr and on-stack flag. */
  261         int             td_xsig;        /* (c) Signal for ptrace */
  262         u_long          td_profil_addr; /* (k) Temporary addr until AST. */
  263         u_int           td_profil_ticks; /* (k) Temporary ticks until AST. */
  264         char            td_name[MAXCOMLEN + 1]; /* (*) Thread name. */
  265         struct file     *td_fpop;       /* (k) file referencing cdev under op */
  266         int             td_dbgflags;    /* (c) Userland debugger flags */
  267         struct ksiginfo td_dbgksi;      /* (c) ksi reflected to debugger. */
  268         int             td_ng_outbound; /* (k) Thread entered ng from above. */
  269         struct osd      td_osd;         /* (k) Object specific data. */
  270         struct vm_map_entry *td_map_def_user; /* (k) Deferred entries. */
  271         pid_t           td_dbg_forked;  /* (c) Child pid for debugger. */
  272 #define td_endzero td_rqindex
  273 
  274 /* Copied during fork1() or thread_sched_upcall(). */
  275 #define td_startcopy td_endzero
  276         u_char          td_rqindex;     /* (t) Run queue index. */
  277         u_char          td_base_pri;    /* (t) Thread base kernel priority. */
  278         u_char          td_priority;    /* (t) Thread active priority. */
  279         u_char          td_pri_class;   /* (t) Scheduling class. */
  280         u_char          td_user_pri;    /* (t) User pri from estcpu and nice. */
  281         u_char          td_base_user_pri; /* (t) Base user pri */
  282 #define td_endcopy td_pcb
  283 
  284 /*
  285  * Fields that must be manually set in fork1() or thread_sched_upcall()
  286  * or already have been set in the allocator, constructor, etc.
  287  */
  288         struct pcb      *td_pcb;        /* (k) Kernel VA of pcb and kstack. */
  289         enum {
  290                 TDS_INACTIVE = 0x0,
  291                 TDS_INHIBITED,
  292                 TDS_CAN_RUN,
  293                 TDS_RUNQ,
  294                 TDS_RUNNING
  295         } td_state;                     /* (t) thread state */
  296         register_t      td_retval[2];   /* (k) Syscall aux returns. */
  297         struct callout  td_slpcallout;  /* (h) Callout for sleep. */
  298         struct trapframe *td_frame;     /* (k) */
  299         struct vm_object *td_kstack_obj;/* (a) Kstack object. */
  300         vm_offset_t     td_kstack;      /* (a) Kernel VA of kstack. */
  301         int             td_kstack_pages; /* (a) Size of the kstack. */
  302         volatile u_int  td_critnest;    /* (k*) Critical section nest level. */
  303         struct mdthread td_md;          /* (k) Any machine-dependent fields. */
  304         struct td_sched *td_sched;      /* (*) Scheduler-specific data. */
  305         struct kaudit_record    *td_ar; /* (k) Active audit record, if any. */
  306         struct lpohead  td_lprof[2];    /* (a) lock profiling objects. */
  307         struct kdtrace_thread   *td_dtrace; /* (*) DTrace-specific data. */
  308         int             td_errno;       /* Error returned by last syscall. */
  309         struct vnet     *td_vnet;       /* (k) Effective vnet. */
  310         const char      *td_vnet_lpush; /* (k) Debugging vnet push / pop. */
  311         struct trapframe *td_intr_frame;/* (k) Frame of the current irq */
  312 };
  313 
  314 struct mtx *thread_lock_block(struct thread *);
  315 void thread_lock_unblock(struct thread *, struct mtx *);
  316 void thread_lock_set(struct thread *, struct mtx *);
  317 #define THREAD_LOCK_ASSERT(td, type)                                    \
  318 do {                                                                    \
  319         struct mtx *__m = (td)->td_lock;                                \
  320         if (__m != &blocked_lock)                                       \
  321                 mtx_assert(__m, (type));                                \
  322 } while (0)
  323 
  324 #ifdef INVARIANTS
  325 #define THREAD_LOCKPTR_ASSERT(td, lock)                                 \
  326 do {                                                                    \
  327         struct mtx *__m = (td)->td_lock;                                \
  328         KASSERT((__m == &blocked_lock || __m == (lock)),                \
  329             ("Thread %p lock %p does not match %p", td, __m, (lock)));  \
  330 } while (0)
  331 #else
  332 #define THREAD_LOCKPTR_ASSERT(td, lock)
  333 #endif
  334 
  335 #define CRITICAL_ASSERT(td)                                             \
  336     KASSERT((td)->td_critnest >= 1, ("Not in critical section"));
  337 
  338 /*
  339  * Flags kept in td_flags:
  340  * To change these you MUST have the scheduler lock.
