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/procdesc.h

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    1 /*-
    2  * Copyright (c) 2009 Robert N. M. Watson
    3  * All rights reserved.
    4  *
    5  * This software was developed at the University of Cambridge Computer
    6  * Laboratory with support from a grant from Google, Inc.
    7  *
    8  * Redistribution and use in source and binary forms, with or without
    9  * modification, are permitted provided that the following conditions
   10  * are met:
   11  * 1. Redistributions of source code must retain the above copyright
   12  *    notice, this list of conditions and the following disclaimer.
   13  * 2. Redistributions in binary form must reproduce the above copyright
   14  *    notice, this list of conditions and the following disclaimer in the
   15  *    documentation and/or other materials provided with the distribution.
   16  *
   17  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   27  * SUCH DAMAGE.
   28  *
   29  * $FreeBSD: releng/10.2/sys/sys/procdesc.h 269619 2014-08-06 00:35:32Z emaste $
   30  */
   31 
   32 #ifndef _SYS_PROCDESC_H_
   33 #define _SYS_PROCDESC_H_
   34 
   35 #ifdef _KERNEL
   36 #include <sys/selinfo.h>        /* struct selinfo */
   37 #include <sys/_lock.h>
   38 #include <sys/_mutex.h>
   39 
   40 /*-
   41  * struct procdesc describes a process descriptor, and essentially consists
   42  * of two pointers -- one to the file descriptor, and one to the process.
   43  * When both become NULL, the process descriptor will be freed.  An important
   44  * invariant is that there is only ever one process descriptor for a process,
   45  * so a single file pointer will suffice.
   46  *
   47  * Locking key:
   48  * (c) - Constant after initial setup.
   49  * (p) - Protected by the process descriptor mutex.
   50  * (r) - Atomic reference count.
   51  * (s) - Protected by selinfo.
   52  * (t) - Protected by the proctree_lock
   53  */
   54 struct proc;
   55 struct sigio;
   56 struct procdesc {
   57         /*
   58          * Basic process descriptor state: the process, a cache of its pid to
   59          * satisfy queries after the process exits, and process descriptor
   60          * refcount.
   61          */
   62         struct proc     *pd_proc;               /* (t) Process. */
   63         pid_t            pd_pid;                /* (c) Cached pid. */
   64         u_int            pd_refcount;           /* (r) Reference count. */
   65 
   66         /*
   67          * In-flight data and notification of events.
   68          */
   69         int              pd_flags;              /* (p) PD_ flags. */
   70         struct selinfo   pd_selinfo;            /* (p) Event notification. */
   71         struct mtx       pd_lock;               /* Protect data + events. */
   72 };
   73 
   74 /*
   75  * Locking macros for the procdesc itself.
   76  */
   77 #define PROCDESC_LOCK_DESTROY(pd)       mtx_destroy(&(pd)->pd_lock)
   78 #define PROCDESC_LOCK_INIT(pd)  mtx_init(&(pd)->pd_lock, "procdesc", NULL, \
   79                                     MTX_DEF)
   80 #define PROCDESC_LOCK(pd)       mtx_lock(&(pd)->pd_lock)
   81 #define PROCDESC_UNLOCK(pd)     mtx_unlock(&(pd)->pd_lock)
   82 
   83 /*
   84  * Flags for the pd_flags field.
   85  */
   86 #define PDF_CLOSED      0x00000001      /* Descriptor has closed. */
   87 #define PDF_SELECTED    0x00000002      /* Issue selwakeup(). */
   88 #define PDF_EXITED      0x00000004      /* Process exited. */
   89 #define PDF_DAEMON      0x00000008      /* Don't exit when procdesc closes. */
   90 
   91 /*
   92  * In-kernel interfaces to process descriptors.
   93  */
   94 int      procdesc_exit(struct proc *);
   95 int      procdesc_find(struct thread *, int fd, cap_rights_t *, struct proc **);
   96 int      kern_pdgetpid(struct thread *, int fd, cap_rights_t *, pid_t *pidp);
   97 void     procdesc_new(struct proc *, int);
   98 void     procdesc_finit(struct procdesc *, struct file *);
   99 pid_t    procdesc_pid(struct file *);
  100 void     procdesc_reap(struct proc *);
  101 
  102 #else /* !_KERNEL */
  103 
  104 /*
  105  * Process descriptor system calls.
  106  */
  107 struct rusage;
  108 int      pdfork(int *, int);
  109 int      pdkill(int, int);
  110 int      pdgetpid(int, pid_t *);
  111 
  112 #endif /* _KERNEL */
  113 
  114 /*
  115  * Flags which can be passed to pdfork(2).
  116  */
  117 #define PD_DAEMON       0x00000001      /* Don't exit when procdesc closes. */
  118 
  119 #endif /* !_SYS_PROCDESC_H_ */

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