The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: 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/11.1/sys/sys/proc.h 318743 2017-05-23 12:40:50Z badger $
   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 <sys/_vm_domain.h>
   67 #include <machine/proc.h>               /* Machine-dependent proc substruct. */
   68 
   69 /*
   70  * One structure allocated per session.
   71  *
   72  * List of locks
   73  * (m)          locked by s_mtx mtx
   74  * (e)          locked by proctree_lock sx
   75  * (c)          const until freeing
   76  */
   77 struct session {
   78         u_int           s_count;        /* Ref cnt; pgrps in session - atomic. */
   79         struct proc     *s_leader;      /* (m + e) Session leader. */
   80         struct vnode    *s_ttyvp;       /* (m) Vnode of controlling tty. */
   81         struct cdev_priv *s_ttydp;      /* (m) Device of controlling tty.  */
   82         struct tty      *s_ttyp;        /* (e) Controlling tty. */
   83         pid_t           s_sid;          /* (c) Session ID. */
   84                                         /* (m) Setlogin() name: */
   85         char            s_login[roundup(MAXLOGNAME, sizeof(long))];
   86         struct mtx      s_mtx;          /* Mutex to protect members. */
   87 };
   88 
   89 /*
   90  * One structure allocated per process group.
   91  *
   92  * List of locks
   93  * (m)          locked by pg_mtx mtx
   94  * (e)          locked by proctree_lock sx
   95  * (c)          const until freeing
   96  */
   97 struct pgrp {
   98         LIST_ENTRY(pgrp) pg_hash;       /* (e) Hash chain. */
   99         LIST_HEAD(, proc) pg_members;   /* (m + e) Pointer to pgrp members. */
  100         struct session  *pg_session;    /* (c) Pointer to session. */
  101         struct sigiolst pg_sigiolst;    /* (m) List of sigio sources. */
  102         pid_t           pg_id;          /* (c) Process group id. */
  103         int             pg_jobc;        /* (m) Job control process count. */
  104         struct mtx      pg_mtx;         /* Mutex to protect members */
  105 };
  106 
  107 /*
  108  * pargs, used to hold a copy of the command line, if it had a sane length.
  109  */
  110 struct pargs {
  111         u_int   ar_ref;         /* Reference count. */
  112         u_int   ar_length;      /* Length. */
  113         u_char  ar_args[1];     /* Arguments. */
  114 };
  115 
  116 /*-
  117  * Description of a process.
  118  *
  119  * This structure contains the information needed to manage a thread of
  120  * control, known in UN*X as a process; it has references to substructures
  121  * containing descriptions of things that the process uses, but may share
  122  * with related processes.  The process structure and the substructures
  123  * are always addressable except for those marked "(CPU)" below,
  124  * which might be addressable only on a processor on which the process
  125  * is running.
  126  *
  127  * Below is a key of locks used to protect each member of struct proc.  The
  128  * lock is indicated by a reference to a specific character in parens in the
  129  * associated comment.
  130  *      * - not yet protected
  131  *      a - only touched by curproc or parent during fork/wait
  132  *      b - created at fork, never changes
  133  *              (exception aiods switch vmspaces, but they are also
  134  *              marked 'P_SYSTEM' so hopefully it will be left alone)
  135  *      c - locked by proc mtx
  136  *      d - locked by allproc_lock lock
  137  *      e - locked by proctree_lock lock
  138  *      f - session mtx
  139  *      g - process group mtx
  140  *      h - callout_lock mtx
  141  *      i - by curproc or the master session mtx
  142  *      j - locked by proc slock
  143  *      k - only accessed by curthread
  144  *      k*- only accessed by curthread and from an interrupt
  145  *      l - the attaching proc or attaching proc parent
  146  *      m - Giant
  147  *      n - not locked, lazy
  148  *      o - ktrace lock
  149  *      q - td_contested lock
  150  *      r - p_peers lock
  151  *      s - see sleepq_switch(), sleeping_on_old_rtc(), and sleep(9)
  152  *      t - thread lock
  153  *      u - process stat lock
  154  *      w - process timer lock
  155  *      x - created at fork, only changes during single threading in exec
  156  *      y - created at first aio, doesn't change until exit or exec at which
  157  *          point we are single-threaded and only curthread changes it
  158  *      z - zombie threads lock
  159  *
  160  * If the locking key specifies two identifiers (for example, p_pptr) then
  161  * either lock is sufficient for read access, but both locks must be held
  162  * for write access.
  163  */
  164 struct cpuset;
  165 struct filecaps;
  166 struct filemon;
  167 struct kaioinfo;
  168 struct kaudit_record;
  169 struct kdtrace_proc;
  170 struct kdtrace_thread;
  171 struct mqueue_notifier;
  172 struct nlminfo;
  173 struct p_sched;
  174 struct proc;
  175 struct procdesc;
  176 struct racct;
  177 struct sbuf;
  178 struct sleepqueue;
  179 struct syscall_args;
  180 struct td_sched;
  181 struct thread;
  182 struct trapframe;
  183 struct turnstile;
  184 
  185 /*
  186  * XXX: Does this belong in resource.h or resourcevar.h instead?
  187  * Resource usage extension.  The times in rusage structs in the kernel are
  188  * never up to date.  The actual times are kept as runtimes and tick counts
  189  * (with control info in the "previous" times), and are converted when
  190  * userland asks for rusage info.  Backwards compatibility prevents putting
  191  * this directly in the user-visible rusage struct.
  192  *
  193  * Locking for p_rux: (cu) means (u) for p_rux and (c) for p_crux.
  194  * Locking for td_rux: (t) for all fields.
  195  */
  196 struct rusage_ext {
  197         uint64_t        rux_runtime;    /* (cu) Real time. */
  198         uint64_t        rux_uticks;     /* (cu) Statclock hits in user mode. */
  199         uint64_t        rux_sticks;     /* (cu) Statclock hits in sys mode. */
  200         uint64_t        rux_iticks;     /* (cu) Statclock hits in intr mode. */
  201         uint64_t        rux_uu;         /* (c) Previous user time in usec. */
  202         uint64_t        rux_su;         /* (c) Previous sys time in usec. */
  203         uint64_t        rux_tu;         /* (c) Previous total time in usec. */
  204 };
  205 
  206 /*
  207  * Kernel runnable context (thread).
  208  * This is what is put to sleep and reactivated.
  209  * Thread context.  Processes may have multiple threads.