  341  */
  342 #define TDF_BORROWING   0x00000001 /* Thread is borrowing pri from another. */
  343 #define TDF_INPANIC     0x00000002 /* Caused a panic, let it drive crashdump. */
  344 #define TDF_INMEM       0x00000004 /* Thread's stack is in memory. */
  345 #define TDF_SINTR       0x00000008 /* Sleep is interruptible. */
  346 #define TDF_TIMEOUT     0x00000010 /* Timing out during sleep. */
  347 #define TDF_IDLETD      0x00000020 /* This is a per-CPU idle thread. */
  348 #define TDF_CANSWAP     0x00000040 /* Thread can be swapped. */
  349 #define TDF_SLEEPABORT  0x00000080 /* sleepq_abort was called. */
  350 #define TDF_KTH_SUSP    0x00000100 /* kthread is suspended */
  351 #define TDF_UNUSED09    0x00000200 /* --available-- */
  352 #define TDF_BOUNDARY    0x00000400 /* Thread suspended at user boundary */
  353 #define TDF_ASTPENDING  0x00000800 /* Thread has some asynchronous events. */
  354 #define TDF_TIMOFAIL    0x00001000 /* Timeout from sleep after we were awake. */
  355 #define TDF_SBDRY       0x00002000 /* Stop only on usermode boundary. */
  356 #define TDF_UPIBLOCKED  0x00004000 /* Thread blocked on user PI mutex. */
  357 #define TDF_NEEDSUSPCHK 0x00008000 /* Thread may need to suspend. */
  358 #define TDF_NEEDRESCHED 0x00010000 /* Thread needs to yield. */
  359 #define TDF_NEEDSIGCHK  0x00020000 /* Thread may need signal delivery. */
  360 #define TDF_NOLOAD      0x00040000 /* Ignore during load avg calculations. */
  361 #define TDF_UNUSED19    0x00080000 /* --available-- */
  362 #define TDF_THRWAKEUP   0x00100000 /* Libthr thread must not suspend itself. */
  363 #define TDF_UNUSED21    0x00200000 /* --available-- */
  364 #define TDF_SWAPINREQ   0x00400000 /* Swapin request due to wakeup. */
  365 #define TDF_UNUSED23    0x00800000 /* --available-- */
  366 #define TDF_SCHED0      0x01000000 /* Reserved for scheduler private use */
  367 #define TDF_SCHED1      0x02000000 /* Reserved for scheduler private use */
  368 #define TDF_SCHED2      0x04000000 /* Reserved for scheduler private use */
  369 #define TDF_SCHED3      0x08000000 /* Reserved for scheduler private use */
  370 #define TDF_ALRMPEND    0x10000000 /* Pending SIGVTALRM needs to be posted. */
  371 #define TDF_PROFPEND    0x20000000 /* Pending SIGPROF needs to be posted. */
  372 #define TDF_MACPEND     0x40000000 /* AST-based MAC event pending. */
  373 
  374 /* Userland debug flags */
  375 #define TDB_SUSPEND     0x00000001 /* Thread is suspended by debugger */
  376 #define TDB_XSIG        0x00000002 /* Thread is exchanging signal under trace */
  377 #define TDB_USERWR      0x00000004 /* Debugger modified memory or registers */
  378 #define TDB_SCE         0x00000008 /* Thread performs syscall enter */
  379 #define TDB_SCX         0x00000010 /* Thread performs syscall exit */
  380 #define TDB_EXEC        0x00000020 /* TDB_SCX from exec(2) family */
  381 #define TDB_FORK        0x00000040 /* TDB_SCX from fork(2) that created new
  382                                       process */
  383 #define TDB_STOPATFORK  0x00000080 /* Stop at the return from fork (child
  384                                       only) */
  385 
  386 /*
  387  * "Private" flags kept in td_pflags:
  388  * These are only written by curthread and thus need no locking.
  389  */
  390 #define TDP_OLDMASK     0x00000001 /* Need to restore mask after suspend. */
  391 #define TDP_INKTR       0x00000002 /* Thread is currently in KTR code. */
  392 #define TDP_INKTRACE    0x00000004 /* Thread is currently in KTRACE code. */
  393 #define TDP_BUFNEED     0x00000008 /* Do not recurse into the buf flush */
  394 #define TDP_COWINPROGRESS 0x00000010 /* Snapshot copy-on-write in progress. */
  395 #define TDP_ALTSTACK    0x00000020 /* Have alternate signal stack. */
  396 #define TDP_DEADLKTREAT 0x00000040 /* Lock aquisition - deadlock treatment. */
  397 #define TDP_NOFAULTING  0x00000080 /* Do not handle page faults. */
  398 #define TDP_NOSLEEPING  0x00000100 /* Thread is not allowed to sleep on a sq. */
  399 #define TDP_OWEUPC      0x00000200 /* Call addupc() at next AST. */
  400 #define TDP_ITHREAD     0x00000400 /* Thread is an interrupt thread. */
  401 #define TDP_UNUSED800   0x00000800 /* available. */
  402 #define TDP_SCHED1      0x00001000 /* Reserved for scheduler private use */
  403 #define TDP_SCHED2      0x00002000 /* Reserved for scheduler private use */
  404 #define TDP_SCHED3      0x00004000 /* Reserved for scheduler private use */
  405 #define TDP_SCHED4      0x00008000 /* Reserved for scheduler private use */
  406 #define TDP_GEOM        0x00010000 /* Settle GEOM before finishing syscall */
  407 #define TDP_SOFTDEP     0x00020000 /* Stuck processing softdep worklist */
  408 #define TDP_NORUNNINGBUF 0x00040000 /* Ignore runningbufspace check */
  409 #define TDP_WAKEUP      0x00080000 /* Don't sleep in umtx cond_wait */
  410 #define TDP_INBDFLUSH   0x00100000 /* Already in BO_BDFLUSH, do not recurse */
  411 #define TDP_KTHREAD     0x00200000 /* This is an official kernel thread */
  412 #define TDP_CALLCHAIN   0x00400000 /* Capture thread's callchain */
  413 #define TDP_IGNSUSP     0x00800000 /* Permission to ignore the MNTK_SUSPEND* */
  414 #define TDP_AUDITREC    0x01000000 /* Audit record pending on thread */
  415 
  416 /*
  417  * Reasons that the current thread can not be run yet.
