winsup/utils/module_info.cc

   1 /* module_info.cc
   2
   3    Copyright 1999 Cygnus Solutions.
   4
   5    Written by Egor Duda <deo@logos-m.ru>
   6
   7 This file is part of Cygwin.
   8
   9 This software is a copyrighted work licensed under the terms of the
  10 Cygwin license.  Please consult the file "CYGWIN_LICENSE" for
  11 details. */
  12
  13 #include <stdlib.h>
  14 #include <windows.h>
  15 #include <psapi.h>
  16
  17 static int psapi_loaded = 0;
  18 static HMODULE psapi_module_handle = NULL;
  19
  20 typedef BOOL WINAPI (tf_EnumProcessModules) (HANDLE, HMODULE *, DWORD,
  21                                              LPDWORD);
  22 typedef BOOL WINAPI (tf_GetModuleInformation) (HANDLE, HMODULE, LPMODULEINFO,
  23                                                DWORD);
  24 typedef DWORD WINAPI (tf_GetModuleFileNameExA) (HANDLE, HMODULE, LPSTR,
  25                                                 DWORD);
  26
  27 static tf_EnumProcessModules *psapi_EnumProcessModules = NULL;
  28 static tf_GetModuleInformation *psapi_GetModuleInformation = NULL;
  29 static tf_GetModuleFileNameExA *psapi_GetModuleFileNameExA = NULL;
  30
  31 /* Returns full name of Dll, which is loaded by hProcess at BaseAddress.
  32    Uses psapi.dll. */
  33
  34 char *
  35 psapi_get_module_name (HANDLE hProcess, DWORD BaseAddress)
  36 {
  37   DWORD len;
  38   MODULEINFO mi;
  39   unsigned int i;
  40   HMODULE dh_buf[1];
  41   HMODULE *DllHandle = dh_buf;
  42   DWORD cbNeeded;
  43   BOOL ok;
  44
  45   char name_buf[MAX_PATH + 1];
  46
  47   if (!psapi_loaded ||
  48       psapi_EnumProcessModules == NULL ||
  49       psapi_GetModuleInformation == NULL ||
  50       psapi_GetModuleFileNameExA == NULL)
  51     {
  52       if (psapi_loaded)
  53         goto failed;
  54       psapi_loaded = 1;
  55       psapi_module_handle = LoadLibrary ("psapi.dll");
  56       if (!psapi_module_handle)
  57         goto failed;
  58       psapi_EnumProcessModules =
  59         (tf_EnumProcessModules *) GetProcAddress (psapi_module_handle,
  60                                                   "EnumProcessModules");
  61       psapi_GetModuleInformation =
  62         (tf_GetModuleInformation *) GetProcAddress (psapi_module_handle,
  63                                                     "GetModuleInformation");
  64       psapi_GetModuleFileNameExA =
  65         (tf_GetModuleFileNameExA *) GetProcAddress (psapi_module_handle,
  66                                                     "GetModuleFileNameExA");
  67       if (psapi_EnumProcessModules == NULL
  68           || psapi_GetModuleInformation == NULL
  69           || psapi_GetModuleFileNameExA == NULL)
  70         goto failed;
  71     }
  72
  73   ok = (*psapi_EnumProcessModules) (hProcess,
  74                                     DllHandle, sizeof (HMODULE), &cbNeeded);
  75
  76   if (!ok || !cbNeeded)
  77     goto failed;
  78   DllHandle = (HMODULE *) malloc (cbNeeded);
  79   if (!DllHandle)
  80     goto failed;
  81   ok = (*psapi_EnumProcessModules) (hProcess, DllHandle, cbNeeded, &cbNeeded);
  82   if (!ok)
  83     {
  84       free (DllHandle);
  85       goto failed;
  86     }
  87
  88   for (i = 0; i < cbNeeded / sizeof (HMODULE); i++)
  89     {
  90       if (!(*psapi_GetModuleInformation) (hProcess,
  91                                           DllHandle[i], &mi, sizeof (mi)))
  92         {
  93           free (DllHandle);
  94           goto failed;
  95         }
  96
  97       len = (*psapi_GetModuleFileNameExA) (hProcess,
  98                                            DllHandle[i], name_buf, MAX_PATH);
  99       if (len == 0)
 100         {
 101           free (DllHandle);
 102           goto failed;
 103         }
 104
 105       if ((DWORD) (mi.lpBaseOfDll) == BaseAddress)
 106         {
 107           free (DllHandle);
 108           return strdup (name_buf);
 109         }
 110     }
 111
 112 failed:
 113   return NULL;
 114 }