FreeBSD/Linux Kernel Cross Reference
sys/sys/resourcevar.h

     /*-
      * SPDX-License-Identifier: BSD-3-Clause
      *
      * Copyright (c) 1991, 1993
      *      The Regents of the University of California.  All rights reserved.
      *
      * Redistribution and use in source and binary forms, with or without
      * modification, are permitted provided that the following conditions
      * are met:
     * 1. Redistributions of source code must retain the above copyright
     *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     * 3. Neither the name of the University nor the names of its contributors
     *    may be used to endorse or promote products derived from this software
     *    without specific prior written permission.
     *
     * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     * SUCH DAMAGE.
     *
     *      @(#)resourcevar.h       8.4 (Berkeley) 1/9/95
     * $FreeBSD$
     */
    
    #ifndef _SYS_RESOURCEVAR_H_
    #define _SYS_RESOURCEVAR_H_
    
    #include <sys/resource.h>
    #include <sys/queue.h>
    #ifdef _KERNEL
    #include <sys/_lock.h>
    #include <sys/_mutex.h>
    #endif
    
    /*
     * Kernel per-process accounting / statistics
     * (not necessarily resident except when running).
     *
     * Locking key:
     *      b - created at fork, never changes
     *      c - locked by proc mtx
     *      k - only accessed by curthread
     *      w - locked by proc itim lock
     *      w2 - locked by proc prof lock
     */
    struct pstats {
    #define pstat_startzero p_cru
            struct  rusage p_cru;           /* Stats for reaped children. */
            struct  itimerval p_timer[3];   /* (w) Virtual-time timers. */
    #define pstat_endzero   pstat_startcopy
    
    #define pstat_startcopy p_prof
            struct uprof {                  /* Profile arguments. */
                    caddr_t pr_base;        /* (c + w2) Buffer base. */
                    u_long  pr_size;        /* (c + w2) Buffer size. */
                    u_long  pr_off;         /* (c + w2) PC offset. */
                    u_long  pr_scale;       /* (c + w2) PC scaling. */
            } p_prof;
    #define pstat_endcopy   p_start
            struct  timeval p_start;        /* (b) Starting time. */
    };
    
    #ifdef _KERNEL
    
    /*
     * Kernel shareable process resource limits.  Because this structure
     * is moderately large but changes infrequently, it is normally
     * shared copy-on-write after forks.
     */
    struct plimit {
            struct  rlimit pl_rlimit[RLIM_NLIMITS];
            int     pl_refcnt;              /* number of references */
    };
    
    struct racct;
    
    /*-
     * Per uid resource consumption.  This structure is used to track
     * the total resource consumption (process count, socket buffer size,
     * etc) for the uid and impose limits.
     *
     * Locking guide:
     * (a) Constant from inception
     * (b) Lockless, updated using atomics
     * (c) Locked by global uihashtbl_lock
     */
    struct uidinfo {
            LIST_ENTRY(uidinfo) ui_hash;    /* (c) hash chain of uidinfos */
            u_long ui_vmsize;       /* (b) pages of swap reservation by uid */
           long    ui_sbsize;              /* (b) socket buffer space consumed */
           long    ui_proccnt;             /* (b) number of processes */
           long    ui_ptscnt;              /* (b) number of pseudo-terminals */
           long    ui_kqcnt;               /* (b) number of kqueues */
           long    ui_umtxcnt;             /* (b) number of shared umtxs */
           uid_t   ui_uid;                 /* (a) uid */
           u_int   ui_ref;                 /* (b) reference count */
   #ifdef  RACCT
           struct racct *ui_racct;         /* (a) resource accounting */
   #endif
   };
   
   struct proc;
   struct rusage_ext;
   struct thread;
   
   void     addupc_intr(struct thread *td, uintfptr_t pc, u_int ticks);
   void     addupc_task(struct thread *td, uintfptr_t pc, u_int ticks);
   void     calccru(struct proc *p, struct timeval *up, struct timeval *sp);
   void     calcru(struct proc *p, struct timeval *up, struct timeval *sp);
   int      chgkqcnt(struct uidinfo *uip, int diff, rlim_t max);
   int      chgproccnt(struct uidinfo *uip, int diff, rlim_t maxval);
   int      chgsbsize(struct uidinfo *uip, u_int *hiwat, u_int to,
               rlim_t maxval);
   int      chgptscnt(struct uidinfo *uip, int diff, rlim_t maxval);
   int      chgumtxcnt(struct uidinfo *uip, int diff, rlim_t maxval);
   int      kern_proc_setrlimit(struct thread *td, struct proc *p, u_int which,
               struct rlimit *limp);
   struct plimit
           *lim_alloc(void);
   void     lim_copy(struct plimit *dst, struct plimit *src);
   rlim_t   lim_cur(struct thread *td, int which);
   #define lim_cur(td, which)      ({                                      \
           rlim_t _rlim;                                                   \
           struct thread *_td = (td);                                      \
           int _which = (which);                                           \
           if (__builtin_constant_p(which) && which != RLIMIT_DATA &&      \
               which != RLIMIT_STACK && which != RLIMIT_VMEM) {            \
                   _rlim = _td->td_limit->pl_rlimit[_which].rlim_cur;      \
           } else {                                                        \
                   _rlim = lim_cur(_td, _which);                           \
           }                                                               \
           _rlim;                                                          \
   })
   
   rlim_t   lim_cur_proc(struct proc *p, int which);
   void     lim_fork(struct proc *p1, struct proc *p2);
   void     lim_free(struct plimit *limp);
   void     lim_freen(struct plimit *limp, int n);
   struct plimit
           *lim_hold(struct plimit *limp);
   struct plimit
           *lim_cowsync(void);
   rlim_t   lim_max(struct thread *td, int which);
   rlim_t   lim_max_proc(struct proc *p, int which);
   void     lim_rlimit(struct thread *td, int which, struct rlimit *rlp);
   void     lim_rlimit_proc(struct proc *p, int which, struct rlimit *rlp);
   void     ruadd(struct rusage *ru, struct rusage_ext *rux, struct rusage *ru2,
               struct rusage_ext *rux2);
   void     rucollect(struct rusage *ru, struct rusage *ru2);
   void     rufetch(struct proc *p, struct rusage *ru);
   void     rufetchcalc(struct proc *p, struct rusage *ru, struct timeval *up,
               struct timeval *sp);
   void     rufetchtd(struct thread *td, struct rusage *ru);
   void     ruxagg(struct proc *p, struct thread *td);
   void     ruxagg_locked(struct proc *p, struct thread *td);
   struct uidinfo
           *uifind(uid_t uid);
   void     uifree(struct uidinfo *uip);
   void     uihashinit(void);
   void     uihold(struct uidinfo *uip);
   #ifdef  RACCT
   void     ui_racct_foreach(void (*callback)(struct racct *racct,
               void *arg2, void *arg3), void (*pre)(void), void (*post)(void),
               void *arg2, void *arg3);
   #endif
   
   #endif /* _KERNEL */
   #endif /* !_SYS_RESOURCEVAR_H_ */

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