  418  * More than one may apply.
  419  */
  420 #define TDI_SUSPENDED   0x0001  /* On suspension queue. */
  421 #define TDI_SLEEPING    0x0002  /* Actually asleep! (tricky). */
  422 #define TDI_SWAPPED     0x0004  /* Stack not in mem.  Bad juju if run. */
  423 #define TDI_LOCK        0x0008  /* Stopped on a lock. */
  424 #define TDI_IWAIT       0x0010  /* Awaiting interrupt. */
  425 
  426 #define TD_IS_SLEEPING(td)      ((td)->td_inhibitors & TDI_SLEEPING)
  427 #define TD_ON_SLEEPQ(td)        ((td)->td_wchan != NULL)
  428 #define TD_IS_SUSPENDED(td)     ((td)->td_inhibitors & TDI_SUSPENDED)
  429 #define TD_IS_SWAPPED(td)       ((td)->td_inhibitors & TDI_SWAPPED)
  430 #define TD_ON_LOCK(td)          ((td)->td_inhibitors & TDI_LOCK)
  431 #define TD_AWAITING_INTR(td)    ((td)->td_inhibitors & TDI_IWAIT)
  432 #define TD_IS_RUNNING(td)       ((td)->td_state == TDS_RUNNING)
  433 #define TD_ON_RUNQ(td)          ((td)->td_state == TDS_RUNQ)
  434 #define TD_CAN_RUN(td)          ((td)->td_state == TDS_CAN_RUN)
  435 #define TD_IS_INHIBITED(td)     ((td)->td_state == TDS_INHIBITED)
  436 #define TD_ON_UPILOCK(td)       ((td)->td_flags & TDF_UPIBLOCKED)
  437 #define TD_IS_IDLETHREAD(td)    ((td)->td_flags & TDF_IDLETD)
  438 
  439 
  440 #define TD_SET_INHIB(td, inhib) do {                    \
  441         (td)->td_state = TDS_INHIBITED;                 \
  442         (td)->td_inhibitors |= (inhib);                 \
  443 } while (0)
  444 
  445 #define TD_CLR_INHIB(td, inhib) do {                    \
  446         if (((td)->td_inhibitors & (inhib)) &&          \
  447             (((td)->td_inhibitors &= ~(inhib)) == 0))   \
  448                 (td)->td_state = TDS_CAN_RUN;           \
  449 } while (0)
  450 
  451 #define TD_SET_SLEEPING(td)     TD_SET_INHIB((td), TDI_SLEEPING)
  452 #define TD_SET_SWAPPED(td)      TD_SET_INHIB((td), TDI_SWAPPED)
  453 #define TD_SET_LOCK(td)         TD_SET_INHIB((td), TDI_LOCK)
  454 #define TD_SET_SUSPENDED(td)    TD_SET_INHIB((td), TDI_SUSPENDED)
  455 #define TD_SET_IWAIT(td)        TD_SET_INHIB((td), TDI_IWAIT)
  456 #define TD_SET_EXITING(td)      TD_SET_INHIB((td), TDI_EXITING)
  457 
  458 #define TD_CLR_SLEEPING(td)     TD_CLR_INHIB((td), TDI_SLEEPING)
  459 #define TD_CLR_SWAPPED(td)      TD_CLR_INHIB((td), TDI_SWAPPED)
  460 #define TD_CLR_LOCK(td)         TD_CLR_INHIB((td), TDI_LOCK)
  461 #define TD_CLR_SUSPENDED(td)    TD_CLR_INHIB((td), TDI_SUSPENDED)
  462 #define TD_CLR_IWAIT(td)        TD_CLR_INHIB((td), TDI_IWAIT)
  463 
  464 #define TD_SET_RUNNING(td)      (td)->td_state = TDS_RUNNING
  465 #define TD_SET_RUNQ(td)         (td)->td_state = TDS_RUNQ
  466 #define TD_SET_CAN_RUN(td)      (td)->td_state = TDS_CAN_RUN
  467 
  468 /*
  469  * Process structure.
  470  */
  471 struct proc {
  472         LIST_ENTRY(proc) p_list;        /* (d) List of all processes. */
  473         TAILQ_HEAD(, thread) p_threads; /* (c) all threads. */
  474         struct mtx      p_slock;        /* process spin lock */
  475         struct ucred    *p_ucred;       /* (c) Process owner's identity. */
  476         struct filedesc *p_fd;          /* (b) Open files. */
  477         struct filedesc_to_leader *p_fdtol; /* (b) Tracking node */
  478         struct pstats   *p_stats;       /* (b) Accounting/statistics (CPU). */
  479         struct plimit   *p_limit;       /* (c) Process limits. */
  480         struct callout  p_limco;        /* (c) Limit callout handle */
  481         struct sigacts  *p_sigacts;     /* (x) Signal actions, state (CPU). */
  482 
  483         /*
  484          * The following don't make too much sense.
  485          * See the td_ or ke_ versions of the same flags.