  210  */
  211 struct thread {
  212         struct mtx      *volatile td_lock; /* replaces sched lock */
  213         struct proc     *td_proc;       /* (*) Associated process. */
  214         TAILQ_ENTRY(thread) td_plist;   /* (*) All threads in this proc. */
  215         TAILQ_ENTRY(thread) td_runq;    /* (t) Run queue. */
  216         TAILQ_ENTRY(thread) td_slpq;    /* (t) Sleep queue. */
  217         TAILQ_ENTRY(thread) td_lockq;   /* (t) Lock queue. */
  218         LIST_ENTRY(thread) td_hash;     /* (d) Hash chain. */
  219         struct cpuset   *td_cpuset;     /* (t) CPU affinity mask. */
  220         struct seltd    *td_sel;        /* Select queue/channel. */
  221         struct sleepqueue *td_sleepqueue; /* (k) Associated sleep queue. */
  222         struct turnstile *td_turnstile; /* (k) Associated turnstile. */
  223         struct rl_q_entry *td_rlqe;     /* (k) Associated range lock entry. */
  224         struct umtx_q   *td_umtxq;      /* (c?) Link for when we're blocked. */
  225         struct vm_domain_policy td_vm_dom_policy;       /* (c) current numa domain policy */
  226         lwpid_t         td_tid;         /* (b) Thread ID. */
  227         uint64_t        padding1[4];
  228         void            *padding2[4];
  229         u_char          td_lend_user_pri; /* (t) Lend user pri. */
  230 
  231 /* Cleared during fork1() */
  232 #define td_startzero td_flags
  233         int             td_flags;       /* (t) TDF_* flags. */
  234         int             td_inhibitors;  /* (t) Why can not run. */
  235         int             td_pflags;      /* (k) Private thread (TDP_*) flags. */
  236         int             td_dupfd;       /* (k) Ret value from fdopen. XXX */
  237         int             td_sqqueue;     /* (t) Sleepqueue queue blocked on. */
  238         void            *td_wchan;      /* (t) Sleep address. */
  239         const char      *td_wmesg;      /* (t) Reason for sleep. */
  240         volatile u_char td_owepreempt;  /* (k*) Preempt on last critical_exit */
  241         u_char          td_tsqueue;     /* (t) Turnstile queue blocked on. */
  242         short           td_locks;       /* (k) Debug: count of non-spin locks */
  243         short           td_rw_rlocks;   /* (k) Count of rwlock read locks. */
  244         short           td_lk_slocks;   /* (k) Count of lockmgr shared locks. */
  245         short           td_stopsched;   /* (k) Scheduler stopped. */
  246         struct turnstile *td_blocked;   /* (t) Lock thread is blocked on. */
  247         const char      *td_lockname;   /* (t) Name of lock blocked on. */
  248         LIST_HEAD(, turnstile) td_contested;    /* (q) Contested locks. */
  249         struct lock_list_entry *td_sleeplocks; /* (k) Held sleep locks. */
  250         int             td_intr_nesting_level; /* (k) Interrupt recursion. */
  251         int             td_pinned;      /* (k) Temporary cpu pin count. */
  252         struct ucred    *td_ucred;      /* (k) Reference to credentials. */
  253         struct plimit   *td_limit;      /* (k) Resource limits. */
  254         int             td_slptick;     /* (t) Time at sleep. */
  255         int             td_blktick;     /* (t) Time spent blocked. */
  256         int             td_swvoltick;   /* (t) Time at last SW_VOL switch. */
  257         int             td_swinvoltick; /* (t) Time at last SW_INVOL switch. */
  258         u_int           td_cow;         /* (*) Number of copy-on-write faults */
  259         struct rusage   td_ru;          /* (t) rusage information. */
  260         struct rusage_ext td_rux;       /* (t) Internal rusage information. */
  261         uint64_t        td_incruntime;  /* (t) Cpu ticks to transfer to proc. */
  262         uint64_t        td_runtime;     /* (t) How many cpu ticks we've run. */
  263         u_int           td_pticks;      /* (t) Statclock hits for profiling */
  264         u_int           td_sticks;      /* (t) Statclock hits in system mode. */
  265         u_int           td_iticks;      /* (t) Statclock hits in intr mode. */
  266         u_int           td_uticks;      /* (t) Statclock hits in user mode. */
  267         int             td_intrval;     /* (t) Return value for sleepq. */
  268         sigset_t        td_oldsigmask;  /* (k) Saved mask from pre sigpause. */
  269         volatile u_int  td_generation;  /* (k) For detection of preemption */
  270         stack_t         td_sigstk;      /* (k) Stack ptr and on-stack flag. */
  271         int             td_xsig;        /* (c) Signal for ptrace */
  272         u_long          td_profil_addr; /* (k) Temporary addr until AST. */
  273         u_int           td_profil_ticks; /* (k) Temporary ticks until AST. */
  274         char            td_name[MAXCOMLEN + 1]; /* (*) Thread name. */
  275         struct file     *td_fpop;       /* (k) file referencing cdev under op */
  276         int             td_dbgflags;    /* (c) Userland debugger flags */
  277         struct ksiginfo td_dbgksi;      /* (c) ksi reflected to debugger. */
  278         int             td_ng_outbound; /* (k) Thread entered ng from above. */
  279         struct osd      td_osd;         /* (k) Object specific data. */
  280         struct vm_map_entry *td_map_def_user; /* (k) Deferred entries. */
  281         pid_t           td_dbg_forked;  /* (c) Child pid for debugger. */
  282         u_int           td_vp_reserv;   /* (k) Count of reserved vnodes. */
  283         int             td_no_sleeping; /* (k) Sleeping disabled count. */
  284         int             td_dom_rr_idx;  /* (k) RR Numa domain selection. */
  285         void            *td_su;         /* (k) FFS SU private */
  286         int             td_rtcgen;      /* (s) rtc_generation of abs. sleep */
  287 #define td_endzero td_sigmask
  288 
  289 /* Copied during fork1() or create_thread(). */
  290 #define td_startcopy td_endzero
  291         sigset_t        td_sigmask;     /* (c) Current signal mask. */
  292         u_char          td_rqindex;     /* (t) Run queue index. */
  293         u_char          td_base_pri;    /* (t) Thread base kernel priority. */
  294         u_char          td_priority;    /* (t) Thread active priority. */
  295         u_char          td_pri_class;   /* (t) Scheduling class. */
  296         u_char          td_user_pri;    /* (t) User pri from estcpu and nice. */
  297         u_char          td_base_user_pri; /* (t) Base user pri */
  298         u_int           td_dbg_sc_code; /* (c) Syscall code to debugger. */
  299         u_int           td_dbg_sc_narg; /* (c) Syscall arg count to debugger.*/
  300         uintptr_t       td_rb_list;     /* (k) Robust list head. */
  301         uintptr_t       td_rbp_list;    /* (k) Robust priv list head. */
  302         uintptr_t       td_rb_inact;    /* (k) Current in-action mutex loc. */
  303 #define td_endcopy td_pcb
  304 
  305 /*
  306  * Fields that must be manually set in fork1() or create_thread()
  307  * or already have been set in the allocator, constructor, etc.
  308  */
  309         struct pcb      *td_pcb;        /* (k) Kernel VA of pcb and kstack. */
  310         enum {
  311                 TDS_INACTIVE = 0x0,
  312                 TDS_INHIBITED,
  313                 TDS_CAN_RUN,
  314                 TDS_RUNQ,
  315                 TDS_RUNNING
  316         } td_state;                     /* (t) thread state */
  317         union {
  318                 register_t      tdu_retval[2];
  319                 off_t           tdu_off;
  320         } td_uretoff;                   /* (k) Syscall aux returns. */
  321 #define td_retval       td_uretoff.tdu_retval
  322         u_int           td_cowgen;      /* (k) Generation of COW pointers. */
  323         struct callout  td_slpcallout;  /* (h) Callout for sleep. */
  324         struct trapframe *td_frame;     /* (k) */
  325         struct vm_object *td_kstack_obj;/* (a) Kstack object. */
  326         vm_offset_t     td_kstack;      /* (a) Kernel VA of kstack. */
  327         int             td_kstack_pages; /* (a) Size of the kstack. */
  328         volatile u_int  td_critnest;    /* (k*) Critical section nest level. */
  329         struct mdthread td_md;          /* (k) Any machine-dependent fields. */
  330         struct kaudit_record    *td_ar; /* (k) Active audit record, if any. */
  331         struct lpohead  td_lprof[2];    /* (a) lock profiling objects. */
  332         struct kdtrace_thread   *td_dtrace; /* (*) DTrace-specific data. */
  333         int             td_errno;       /* Error returned by last syscall. */
  334         struct vnet     *td_vnet;       /* (k) Effective vnet. */
  335         const char      *td_vnet_lpush; /* (k) Debugging vnet push / pop. */
  336         struct trapframe *td_intr_frame;/* (k) Frame of the current irq */
  337         struct proc     *td_rfppwait_p; /* (k) The vforked child */
  338         struct vm_page  **td_ma;        /* (k) uio pages held */
  339         int             td_ma_cnt;      /* (k) size of *td_ma */
  340         void            *td_emuldata;   /* Emulator state data */
  341         int             td_lastcpu;     /* (t) Last cpu we were on. */
  342         int             td_oncpu;       /* (t) Which cpu we are on. */
  343         sbintime_t      td_sleeptimo;   /* (t) Sleep timeout. */
  344         sigqueue_t      td_sigqueue;    /* (c) Sigs arrived, not delivered. */
  345 #define td_siglist      td_sigqueue.sq_signals
  346 };
  347 
  348 struct thread0_storage {
  349         struct thread t0st_thread;
  350         uint64_t t0st_sched[10];
  351 };
  352 
  353 struct mtx *thread_lock_block(struct thread *);
  354 void thread_lock_unblock(struct thread *, struct mtx *);
  355 void thread_lock_set(struct thread *, struct mtx *);
  356 #define THREAD_LOCK_ASSERT(td, type)                                    \
  357 do {                                                                    \
  358         struct mtx *__m = (td)->td_lock;                                \
  359         if (__m != &blocked_lock)                                       \
  360                 mtx_assert(__m, (type));                                \
  361 } while (0)
  362 
  363 #ifdef INVARIANTS
  364 #define THREAD_LOCKPTR_ASSERT(td, lock)                                 \
  365 do {                                                                    \
  366         struct mtx *__m = (td)->td_lock;                                \
  367         KASSERT((__m == &blocked_lock || __m == (lock)),                \
  368             ("Thread %p lock %p does not match %p", td, __m, (lock)));  \
  369 } while (0)
  370 
  371 #define TD_LOCKS_INC(td)        ((td)->td_locks++)
  372 #define TD_LOCKS_DEC(td)        ((td)->td_locks--)
  373 #else
  374 #define THREAD_LOCKPTR_ASSERT(td, lock)
  375 
  376 #define TD_LOCKS_INC(td)
  377 #define TD_LOCKS_DEC(td)
  378 #endif
  379 
  380 /*
  381  * Flags kept in td_flags:
  382  * To change these you MUST have the scheduler lock.
