juce/source/src/native/linux/juce_linux_Threads.cpp

   1 /*
   2   ==============================================================================
   3
   4    This file is part of the JUCE library - "Jules' Utility Class Extensions"
   5    Copyright 2004-11 by Raw Material Software Ltd.
   6
   7   ------------------------------------------------------------------------------
   8
   9    JUCE can be redistributed and/or modified under the terms of the GNU General
  10    Public License (Version 2), as published by the Free Software Foundation.
  11    A copy of the license is included in the JUCE distribution, or can be found
  12    online at www.gnu.org/licenses.
  13
  14    JUCE is distributed in the hope that it will be useful, but WITHOUT ANY
  15    WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
  16    A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
  17
  18   ------------------------------------------------------------------------------
  19
  20    To release a closed-source product which uses JUCE, commercial licenses are
  21    available: visit www.rawmaterialsoftware.com/juce for more information.
  22
  23   ==============================================================================
  24 */
  25
  26 // (This file gets included by juce_linux_NativeCode.cpp, rather than being
  27 // compiled on its own).
  28 #if JUCE_INCLUDED_FILE
  29
  30 /*
  31     Note that a lot of methods that you'd expect to find in this file actually
  32     live in juce_posix_SharedCode.h!
  33 */
  34
  35 //==============================================================================
  36 // sets the process to 0=low priority, 1=normal, 2=high, 3=realtime
  37 void Process::setPriority (ProcessPriority prior)
  38 {
  39     struct sched_param param;
  40     int policy, maxp, minp;
  41
  42     const int p = (int) prior;
  43
  44     if (p <= 1)
  45         policy = SCHED_OTHER;
  46     else
  47         policy = SCHED_RR;
  48
  49     minp = sched_get_priority_min (policy);
  50     maxp = sched_get_priority_max (policy);
  51
  52     if (p < 2)
  53         param.sched_priority = 0;
  54     else if (p == 2 )
  55         // Set to middle of lower realtime priority range
  56         param.sched_priority = minp + (maxp - minp) / 4;
  57     else
  58         // Set to middle of higher realtime priority range
  59         param.sched_priority = minp + (3 * (maxp - minp) / 4);
  60
  61     pthread_setschedparam (pthread_self(), policy, &param);
  62 }
  63
  64 void Process::terminate()
  65 {
  66     exit (0);
  67 }
  68
  69 JUCE_API bool JUCE_CALLTYPE juce_isRunningUnderDebugger()
  70 {
  71     static char testResult = 0;
  72
  73     if (testResult == 0)
  74     {
  75         testResult = (char) ptrace (PT_TRACE_ME, 0, 0, 0);
  76
  77         if (testResult >= 0)
  78         {
  79             ptrace (PT_DETACH, 0, (caddr_t) 1, 0);
  80             testResult = 1;
  81         }
  82     }
  83
  84     return testResult < 0;
  85 }
  86
  87 JUCE_API bool JUCE_CALLTYPE Process::isRunningUnderDebugger()
  88 {
  89     return juce_isRunningUnderDebugger();
  90 }
  91
  92 void Process::raisePrivilege()
  93 {
  94     // If running suid root, change effective user
  95     // to root
  96     if (geteuid() != 0 && getuid() == 0)
  97     {
  98         setreuid (geteuid(), getuid());
  99         setregid (getegid(), getgid());
 100     }
 101 }
 102
 103 void Process::lowerPrivilege()
 104 {
 105     // If runing suid root, change effective user
 106     // back to real user
 107     if (geteuid() == 0 && getuid() != 0)
 108     {
 109         setreuid (geteuid(), getuid());
 110         setregid (getegid(), getgid());
 111     }
 112 }
 113
 114 #if ! JUCE_ONLY_BUILD_CORE_LIBRARY
 115
 116 void* PlatformUtilities::loadDynamicLibrary (const String& name)
 117 {
 118     return dlopen (name.toUTF8(), RTLD_LOCAL | RTLD_NOW);
 119 }
 120
 121 void PlatformUtilities::freeDynamicLibrary (void* handle)
 122 {
 123     dlclose(handle);
 124 }
 125
 126 void* PlatformUtilities::getProcedureEntryPoint (void* libraryHandle, const String& procedureName)
 127 {
 128     return dlsym (libraryHandle, procedureName.toUTF8());
 129 }
 130
 131 #endif
 132
 133 #endif