  486          */
  487         int             p_flag;         /* (c) P_* flags. */
  488         enum {
  489                 PRS_NEW = 0,            /* In creation */
  490                 PRS_NORMAL,             /* threads can be run. */
  491                 PRS_ZOMBIE
  492         } p_state;                      /* (j/c) Process status. */
  493         pid_t           p_pid;          /* (b) Process identifier. */
  494         LIST_ENTRY(proc) p_hash;        /* (d) Hash chain. */
  495         LIST_ENTRY(proc) p_pglist;      /* (g + e) List of processes in pgrp. */
  496         struct proc     *p_pptr;        /* (c + e) Pointer to parent process. */
  497         LIST_ENTRY(proc) p_sibling;     /* (e) List of sibling processes. */
  498         LIST_HEAD(, proc) p_children;   /* (e) Pointer to list of children. */
  499         struct mtx      p_mtx;          /* (n) Lock for this struct. */
  500         struct ksiginfo *p_ksi; /* Locked by parent proc lock */
  501         sigqueue_t      p_sigqueue;     /* (c) Sigs not delivered to a td. */
  502 #define p_siglist       p_sigqueue.sq_signals
  503 
  504 /* The following fields are all zeroed upon creation in fork. */
  505 #define p_startzero     p_oppid
  506         pid_t           p_oppid;        /* (c + e) Save ppid in ptrace. XXX */
  507         int             p_dbg_child;    /* (c + e) # of debugged children in
  508                                                         ptrace. */
  509         struct vmspace  *p_vmspace;     /* (b) Address space. */
  510         u_int           p_swtick;       /* (c) Tick when swapped in or out. */
  511         struct itimerval p_realtimer;   /* (c) Alarm timer. */
  512         struct rusage   p_ru;           /* (a) Exit information. */
  513         struct rusage_ext p_rux;        /* (cj) Internal resource usage. */
  514         struct rusage_ext p_crux;       /* (c) Internal child resource usage. */
  515         int             p_profthreads;  /* (c) Num threads in addupc_task. */
  516         volatile int    p_exitthreads;  /* (j) Number of threads exiting */
  517         int             p_traceflag;    /* (o) Kernel trace points. */
  518         struct vnode    *p_tracevp;     /* (c + o) Trace to vnode. */
  519         struct ucred    *p_tracecred;   /* (o) Credentials to trace with. */
  520         struct vnode    *p_textvp;      /* (b) Vnode of executable. */
  521         u_int           p_lock;         /* (c) Proclock (prevent swap) count. */
  522         struct sigiolst p_sigiolst;     /* (c) List of sigio sources. */
  523         int             p_sigparent;    /* (c) Signal to parent on exit. */
  524         int             p_sig;          /* (n) For core dump/debugger XXX. */
  525         u_long          p_code;         /* (n) For core dump/debugger XXX. */
  526         u_int           p_stops;        /* (c) Stop event bitmask. */
  527         u_int           p_stype;        /* (c) Stop event type. */
  528         char            p_step;         /* (c) Process is stopped. */
  529         u_char          p_pfsflags;     /* (c) Procfs flags. */
  530         struct nlminfo  *p_nlminfo;     /* (?) Only used by/for lockd. */
  531         struct kaioinfo *p_aioinfo;     /* (y) ASYNC I/O info. */
  532         struct thread   *p_singlethread;/* (c + j) If single threading this is it */
  533         int             p_suspcount;    /* (j) Num threads in suspended mode. */
  534         struct thread   *p_xthread;     /* (c) Trap thread */
  535         int             p_boundary_count;/* (j) Num threads at user boundary */
  536         int             p_pendingcnt;   /* how many signals are pending */
  537         struct itimers  *p_itimers;     /* (c) POSIX interval timers. */
  538         struct procdesc *p_procdesc;    /* (e) Process descriptor, if any. */
  539 /* End area that is zeroed on creation. */
  540 #define p_endzero       p_magic
  541 
  542 /* The following fields are all copied upon creation in fork. */
  543 #define p_startcopy     p_endzero
  544         u_int           p_magic;        /* (b) Magic number. */
  545         int             p_osrel;        /* (x) osreldate for the
  546                                                binary (from ELF note, if any) */
  547         char            p_comm[MAXCOMLEN + 1];  /* (b) Process name. */
  548         struct pgrp     *p_pgrp;        /* (c + e) Pointer to process group. */
  549         struct sysentvec *p_sysent;     /* (b) Syscall dispatch info. */
  550         struct pargs    *p_args;        /* (c) Process arguments. */
  551         rlim_t          p_cpulimit;     /* (c) Current CPU limit in seconds. */
  552         signed char     p_nice;         /* (c) Process "nice" value. */
