bsd/dev/chud/chud_process.c

   1 /*
   2  * Copyright (c) 2003 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
   5  *
   6  * This file contains Original Code and/or Modifications of Original Code
   7  * as defined in and that are subject to the Apple Public Source License
   8  * Version 2.0 (the 'License'). You may not use this file except in
   9  * compliance with the License. The rights granted to you under the License
  10  * may not be used to create, or enable the creation or redistribution of,
  11  * unlawful or unlicensed copies of an Apple operating system, or to
  12  * circumvent, violate, or enable the circumvention or violation of, any
  13  * terms of an Apple operating system software license agreement.
  14  *
  15  * Please obtain a copy of the License at
  16  * http://www.opensource.apple.com/apsl/ and read it before using this file.
  17  *
  18  * The Original Code and all software distributed under the License are
  19  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  20  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  21  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  22  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  23  * Please see the License for the specific language governing rights and
  24  * limitations under the License.
  25  *
  26  * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
  27  */
  28
  29 #include <sys/systm.h>
  30 #include <sys/proc_internal.h>
  31 #include <sys/vnode_internal.h> // vn_getpath()
  32 #include <kern/task.h>
  33 #include <sys/user.h>
  34
  35 int     chudxnu_pid_for_task(task_t task);
  36 task_t  chudxnu_task_for_pid(int pid);
  37 int     chudxnu_current_pid(void);
  38
  39 __private_extern__ int
  40 chudxnu_pid_for_task(task_t task)
  41 {
  42     struct proc *p;
  43
  44     if(task!=TASK_NULL) {
  45         p = (struct proc *)(get_bsdtask_info(task));
  46         if(p) {
  47             return (p->p_pid);
  48         }
  49     }
  50     return -1;
  51 }
  52
  53 __private_extern__ task_t
  54 chudxnu_task_for_pid(int pid)
  55 {
  56     struct proc *p = pfind(pid);
  57     if(p) {
  58         return p->task;
  59     }
  60     return TASK_NULL;
  61 }
  62
  63 __private_extern__ int
  64 chudxnu_current_pid(void)
  65 {
  66     int pid = -1;
  67     struct uthread *ut = get_bsdthread_info(current_thread());
  68     task_t t = current_task();
  69
  70     if(t != TASK_NULL) {
  71         pid = chudxnu_pid_for_task(t);
  72     } else {
  73         // no task, so try looking in the uthread and/or proc
  74         pid = current_proc()->p_pid;
  75
  76         if(ut && ut->uu_proc) {
  77             pid = ut->uu_proc->p_pid;
  78         }
  79     }
  80
  81     return pid;
  82 }