nt/runemacs.c

   1 /*
   2   Simple program to start Emacs with its console window hidden.
   3
   4   This program is provided purely for convenience, since most users will
   5   use Emacs in windowing (GUI) mode, and will not want to have an extra
   6   console window lying around.  */
   7
   8 /*
   9    You may want to define this if you want to be able to install updated
  10    emacs binaries even when other users are using the current version.
  11    The problem with some file servers (notably Novell) is that an open
  12    file cannot be overwritten, deleted, or even renamed.  So if someone
  13    is running emacs.exe already, you cannot install a newer version.
  14    By defining CHOOSE_NEWEST_EXE, you can name your new emacs.exe
  15    something else which matches "emacs*.exe", and runemacs will
  16    automatically select the newest emacs executeable in the bin directory.
  17    (So you'll probably be able to delete the old version some hours/days
  18    later).
  19 */
  20
  21 /* #define CHOOSE_NEWEST_EXE */
  22
  23 #include <windows.h>
  24 #include <string.h>
  25 #include <malloc.h>
  26
  27 int WINAPI
  28 WinMain (HINSTANCE hSelf, HINSTANCE hPrev, LPSTR cmdline, int nShow)
  29 {
  30   STARTUPINFO start;
  31   SECURITY_ATTRIBUTES sec_attrs;
  32   SECURITY_DESCRIPTOR sec_desc;
  33   PROCESS_INFORMATION child;
  34   int wait_for_child = FALSE;
  35   DWORD priority_class = NORMAL_PRIORITY_CLASS;
  36   DWORD ret_code = 0;
  37   char *new_cmdline;
  38   char *p;
  39   char modname[MAX_PATH];
  40
  41   if (!GetModuleFileName (NULL, modname, MAX_PATH))
  42     goto error;
  43   if ((p = strrchr (modname, '\\')) == NULL)
  44     goto error;
  45   *p = 0;
  46
  47   new_cmdline = alloca (MAX_PATH + strlen (cmdline) + 3);
  48   /* Quote executable name in case of spaces in the path. */
  49   *new_cmdline = '"';
  50   strcpy (new_cmdline + 1, modname);
  51
  52 #ifdef CHOOSE_NEWEST_EXE
  53   {
  54     /* Silly hack to allow new versions to be installed on
  55        server even when current version is in use. */
  56
  57     char * best_name = alloca (MAX_PATH + 1);
  58     FILETIME best_time = {0,0};
  59     WIN32_FIND_DATA wfd;
  60     HANDLE fh;
  61     p = new_cmdline + strlen (new_cmdline);
  62     strcpy (p, "\\emacs*.exe\" ");
  63     fh = FindFirstFile (new_cmdline, &wfd);
  64     if (fh == INVALID_HANDLE_VALUE)
  65       goto error;
  66     do
  67       {
  68         if (wfd.ftLastWriteTime.dwHighDateTime > best_time.dwHighDateTime
  69             || (wfd.ftLastWriteTime.dwHighDateTime == best_time.dwHighDateTime
  70                 && wfd.ftLastWriteTime.dwLowDateTime > best_time.dwLowDateTime))
  71           {
  72             best_time = wfd.ftLastWriteTime;
  73             strcpy (best_name, wfd.cFileName);
  74           }
  75       }
  76     while (FindNextFile (fh, &wfd));
  77     FindClose (fh);
  78     *p++ = '\\';
  79     strcpy (p, best_name);
  80     strcat (p, " ");
  81   }
  82 #else
  83   strcat (new_cmdline, "\\emacs.exe\" ");
  84 #endif
  85
  86   /* Append original arguments if any; first look for arguments we
  87      recognise (-wait, -high, and -low), and apply them ourselves.  */
  88   while (cmdline[0] == '-' || cmdline[0] == '/')
  89     {
  90       if (strncmp (cmdline+1, "wait", 4) == 0)
  91         {
  92       wait_for_child = TRUE;
  93       cmdline += 5;
  94     }
  95       else if (strncmp (cmdline+1, "high", 4) == 0)
  96         {
  97           priority_class = HIGH_PRIORITY_CLASS;
  98           cmdline += 5;
  99         }
 100       else if (strncmp (cmdline+1, "low", 3) == 0)
 101         {
 102           priority_class = IDLE_PRIORITY_CLASS;
 103           cmdline += 4;
 104         }
 105       else
 106         break;
 107     }
 108   strcat (new_cmdline, cmdline);
 109
 110   /* Set emacs_dir variable if runemacs was in "%emacs_dir%\bin".  */
 111   if ((p = strrchr (modname, '\\')) && stricmp (p, "\\bin") == 0)
 112     {
 113       *p = 0;
 114       for (p = modname; *p; p++)
 115         if (*p == '\\') *p = '/';
 116       SetEnvironmentVariable ("emacs_dir", modname);
 117     }
 118
 119   memset (&start, 0, sizeof (start));
 120   start.cb = sizeof (start);
 121   start.dwFlags = STARTF_USESHOWWINDOW;
 122   start.wShowWindow = SW_HIDE;
 123
 124   sec_attrs.nLength = sizeof (sec_attrs);
 125   sec_attrs.lpSecurityDescriptor = NULL;
 126   sec_attrs.bInheritHandle = FALSE;
 127
 128   if (CreateProcess (NULL, new_cmdline, &sec_attrs, NULL, TRUE, priority_class,
 129                      GetEnvironmentStrings (), NULL, &start, &child))
 130     {
 131       if (wait_for_child)
 132         {
 133           WaitForSingleObject (child.hProcess, INFINITE);
 134           GetExitCodeProcess (child.hProcess, &ret_code);
 135         }
 136       CloseHandle (child.hThread);
 137       CloseHandle (child.hProcess);
 138     }
 139   else
 140     goto error;
 141   return (int) ret_code;
 142
 143 error:
 144   MessageBox (NULL, "Could not start Emacs.", "Error", MB_ICONSTOP);
 145   return 1;
 146 }