  553         int             p_fibnum;       /* in this routing domain XXX MRT */
  554 /* End area that is copied on creation. */
  555 #define p_endcopy       p_xstat
  556 
  557         u_short         p_xstat;        /* (c) Exit status; also stop sig. */
  558         struct knlist   p_klist;        /* (c) Knotes attached to this proc. */
  559         int             p_numthreads;   /* (c) Number of threads. */
  560         struct mdproc   p_md;           /* Any machine-dependent fields. */
  561         struct callout  p_itcallout;    /* (h + c) Interval timer callout. */
  562         u_short         p_acflag;       /* (c) Accounting flags. */
  563         struct proc     *p_peers;       /* (r) */
  564         struct proc     *p_leader;      /* (b) */
  565         void            *p_emuldata;    /* (c) Emulator state data. */
  566         struct label    *p_label;       /* (*) Proc (not subject) MAC label. */
  567         struct p_sched  *p_sched;       /* (*) Scheduler-specific data. */
  568         STAILQ_HEAD(, ktr_request)      p_ktr;  /* (o) KTR event queue. */
  569         LIST_HEAD(, mqueue_notifier)    p_mqnotifier; /* (c) mqueue notifiers.*/
  570         struct kdtrace_proc     *p_dtrace; /* (*) DTrace-specific data. */
  571         struct cv       p_pwait;        /* (*) wait cv for exit/exec. */
  572         struct cv       p_dbgwait;      /* (*) wait cv for debugger attach
  573                                            after fork. */
  574         uint64_t        p_prev_runtime; /* (c) Resource usage accounting. */
  575         struct racct    *p_racct;       /* (b) Resource accounting. */
  576 };
  577 
  578 #define p_session       p_pgrp->pg_session
  579 #define p_pgid          p_pgrp->pg_id
  580 
  581 #define NOCPU   0xff            /* For when we aren't on a CPU. */
  582 
  583 #define PROC_SLOCK(p)   mtx_lock_spin(&(p)->p_slock)
  584 #define PROC_SUNLOCK(p) mtx_unlock_spin(&(p)->p_slock)
  585 #define PROC_SLOCK_ASSERT(p, type)      mtx_assert(&(p)->p_slock, (type))
  586 
  587 /* These flags are kept in p_flag. */
  588 #define P_ADVLOCK       0x00001 /* Process may hold a POSIX advisory lock. */
  589 #define P_CONTROLT      0x00002 /* Has a controlling terminal. */
  590 #define P_KTHREAD       0x00004 /* Kernel thread (*). */
  591 #define P_FOLLOWFORK    0x00008 /* Attach parent debugger to children. */
  592 #define P_PPWAIT        0x00010 /* Parent is waiting for child to exec/exit. */
  593 #define P_PROFIL        0x00020 /* Has started profiling. */
  594 #define P_STOPPROF      0x00040 /* Has thread requesting to stop profiling. */
  595 #define P_HADTHREADS    0x00080 /* Has had threads (no cleanup shortcuts) */
  596 #define P_SUGID         0x00100 /* Had set id privileges since last exec. */
  597 #define P_SYSTEM        0x00200 /* System proc: no sigs, stats or swapping. */
  598 #define P_SINGLE_EXIT   0x00400 /* Threads suspending should exit, not wait. */
  599 #define P_TRACED        0x00800 /* Debugged process being traced. */
  600 #define P_WAITED        0x01000 /* Someone is waiting for us. */
  601 #define P_WEXIT         0x02000 /* Working on exiting. */
  602 #define P_EXEC          0x04000 /* Process called exec. */
  603 #define P_WKILLED       0x08000 /* Killed, go to kernel/user boundary ASAP. */
  604 #define P_CONTINUED     0x10000 /* Proc has continued from a stopped state. */
  605 #define P_STOPPED_SIG   0x20000 /* Stopped due to SIGSTOP/SIGTSTP. */
  606 #define P_STOPPED_TRACE 0x40000 /* Stopped because of tracing. */
  607 #define P_STOPPED_SINGLE 0x80000 /* Only 1 thread can continue (not to user). */
  608 #define P_PROTECTED     0x100000 /* Do not kill on memory overcommit. */
  609 #define P_SIGEVENT      0x200000 /* Process pending signals changed. */
  610 #define P_SINGLE_BOUNDARY 0x400000 /* Threads should suspend at user boundary. */
  611 #define P_HWPMC         0x800000 /* Process is using HWPMCs */
  612 
  613 #define P_JAILED        0x1000000 /* Process is in jail. */
  614 #define P_INEXEC        0x4000000 /* Process is in execve(). */
  615 #define P_STATCHILD     0x8000000 /* Child process stopped or exited. */
  616 #define P_INMEM         0x10000000 /* Loaded into memory. */
  617 #define P_SWAPPINGOUT   0x20000000 /* Process is being swapped out. */
  618 #define P_SWAPPINGIN    0x40000000 /* Process is being swapped in. */
  619 
  620 #define P_STOPPED       (P_STOPPED_SIG|P_STOPPED_SINGLE|P_STOPPED_TRACE)
  621 #define P_SHOULDSTOP(p) ((p)->p_flag & P_STOPPED)
  622 #define P_KILLED(p)     ((p)->p_flag & P_WKILLED)
  623 
  624 /*
  625  * These were process status values (p_stat), now they are only used in
  626  * legacy conversion code.