  383  */
  384 #define TDF_BORROWING   0x00000001 /* Thread is borrowing pri from another. */
  385 #define TDF_INPANIC     0x00000002 /* Caused a panic, let it drive crashdump. */
  386 #define TDF_INMEM       0x00000004 /* Thread's stack is in memory. */
  387 #define TDF_SINTR       0x00000008 /* Sleep is interruptible. */
  388 #define TDF_TIMEOUT     0x00000010 /* Timing out during sleep. */
  389 #define TDF_IDLETD      0x00000020 /* This is a per-CPU idle thread. */
  390 #define TDF_CANSWAP     0x00000040 /* Thread can be swapped. */
  391 #define TDF_SLEEPABORT  0x00000080 /* sleepq_abort was called. */
  392 #define TDF_KTH_SUSP    0x00000100 /* kthread is suspended */
  393 #define TDF_ALLPROCSUSP 0x00000200 /* suspended by SINGLE_ALLPROC */
  394 #define TDF_BOUNDARY    0x00000400 /* Thread suspended at user boundary */
  395 #define TDF_ASTPENDING  0x00000800 /* Thread has some asynchronous events. */
  396 #define TDF_UNUSED12    0x00001000 /* --available-- */
  397 #define TDF_SBDRY       0x00002000 /* Stop only on usermode boundary. */
  398 #define TDF_UPIBLOCKED  0x00004000 /* Thread blocked on user PI mutex. */
  399 #define TDF_NEEDSUSPCHK 0x00008000 /* Thread may need to suspend. */
  400 #define TDF_NEEDRESCHED 0x00010000 /* Thread needs to yield. */
  401 #define TDF_NEEDSIGCHK  0x00020000 /* Thread may need signal delivery. */
  402 #define TDF_NOLOAD      0x00040000 /* Ignore during load avg calculations. */
  403 #define TDF_SERESTART   0x00080000 /* ERESTART on stop attempts. */
  404 #define TDF_THRWAKEUP   0x00100000 /* Libthr thread must not suspend itself. */
  405 #define TDF_SEINTR      0x00200000 /* EINTR on stop attempts. */
  406 #define TDF_SWAPINREQ   0x00400000 /* Swapin request due to wakeup. */
  407 #define TDF_UNUSED23    0x00800000 /* --available-- */
  408 #define TDF_SCHED0      0x01000000 /* Reserved for scheduler private use */
  409 #define TDF_SCHED1      0x02000000 /* Reserved for scheduler private use */
  410 #define TDF_SCHED2      0x04000000 /* Reserved for scheduler private use */
  411 #define TDF_SCHED3      0x08000000 /* Reserved for scheduler private use */
  412 #define TDF_ALRMPEND    0x10000000 /* Pending SIGVTALRM needs to be posted. */
  413 #define TDF_PROFPEND    0x20000000 /* Pending SIGPROF needs to be posted. */
  414 #define TDF_MACPEND     0x40000000 /* AST-based MAC event pending. */
  415 
  416 /* Userland debug flags */
  417 #define TDB_SUSPEND     0x00000001 /* Thread is suspended by debugger */
  418 #define TDB_XSIG        0x00000002 /* Thread is exchanging signal under trace */
  419 #define TDB_USERWR      0x00000004 /* Debugger modified memory or registers */
  420 #define TDB_SCE         0x00000008 /* Thread performs syscall enter */
  421 #define TDB_SCX         0x00000010 /* Thread performs syscall exit */
  422 #define TDB_EXEC        0x00000020 /* TDB_SCX from exec(2) family */
  423 #define TDB_FORK        0x00000040 /* TDB_SCX from fork(2) that created new
  424                                       process */
  425 #define TDB_STOPATFORK  0x00000080 /* Stop at the return from fork (child
  426                                       only) */
  427 #define TDB_CHILD       0x00000100 /* New child indicator for ptrace() */
  428 #define TDB_BORN        0x00000200 /* New LWP indicator for ptrace() */
  429 #define TDB_EXIT        0x00000400 /* Exiting LWP indicator for ptrace() */
  430 #define TDB_VFORK       0x00000800 /* vfork indicator for ptrace() */
  431 #define TDB_FSTP        0x00001000 /* The thread is PT_ATTACH leader */
  432 
  433 /*
  434  * "Private" flags kept in td_pflags:
  435  * These are only written by curthread and thus need no locking.
  436  */
  437 #define TDP_OLDMASK     0x00000001 /* Need to restore mask after suspend. */
  438 #define TDP_INKTR       0x00000002 /* Thread is currently in KTR code. */
  439 #define TDP_INKTRACE    0x00000004 /* Thread is currently in KTRACE code. */
  440 #define TDP_BUFNEED     0x00000008 /* Do not recurse into the buf flush */
  441 #define TDP_COWINPROGRESS 0x00000010 /* Snapshot copy-on-write in progress. */
  442 #define TDP_ALTSTACK    0x00000020 /* Have alternate signal stack. */
  443 #define TDP_DEADLKTREAT 0x00000040 /* Lock acquisition - deadlock treatment. */
  444 #define TDP_NOFAULTING  0x00000080 /* Do not handle page faults. */
  445 #define TDP_UNUSED9     0x00000100 /* --available-- */
  446 #define TDP_OWEUPC      0x00000200 /* Call addupc() at next AST. */
  447 #define TDP_ITHREAD     0x00000400 /* Thread is an interrupt thread. */
  448 #define TDP_SYNCIO      0x00000800 /* Local override, disable async i/o. */
  449 #define TDP_SCHED1      0x00001000 /* Reserved for scheduler private use */
  450 #define TDP_SCHED2      0x00002000 /* Reserved for scheduler private use */
  451 #define TDP_SCHED3      0x00004000 /* Reserved for scheduler private use */
  452 #define TDP_SCHED4      0x00008000 /* Reserved for scheduler private use */
  453 #define TDP_GEOM        0x00010000 /* Settle GEOM before finishing syscall */
  454 #define TDP_SOFTDEP     0x00020000 /* Stuck processing softdep worklist */
  455 #define TDP_NORUNNINGBUF 0x00040000 /* Ignore runningbufspace check */
  456 #define TDP_WAKEUP      0x00080000 /* Don't sleep in umtx cond_wait */
  457 #define TDP_INBDFLUSH   0x00100000 /* Already in BO_BDFLUSH, do not recurse */
  458 #define TDP_KTHREAD     0x00200000 /* This is an official kernel thread */
  459 #define TDP_CALLCHAIN   0x00400000 /* Capture thread's callchain */
  460 #define TDP_IGNSUSP     0x00800000 /* Permission to ignore the MNTK_SUSPEND* */
  461 #define TDP_AUDITREC    0x01000000 /* Audit record pending on thread */
  462 #define TDP_RFPPWAIT    0x02000000 /* Handle RFPPWAIT on syscall exit */
  463 #define TDP_RESETSPUR   0x04000000 /* Reset spurious page fault history. */
  464 #define TDP_NERRNO      0x08000000 /* Last errno is already in td_errno */
  465 #define TDP_UIOHELD     0x10000000 /* Current uio has pages held in td_ma */
  466 #define TDP_FORKING     0x20000000 /* Thread is being created through fork() */
  467 #define TDP_EXECVMSPC   0x40000000 /* Execve destroyed old vmspace */
  468 
  469 /*
  470  * Reasons that the current thread can not be run yet.
