programs/taskkill/taskkill.c

   1 /*
   2  * Task termination utility
   3  *
   4  * Copyright 2008 Andrew Riedi
   5  * Copyright 2010 Andrew Nguyen
   6  *
   7  * This library is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU Lesser General Public
   9  * License as published by the Free Software Foundation; either
  10  * version 2.1 of the License, or (at your option) any later version.
  11  *
  12  * This library 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 GNU
  15  * Lesser General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU Lesser General Public
  18  * License along with this library; if not, write to the Free Software
  19  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  20  */
  21
  22 #include <windows.h>
  23 #include <psapi.h>
  24 #include <wine/unicode.h>
  25
  26 #include "taskkill.h"
  27
  28 static int force_termination;
  29
  30 static WCHAR **task_list;
  31 static unsigned int task_count;
  32
  33 struct pid_close_info
  34 {
  35     DWORD pid;
  36     BOOL found;
  37 };
  38
  39 static int taskkill_vprintfW(const WCHAR *msg, __ms_va_list va_args)
  40 {
  41     int wlen;
  42     DWORD count, ret;
  43     WCHAR msg_buffer[8192];
  44
  45     wlen = FormatMessageW(FORMAT_MESSAGE_FROM_STRING, msg, 0, 0, msg_buffer,
  46                           sizeof(msg_buffer)/sizeof(*msg_buffer), &va_args);
  47
  48     ret = WriteConsoleW(GetStdHandle(STD_OUTPUT_HANDLE), msg_buffer, wlen, &count, NULL);
  49     if (!ret)
  50     {
  51         DWORD len;
  52         char *msgA;
  53
  54         /* On Windows WriteConsoleW() fails if the output is redirected. So fall
  55          * back to WriteFile(), assuming the console encoding is still the right
  56          * one in that case.
  57          */
  58         len = WideCharToMultiByte(GetConsoleOutputCP(), 0, msg_buffer, wlen,
  59             NULL, 0, NULL, NULL);
  60         msgA = HeapAlloc(GetProcessHeap(), 0, len);
  61         if (!msgA)
  62             return 0;
  63
  64         WideCharToMultiByte(GetConsoleOutputCP(), 0, msg_buffer, wlen, msgA, len,
  65             NULL, NULL);
  66         WriteFile(GetStdHandle(STD_OUTPUT_HANDLE), msgA, len, &count, FALSE);
  67         HeapFree(GetProcessHeap(), 0, msgA);
  68     }
  69
  70     return count;
  71 }
  72
  73 static int CDECL taskkill_printfW(const WCHAR *msg, ...)
  74 {
  75     __ms_va_list va_args;
  76     int len;
  77
  78     __ms_va_start(va_args, msg);
  79     len = taskkill_vprintfW(msg, va_args);
  80     __ms_va_end(va_args);
  81
  82     return len;
  83 }
  84
  85 static int CDECL taskkill_message_printfW(int msg, ...)
  86 {
  87     __ms_va_list va_args;
  88     WCHAR msg_buffer[8192];
  89     int len;
  90
  91     LoadStringW(GetModuleHandleW(NULL), msg, msg_buffer,
  92         sizeof(msg_buffer)/sizeof(WCHAR));
  93
  94     __ms_va_start(va_args, msg);
  95     len = taskkill_vprintfW(msg_buffer, va_args);
  96     __ms_va_end(va_args);
  97
  98     return len;
  99 }
 100
 101 static int taskkill_message(int msg)
 102 {
 103     static const WCHAR formatW[] = {'%','1',0};
 104     WCHAR msg_buffer[8192];
 105
 106     LoadStringW(GetModuleHandleW(NULL), msg, msg_buffer,
 107         sizeof(msg_buffer)/sizeof(WCHAR));
 108
 109     return taskkill_printfW(formatW, msg_buffer);
 110 }
 111
 112 /* Post WM_CLOSE to all top-level windows belonging to the process with specified PID. */
 113 static BOOL CALLBACK pid_enum_proc(HWND hwnd, LPARAM lParam)
 114 {
 115     struct pid_close_info *info = (struct pid_close_info *)lParam;
 116     DWORD hwnd_pid;
 117
 118     GetWindowThreadProcessId(hwnd, &hwnd_pid);
 119
 120     if (hwnd_pid == info->pid)
 121     {
 122         PostMessageW(hwnd, WM_CLOSE, 0, 0);
 123         info->found = TRUE;
 124     }
 125
 126     return TRUE;
 127 }
 128
 129 static DWORD *enumerate_processes(DWORD *list_count)
 130 {
 131     DWORD *pid_list, alloc_bytes = 1024 * sizeof(*pid_list), needed_bytes;
 132
 133     pid_list = HeapAlloc(GetProcessHeap(), 0, alloc_bytes);
 134     if (!pid_list)
 135         return NULL;
 136
 137     for (;;)
 138     {
 139         DWORD *realloc_list;
 140
 141         if (!EnumProcesses(pid_list, alloc_bytes, &needed_bytes))
 142         {
 143             HeapFree(GetProcessHeap(), 0, pid_list);