  627  */
  628 #define SIDL    1               /* Process being created by fork. */
  629 #define SRUN    2               /* Currently runnable. */
  630 #define SSLEEP  3               /* Sleeping on an address. */
  631 #define SSTOP   4               /* Process debugging or suspension. */
  632 #define SZOMB   5               /* Awaiting collection by parent. */
  633 #define SWAIT   6               /* Waiting for interrupt. */
  634 #define SLOCK   7               /* Blocked on a lock. */
  635 
  636 #define P_MAGIC         0xbeefface
  637 
  638 #ifdef _KERNEL
  639 
  640 /* Types and flags for mi_switch(). */
  641 #define SW_TYPE_MASK            0xff    /* First 8 bits are switch type */
  642 #define SWT_NONE                0       /* Unspecified switch. */
  643 #define SWT_PREEMPT             1       /* Switching due to preemption. */
  644 #define SWT_OWEPREEMPT          2       /* Switching due to opepreempt. */
  645 #define SWT_TURNSTILE           3       /* Turnstile contention. */
  646 #define SWT_SLEEPQ              4       /* Sleepq wait. */
  647 #define SWT_SLEEPQTIMO          5       /* Sleepq timeout wait. */
  648 #define SWT_RELINQUISH          6       /* yield call. */
  649 #define SWT_NEEDRESCHED         7       /* NEEDRESCHED was set. */
  650 #define SWT_IDLE                8       /* Switching from the idle thread. */
  651 #define SWT_IWAIT               9       /* Waiting for interrupts. */
  652 #define SWT_SUSPEND             10      /* Thread suspended. */
  653 #define SWT_REMOTEPREEMPT       11      /* Remote processor preempted. */
  654 #define SWT_REMOTEWAKEIDLE      12      /* Remote processor preempted idle. */
  655 #define SWT_COUNT               13      /* Number of switch types. */
  656 /* Flags */
  657 #define SW_VOL          0x0100          /* Voluntary switch. */
  658 #define SW_INVOL        0x0200          /* Involuntary switch. */
  659 #define SW_PREEMPT      0x0400          /* The invol switch is a preemption */
  660 
  661 /* How values for thread_single(). */
  662 #define SINGLE_NO_EXIT  0
  663 #define SINGLE_EXIT     1
  664 #define SINGLE_BOUNDARY 2
  665 
  666 #ifdef MALLOC_DECLARE
  667 MALLOC_DECLARE(M_PARGS);
  668 MALLOC_DECLARE(M_PGRP);
  669 MALLOC_DECLARE(M_SESSION);
  670 MALLOC_DECLARE(M_SUBPROC);
  671 #endif
  672 
  673 #define FOREACH_PROC_IN_SYSTEM(p)                                       \
  674         LIST_FOREACH((p), &allproc, p_list)
  675 #define FOREACH_THREAD_IN_PROC(p, td)                                   \
  676         TAILQ_FOREACH((td), &(p)->p_threads, td_plist)
  677 
  678 #define FIRST_THREAD_IN_PROC(p) TAILQ_FIRST(&(p)->p_threads)
  679 
  680 /*
  681  * We use process IDs <= PID_MAX; PID_MAX + 1 must also fit in a pid_t,
  682  * as it is used to represent "no process group".
  683  */
  684 #define PID_MAX         99999
  685 #define NO_PID          100000
  686 
  687 #define SESS_LEADER(p)  ((p)->p_session->s_leader == (p))
  688 
  689 
  690 #define STOPEVENT(p, e, v) do {                                         \
  691         if ((p)->p_stops & (e)) {                                       \
  692                 PROC_LOCK(p);                                           \
  693                 stopevent((p), (e), (v));                               \
  694                 PROC_UNLOCK(p);                                         \
  695         }                                                               \
  696 } while (0)
  697 #define _STOPEVENT(p, e, v) do {                                        \
  698         PROC_LOCK_ASSERT(p, MA_OWNED);                                  \
  699         WITNESS_WARN(WARN_GIANTOK | WARN_SLEEPOK, &p->p_mtx.lock_object, \
  700             "checking stopevent %d", (e));                              \
  701         if ((p)->p_stops & (e))                                         \
  702                 stopevent((p), (e), (v));                               \
  703 } while (0)
  704 
  705 /* Lock and unlock a process. */
  706 #define PROC_LOCK(p)    mtx_lock(&(p)->p_mtx)
  707 #define PROC_TRYLOCK(p) mtx_trylock(&(p)->p_mtx)
  708 #define PROC_UNLOCK(p)  mtx_unlock(&(p)->p_mtx)
  709 #define PROC_LOCKED(p)  mtx_owned(&(p)->p_mtx)
  710 #define PROC_LOCK_ASSERT(p, type)       mtx_assert(&(p)->p_mtx, (type))
  711 
  712 /* Lock and unlock a process group. */
  713 #define PGRP_LOCK(pg)   mtx_lock(&(pg)->pg_mtx)
  714 #define PGRP_UNLOCK(pg) mtx_unlock(&(pg)->pg_mtx)
  715 #define PGRP_LOCKED(pg) mtx_owned(&(pg)->pg_mtx)
  716 #define PGRP_LOCK_ASSERT(pg, type)      mtx_assert(&(pg)->pg_mtx, (type))
  717 
  718 #define PGRP_LOCK_PGSIGNAL(pg) do {                                     \
  719         if ((pg) != NULL)                                               \
  720                 PGRP_LOCK(pg);                                          \
  721 } while (0)
  722 #define PGRP_UNLOCK_PGSIGNAL(pg) do {                                   \
  723         if ((pg) != NULL)                                               \
  724                 PGRP_UNLOCK(pg);                                        \
  725 } while (0)
  726 
  727 /* Lock and unlock a session. */
  728 #define SESS_LOCK(s)    mtx_lock(&(s)->s_mtx)
