gdb/common/ptid.c

   1 /* The ptid_t type and common functions operating on it.
   2
   3    Copyright (C) 1986-2013 Free Software Foundation, Inc.
   4
   5    This file is part of GDB.
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 3 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  19
  20 #include "ptid.h"
  21
  22 /* Oft used ptids */
  23 ptid_t null_ptid = { 0, 0, 0 };
  24 ptid_t minus_one_ptid = { -1, 0, 0 };
  25
  26 /* Create a ptid given the necessary PID, LWP, and TID components.  */
  27
  28 ptid_t
  29 ptid_build (int pid, long lwp, long tid)
  30 {
  31   ptid_t ptid;
  32
  33   ptid.pid = pid;
  34   ptid.lwp = lwp;
  35   ptid.tid = tid;
  36   return ptid;
  37 }
  38
  39 /* Create a ptid from just a pid.  */
  40
  41 ptid_t
  42 pid_to_ptid (int pid)
  43 {
  44   return ptid_build (pid, 0, 0);
  45 }
  46
  47 /* Fetch the pid (process id) component from a ptid.  */
  48
  49 int
  50 ptid_get_pid (ptid_t ptid)
  51 {
  52   return ptid.pid;
  53 }
  54
  55 /* Fetch the lwp (lightweight process) component from a ptid.  */
  56
  57 long
  58 ptid_get_lwp (ptid_t ptid)
  59 {
  60   return ptid.lwp;
  61 }
  62
  63 /* Fetch the tid (thread id) component from a ptid.  */
  64
  65 long
  66 ptid_get_tid (ptid_t ptid)
  67 {
  68   return ptid.tid;
  69 }
  70
  71 /* ptid_equal() is used to test equality of two ptids.  */
  72
  73 int
  74 ptid_equal (ptid_t ptid1, ptid_t ptid2)
  75 {
  76   return (ptid1.pid == ptid2.pid
  77           && ptid1.lwp == ptid2.lwp
  78           && ptid1.tid == ptid2.tid);
  79 }
  80
  81 /* Returns true if PTID represents a process.  */
  82
  83 int
  84 ptid_is_pid (ptid_t ptid)
  85 {
  86   if (ptid_equal (minus_one_ptid, ptid)
  87       || ptid_equal (null_ptid, ptid))
  88     return 0;
  89
  90   return (ptid_get_lwp (ptid) == 0 && ptid_get_tid (ptid) == 0);
  91 }
  92
  93 /* Returns true if PTID represents a lwp.  */
  94
  95 int
  96 ptid_lwp_p (ptid_t ptid)
  97 {
  98   if (ptid_equal (minus_one_ptid, ptid)
  99       || ptid_equal (null_ptid, ptid))
 100     return 0;
 101
 102   return (ptid_get_lwp (ptid) != 0);
 103 }
 104
 105 /* Returns true if PTID represents a tid.  */
 106
 107 int
 108 ptid_tid_p (ptid_t ptid)
 109 {
 110   if (ptid_equal (minus_one_ptid, ptid)
 111       || ptid_equal (null_ptid, ptid))
 112     return 0;
 113
 114   return (ptid_get_tid (ptid) != 0);
 115 }