 144             return NULL;
 145         }
 146
 147         /* EnumProcesses can't signal an insufficient buffer condition, so the
 148          * only way to possibly determine whether a larger buffer is required
 149          * is to see whether the written number of bytes is the same as the
 150          * buffer size. If so, the buffer will be reallocated to twice the
 151          * size. */
 152         if (alloc_bytes != needed_bytes)
 153             break;
 154
 155         alloc_bytes *= 2;
 156         realloc_list = HeapReAlloc(GetProcessHeap(), 0, pid_list, alloc_bytes);
 157         if (!realloc_list)
 158         {
 159             HeapFree(GetProcessHeap(), 0, pid_list);
 160             return NULL;
 161         }
 162         pid_list = realloc_list;
 163     }
 164
 165     *list_count = needed_bytes / sizeof(*pid_list);
 166     return pid_list;
 167 }
 168
 169 static BOOL get_process_name_from_pid(DWORD pid, WCHAR *buf, DWORD chars)
 170 {
 171     HANDLE process;
 172     HMODULE module;
 173     DWORD required_size;
 174
 175     process = OpenProcess(PROCESS_QUERY_INFORMATION | PROCESS_VM_READ, FALSE, pid);
 176     if (!process)
 177         return FALSE;
 178
 179     if (!EnumProcessModules(process, &module, sizeof(module), &required_size))
 180     {
 181         CloseHandle(process);
 182         return FALSE;
 183     }
 184
 185     if (!GetModuleBaseNameW(process, module, buf, chars))
 186     {
 187         CloseHandle(process);
 188         return FALSE;
 189     }
 190
 191     CloseHandle(process);
 192     return TRUE;
 193 }
 194
 195 /* The implemented task enumeration and termination behavior does not
 196  * exactly match native behavior. On Windows:
 197  *
 198  * In the case of terminating by process name, specifying a particular
 199  * process name more times than the number of running instances causes
 200  * all instances to be terminated, but termination failure messages to
 201  * be printed as many times as the difference between the specification
 202  * quantity and the number of running instances.
 203  *
 204  * Successful terminations are all listed first in order, with failing
 205  * terminations being listed at the end.
 206  *
 207  * A PID of zero causes taskkill to warn about the inability to terminate
 208  * system processes. */
 209 static int send_close_messages(void)
 210 {
 211     DWORD *pid_list, pid_list_size;
 212     DWORD self_pid = GetCurrentProcessId();
 213     unsigned int i;
 214     int status_code = 0;
 215
 216     pid_list = enumerate_processes(&pid_list_size);
 217     if (!pid_list)
 218     {
 219         taskkill_message(STRING_ENUM_FAILED);
 220         return 1;
 221     }
 222
 223     for (i = 0; i < task_count; i++)
 224     {
 225         WCHAR *p = task_list[i];
 226         BOOL is_numeric = TRUE;
 227
 228         /* Determine whether the string is not numeric. */
 229         while (*p)
 230         {
 231             if (!isdigitW(*p++))
 232             {
 233                 is_numeric = FALSE;
 234                 break;
 235             }
 236         }
 237
 238         if (is_numeric)
 239         {
 240             DWORD pid = atoiW(task_list[i]);
 241             struct pid_close_info info = { pid };
 242
 243             if (pid == self_pid)
 244             {
 245                 taskkill_message(STRING_SELF_TERMINATION);
 246                 status_code = 1;
 247                 continue;
 248             }
 249
 250             EnumWindows(pid_enum_proc, (LPARAM)&info);
 251             if (info.found)
 252                 taskkill_message_printfW(STRING_CLOSE_PID_SEARCH, pid);
 253             else
 254             {
 255                 taskkill_message_printfW(STRING_SEARCH_FAILED, task_list[i]);
 256                 status_code = 128;
 257             }
 258         }
 259         else
 260         {
 261             DWORD index;
 262             BOOL found_process = FALSE;
 263
 264             for (index = 0; index < pid_list_size; index++)
 265             {
 266                 WCHAR process_name[MAX_PATH];
 267
 268                 if (get_process_name_from_pid(pid_list[index], process_name, MAX_PATH) &&
 269                     !strcmpiW(process_name, task_list[i]))
 270                 {
 271                     struct pid_close_info info = { pid_list[index] };