  729 #define SESS_UNLOCK(s)  mtx_unlock(&(s)->s_mtx)
  730 #define SESS_LOCKED(s)  mtx_owned(&(s)->s_mtx)
  731 #define SESS_LOCK_ASSERT(s, type)       mtx_assert(&(s)->s_mtx, (type))
  732 
  733 /* Hold process U-area in memory, normally for ptrace/procfs work. */
  734 #define PHOLD(p) do {                                                   \
  735         PROC_LOCK(p);                                                   \
  736         _PHOLD(p);                                                      \
  737         PROC_UNLOCK(p);                                                 \
  738 } while (0)
  739 #define _PHOLD(p) do {                                                  \
  740         PROC_LOCK_ASSERT((p), MA_OWNED);                                \
  741         KASSERT(!((p)->p_flag & P_WEXIT) || (p) == curproc,             \
  742             ("PHOLD of exiting process"));                              \
  743         (p)->p_lock++;                                                  \
  744         if (((p)->p_flag & P_INMEM) == 0)                               \
  745                 faultin((p));                                           \
  746 } while (0)
  747 #define PROC_ASSERT_HELD(p) do {                                        \
  748         KASSERT((p)->p_lock > 0, ("process not held"));                 \
  749 } while (0)
  750 
  751 #define PRELE(p) do {                                                   \
  752         PROC_LOCK((p));                                                 \
  753         _PRELE((p));                                                    \
  754         PROC_UNLOCK((p));                                               \
  755 } while (0)
  756 #define _PRELE(p) do {                                                  \
  757         PROC_LOCK_ASSERT((p), MA_OWNED);                                \
  758         (--(p)->p_lock);                                                \
  759         if (((p)->p_flag & P_WEXIT) && (p)->p_lock == 0)                \
  760                 wakeup(&(p)->p_lock);                                   \
  761 } while (0)
  762 #define PROC_ASSERT_NOT_HELD(p) do {                                    \
  763         KASSERT((p)->p_lock == 0, ("process held"));                    \
  764 } while (0)
  765 
  766 /* Check whether a thread is safe to be swapped out. */
  767 #define thread_safetoswapout(td)        ((td)->td_flags & TDF_CANSWAP)
  768 
  769 /* Control whether or not it is safe for curthread to sleep. */
  770 #define THREAD_NO_SLEEPING() do {                                       \
  771         KASSERT(!(curthread->td_pflags & TDP_NOSLEEPING),               \
  772             ("nested no sleeping"));                                    \
  773         curthread->td_pflags |= TDP_NOSLEEPING;                         \
  774 } while (0)
  775 
  776 #define THREAD_SLEEPING_OK() do {                                       \
  777         KASSERT((curthread->td_pflags & TDP_NOSLEEPING),                \
  778             ("nested sleeping ok"));                                    \
  779         curthread->td_pflags &= ~TDP_NOSLEEPING;                        \
  780 } while (0)
  781 
  782 #define PIDHASH(pid)    (&pidhashtbl[(pid) & pidhash])
  783 extern LIST_HEAD(pidhashhead, proc) *pidhashtbl;
  784 extern u_long pidhash;
  785 #define TIDHASH(tid)    (&tidhashtbl[(tid) & tidhash])
  786 extern LIST_HEAD(tidhashhead, thread) *tidhashtbl;
  787 extern u_long tidhash;
  788 extern struct rwlock tidhash_lock;
  789 
  790 #define PGRPHASH(pgid)  (&pgrphashtbl[(pgid) & pgrphash])
  791 extern LIST_HEAD(pgrphashhead, pgrp) *pgrphashtbl;
  792 extern u_long pgrphash;
  793 
  794 extern struct sx allproc_lock;
  795 extern struct sx proctree_lock;
  796 extern struct mtx ppeers_lock;
  797 extern struct proc proc0;               /* Process slot for swapper. */
  798 extern struct thread thread0;           /* Primary thread in proc0. */
  799 extern struct vmspace vmspace0;         /* VM space for proc0. */
  800 extern int hogticks;                    /* Limit on kernel cpu hogs. */
  801 extern int lastpid;
  802 extern int nprocs, maxproc;             /* Current and max number of procs. */
  803 extern int maxprocperuid;               /* Max procs per uid. */
  804 extern u_long ps_arg_cache_limit;
  805 
  806 LIST_HEAD(proclist, proc);
  807 TAILQ_HEAD(procqueue, proc);
  808 TAILQ_HEAD(threadqueue, thread);
  809 extern struct proclist allproc;         /* List of all processes. */
  810 extern struct proclist zombproc;        /* List of zombie processes. */
  811 extern struct proc *initproc, *pageproc; /* Process slots for init, pager. */
  812 
  813 extern struct uma_zone *proc_zone;
  814 
  815 struct  proc *pfind(pid_t);             /* Find process by id. */
  816 struct  pgrp *pgfind(pid_t);            /* Find process group by id. */
  817 struct  proc *zpfind(pid_t);            /* Find zombie process by id. */
  818 
  819 void    ast(struct trapframe *framep);
  820 struct  thread *choosethread(void);
  821 int     cr_cansignal(struct ucred *cred, struct proc *proc, int signum);
  822 int     enterpgrp(struct proc *p, pid_t pgid, struct pgrp *pgrp,
  823             struct session *sess);
