bsd/dev/chud/chud_process.c

   1 /*
   2  * Copyright (c) 2003 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_OSREFERENCE_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
  10  * License may not be used to create, or enable the creation or
  11  * redistribution of, unlawful or unlicensed copies of an Apple operating
  12  * system, or to circumvent, violate, or enable the circumvention or
  13  * violation of, any terms of an Apple operating system software license
  14  * agreement.
  15  *
  16  * Please obtain a copy of the License at
  17  * http://www.opensource.apple.com/apsl/ and read it before using this
  18  * file.
  19  *
  20  * The Original Code and all software distributed under the License are
  21  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  22  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  23  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  24  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  25  * Please see the License for the specific language governing rights and
  26  * limitations under the License.
  27  *
  28  * @APPLE_LICENSE_OSREFERENCE_HEADER_END@
  29  */
  30
  31 #include <sys/systm.h>
  32 #include <sys/proc_internal.h>
  33 #include <sys/vnode_internal.h> // vn_getpath()
  34 #include <kern/task.h>
  35 #include <sys/user.h>
  36
  37 int     chudxnu_pid_for_task(task_t task);
  38 task_t  chudxnu_task_for_pid(int pid);
  39 int     chudxnu_current_pid(void);
  40
  41 __private_extern__ int
  42 chudxnu_pid_for_task(task_t task)
  43 {
  44     struct proc *p;
  45
  46     if(task!=TASK_NULL) {
  47         p = (struct proc *)(get_bsdtask_info(task));
  48         if(p) {
  49             return (p->p_pid);
  50         }
  51     }
  52     return -1;
  53 }
  54
  55 __private_extern__ task_t
  56 chudxnu_task_for_pid(int pid)
  57 {
  58     struct proc *p = pfind(pid);
  59     if(p) {
  60         return p->task;
  61     }
  62     return TASK_NULL;
  63 }
  64
  65 __private_extern__ int
  66 chudxnu_current_pid(void)
  67 {
  68     int pid = -1;
  69     struct uthread *ut = get_bsdthread_info(current_thread());
  70     task_t t = current_task();
  71
  72     if(t != TASK_NULL) {
  73         pid = chudxnu_pid_for_task(t);
  74     } else {
  75         // no task, so try looking in the uthread and/or proc
  76         pid = current_proc()->p_pid;
  77
  78         if(ut && ut->uu_proc) {
  79             pid = ut->uu_proc->p_pid;
  80         }
  81     }
  82
  83     return pid;
  84 }