 272
 273                     found_process = TRUE;
 274                     if (pid_list[index] == self_pid)
 275                     {
 276                         taskkill_message(STRING_SELF_TERMINATION);
 277                         status_code = 1;
 278                         continue;
 279                     }
 280
 281                     EnumWindows(pid_enum_proc, (LPARAM)&info);
 282                     taskkill_message_printfW(STRING_CLOSE_PROC_SRCH, process_name, pid_list[index]);
 283                 }
 284             }
 285
 286             if (!found_process)
 287             {
 288                 taskkill_message_printfW(STRING_SEARCH_FAILED, task_list[i]);
 289                 status_code = 128;
 290             }
 291         }
 292     }
 293
 294     HeapFree(GetProcessHeap(), 0, pid_list);
 295     return status_code;
 296 }
 297
 298 static int terminate_processes(void)
 299 {
 300     DWORD *pid_list, pid_list_size;
 301     DWORD self_pid = GetCurrentProcessId();
 302     unsigned int i;
 303     int status_code = 0;
 304
 305     pid_list = enumerate_processes(&pid_list_size);
 306     if (!pid_list)
 307     {
 308         taskkill_message(STRING_ENUM_FAILED);
 309         return 1;
 310     }
 311
 312     for (i = 0; i < task_count; i++)
 313     {
 314         WCHAR *p = task_list[i];
 315         BOOL is_numeric = TRUE;
 316
 317         /* Determine whether the string is not numeric. */
 318         while (*p)
 319         {
 320             if (!isdigitW(*p++))
 321             {
 322                 is_numeric = FALSE;
 323                 break;
 324             }
 325         }
 326
 327         if (is_numeric)
 328         {
 329             DWORD pid = atoiW(task_list[i]);
 330             HANDLE process;
 331
 332             if (pid == self_pid)
 333             {
 334                 taskkill_message(STRING_SELF_TERMINATION);
 335                 status_code = 1;
 336                 continue;
 337             }
 338
 339             process = OpenProcess(PROCESS_TERMINATE, FALSE, pid);
 340             if (!process)
 341             {
 342                 taskkill_message_printfW(STRING_SEARCH_FAILED, task_list[i]);
 343                 status_code = 128;
 344                 continue;
 345             }
 346
 347             if (!TerminateProcess(process, 0))
 348             {
 349                 taskkill_message_printfW(STRING_TERMINATE_FAILED, task_list[i]);
 350                 status_code = 1;
 351                 CloseHandle(process);
 352                 continue;
 353             }
 354
 355             taskkill_message_printfW(STRING_TERM_PID_SEARCH, pid);
 356             CloseHandle(process);
 357         }
 358         else
 359         {
 360             DWORD index;
 361             BOOL found_process = FALSE;
 362
 363             for (index = 0; index < pid_list_size; index++)
 364             {
 365                 WCHAR process_name[MAX_PATH];
 366
 367                 if (get_process_name_from_pid(pid_list[index], process_name, MAX_PATH) &&
 368                     !strcmpiW(process_name, task_list[i]))
 369                 {
 370                     HANDLE process;
 371
 372                     if (pid_list[index] == self_pid)
 373                     {
 374                         taskkill_message(STRING_SELF_TERMINATION);
 375                         status_code = 1;
 376                         continue;
 377                     }
 378
 379                     process = OpenProcess(PROCESS_TERMINATE, FALSE, pid_list[index]);
 380                     if (!process)
 381                     {
 382                         taskkill_message_printfW(STRING_SEARCH_FAILED, task_list[i]);
 383                         status_code = 128;
 384                         continue;
 385                     }
 386
 387                     if (!TerminateProcess(process, 0))
 388                     {
 389                         taskkill_message_printfW(STRING_TERMINATE_FAILED, task_list[i]);
 390                         status_code = 1;
 391                         CloseHandle(process);
 392                         continue;
 393                     }
 394
 395                     found_process = TRUE;
 396                     taskkill_message_printfW(STRING_TERM_PROC_SEARCH, task_list[i], pid_list[index]);