  471  * More than one may apply.
  472  */
  473 #define TDI_SUSPENDED   0x0001  /* On suspension queue. */
  474 #define TDI_SLEEPING    0x0002  /* Actually asleep! (tricky). */
  475 #define TDI_SWAPPED     0x0004  /* Stack not in mem.  Bad juju if run. */
  476 #define TDI_LOCK        0x0008  /* Stopped on a lock. */
  477 #define TDI_IWAIT       0x0010  /* Awaiting interrupt. */
  478 
  479 #define TD_IS_SLEEPING(td)      ((td)->td_inhibitors & TDI_SLEEPING)
  480 #define TD_ON_SLEEPQ(td)        ((td)->td_wchan != NULL)
  481 #define TD_IS_SUSPENDED(td)     ((td)->td_inhibitors & TDI_SUSPENDED)
  482 #define TD_IS_SWAPPED(td)       ((td)->td_inhibitors & TDI_SWAPPED)
  483 #define TD_ON_LOCK(td)          ((td)->td_inhibitors & TDI_LOCK)
  484 #define TD_AWAITING_INTR(td)    ((td)->td_inhibitors & TDI_IWAIT)
  485 #define TD_IS_RUNNING(td)       ((td)->td_state == TDS_RUNNING)
  486 #define TD_ON_RUNQ(td)          ((td)->td_state == TDS_RUNQ)
  487 #define TD_CAN_RUN(td)          ((td)->td_state == TDS_CAN_RUN)
  488 #define TD_IS_INHIBITED(td)     ((td)->td_state == TDS_INHIBITED)
  489 #define TD_ON_UPILOCK(td)       ((td)->td_flags & TDF_UPIBLOCKED)
  490 #define TD_IS_IDLETHREAD(td)    ((td)->td_flags & TDF_IDLETD)
  491 
  492 #define KTDSTATE(td)                                                    \
  493         (((td)->td_inhibitors & TDI_SLEEPING) != 0 ? "sleep"  :         \
  494         ((td)->td_inhibitors & TDI_SUSPENDED) != 0 ? "suspended" :      \
  495         ((td)->td_inhibitors & TDI_SWAPPED) != 0 ? "swapped" :          \
  496         ((td)->td_inhibitors & TDI_LOCK) != 0 ? "blocked" :             \
  497         ((td)->td_inhibitors & TDI_IWAIT) != 0 ? "iwait" : "yielding")
  498 
  499 #define TD_SET_INHIB(td, inhib) do {                    \
  500         (td)->td_state = TDS_INHIBITED;                 \
  501         (td)->td_inhibitors |= (inhib);                 \
  502 } while (0)
  503 
  504 #define TD_CLR_INHIB(td, inhib) do {                    \
  505         if (((td)->td_inhibitors & (inhib)) &&          \
  506             (((td)->td_inhibitors &= ~(inhib)) == 0))   \
  507                 (td)->td_state = TDS_CAN_RUN;           \
  508 } while (0)
  509 
  510 #define TD_SET_SLEEPING(td)     TD_SET_INHIB((td), TDI_SLEEPING)
  511 #define TD_SET_SWAPPED(td)      TD_SET_INHIB((td), TDI_SWAPPED)
  512 #define TD_SET_LOCK(td)         TD_SET_INHIB((td), TDI_LOCK)
  513 #define TD_SET_SUSPENDED(td)    TD_SET_INHIB((td), TDI_SUSPENDED)
  514 #define TD_SET_IWAIT(td)        TD_SET_INHIB((td), TDI_IWAIT)
  515 #define TD_SET_EXITING(td)      TD_SET_INHIB((td), TDI_EXITING)
  516 
  517 #define TD_CLR_SLEEPING(td)     TD_CLR_INHIB((td), TDI_SLEEPING)
  518 #define TD_CLR_SWAPPED(td)      TD_CLR_INHIB((td), TDI_SWAPPED)
  519 #define TD_CLR_LOCK(td)         TD_CLR_INHIB((td), TDI_LOCK)
  520 #define TD_CLR_SUSPENDED(td)    TD_CLR_INHIB((td), TDI_SUSPENDED)
  521 #define TD_CLR_IWAIT(td)        TD_CLR_INHIB((td), TDI_IWAIT)
  522 
  523 #define TD_SET_RUNNING(td)      (td)->td_state = TDS_RUNNING
  524 #define TD_SET_RUNQ(td)         (td)->td_state = TDS_RUNQ
  525 #define TD_SET_CAN_RUN(td)      (td)->td_state = TDS_CAN_RUN
  526 
  527 #define TD_SBDRY_INTR(td) \
  528     (((td)->td_flags & (TDF_SEINTR | TDF_SERESTART)) != 0)
  529 #define TD_SBDRY_ERRNO(td) \
  530     (((td)->td_flags & TDF_SEINTR) != 0 ? EINTR : ERESTART)
  531 
  532 /*
  533  * Process structure.
  534  */
  535 struct proc {
  536         LIST_ENTRY(proc) p_list;        /* (d) List of all processes. */
  537         TAILQ_HEAD(, thread) p_threads; /* (c) all threads. */
  538         struct mtx      p_slock;        /* process spin lock */
  539         struct ucred    *p_ucred;       /* (c) Process owner's identity. */
  540         struct filedesc *p_fd;          /* (b) Open files. */
  541         struct filedesc_to_leader *p_fdtol; /* (b) Tracking node */
  542         struct pstats   *p_stats;       /* (b) Accounting/statistics (CPU). */
  543         struct plimit   *p_limit;       /* (c) Resource limits. */
  544         struct callout  p_limco;        /* (c) Limit callout handle */
  545         struct sigacts  *p_sigacts;     /* (x) Signal actions, state (CPU). */
  546 
  547         int             p_flag;         /* (c) P_* flags. */
  548         int             p_flag2;        /* (c) P2_* flags. */
  549         enum {
  550                 PRS_NEW = 0,            /* In creation */
  551                 PRS_NORMAL,             /* threads can be run. */
  552                 PRS_ZOMBIE
  553         } p_state;                      /* (j/c) Process status. */
  554         pid_t           p_pid;          /* (b) Process identifier. */
  555         LIST_ENTRY(proc) p_hash;        /* (d) Hash chain. */
  556         LIST_ENTRY(proc) p_pglist;      /* (g + e) List of processes in pgrp. */
  557         struct proc     *p_pptr;        /* (c + e) Pointer to parent process. */
  558         LIST_ENTRY(proc) p_sibling;     /* (e) List of sibling processes. */
  559         LIST_HEAD(, proc) p_children;   /* (e) Pointer to list of children. */
  560         struct proc     *p_reaper;      /* (e) My reaper. */
  561         LIST_HEAD(, proc) p_reaplist;   /* (e) List of my descendants
  562                                                (if I am reaper). */
  563         LIST_ENTRY(proc) p_reapsibling; /* (e) List of siblings - descendants of
  564                                                the same reaper. */
  565         struct mtx      p_mtx;          /* (n) Lock for this struct. */
  566         struct mtx      p_statmtx;      /* Lock for the stats */
  567         struct mtx      p_itimmtx;      /* Lock for the virt/prof timers */
  568         struct mtx      p_profmtx;      /* Lock for the profiling */
  569         struct ksiginfo *p_ksi; /* Locked by parent proc lock */
  570         uint64_t        padding1[4];
  571         void            *padding2[4];
  572 
  573 /* The following fields are all zeroed upon creation in fork. */
  574 #define p_startzero     p_oppid
  575         pid_t           p_oppid;        /* (c + e) Save ppid in ptrace. XXX */
  576         struct vmspace  *p_vmspace;     /* (b) Address space. */
  577         u_int           p_swtick;       /* (c) Tick when swapped in or out. */
  578         u_int           p_cowgen;       /* (c) Generation of COW pointers. */
  579         struct itimerval p_realtimer;   /* (c) Alarm timer. */
  580         struct rusage   p_ru;           /* (a) Exit information. */
  581         struct rusage_ext p_rux;        /* (cu) Internal resource usage. */
  582         struct rusage_ext p_crux;       /* (c) Internal child resource usage. */
  583         int             p_profthreads;  /* (c) Num threads in addupc_task. */