  824 int     enterthispgrp(struct proc *p, struct pgrp *pgrp);
  825 void    faultin(struct proc *p);
  826 void    fixjobc(struct proc *p, struct pgrp *pgrp, int entering);
  827 int     fork1(struct thread *, int, int, struct proc **, int *, int);
  828 void    fork_exit(void (*)(void *, struct trapframe *), void *,
  829             struct trapframe *);
  830 void    fork_return(struct thread *, struct trapframe *);
  831 int     inferior(struct proc *p);
  832 void    kern_yield(int);
  833 void    kick_proc0(void);
  834 int     leavepgrp(struct proc *p);
  835 int     maybe_preempt(struct thread *td);
  836 void    maybe_yield(void);
  837 void    mi_switch(int flags, struct thread *newtd);
  838 int     p_candebug(struct thread *td, struct proc *p);
  839 int     p_cansee(struct thread *td, struct proc *p);
  840 int     p_cansched(struct thread *td, struct proc *p);
  841 int     p_cansignal(struct thread *td, struct proc *p, int signum);
  842 int     p_canwait(struct thread *td, struct proc *p);
  843 struct  pargs *pargs_alloc(int len);
  844 void    pargs_drop(struct pargs *pa);
  845 void    pargs_hold(struct pargs *pa);
  846 void    procinit(void);
  847 void    proc_linkup0(struct proc *p, struct thread *td);
  848 void    proc_linkup(struct proc *p, struct thread *td);
  849 void    proc_reap(struct thread *td, struct proc *p, int *status, int options,
  850             struct rusage *rusage);
  851 void    proc_reparent(struct proc *child, struct proc *newparent);
  852 struct  pstats *pstats_alloc(void);
  853 void    pstats_fork(struct pstats *src, struct pstats *dst);
  854 void    pstats_free(struct pstats *ps);
  855 int     securelevel_ge(struct ucred *cr, int level);
  856 int     securelevel_gt(struct ucred *cr, int level);
  857 void    sess_hold(struct session *);
  858 void    sess_release(struct session *);
  859 int     setrunnable(struct thread *);
  860 void    setsugid(struct proc *p);
  861 int     should_yield(void);
  862 int     sigonstack(size_t sp);
  863 void    sleepinit(void);
  864 void    stopevent(struct proc *, u_int, u_int);
  865 struct  thread *tdfind(lwpid_t, pid_t);
  866 void    threadinit(void);
  867 void    tidhash_add(struct thread *);
  868 void    tidhash_remove(struct thread *);
  869 void    cpu_idle(int);
  870 int     cpu_idle_wakeup(int);
  871 extern  void (*cpu_idle_hook)(void);    /* Hook to machdep CPU idler. */
  872 void    cpu_switch(struct thread *, struct thread *, struct mtx *);
  873 void    cpu_throw(struct thread *, struct thread *) __dead2;
  874 void    unsleep(struct thread *);
  875 void    userret(struct thread *, struct trapframe *);
  876 
  877 void    cpu_exit(struct thread *);
  878 void    exit1(struct thread *, int) __dead2;
  879 struct syscall_args;
  880 int     cpu_fetch_syscall_args(struct thread *td, struct syscall_args *sa);
  881 void    cpu_fork(struct thread *, struct proc *, struct thread *, int);
  882 void    cpu_set_fork_handler(struct thread *, void (*)(void *), void *);
  883 void    cpu_set_syscall_retval(struct thread *, int);
  884 void    cpu_set_upcall(struct thread *td, struct thread *td0);
  885 void    cpu_set_upcall_kse(struct thread *, void (*)(void *), void *,
  886             stack_t *);
  887 int     cpu_set_user_tls(struct thread *, void *tls_base);
  888 void    cpu_thread_alloc(struct thread *);
  889 void    cpu_thread_clean(struct thread *);
  890 void    cpu_thread_exit(struct thread *);
  891 void    cpu_thread_free(struct thread *);
  892 void    cpu_thread_swapin(struct thread *);
  893 void    cpu_thread_swapout(struct thread *);
  894 struct  thread *thread_alloc(int pages);
  895 int     thread_alloc_stack(struct thread *, int pages);
  896 void    thread_exit(void) __dead2;
  897 void    thread_free(struct thread *td);
  898 void    thread_link(struct thread *td, struct proc *p);
  899 void    thread_reap(void);
  900 int     thread_single(int how);
  901 void    thread_single_end(void);
  902 void    thread_stash(struct thread *td);
  903 void    thread_stopped(struct proc *p);
  904 void    childproc_stopped(struct proc *child, int reason);
  905 void    childproc_continued(struct proc *child);
  906 void    childproc_exited(struct proc *child);
  907 int     thread_suspend_check(int how);
  908 void    thread_suspend_switch(struct thread *);
  909 void    thread_suspend_one(struct thread *td);
  910 void    thread_unlink(struct thread *td);
  911 void    thread_unsuspend(struct proc *p);
  912 int     thread_unsuspend_one(struct thread *td);
  913 void    thread_unthread(struct thread *td);
  914 void    thread_wait(struct proc *p);
  915 struct thread   *thread_find(struct proc *p, lwpid_t tid);
  916 
  917 static __inline int
  918 curthread_pflags_set(int flags)
  919 {
  920         struct thread *td;
  921         int save;
  922 
  923         td = curthread;
  924         save = ~flags | (td->td_pflags & flags);
  925         td->td_pflags |= flags;
  926         return (save);
  927 }
  928 
  929 static __inline void
  930 curthread_pflags_restore(int save)
  931 {
  932 
  933         curthread->td_pflags &= save;
  934 }
  935 
  936 #endif  /* _KERNEL */
  937 
  938 #endif  /* !_SYS_PROC_H_ */

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