 397                     CloseHandle(process);
 398                 }
 399             }
 400
 401             if (!found_process)
 402             {
 403                 taskkill_message_printfW(STRING_SEARCH_FAILED, task_list[i]);
 404                 status_code = 128;
 405             }
 406         }
 407     }
 408
 409     HeapFree(GetProcessHeap(), 0, pid_list);
 410     return status_code;
 411 }
 412
 413 static BOOL add_to_task_list(WCHAR *name)
 414 {
 415     static unsigned int list_size = 16;
 416
 417     if (!task_list)
 418     {
 419         task_list = HeapAlloc(GetProcessHeap(), 0,
 420                                    list_size * sizeof(*task_list));
 421         if (!task_list)
 422             return FALSE;
 423     }
 424     else if (task_count == list_size)
 425     {
 426         void *realloc_list;
 427
 428         list_size *= 2;
 429         realloc_list = HeapReAlloc(GetProcessHeap(), 0, task_list,
 430                                    list_size * sizeof(*task_list));
 431         if (!realloc_list)
 432             return FALSE;
 433
 434         task_list = realloc_list;
 435     }
 436
 437     task_list[task_count++] = name;
 438     return TRUE;
 439 }
 440
 441 /* FIXME Argument processing does not match behavior observed on Windows.
 442  * Stringent argument counting and processing is performed, and unrecognized
 443  * options are detected as parameters when placed after options that accept one. */
 444 static BOOL process_arguments(int argc, WCHAR *argv[])
 445 {
 446     static const WCHAR slashForceTerminate[] = {'/','f',0};
 447     static const WCHAR slashImage[] = {'/','i','m',0};
 448     static const WCHAR slashPID[] = {'/','p','i','d',0};
 449     static const WCHAR slashHelp[] = {'/','?',0};
 450
 451     if (argc > 1)
 452     {
 453         int i;
 454         BOOL has_im = 0, has_pid = 0;
 455
 456         /* Only the lone help option is recognized. */
 457         if (argc == 2 && !strcmpW(slashHelp, argv[1]))
 458         {
 459             taskkill_message(STRING_USAGE);
 460             exit(0);
 461         }
 462
 463         for (i = 1; i < argc; i++)
 464         {
 465             int got_im = 0, got_pid = 0;
 466
 467             if (!strcmpiW(slashForceTerminate, argv[i]))
 468                 force_termination = 1;
 469             /* Options /IM and /PID appear to behave identically, except for
 470              * the fact that they cannot be specified at the same time. */
 471             else if ((got_im = !strcmpiW(slashImage, argv[i])) ||
 472                      (got_pid = !strcmpiW(slashPID, argv[i])))
 473             {
 474                 if (!argv[i + 1])
 475                 {
 476                     taskkill_message_printfW(STRING_MISSING_PARAM, argv[i]);
 477                     taskkill_message(STRING_USAGE);
 478                     return FALSE;
 479                 }
 480
 481                 if (got_im) has_im = 1;
 482                 if (got_pid) has_pid = 1;
 483
 484                 if (has_im && has_pid)
 485                 {
 486                     taskkill_message(STRING_MUTUAL_EXCLUSIVE);
 487                     taskkill_message(STRING_USAGE);
 488                     return FALSE;
 489                 }
 490
 491                 if (!add_to_task_list(argv[i + 1]))
 492                     return FALSE;
 493                 i++;
 494             }
 495             else
 496             {
 497                 taskkill_message(STRING_INVALID_OPTION);
 498                 taskkill_message(STRING_USAGE);
 499                 return FALSE;
 500             }
 501         }
 502     }
 503     else
 504     {
 505         taskkill_message(STRING_MISSING_OPTION);
 506         taskkill_message(STRING_USAGE);
 507         return FALSE;
 508     }
 509
 510     return TRUE;
 511 }
 512
 513 int wmain(int argc, WCHAR *argv[])
 514 {
 515     int status_code = 0;
 516
 517     if (!process_arguments(argc, argv))
 518     {
 519         HeapFree(GetProcessHeap(), 0, task_list);
 520         return 1;
 521     }
 522
 523     if (force_termination)
 524         status_code = terminate_processes();
 525     else
 526         status_code = send_close_messages();
 527
 528     HeapFree(GetProcessHeap(), 0, task_list);
 529     return status_code;
 530 }