  584         volatile int    p_exitthreads;  /* (j) Number of threads exiting */
  585         int             p_traceflag;    /* (o) Kernel trace points. */
  586         struct vnode    *p_tracevp;     /* (c + o) Trace to vnode. */
  587         struct ucred    *p_tracecred;   /* (o) Credentials to trace with. */
  588         struct vnode    *p_textvp;      /* (b) Vnode of executable. */
  589         u_int           p_lock;         /* (c) Proclock (prevent swap) count. */
  590         struct sigiolst p_sigiolst;     /* (c) List of sigio sources. */
  591         int             p_sigparent;    /* (c) Signal to parent on exit. */
  592         int             p_sig;          /* (n) For core dump/debugger XXX. */
  593         u_long          p_code;         /* (n) For core dump/debugger XXX. */
  594         u_int           p_stops;        /* (c) Stop event bitmask. */
  595         u_int           p_stype;        /* (c) Stop event type. */
  596         char            p_step;         /* (c) Process is stopped. */
  597         u_char          p_pfsflags;     /* (c) Procfs flags. */
  598         struct nlminfo  *p_nlminfo;     /* (?) Only used by/for lockd. */
  599         struct kaioinfo *p_aioinfo;     /* (y) ASYNC I/O info. */
  600         struct thread   *p_singlethread;/* (c + j) If single threading this is it */
  601         int             p_suspcount;    /* (j) Num threads in suspended mode. */
  602         struct thread   *p_xthread;     /* (c) Trap thread */
  603         int             p_boundary_count;/* (j) Num threads at user boundary */
  604         int             p_pendingcnt;   /* how many signals are pending */
  605         struct itimers  *p_itimers;     /* (c) POSIX interval timers. */
  606         struct procdesc *p_procdesc;    /* (e) Process descriptor, if any. */
  607         u_int           p_treeflag;     /* (e) P_TREE flags */
  608         int             p_pendingexits; /* (c) Count of pending thread exits. */
  609         struct filemon  *p_filemon;     /* (c) filemon-specific data. */
  610 /* End area that is zeroed on creation. */
  611 #define p_endzero       p_magic
  612 
  613 /* The following fields are all copied upon creation in fork. */
  614 #define p_startcopy     p_endzero
  615         u_int           p_magic;        /* (b) Magic number. */
  616         int             p_osrel;        /* (x) osreldate for the
  617                                                binary (from ELF note, if any) */
  618         char            p_comm[MAXCOMLEN + 1];  /* (x) Process name. */
  619         struct sysentvec *p_sysent;     /* (b) Syscall dispatch info. */
  620         struct pargs    *p_args;        /* (c) Process arguments. */
  621         rlim_t          p_cpulimit;     /* (c) Current CPU limit in seconds. */
  622         signed char     p_nice;         /* (c) Process "nice" value. */
  623         int             p_fibnum;       /* in this routing domain XXX MRT */
  624         pid_t           p_reapsubtree;  /* (e) Pid of the direct child of the
  625                                                reaper which spawned
  626                                                our subtree. */
  627 /* End area that is copied on creation. */
  628 #define p_endcopy       p_xexit
  629 
  630         u_int           p_xexit;        /* (c) Exit code. */
  631         u_int           p_xsig;         /* (c) Stop/kill sig. */
  632         struct pgrp     *p_pgrp;        /* (c + e) Pointer to process group. */
  633         struct knlist   *p_klist;       /* (c) Knotes attached to this proc. */
  634         int             p_numthreads;   /* (c) Number of threads. */
  635         struct mdproc   p_md;           /* Any machine-dependent fields. */
  636         struct callout  p_itcallout;    /* (h + c) Interval timer callout. */
  637         u_short         p_acflag;       /* (c) Accounting flags. */
  638         struct proc     *p_peers;       /* (r) */
  639         struct proc     *p_leader;      /* (b) */
  640         void            *p_emuldata;    /* (c) Emulator state data. */
  641         struct label    *p_label;       /* (*) Proc (not subject) MAC label. */
  642         STAILQ_HEAD(, ktr_request)      p_ktr;  /* (o) KTR event queue. */
  643         LIST_HEAD(, mqueue_notifier)    p_mqnotifier; /* (c) mqueue notifiers.*/
  644         struct kdtrace_proc     *p_dtrace; /* (*) DTrace-specific data. */
  645         struct cv       p_pwait;        /* (*) wait cv for exit/exec. */
  646         struct cv       p_dbgwait;      /* (*) wait cv for debugger attach
  647                                            after fork. */
  648         uint64_t        p_prev_runtime; /* (c) Resource usage accounting. */
  649         struct racct    *p_racct;       /* (b) Resource accounting. */
  650         int             p_throttled;    /* (c) Flag for racct pcpu throttling */
  651         struct vm_domain_policy p_vm_dom_policy;        /* (c) process default VM domain, or -1 */
  652         /*
  653          * An orphan is the child that has beed re-parented to the
  654          * debugger as a result of attaching to it.  Need to keep
  655          * track of them for parent to be able to collect the exit
  656          * status of what used to be children.
  657          */
  658         LIST_ENTRY(proc) p_orphan;      /* (e) List of orphan processes. */
  659         LIST_HEAD(, proc) p_orphans;    /* (e) Pointer to list of orphans. */
  660         u_int           p_ptevents;     /* (c) ptrace() event mask. */
  661         uint16_t        p_elf_machine;  /* (x) ELF machine type */
  662         uint64_t        p_elf_flags;    /* (x) ELF flags */
  663         sigqueue_t      p_sigqueue;     /* (c) Sigs not delivered to a td. */
  664 #define p_siglist       p_sigqueue.sq_signals
  665 };
  666 
  667 #define p_session       p_pgrp->pg_session
  668 #define p_pgid          p_pgrp->pg_id
  669 
  670 #define NOCPU           (-1)    /* For when we aren't on a CPU. */
  671 #define NOCPU_OLD       (255)
  672 #define MAXCPU_OLD      (254)
  673 
  674 #define PROC_SLOCK(p)   mtx_lock_spin(&(p)->p_slock)
  675 #define PROC_SUNLOCK(p) mtx_unlock_spin(&(p)->p_slock)
  676 #define PROC_SLOCK_ASSERT(p, type)      mtx_assert(&(p)->p_slock, (type))
  677 
  678 #define PROC_STATLOCK(p)        mtx_lock_spin(&(p)->p_statmtx)
  679 #define PROC_STATUNLOCK(p)      mtx_unlock_spin(&(p)->p_statmtx)
  680 #define PROC_STATLOCK_ASSERT(p, type)   mtx_assert(&(p)->p_statmtx, (type))
  681 
  682 #define PROC_ITIMLOCK(p)        mtx_lock_spin(&(p)->p_itimmtx)
  683 #define PROC_ITIMUNLOCK(p)      mtx_unlock_spin(&(p)->p_itimmtx)
  684 #define PROC_ITIMLOCK_ASSERT(p, type)   mtx_assert(&(p)->p_itimmtx, (type))
  685 
