reactos/lib/msvcrt/process/_system.c

   1 /* $Id: _system.c,v 1.6 2002/11/25 17:41:39 robd Exp $
   2  *
   3  * COPYRIGHT:   See COPYING in the top level directory
   4  * PROJECT:     ReactOS system libraries
   5  * FILE:        lib/msvcrt/process/system.c
   6  * PURPOSE:     Excutes a shell command
   7  * PROGRAMER:   Boudewijn Dekker
   8  * UPDATE HISTORY:
   9  *              04/03/99: Created
  10  */
  11 #include <windows.h>
  12 #include <msvcrt/stdlib.h>
  13 #include <msvcrt/string.h>
  14 #include <msvcrt/process.h>
  15 #include <msvcrt/errno.h>
  16 #include <msvcrt/internal/file.h>
  17
  18 int system(const char *command)
  19 {
  20   char *szCmdLine = NULL;
  21   char *szComSpec = NULL;
  22
  23   PROCESS_INFORMATION ProcessInformation;
  24   STARTUPINFO StartupInfo;
  25   char *s;
  26   BOOL result;
  27
  28   int nStatus;
  29
  30   szComSpec = getenv("COMSPEC");
  31
  32 // system should return 0 if command is null and the shell is found
  33
  34   if (command == NULL) {
  35       if (szComSpec == NULL)
  36         return 0;
  37       else
  38       {
  39         free(szComSpec);
  40         return -1;
  41       }
  42     }
  43
  44 // should return 127 or 0 ( MS ) if the shell is not found
  45 // __set_errno(ENOENT);
  46
  47   if (szComSpec == NULL)
  48   {
  49     szComSpec = strdup("cmd.exe");
  50     if (szComSpec == NULL)
  51     {
  52        __set_errno(ENOMEM);
  53        return -1;
  54     }
  55   }
  56
  57   s = max(strchr(szComSpec, '\\'), strchr(szComSpec, '/'));
  58   if (s == NULL)
  59     s = szComSpec;
  60   else
  61     s++;
  62
  63   szCmdLine = malloc(strlen(s) + 4 + strlen(command) + 1);
  64   if (szCmdLine == NULL)
  65   {
  66      free (szComSpec);
  67      __set_errno(ENOMEM);
  68      return -1;
  69   }
  70
  71   strcpy(szCmdLine, s);
  72   s = strrchr(szCmdLine, '.');
  73   if (s)
  74     *s = 0;
  75   strcat(szCmdLine, " /C ");
  76   strcat(szCmdLine, command);
  77
  78 //command file has invalid format ENOEXEC
  79
  80   memset (&StartupInfo, 0, sizeof(STARTUPINFO));
  81   StartupInfo.cb = sizeof(STARTUPINFO);
  82   StartupInfo.lpReserved= NULL;
  83   StartupInfo.dwFlags = 0;
  84   StartupInfo.wShowWindow = SW_SHOWDEFAULT;
  85   StartupInfo.lpReserved2 = NULL;
  86   StartupInfo.cbReserved2 = 0;
  87
  88 // According to ansi standards the new process should ignore  SIGINT and SIGQUIT
  89 // In order to disable ctr-c the process is created with CREATE_NEW_PROCESS_GROUP,
  90 // thus SetConsoleCtrlHandler(NULL,TRUE) is made on behalf of the new process.
  91
  92
  93 //SIGCHILD should be blocked aswell
  94
  95   result = CreateProcessA(szComSpec,
  96                           szCmdLine,
  97                           NULL,
  98                           NULL,
  99                           TRUE,
 100                           0,
 101                           NULL,
 102                           NULL,
 103                           &StartupInfo,
 104                           &ProcessInformation);
 105   free(szCmdLine);
 106   free(szComSpec);
 107
 108   if (result == FALSE)
 109   {
 110      __set_errno(ENOEXEC);
 111      return -1;
 112   }
 113
 114   CloseHandle(ProcessInformation.hThread);
 115
 116 // system should wait untill the calling process is finished
 117   _cwait(&nStatus,(int)ProcessInformation.hProcess,0);
 118   CloseHandle(ProcessInformation.hProcess);
 119
 120   return nStatus;
 121 }