  686 #define PROC_PROFLOCK(p)        mtx_lock_spin(&(p)->p_profmtx)
  687 #define PROC_PROFUNLOCK(p)      mtx_unlock_spin(&(p)->p_profmtx)
  688 #define PROC_PROFLOCK_ASSERT(p, type)   mtx_assert(&(p)->p_profmtx, (type))
  689 
  690 /* These flags are kept in p_flag. */
  691 #define P_ADVLOCK       0x00001 /* Process may hold a POSIX advisory lock. */
  692 #define P_CONTROLT      0x00002 /* Has a controlling terminal. */
  693 #define P_KPROC         0x00004 /* Kernel process. */
  694 #define P_UNUSED3       0x00008 /* --available-- */
  695 #define P_PPWAIT        0x00010 /* Parent is waiting for child to exec/exit. */
  696 #define P_PROFIL        0x00020 /* Has started profiling. */
  697 #define P_STOPPROF      0x00040 /* Has thread requesting to stop profiling. */
  698 #define P_HADTHREADS    0x00080 /* Has had threads (no cleanup shortcuts) */
  699 #define P_SUGID         0x00100 /* Had set id privileges since last exec. */
  700 #define P_SYSTEM        0x00200 /* System proc: no sigs, stats or swapping. */
  701 #define P_SINGLE_EXIT   0x00400 /* Threads suspending should exit, not wait. */
  702 #define P_TRACED        0x00800 /* Debugged process being traced. */
  703 #define P_WAITED        0x01000 /* Someone is waiting for us. */
  704 #define P_WEXIT         0x02000 /* Working on exiting. */
  705 #define P_EXEC          0x04000 /* Process called exec. */
  706 #define P_WKILLED       0x08000 /* Killed, go to kernel/user boundary ASAP. */
  707 #define P_CONTINUED     0x10000 /* Proc has continued from a stopped state. */
  708 #define P_STOPPED_SIG   0x20000 /* Stopped due to SIGSTOP/SIGTSTP. */
  709 #define P_STOPPED_TRACE 0x40000 /* Stopped because of tracing. */
  710 #define P_STOPPED_SINGLE 0x80000 /* Only 1 thread can continue (not to user). */
  711 #define P_PROTECTED     0x100000 /* Do not kill on memory overcommit. */
  712 #define P_SIGEVENT      0x200000 /* Process pending signals changed. */
  713 #define P_SINGLE_BOUNDARY 0x400000 /* Threads should suspend at user boundary. */
  714 #define P_HWPMC         0x800000 /* Process is using HWPMCs */
  715 #define P_JAILED        0x1000000 /* Process is in jail. */
  716 #define P_TOTAL_STOP    0x2000000 /* Stopped in stop_all_proc. */
  717 #define P_INEXEC        0x4000000 /* Process is in execve(). */
  718 #define P_STATCHILD     0x8000000 /* Child process stopped or exited. */
  719 #define P_INMEM         0x10000000 /* Loaded into memory. */
  720 #define P_SWAPPINGOUT   0x20000000 /* Process is being swapped out. */
  721 #define P_SWAPPINGIN    0x40000000 /* Process is being swapped in. */
  722 #define P_PPTRACE       0x80000000 /* PT_TRACEME by vforked child. */
  723 
  724 #define P_STOPPED       (P_STOPPED_SIG|P_STOPPED_SINGLE|P_STOPPED_TRACE)
  725 #define P_SHOULDSTOP(p) ((p)->p_flag & P_STOPPED)
  726 #define P_KILLED(p)     ((p)->p_flag & P_WKILLED)
  727 
  728 /* These flags are kept in p_flag2. */
  729 #define P2_INHERIT_PROTECTED 0x00000001 /* New children get P_PROTECTED. */
  730 #define P2_NOTRACE      0x00000002      /* No ptrace(2) attach or coredumps. */
  731 #define P2_NOTRACE_EXEC 0x00000004      /* Keep P2_NOPTRACE on exec(2). */
  732 #define P2_AST_SU       0x00000008      /* Handles SU ast for kthreads. */
  733 #define P2_PTRACE_FSTP  0x00000010 /* SIGSTOP from PT_ATTACH not yet handled. */
  734 #define P2_TRAPCAP      0x00000020      /* SIGTRAP on ENOTCAPABLE */
  735 
  736 /* Flags protected by proctree_lock, kept in p_treeflags. */
  737 #define P_TREE_ORPHANED         0x00000001      /* Reparented, on orphan list */
  738 #define P_TREE_FIRST_ORPHAN     0x00000002      /* First element of orphan
  739                                                    list */
  740 #define P_TREE_REAPER           0x00000004      /* Reaper of subtree */
  741 
  742 /*
  743  * These were process status values (p_stat), now they are only used in
  744  * legacy conversion code.
  745  */
  746 #define SIDL    1               /* Process being created by fork. */
  747 #define SRUN    2               /* Currently runnable. */
  748 #define SSLEEP  3               /* Sleeping on an address. */
  749 #define SSTOP   4               /* Process debugging or suspension. */
  750 #define SZOMB   5               /* Awaiting collection by parent. */
  751 #define SWAIT   6               /* Waiting for interrupt. */
  752 #define SLOCK   7               /* Blocked on a lock. */
  753 
  754 #define P_MAGIC         0xbeefface
  755 
  756 #ifdef _KERNEL
  757 
  758 /* Types and flags for mi_switch(). */
  759 #define SW_TYPE_MASK            0xff    /* First 8 bits are switch type */
  760 #define SWT_NONE                0       /* Unspecified switch. */
  761 #define SWT_PREEMPT             1       /* Switching due to preemption. */
  762 #define SWT_OWEPREEMPT          2       /* Switching due to owepreempt. */
  763 #define SWT_TURNSTILE           3       /* Turnstile contention. */
  764 #define SWT_SLEEPQ              4       /* Sleepq wait. */
  765 #define SWT_SLEEPQTIMO          5       /* Sleepq timeout wait. */
  766 #define SWT_RELINQUISH          6       /* yield call. */
  767 #define SWT_NEEDRESCHED         7       /* NEEDRESCHED was set. */
  768 #define SWT_IDLE                8       /* Switching from the idle thread. */
  769 #define SWT_IWAIT               9       /* Waiting for interrupts. */
  770 #define SWT_SUSPEND             10      /* Thread suspended. */
  771 #define SWT_REMOTEPREEMPT       11      /* Remote processor preempted. */
  772 #define SWT_REMOTEWAKEIDLE      12      /* Remote processor preempted idle. */
  773 #define SWT_COUNT               13      /* Number of switch types. */
  774 /* Flags */
  775 #define SW_VOL          0x0100          /* Voluntary switch. */
  776 #define SW_INVOL        0x0200          /* Involuntary switch. */
  777 #define SW_PREEMPT      0x0400          /* The invol switch is a preemption */
  778 
  779 /* How values for thread_single(). */
  780 #define SINGLE_NO_EXIT  0
  781 #define SINGLE_EXIT     1
  782 #define SINGLE_BOUNDARY 2
  783 #define SINGLE_ALLPROC  3
  784 
  785 #ifdef MALLOC_DECLARE
  786 MALLOC_DECLARE(M_PARGS);
  787 MALLOC_DECLARE(M_PGRP);
  788 MALLOC_DECLARE(M_SESSION);
  789 MALLOC_DECLARE(M_SUBPROC);
  790 #endif
  791 
  792 #define FOREACH_PROC_IN_SYSTEM(p)                                       \
  793         LIST_FOREACH((p), &allproc, p_list)
  794 #define FOREACH_THREAD_IN_PROC(p, td)                                   \
  795         TAILQ_FOREACH((td), &(p)->p_threads, td_plist)
  796 
  797 #define FIRST_THREAD_IN_PROC(p) TAILQ_FIRST(&(p)->p_threads)
  798 
  799 /*
  800  * We use process IDs <= pid_max <= PID_MAX; PID_MAX + 1 must also fit
  801  * in a pid_t, as it is used to represent "no process group".
  802  */
  803 #define PID_MAX         99999
  804 #define NO_PID          100000
  805 extern pid_t pid_max;
  806 
  807 #define SESS_LEADER(p)  ((p)->p_session->s_leader == (p))
  808 
  809 
  810 #define STOPEVENT(p, e, v) do {                                         \
  811         WITNESS_WARN(WARN_GIANTOK | WARN_SLEEPOK, NULL,                 \
  812             "checking stopevent %d", (e));                              \
  813         if ((p)->p_stops & (e)) {                                       \
  814                 PROC_LOCK(p);                                           \
  815                 stopevent((p), (e), (v));                               \
  816                 PROC_UNLOCK(p);                                         \
  817         }                                                               \
  818 } while (0)
  819 #define _STOPEVENT(p, e, v) do {                                        \
  820         PROC_LOCK_ASSERT(p, MA_OWNED);                                  \
  821         WITNESS_WARN(WARN_GIANTOK | WARN_SLEEPOK, &p->p_mtx.lock_object, \
  822             "checking stopevent %d", (e));                              \
  823         if ((p)->p_stops & (e))                                         \
  824                 stopevent((p), (e), (v));                               \
  825 } while (0)
  826 
  827 /* Lock and unlock a process. */
  828 #define PROC_LOCK(p)    mtx_lock(&(p)->p_mtx)
  829 #define PROC_TRYLOCK(p) mtx_trylock(&(p)->p_mtx)
  830 #define PROC_UNLOCK(p)  mtx_unlock(&(p)->p_mtx)
  831 #define PROC_LOCKED(p)  mtx_owned(&(p)->p_mtx)
  832 #define PROC_LOCK_ASSERT(p, type)       mtx_assert(&(p)->p_mtx, (type))
  833 
  834 /* Lock and unlock a process group. */
  835 #define PGRP_LOCK(pg)   mtx_lock(&(pg)->pg_mtx)
  836 #define PGRP_UNLOCK(pg) mtx_unlock(&(pg)->pg_mtx)
  837 #define PGRP_LOCKED(pg) mtx_owned(&(pg)->pg_mtx)
  838 #define PGRP_LOCK_ASSERT(pg, type)      mtx_assert(&(pg)->pg_mtx, (type))
  839 
  840 #define PGRP_LOCK_PGSIGNAL(pg) do {                                     \
  841         if ((pg) != NULL)                                               \
  842                 PGRP_LOCK(pg);                                          \
  843 } while (0)
  844 #define PGRP_UNLOCK_PGSIGNAL(pg) do {                                   \
  845         if ((pg) != NULL)                                               \
  846                 PGRP_UNLOCK(pg);                                        \
  847 } while (0)
  848 
  849 /* Lock and unlock a session. */
  850 #define SESS_LOCK(s)    mtx_lock(&(s)->s_mtx)
  851 #define SESS_UNLOCK(s)  mtx_unlock(&(s)->s_mtx)
  852 #define SESS_LOCKED(s)  mtx_owned(&(s)->s_mtx)
  853 #define SESS_LOCK_ASSERT(s, type)       mtx_assert(&(s)->s_mtx, (type))
  854 
  855 /*
  856  * Non-zero p_lock ensures that:
  857  * - exit1() is not performed until p_lock reaches zero;
  858  * - the process' threads stack are not swapped out if they are currently
  859  *   not (P_INMEM).
  860  *
  861  * PHOLD() asserts that the process (except the current process) is
  862  * not exiting, increments p_lock and swaps threads stacks into memory,
  863  * if needed.
  864  * _PHOLD() is same as PHOLD(), it takes the process locked.
  865  * _PHOLD_LITE() also takes the process locked, but comparing with
  866  * _PHOLD(), it only guarantees that exit1() is not executed,
  867  * faultin() is not called.
  868  */
  869 #define PHOLD(p) do {                                                   \
  870         PROC_LOCK(p);                                                   \
  871         _PHOLD(p);                                                      \
  872         PROC_UNLOCK(p);                                                 \
  873 } while (0)
  874 #define _PHOLD(p) do {                                                  \
  875         PROC_LOCK_ASSERT((p), MA_OWNED);                                \
  876         KASSERT(!((p)->p_flag & P_WEXIT) || (p) == curproc,             \
  877             ("PHOLD of exiting process %p", p));                        \
  878         (p)->p_lock++;                                                  \
  879         if (((p)->p_flag & P_INMEM) == 0)                               \
  880                 faultin((p));                                           \
  881 } while (0)
  882 #define _PHOLD_LITE(p) do {                                             \
  883         PROC_LOCK_ASSERT((p), MA_OWNED);                                \
  884         KASSERT(!((p)->p_flag & P_WEXIT) || (p) == curproc,             \
  885             ("PHOLD of exiting process %p", p));                        \
  886         (p)->p_lock++;                                                  \
  887 } while (0)
  888 #define PROC_ASSERT_HELD(p) do {                                        \
  889         KASSERT((p)->p_lock > 0, ("process %p not held", p));           \
  890 } while (0)
  891 
  892 #define PRELE(p) do {                                                   \
  893         PROC_LOCK((p));                                                 \
  894         _PRELE((p));                                                    \
  895         PROC_UNLOCK((p));                                               \
  896 } while (0)
  897 #define _PRELE(p) do {                                                  \
  898         PROC_LOCK_ASSERT((p), MA_OWNED);                                \
  899         PROC_ASSERT_HELD(p);                                            \
  900         (--(p)->p_lock);                                                \
  901         if (((p)->p_flag & P_WEXIT) && (p)->p_lock == 0)                \
  902                 wakeup(&(p)->p_lock);                                   \
  903 } while (0)
  904 #define PROC_ASSERT_NOT_HELD(p) do {                                    \
  905         KASSERT((p)->p_lock == 0, ("process %p held", p));              \
  906 } while (0)
  907 
  908 #define PROC_UPDATE_COW(p) do {                                         \
  909         PROC_LOCK_ASSERT((p), MA_OWNED);                                \
  910         (p)->p_cowgen++;                                                \
  911 } while (0)
  912 
  913 /* Check whether a thread is safe to be swapped out. */
  914 #define thread_safetoswapout(td)        ((td)->td_flags & TDF_CANSWAP)
  915 
  916 /* Control whether or not it is safe for curthread to sleep. */
  917 #define THREAD_NO_SLEEPING()            ((curthread)->td_no_sleeping++)
  918 
  919 #define THREAD_SLEEPING_OK()            ((curthread)->td_no_sleeping--)
  920 
  921 #define THREAD_CAN_SLEEP()              ((curthread)->td_no_sleeping == 0)
  922 
  923 #define PIDHASH(pid)    (&pidhashtbl[(pid) & pidhash])
  924 extern LIST_HEAD(pidhashhead, proc) *pidhashtbl;
  925 extern u_long pidhash;
  926 #define TIDHASH(tid)    (&tidhashtbl[(tid) & tidhash])
  927 extern LIST_HEAD(tidhashhead, thread) *tidhashtbl;
  928 extern u_long tidhash;
  929 extern struct rwlock tidhash_lock;
  930 
  931 #define PGRPHASH(pgid)  (&pgrphashtbl[(pgid) & pgrphash])
  932 extern LIST_HEAD(pgrphashhead, pgrp) *pgrphashtbl;
  933 extern u_long pgrphash;
  934 
  935 extern struct sx allproc_lock;
  936 extern int allproc_gen;
  937 extern struct sx proctree_lock;
  938 extern struct mtx ppeers_lock;
  939 extern struct proc proc0;               /* Process slot for swapper. */
  940 extern struct thread0_storage thread0_st;       /* Primary thread in proc0. */
  941 #define thread0 (thread0_st.t0st_thread)
  942 extern struct vmspace vmspace0;         /* VM space for proc0. */
  943 extern int hogticks;                    /* Limit on kernel cpu hogs. */
  944 extern int lastpid;
  945 extern int nprocs, maxproc;             /* Current and max number of procs. */
  946 extern int maxprocperuid;               /* Max procs per uid. */
  947 extern u_long ps_arg_cache_limit;
  948 
  949 LIST_HEAD(proclist, proc);
  950 TAILQ_HEAD(procqueue, proc);
  951 TAILQ_HEAD(threadqueue, thread);
  952 extern struct proclist allproc;         /* List of all processes. */
  953 extern struct proclist zombproc;        /* List of zombie processes. */
  954 extern struct proc *initproc, *pageproc; /* Process slots for init, pager. */
  955 
  956 extern struct uma_zone *proc_zone;
  957 
  958 struct  proc *pfind(pid_t);             /* Find process by id. */
  959 struct  proc *pfind_locked(pid_t pid);
  960 struct  pgrp *pgfind(pid_t);            /* Find process group by id. */
  961 struct  proc *zpfind(pid_t);            /* Find zombie process by id. */
  962 
  963 struct  fork_req {
  964         int             fr_flags;
  965         int             fr_pages;
  966         int             *fr_pidp;
  967         struct proc     **fr_procp;
  968         int             *fr_pd_fd;
  969         int             fr_pd_flags;
  970         struct filecaps *fr_pd_fcaps;
  971 };
  972 
  973 /*
  974  * pget() flags.
  975  */
  976 #define PGET_HOLD       0x00001 /* Hold the process. */
  977 #define PGET_CANSEE     0x00002 /* Check against p_cansee(). */
  978 #define PGET_CANDEBUG   0x00004 /* Check against p_candebug(). */
  979 #define PGET_ISCURRENT  0x00008 /* Check that the found process is current. */
  980 #define PGET_NOTWEXIT   0x00010 /* Check that the process is not in P_WEXIT. */
  981 #define PGET_NOTINEXEC  0x00020 /* Check that the process is not in P_INEXEC. */
  982 #define PGET_NOTID      0x00040 /* Do not assume tid if pid > PID_MAX. */
  983 
  984 #define PGET_WANTREAD   (PGET_HOLD | PGET_CANDEBUG | PGET_NOTWEXIT)
  985 
  986 int     pget(pid_t pid, int flags, struct proc **pp);
  987 
  988 void    ast(struct trapframe *framep);
  989 struct  thread *choosethread(void);
  990 int     cr_cansignal(struct ucred *cred, struct proc *proc, int signum);
  991 int     enterpgrp(struct proc *p, pid_t pgid, struct pgrp *pgrp,
  992             struct session *sess);
  993 int     enterthispgrp(struct proc *p, struct pgrp *pgrp);
  994 void    faultin(struct proc *p);
  995 void    fixjobc(struct proc *p, struct pgrp *pgrp, int entering);
  996 int     fork1(struct thread *, struct fork_req *);
  997 void    fork_exit(void (*)(void *, struct trapframe *), void *,
  998             struct trapframe *);
  999 void    fork_return(struct thread *, struct trapframe *);
 1000 int     inferior(struct proc *p);
 1001 void    kern_yield(int);
 1002 void    kick_proc0(void);
 1003 void    killjobc(void);
 1004 int     leavepgrp(struct proc *p);
 1005 int     maybe_preempt(struct thread *td);
 1006 void    maybe_yield(void);
 1007 void    mi_switch(int flags, struct thread *newtd);
 1008 int     p_candebug(struct thread *td, struct proc *p);
 1009 int     p_cansee(struct thread *td, struct proc *p);
 1010 int     p_cansched(struct thread *td, struct proc *p);
 1011 int     p_cansignal(struct thread *td, struct proc *p, int signum);
 1012 int     p_canwait(struct thread *td, struct proc *p);
 1013 struct  pargs *pargs_alloc(int len);
 1014 void    pargs_drop(struct pargs *pa);
 1015 void    pargs_hold(struct pargs *pa);
 1016 int     proc_getargv(struct thread *td, struct proc *p, struct sbuf *sb);
 1017 int     proc_getauxv(struct thread *td, struct proc *p, struct sbuf *sb);
 1018 int     proc_getenvv(struct thread *td, struct proc *p, struct sbuf *sb);
 1019 void    procinit(void);
 1020 void    proc_linkup0(struct proc *p, struct thread *td);
 1021 void    proc_linkup(struct proc *p, struct thread *td);
 1022 struct proc *proc_realparent(struct proc *child);
 1023 void    proc_reap(struct thread *td, struct proc *p, int *status, int options);
 1024 void    proc_reparent(struct proc *child, struct proc *newparent);
 1025 void    proc_set_traced(struct proc *p, bool stop);
 1026 struct  pstats *pstats_alloc(void);
 1027 void    pstats_fork(struct pstats *src, struct pstats *dst);
 1028 void    pstats_free(struct pstats *ps);
 1029 void    reaper_abandon_children(struct proc *p, bool exiting);
 1030 int     securelevel_ge(struct ucred *cr, int level);
 1031 int     securelevel_gt(struct ucred *cr, int level);
 1032 void    sess_hold(struct session *);
 1033 void    sess_release(struct session *);
 1034 int     setrunnable(struct thread *);
 1035 void    setsugid(struct proc *p);
 1036 int     should_yield(void);
 1037 int     sigonstack(size_t sp);
 1038 void    stopevent(struct proc *, u_int, u_int);
 1039 struct  thread *tdfind(lwpid_t, pid_t);
 1040 void    threadinit(void);
 1041 void    tidhash_add(struct thread *);
 1042 void    tidhash_remove(struct thread *);
 1043 void    cpu_idle(int);
 1044 int     cpu_idle_wakeup(int);
 1045 extern  void (*cpu_idle_hook)(sbintime_t);      /* Hook to machdep CPU idler. */
 1046 void    cpu_switch(struct thread *, struct thread *, struct mtx *);
 1047 void    cpu_throw(struct thread *, struct thread *) __dead2;
 1048 void    unsleep(struct thread *);
 1049 void    userret(struct thread *, struct trapframe *);
 1050 
 1051 void    cpu_exit(struct thread *);
 1052 void    exit1(struct thread *, int, int) __dead2;
 1053 void    cpu_copy_thread(struct thread *td, struct thread *td0);
 1054 int     cpu_fetch_syscall_args(struct thread *td, struct syscall_args *sa);
 1055 void    cpu_fork(struct thread *, struct proc *, struct thread *, int);
 1056 void    cpu_fork_kthread_handler(struct thread *, void (*)(void *), void *);
 1057 void    cpu_set_syscall_retval(struct thread *, int);
 1058 void    cpu_set_upcall(struct thread *, void (*)(void *), void *,
 1059             stack_t *);
 1060 int     cpu_set_user_tls(struct thread *, void *tls_base);
 1061 void    cpu_thread_alloc(struct thread *);
 1062 void    cpu_thread_clean(struct thread *);
 1063 void    cpu_thread_exit(struct thread *);
 1064 void    cpu_thread_free(struct thread *);
 1065 void    cpu_thread_swapin(struct thread *);
 1066 void    cpu_thread_swapout(struct thread *);
 1067 struct  thread *thread_alloc(int pages);
 1068 int     thread_alloc_stack(struct thread *, int pages);
 1069 void    thread_cow_get_proc(struct thread *newtd, struct proc *p);
 1070 void    thread_cow_get(struct thread *newtd, struct thread *td);
 1071 void    thread_cow_free(struct thread *td);
 1072 void    thread_cow_update(struct thread *td);
 1073 int     thread_create(struct thread *td, struct rtprio *rtp,
 1074             int (*initialize_thread)(struct thread *, void *), void *thunk);
 1075 void    thread_exit(void) __dead2;
 1076 void    thread_free(struct thread *td);
 1077 void    thread_link(struct thread *td, struct proc *p);
 1078 void    thread_reap(void);
 1079 int     thread_single(struct proc *p, int how);
 1080 void    thread_single_end(struct proc *p, int how);
 1081 void    thread_stash(struct thread *td);
 1082 void    thread_stopped(struct proc *p);
 1083 void    childproc_stopped(struct proc *child, int reason);
 1084 void    childproc_continued(struct proc *child);
 1085 void    childproc_exited(struct proc *child);
 1086 int     thread_suspend_check(int how);
 1087 bool    thread_suspend_check_needed(void);
 1088 void    thread_suspend_switch(struct thread *, struct proc *p);
 1089 void    thread_suspend_one(struct thread *td);
 1090 void    thread_unlink(struct thread *td);
 1091 void    thread_unsuspend(struct proc *p);
 1092 void    thread_wait(struct proc *p);
 1093 struct thread   *thread_find(struct proc *p, lwpid_t tid);
 1094 
 1095 void    stop_all_proc(void);
 1096 void    resume_all_proc(void);
 1097 
 1098 static __inline int
 1099 curthread_pflags_set(int flags)
 1100 {
 1101         struct thread *td;
 1102         int save;
 1103 
 1104         td = curthread;
 1105         save = ~flags | (td->td_pflags & flags);
 1106         td->td_pflags |= flags;
 1107         return (save);
 1108 }
 1109 
 1110 static __inline void
 1111 curthread_pflags_restore(int save)
 1112 {
 1113 
 1114         curthread->td_pflags &= save;
 1115 }
 1116 
 1117 static __inline __pure2 struct td_sched *
 1118 td_get_sched(struct thread *td)
 1119 {
 1120 
 1121         return ((struct td_sched *)&td[1]);
 1122 }
 1123 
 1124 extern void (*softdep_ast_cleanup)(struct thread *);
 1125 static __inline void
 1126 td_softdep_cleanup(struct thread *td)
 1127 {
 1128 
 1129         if (td->td_su != NULL && softdep_ast_cleanup != NULL)
 1130                 softdep_ast_cleanup(td);
 1131 }
 1132 
 1133 #endif  /* _KERNEL */
 1134 
 1135 #endif  /* !_SYS_PROC_H_ */

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